Provided by: libdbix-recordset-perl_0.26-4_all 
NAME
DBIx::Recordset - Perl extension for DBI recordsets
SYNOPSIS
use DBIx::Recordset;
# Setup a new object and select some recods...
*set = DBIx::Recordset -> Search ({'!DataSource' => 'dbi:Oracle:....',
'!Table' => 'users',
'$where' => 'name = ? and age > ?',
'$values' => ['richter', 25] }) ;
# Get the values of field foo ...
print "First Records value of foo is $set[0]{foo}\n" ;
print "Second Records value of foo is $set[1]{foo}\n" ;
# Get the value of the field age of the current record ...
print "Age is $set{age}\n" ;
# Do another select with the already created object...
$set -> Search ({name => 'bar'}) ;
# Show the result...
print "All users with name bar:\n" ;
while ($rec = $set -> Next)
{
print $rec -> {age} ;
}
# Setup another object and insert a new record
*set2 = DBIx::Recordset -> Insert ({'!DataSource' => 'dbi:Oracle:....',
'!Table' => 'users',
'name' => 'foo',
'age' => 25 }) ;
# Update this record (change age from 25 to 99)...
$set -> Update ({age => 99}, {name => 'foo'}) ;
DESCRIPTION
DBIx::Recordset is a perl module for abstraction and simplification of database access.
The goal is to make standard database access (select/insert/update/delete) easier to
handle and independend of the underlying DBMS. Special attention is made on web
applications to make it possible to handle the state-less access and to process the posted
data of formfields, but DBIx::Recordset is not limited to web applications.
DBIx::Recordset uses the DBI API to access the database, so it should work with every
database for which a DBD driver is available (see also DBIx::Compat).
Most public functions take a hash reference as parameter, which makes it simple to supply
various different arguments to the same function. The parameter hash can also be taken
from a hash containing posted formfields like those available with CGI.pm, mod_perl,
HTML::Embperl and others.
Before using a recordset it is necessary to setup an object. Of course the setup step can
be made with the same function call as the first database access, but it can also be
handled separately.
Most functions which set up an object return a typglob. A typglob in Perl is an object
which holds pointers to all datatypes with the same name. Therefore a typglob must always
have a name and can't be declared with my. You can only use it as global variable or
declare it with local. The trick for using a typglob is that setup functions can return a
reference to an object, an array and a hash at the same time.
The object is used to access the object's methods, the array is used to access the records
currently selected in the recordset and the hash is used to access the current record.
If you don't like the idea of using typglobs you can also set up the object, array and
hash separately, or just set the ones you need.
ARGUMENTS
Since most methods take a hash reference as argument, here is a description of the valid
arguments first.
Setup Parameters
All parameters starting with an '!' are only recognized at setup time. If you specify
them in later function calls they will be ignored. You can also preset these parameters
with the TableAttr method of DBIx::Database. This allows you to presetup most parameters
for the whole database and they will be use every time you create a new DBIx::Recordset
object, without specifying it every time.
!DataSource
Specifies the database to which to connect. This information can be given in the
following ways:
Driver/DB/Host.
Same as the first parameter to the DBI connect function.
DBIx::Recordset object
Takes the same database handle as the given DBIx::Recordset object.
DBIx::Database object
Takes Driver/DB/Host from the given database object. See DBIx::Database for
details about DBIx::Database object. When using more then one Recordset object,
this is the most efficient method.
DBIx::Datasbase object name
Takes Driver/DB/Host from the database object which is saved under the given name
($saveas parameter to DBIx::Database -> new)
an DBI database handle
Uses given database handle.
!Table
Tablename. Multiple tables are comma-separated.
!Username
Username. Same as the second parameter to the DBI connect function.
!Password
Password. Same as the third parameter to the DBI connect function.
!DBIAttr
Reference to a hash which holds the attributes for the DBI connect function. See
perldoc DBI for a detailed description.
!Fields
Fields which should be returned by a query. If you have specified multiple tables the
fieldnames should be unique. If the names are not unique you must specify them along
with the tablename (e.g. tab1.field).
NOTE 1: Fieldnames specified with !Fields can't be overridden. If you plan to use
other fields with this object later, use $Fields instead.
NOTE 2: The keys for the returned hash normally don't have a table part. Only the
fieldname part forms the key. (See !LongNames for an exception.)
NOTE 3: Because the query result is returned in a hash, there can only be one out of
multiple fields with the same name fetched at once. If you specify multiple fields
with the same name, only one is returned from a query. Which one this actually is
depends on the DBD driver. (See !LongNames for an exception.)
NOTE 4: Some databases (e.g. mSQL) require you to always qualify a fieldname with a
tablename if more than one table is accessed in one query.
!TableFilter
The TableFilter parameter specifies which tables should be honoured when
DBIx::Recordset searches for links between tables (see below). When given as parameter
to DBIx::Database it filters for which tables DBIx::Database retrieves metadata. Only
thoses tables are used which starts with prefix given by "!TableFilter". Also the
DBIx::Recordset link detection tries to use this value as a prefix of table names, so
you can leave out this prefix when you write a fieldname that should be detected as a
link to another table.
!LongNames
When set to 1, the keys of the hash returned for each record not only consist of the
fieldnames, but are built in the form table.field.
!Order
Fields which should be used for ordering any query. If you have specified multiple
tables the fieldnames should be unique. If the names are not unique you must specify
them among with the tablename (e.g. tab1.field).
NOTE 1: Fieldnames specified with !Order can't be overridden. If you plan to use other
fields with this object later, use $order instead.
!TabRelation
Condition which describes the relation between the given tables (e.g. tab1.id =
tab2.id) (See also !TabJoin.)
Example
'!Table' => 'tab1, tab2',
'!TabRelation' => 'tab1.id=tab2.id',
'name' => 'foo'
This will generate the following SQL statement:
SELECT * FROM tab1, tab2 WHERE name = 'foo' and tab1.id=tab2.id ;
!TabJoin
!TabJoin allows you to specify an INNER/RIGHT/LEFT JOIN which is used in a SELECT
statement. (See also !TabRelation.)
Example
'!Table' => 'tab1, tab2',
'!TabJoin' => 'tab1 LEFT JOIN tab2 ON (tab1.id=tab2.id)',
'name' => 'foo'
This will generate the following SQL statement:
SELECT * FROM tab1 LEFT JOIN tab2 ON (tab1.id=tab2.id) WHERE name =
'foo' ;
!PrimKey
Name of the primary key. When this key appears in a WHERE parameter list (see below),
DBIx::Recordset will ignore all other keys in the list, speeding up WHERE expression
preparation and execution. Note that this key does NOT have to correspond to a field
tagged as PRIMARY KEY in a CREATE TABLE statement.
!Serial
Name of the primary key. In contrast to "!PrimKey" this field is treated as an
autoincrement field. If the database does not support autoincrement fields, but
sequences the field is set to the next value of a sequence (see "!Sequence" and
"!SeqClass") upon each insert. If a "!SeqClass" is given the values are always
retrived from the sequence class regardless if the DBMS supports autoincrement or not.
The value from this field from the last insert could be retrieved by the function
"LastSerial".
!Sequence
Name of the sequence to use for this table when inserting a new record and "!Serial"
is defind. Defaults to <tablename>_seq.
!SeqClass
Name and Parameter for a class that can generate unique sequence values. This is a
string that holds comma separated values. The first value is the class name and the
following parameters are given to the new constructor. See also
DBIx::Recordset::FileSeq and DBIx::Recordset::DBSeq.
Example: '!SeqClass' => 'DBIx::Recordset::FileSeq, /tmp/seq'
!WriteMode
!WriteMode specifies which write operations to the database are allowed and which are
disabled. You may want to set !WriteMode to zero if you only need to query data, to
avoid accidentally changing the content of the database.
NOTE: The !WriteMode only works for the DBIx::Recordset methods. If you disable
!WriteMode, it is still possible to use do to send normal SQL statements to the
database engine to write/delete any data.
!WriteMode consists of some flags, which may be added together:
DBIx::Recordset::wmNONE (0)
Allow no write access to the table(s)
DBIx::Recordset::wmINSERT (1)
Allow INSERT
DBIx::Recordset::wmUPDATE (2)
Allow UPDATE
DBIx::Recordset::wmDELETE (4)
Allow DELETE
DBIx::Recordset::wmCLEAR (8)
To allow DELETE for the whole table, wmDELETE must be also specified. This is
necessary for assigning a hash to a hash which is tied to a table. (Perl will
first erase the whole table, then insert the new data.)
DBIx::Recordset::wmALL (15)
Allow every access to the table(s)
Default is wmINSERT + wmUPDATE + wmDELETE
!StoreAll
If present, this will cause DBIx::Recordset to store all rows which will be fetched
between consecutive accesses, so it's possible to access data in a random order. (e.g.
row 5, 2, 7, 1 etc.) If not specified, rows will only be fetched into memory if
requested, which means that you will have to access rows in ascending order. (e.g.
1,2,3 if you try 3,2,4 you will get an undef for row 2 while 3 and 4 is ok) see also
DATA ACCESS below.
!HashAsRowKey
By default, the hash returned by the setup function is tied to the current record. You
can use it to access the fields of the current record. If you set this parameter to
true, the hash will by tied to the whole database. This means that the key of the hash
will be used as the primary key in the table to select one row. (This parameter only
has an effect on functions which return a typglob.)
!IgnoreEmpty
This parameter defines how empty and undefined values are handled. The values 1 and 2
may be helpful when using DBIx::Recordset inside a CGI script, because browsers send
empty formfields as empty strings.
0 (default)
An undefined value is treated as SQL NULL: an empty string remains an empty
string.
1 All fields with an undefined value are ignored when building the WHERE expression.
2 All fields with an undefined value or an empty string are ignored when building
the WHERE expression.
NOTE: The default for versions before 0.18 was 2.
!Filter
Filters can be used to pre/post-process the data which is read from/written to the
database. The !Filter parameter takes a hash reference which contains the filter
functions. If the key is numeric, it is treated as a type value and the filter is
applied to all fields of that type. If the key if alphanumeric, the filter is applied
to the named field. Every filter description consists of an array with at least two
elements. The first element must contain the input function, and the second element
must contain the output function. Either may be undef, if only one of them are
necessary. The data is passed to the input function before it is written to the
database. The input function must return the value in the correct format for the
database. The output function is applied to data read from the database before it is
returned to the user.
Example:
'!Filter' =>
{
DBI::SQL_DATE =>
[
sub { shift =~ /(\d\d)\.(\d\d)\.(\d\d)/ ; "19$3$2$1"},
sub { shift =~ /\d\d(\d\d)(\d\d)(\d\d)/ ; "$3.$2.$1"}
],
'datefield' =>
[
sub { shift =~ /(\d\d)\.(\d\d)\.(\d\d)/ ; "19$3$2$1"},
sub { shift =~ /\d\d(\d\d)(\d\d)(\d\d)/ ; "$3.$2.$1"}
],
}
Both filters convert a date in the format dd.mm.yy to the database format 19yymmdd and
vice versa. The first one does this for all fields of the type SQL_DATE, the second
one does this for the fields with the name datefield.
The !Filter parameter can also be passed to the function TableAttr of the
DBIx::Database object. In this case it applies to all DBIx::Recordset objects which
use these tables.
A third parameter can be optionally specified. It could be set to
"DBIx::Recordset::rqINSERT", "DBIx::Recordset::rqUPDATE", or the sum of both. If set,
the InputFunction (which is called during UPDATE or INSERT) is always called for this
field in updates and/or inserts depending on the value. If there is no data specified
for this field as an argument to a function which causes an UPDATE/INSERT, the
InputFunction is called with an argument of undef.
During UPDATE and INSERT the input function gets either the string 'insert' or
'update' passed as second parameter.
!LinkName
This allows you to get a clear text description of a linked table, instead of (or in
addition to) the !LinkField. For example, if you have a record with all your bills,
and each record contains a customer number, setting !LinkName DBIx::Recordset can
automatically retrieve the name of the customer instead of (or in addition to) the
bill record itself.
1 select additional fields
This will additionally select all fields given in !NameField of the Link or the
table attributes (see TableAttr).
2 build name in uppercase of !MainField
This takes the values of !NameField of the Link or the table attributes (see
TableAttr) and joins the content of these fields together into a new field, which
has the same name as the !MainField, but in uppercase.
2 replace !MainField with the contents of !NameField
Same as 2, but the !MainField is replaced with "name" of the linked record.
See also !Links and WORKING WITH MULTIPLE TABLES below
!Links
This parameter can be used to link multiple tables together. It takes a reference to a
hash, which has - as keys, names for a special "linkfield" and - as value, a parameter
hash. The parameter hash can contain all the Setup parameters. The setup parameters
are taken to construct a new recordset object to access the linked table. If
!DataSource is omitted (as it normally should be), the same DataSource (and database
handle), as the main object is taken. There are special parameters which can only
occur in a link definition (see next paragraph). For a detailed description of how
links are handled, see WORKING WITH MULTIPLE TABLES below.
Link Parameters
!MainField
The !MailField parameter holds a fieldname which is used to retrieve a key value for
the search in the linked table from the main table. If omitted, it is set to the same
value as !LinkedField.
!LinkedField
The fieldname which holds the key value in the linked table. If omitted, it is set to
the same value as !MainField.
!NameField
This specifies the field or fields which will be used as a "name" for the destination
table. It may be a string or a reference to an array of strings. For example, if you
link to an address table, you may specify the field "nickname" as the name field for
that table, or you may use ['name', 'street', 'city'].
Look at !LinkName for more information.
!DoOnConnect
You can give an SQL Statement (or an array reference of SQL statements), that will be
executed every time, just after an connect to the db. As third possibilty you can give
an hash reference. After every successful connect, DBIx::Recordset excutes the
statements, in the element which corresponds to the name of the driver. '*' is
executed for all drivers.
!Default
Specifies default values for new rows that are inserted via hash or array access. The
Insert method ignores this parameter.
!TieRow
Setting this parameter to zero will cause DBIx::Recordset to not tie the returned rows
to an DBIx::Recordset::Row object and instead returns an simple hash. The benefit of
this is that it will speed up things, but you aren't able to write to such an row, nor
can you use the link feature with such a row.
!Debug
Set the debug level. See DEBUGGING.
!PreFetch
Only for tieing a hash! Gives an where expression (either as string or as hashref)
that is used to prefetch records from that database. All following accesses to the
tied hash only access this prefetched data and don't execute any database queries. See
"!Expires" how to force a refetch. Giving a '*' as value to "!PreFetch" fetches the
whole table into memory.
The following example prefetches all record with id < 7:
tie %dbhash, 'DBIx::Recordset::Hash', {'!DataSource' => $DSN,
'!Username' => $User,
'!Password' => $Password,
'!Table' => 'foo',
'!PreFetch' => {
'*id' => '<',
'id' => 7
},
'!PrimKey' => 'id'} ;
The following example prefetches all records:
tie %dbhash, 'DBIx::Recordset::Hash', {'!DataSource' => $DSN,
'!Username' => $User,
'!Password' => $Password,
'!Table' => 'bar',
'!PreFetch' => '*',
'!PrimKey' => 'id'} ;
!Expires
Only for tieing a hash! If the values is numeric, the prefetched data will be
refetched is it is older then the given number of seconds. If the values is a CODEREF
the function is called and the data is refetched is the function returns true.
!MergeFunc
Only for tieing a hash! Gives an reference to an function that is called when more
then one record for a given hash key is found to merge the records into one. The
function receives a reference to both records a arguments. If more the two records are
found, the function is called again for each following record, which is already merged
data as first parameter.
The following example sets up a hash, that, when more then one record with the same id is
found, the field C<sum> is added and the first record is returned, where the C<sum> field
contains the sum of B<all> found records:
tie %dbhash, 'DBIx::Recordset::Hash', {'!DataSource' => $DSN,
'!Username' => $User,
'!Password' => $Password,
'!Table' => 'bar',
'!MergeFunc' => sub { my ($a, $b) = @_ ; $a->{sum} += $b->{sum} ; },
'!PrimKey' => 'id'} ;
Where Parameters
The following parameters are used to build an SQL WHERE expression
$where
Give an SQL WHERE expression literaly. If $where is specified, all other where
parameters described below are ignored. The only expection is $values which can be
used to give the values to bind to the placeholders in $where
$values
Values which should be bound to the placeholders given in $where.
Example:
*set = DBIx::Recordset -> Search ({'!DataSource' => 'dbi:Oracle:....',
'!Table' => 'users',
'$where' => 'name = ? and age > ?',
'$values' => ['richter', 25] }) ;
NOTE: Filters defined with "!Filter" are not applied to these values, because
DBIx::Recordset has no chance to know with values belongs to which field.
{fieldname}
Value for field. The value will be quoted automatically, if necessary. The value can
also be an array ref in which case the values are put together with the operator
passed via $valueconj (default: or)
Example:
'name' => [ 'mouse', 'cat'] will expand to name='mouse' or name='cat'
'{fieldname}
Value for field. The value will always be quoted. This is only necessary if
DBIx::Recordset cannot determine the correct type for a field.
#{fieldname}
Value for field. The value will never be quoted, but will converted a to number. This
is only necessary if DBIx::Recordset cannot determine the correct type for a field.
\{fieldname}
Value for field. The value will not be converted in any way, i.e. you have to quote it
before supplying it to DBIx::Recordset if necessary.
+{fieldname}|{fieldname}..
Values for multiple fields. The value must be in one/all fields depending on $compconj
Example:
'+name|text' => 'abc' will expand to name='abc' or text='abc'
$compconj
'or' or 'and' (default is 'or'). Specifies the conjunction between multiple fields.
(see above)
$valuesplit
Regular expression for splitting a field value in multiple values (default is '\t')
The conjunction for multiple values could be specified with $valueconj. By default,
only one of the values must match the field.
Example:
'name' => "mouse\tcat" will expand to name='mouse' or name='cat'
NOTE: The above example can also be written as 'name' => [ 'mouse', 'cat']
$valueconj
'or' or 'and' (default is 'or'). Specifies the conjunction for multiple values.
$conj
'or' or 'and' (default is 'and') conjunction between fields
$operator
Default operator if not otherwise specified for a field. (default is '=')
*{fieldname}
Operator for the named field
Example:
'value' => 9, '*value' => '>' expand to value > 9
Could also be an array ref, so you can pass different operators for the values. This
is mainly handy when you need to select a range
Example:
$set -> Search ({id => [5, 7 ],
'*id' => ['>=', '<='],
'$valueconj' => 'and'}) ;
This will expanded to "id >= 5 and id <= 7"
NOTE: To get a range you need to specify the $valueconj parameter as "and" because it
defaults to "or".
$expr
$expr can be used to group parts of the where expression for proper priority. To
specify more the one sub expression, add a numerical index to $expr (e.g. $expr1,
$expr2)
Example:
$set -> Search ({id => 5,
'$expr' =>
{
'name' => 'Richter',
'country' => 'de',
'$conj' => 'or'
}
}) ;
This will expand to
(name = 'Richter' or country = 'de') and id = 5
Search parameters
$start
First row to fetch. The row specified here will appear as index 0 in the data array.
$max
Maximum number of rows to fetch. Every attempt to fetch more rows than specified here
will return undef, even if the select returns more rows.
$next
Add the number supplied with $max to $start. This is intended to implement a next
button.
$prev
Subtract the number supplied with $max from $start. This is intended to implement a
previous button.
$order
Fieldname(s) for ordering (ORDER BY) (must be comma-separated, could also contain
USING)
$group
Fieldname(s) for grouping (GROUP BY) (must be comma-separated, could also contain
HAVING).
$append
String which is appended to the end of a SELECT statement, can contain any data.
$fields
Fields which should be returned by a query. If you have specified multiple tables the
fieldnames should be unique. If the names are not unique you must specify them along
with the tablename (e.g. tab1.field).
NOTE 1: If !fields is supplied at setup time, this can not be overridden by $fields.
NOTE 2: The keys for the returned hash normally don't have a table part. Only the
fieldname part forms the key. (See !LongNames for an exception.)
NOTE 3: Because the query result is returned in a hash, there can only be one out of
multiple fields with the same name fetched at once. If you specify multiple fields
with same name, only one is returned from a query. Which one this actually is, depends
on the DBD driver. (See !LongNames for an exception.)
$primkey
Name of primary key. DBIx::Recordset assumes that if specified, this is a unique key
to the given table(s). DBIx::Recordset can not verify this. You are responsible for
specifying the right key. If such a primary exists in your table, you should specify
it here, because it helps DBIx::Recordset optimize the building of WHERE expressions.
See also !PrimKey
Execute parameters
The following parameters specify which action is to be executed:
=search
search data
=update
update record(s)
=insert
insert record
=delete
delete record(s)
=empty
setup empty object
METHODS
*set = DBIx::Recordset -> Setup (\%params)
Setup a new object and connect it to a database and table(s). Collects information
about the tables which are needed later. Returns a typglob which can be used to access
the object ($set), an array (@set) and a hash (%set).
params: setup
$set = DBIx::Recordset -> SetupObject (\%params)
Same as above, but setup only the object, do not tie anything (no array, no hash)
params: setup
$set = tie @set, 'DBIx::Recordset', $set
$set = tie @set, 'DBIx::Recordset', \%params
Ties an array to a recordset object. The result of a query which is executed by the
returned object can be accessed via the tied array. If the array contents are
modified, the database is updated accordingly (see Data access below for more
details). The first form ties the array to an already existing object, the second one
setup a new object.
params: setup
$set = tie %set, 'DBIx::Recordset::Hash', $set
$set = tie %set, 'DBIx::Recordset::Hash', \%params
Ties a hash to a recordset object. The hash can be used to access/update/insert single
rows of a table: the hash key is identical to the primary key value of the table. (see
Data access below for more details)
The first form ties the hash to an already existing object, the second one sets up a
new object.
params: setup
$set = tie %set, 'DBIx::Recordset::CurrRow', $set
$set = tie %set, 'DBIx::Recordset::CurrRow', \%params
Ties a hash to a recordset object. The hash can be used to access the fields of the
current record of the recordset object. (See Data access below for more details.)
The first form ties the hash to an already existing object, the second one sets up a
new object.
params: setup
*set = DBIx::Recordset -> Select (\%params, $fields, $order)
$set -> Select (\%params, $fields, $order)
$set -> Select ($where, $fields, $order)
Selects records from the recordsets table(s).
The first syntax setups a new DBIx::Recordset object and does the select.
The second and third syntax selects from an existing DBIx::Recordset object.
params: setup (only syntax 1), where (without $order and $fields)
where: (only syntax 3) string for SQL WHERE expression
fields: comma separated list of fieldnames to select
order: comma separated list of fieldnames to sort on
*set = DBIx::Recordset -> Search (\%params)
set -> Search (\%params)
Does a search on the given tables and prepares data to access them via @set or %set.
The first syntax also sets up a new object.
params: setup (only syntax 1), where, search
*set = DBIx::Recordset -> Insert (\%params)
$set -> Insert (\%params)
Inserts a new record in the recordset table(s). Params should contain one entry for
every field for which you want to insert a value.
Fieldnames may be prefixed with a '\' in which case they are not processed (quoted) in
any way.
params: setup (only syntax 1), fields
*set = DBIx::Recordset -> Update (\%params, $where)
*set = DBIx::Recordset -> Update (\%params, $where)
set -> Update (\%params, $where)
set -> Update (\%params, $where)
Updates one or more records in the recordset table(s). Parameters should contain one
entry for every field you want to update. The $where contains the SQL WHERE condition
as a string or as a reference to a hash. If $where is omitted, the where conditions
are buily from the parameters. If !PrimKey is given for the table, only that !PrimKey
is used for the WHERE clause.
Fieldnames may be prefixed with a '\', in which case they are not processed (quoted)
in any way.
params: setup (only syntax 1+2), where (only if $where is omitted), fields
*set = DBIx::Recordset -> Delete (\%params)
$set -> Delete (\%params)
Deletes one or more records from the recordsets table(s).
params: setup (only syntax 1), where
*set = DBIx::Recordset -> DeleteWithLinks (\%params)
$set -> DeleteWithLinks (\%params)
Deletes one or more records from the recordsets table(s). Additonal all record of
links with have the "!OnDelete" set, are either deleted or the correspending field is
set to undef. What to do is determinated by the constants "odDELETE" and "odCLEAR".
This is very helpful to guaratee the inetgrity of the database.
params: setup (only syntax 1), where
*set = DBIx::Recordset -> Execute (\%params)
$set -> Execute (\%params)
Executes one of the above methods, depending on the given arguments. If multiple
execute parameters are specified, the priority is
=search
=update
=insert
=delete
=empty
If none of the above parameters are specified, a search is performed. A search is
always performed. On an "=update", the "!PrimKey", if given, is looked upon and used
for the where part of the SQL statement, while all other parameters are updated.
params: setup (only syntax 1), execute, where, search, fields
$set -> do ($statement, $attribs, \%params)
Same as DBI. Executes a single SQL statement on the open database.
$set -> Reset ()
Set the record pointer to the initial state, so the next call to
"Next" returns the first row.
$set -> First ()
Position the record pointer to the first row and returns it.
$set -> Next ()
Position the record pointer to the next row and returns it.
$set -> Prev ()
Position the record pointer to the previous row and returns it.
$set -> Curr ()
Returns the current row.
$set -> AllNames ()
Returns a reference to an array of all fieldnames of all tables used by the object.
$set -> Names ()
Returns a reference to an array of the fieldnames from the last query.
$set -> AllTypes ()
Returns a reference to an array of all fieldtypes of all tables used by the object.
$set -> Types ()
Returns a reference to an array of the fieldtypes from the last query.
$set -> Add ()
$set -> Add (\%data)
Adds a new row to a recordset. The first one adds an empty row, the second one will
assign initial data to it. The Add method returns an index into the array where the
new record is located.
Example:
# Add an empty record
$i = $set -> Add () ;
# Now assign some data
$set[$i]{id} = 5 ;
$set[$i]{name} = 'test' ;
# and here it is written to the database
# (without Flush it is written, when the record goes out of scope)
$set -> Flush () ;
Add will also set the current record to the newly created empty record. So, you can
assign the data by simply using the current record.
# Add an empty record
$set -> Add () ;
# Now assign some data to the new record
$set{id} = 5 ;
$set{name} = 'test' ;
$set -> MoreRecords ([$ignoremax])
Returns true if there are more records to fetch from the current recordset. If the
$ignoremax parameter is specified and is true, MoreRecords ignores the $max parameter
of the last Search.
To tell you if there are more records, More actually fetches the next record from the
database and stores it in memory. It does not, however, change the current record.
$set -> PrevNextForm ($prevtext, $nexttext, \%fdat)
$set -> PrevNextForm (\%param, \%fdat)
Returns a HTML form which contains a previous and a next button and all data from
%fdat, as hidden fields. When calling the Search method, You must set the $max
parameter to the number of rows you want to see at once. After the search and the
retrieval of the rows, you can call PrevNextForm to generate the needed buttons for
scrolling through the recordset.
The second for allows you the specifies addtional parameter, which creates first,
previous, next, last and goto buttons. Example:
$set -> PrevNextForm ({-first => 'First', -prev => '<<Back',
-next => 'Next>>', -last => 'Last',
-goto => 'Goto #'}, \%fdat)
The goto button lets you jump to an random record number. If you obmit any of the
parameters, the corresponding button will not be shown.
$set -> Flush
The Flush method flushes all data to the database and therefore makes sure that the db
is up-to-date. Normally, DBIx::Recordset holds the update in memory until the row is
destroyed, by either a new Select/Search or by the Recordsetobject itself is
destroyed. With this method you can make sure that every update is really written to
the db.
$set -> Dirty ()
Returns true if there is at least one dirty row containing unflushed data.
DBIx::Recordset::Undef ($name)
Undef takes the name of a typglob and will destroy the array, the hash, and the
object. All unwritten data is written to the db. All db connections are closed and
all memory is freed.
Example:
# this destroys $set, @set and %set
DBIx::Recordset::Undef ('set') ;
$set -> Begin
Starts a transaction. Calls the DBI method begin.
$set -> Rollback
Rolls back a transaction. Calls the DBI method rollback and makes sure that all
internal buffers of DBIx::Recordset are flushed.
$set -> Commit
Commits a transaction. Calls the DBI method commit and makes sure that all internal
buffers of DBIx::Recordset are flushed.
$set -> DBHdl ()
Returns the DBI database handle.
$set -> StHdl ()
Returns the DBI statement handle of the last select.
$set -> TableName ()
Returns the name of the table of the recordset object.
$set -> TableNameWithOutFilter ()
Returns the name of the table of the recordset object, but removes the string given
with !TableFilter, if it is the prefix of the table name.
$set -> PrimKey ()
Returns the primary key given in the !PrimKey parameter.
$set -> TableFilter ()
Returns the table filter given in the !TableFilter parameter.
$set -> StartRecordNo ()
Returns the record number of the record which will be returned for index 0.
$set -> LastSQLStatement ()
Returns the last executed SQL Statement.
$set -> LastSerial ()
Return the last value of the field defined with !Serial
$set -> Disconnect ()
Closes the connection to the database.
$set -> Link($linkname)
If $linkname is undef, returns reference to a hash of all links of the object.
Otherwise, it returns a reference to the link with the given name.
$set -> Links()
Returns reference to a hash of all links of the object.
$set -> Link4Field($fieldname)
Returns the name of the link for that field, or <undef> if there is no link for that
field.
$set -> TableAttr ($key, $value, $table)
get and/or set an attribute of the table
$key
key to set/get
$value
if present, set key to this value
$table
Optional, let you specify another table, then the one use by the recordset object.
$set -> Stats ()
Returns an hash ref with some statistical values.
$set -> LastError ()
DBIx::Recordset -> LastError ()
Returns the last error message, if any. If called in an array context the first
element receives the last error message and the second the last error code.
DATA ACCESS
The data which is returned by a Select or a Search can be accessed in two ways:
1.) Through an array. Each item of the array corresponds to one of the selected records.
Each array-item is a reference to a hash containing an entry for every field.
Example:
$set[1]{id} access the field 'id' of the second record found
$set[3]{name} access the field 'name' of the fourth record found
The record is fetched from the DBD driver when you access it the first time and is stored
by DBIx::Recordset for later access. If you don't access the records one after each other,
the skipped records are not stored and therefore can't be accessed anymore, unless you
specify the !StoreAll parameter.
2.) DBIx::Recordset holds a current record which can be accessed directly via a hash. The
current record is the one you last accessed via the array. After a Select or Search, it is
reset to the first record. You can change the current record via the methods Next, Prev,
First, Add.
Example:
$set{id} access the field 'id' of the current record
$set{name} access the field 'name' of the current record
Instead of doing a Select or Search you can directly access one row of a table when you
have tied a hash to DBIx::Recordset::Hash or have specified the !HashAsRowKey Parameter.
The hashkey will work as primary key to the table. You must specify the !PrimKey as setup
parameter.
Example:
$set{4}{name} access the field 'name' of the row with primary key = 4
MODIFYING DATA DIRECTLY
One way to update/insert data into the database is by using the Update, Insert or Execute
method of the DBIx::Recordset object. A second way is to directly assign new values to the
result of a previous Select/Search.
Example:
# setup a new object and search all records with name xyz
*set = DBIx::Recordset -> Search ({'!DataSource' => 'dbi:db:tab',
'!PrimKey => 'id', '!Table' => 'tabname',
'name' => 'xyz'}) ;
#now you can update an existing record by assigning new values
#Note: if possible, specify a PrimKey for update to work faster
$set[0]{'name'} = 'zyx' ;
# or insert a new record by setting up an new array row
$set[9]{'name'} = 'foo' ;
$set[9]{'id'} = 10 ;
# if you don't know the index of a new row you can obtain
# one by using Add
my $i = $set -> Add () ;
$set[$i]{'name'} = 'more foo' ;
$set[$i]{'id'} = 11 ;
# or add an empty record via Add and assign the values to the current
# record
$set -> Add () ;
$set{'name'} = 'more foo' ;
$set{'id'} = 11 ;
# or insert the data directly via Add
$set -> Add ({'name' => 'even more foo',
'id' => 12}) ;
# NOTE: up to this point, NO data is actually written to the db!
# we are done with that object, Undef will flush all data to the db
DBIx::Recordset::Undef ('set') ;
IMPORTANT: The data is not written to the database until you explicitly call flush, or a
new query is started, or the object is destroyed. This is to keep the actual writes to the
database to a minimum.
WORKING WITH MULTIPLE TABLES
DBIx::Recordset has some nice features to make working with multiple tables and their
relations easier.
Joins
First, you can specify more than one table to the !Table parameter. If you do so, you need
to specify how both tables are related. You do this with !TabRelation parameter. This
method will access all the specified tables simultanously.
Join Example:
If you have the following two tables, where the field street_id is a pointer to the table
street:
table name
name char (30),
street_id integer
table street
id integer,
street char (30),
city char (30)
You can perform the following search:
*set = DBIx::Recordset -> Search ({'!DataSource' => 'dbi:drv:db',
'!Table' => 'name, street',
'!TabRelation'=> 'name.street_id = street.id'}) ;
The result is that you get a set which contains the fields name, street_id, street, city
and id, where id is always equal to street_id. If there are multiple streets for one name,
you will get as many records for that name as there are streets present for it. For this
reason, this approach works best when you have a 1:1 relation.
It is also possible to specify JOINs. Here's how:
*set = DBIx::Recordset -> Search ({
'!DataSource' => 'dbi:drv:db',
'!Table' => 'name, street',
'!TabJoin' => 'name LEFT JOIN street ON (name.street_id=street.id)'}) ;
The difference between this and the first example is that this version also returns a
record even if neither table contains a record for the given id. The way it's done depends
on the JOIN you are given (LEFT/RIGHT/INNER) (see your SQL documentation for details about
JOINs).
Links
If you have 1:n relations between two tables, the following may be a better way to handle
it:
*set = DBIx::Recordset -> Search ({'!DataSource' => 'dbi:drv:db',
'!Table' => 'name',
'!Links' => {
'-street' => {
'!Table' => 'street',
'!LinkedField' => 'id',
'!MainField' => 'street_id'
}
}
}) ;
After that query, every record will contain the fields name and street_id. Additionally,
there is a pseudofield named -street, which could be used to access another recordset
object, which is the result of a query where street_id = id. Use
$set{name} to access the name field
$set{-street}{street} to access the first street (as long as the
current record of the subobject isn't
modified)
$set{-street}[0]{street} first street
$set{-street}[1]{street} second street
$set{-street}[2]{street} third street
$set[2]{-street}[1]{street} to access the second street of the
third name
You can have multiple linked tables in one recordset; you can also nest linked tables or
link a table to itself.
NOTE: If you select only some fields and not all, the field which is specified by
'!MainField' must be also given in the '!Fields' or '$fields' parameter.
NOTE: See also Automatic detection of links below
LinkName
In the LinkName feature you may specify a "name" for every table. A name is one or more
fields which gives a human readable "key" of that record. For example in the above example
id is the key of the record, but the human readable form is street.
*set = DBIx::Recordset -> Search ({'!DataSource' => 'dbi:drv:db',
'!Table' => 'name',
'!LinkName' => 1,
'!Links' => {
'-street' => {
'!Table' => 'street',
'!LinkedField' => 'id',
'!MainField' => 'street_id',
'!NameField' => 'street'
}
}
}) ;
For every record in the table, this example will return the fields:
name street_id street
If you have more complex records, you may also specify more than one field in !NameField
and pass it as an reference to an array e.g. ['street', 'city']. In this case, the result
will contain
name street_id street city
If you set !LinkName to 2, the result will contain the fields
name street_id STREET_ID
where STREET_ID contains the values of the street and city fields joined together. If you
set !LinkName to 3, you will get only
name street_id
where street_id contains the values of the street and city fields joined together.
NOTE: The !NameField can also be specified as a table attribute with the function
TableAttr. In this case you don't need to specify it in every link. When a !NameField is
given in a link description, it overrides the table attribute.
Automatic detection of links
DBIx::Recordset and DBIx::Database will try to automatically detect links between tables
based on the field and table names. For this feature to work, the field which points to
another table must consist of the table name and the field name of the destination joined
together with an underscore (as in the above example name.street_id). Then it will
automatically recognized as a pointer to street.id.
*set = DBIx::Recordset -> Search ({'!DataSource' => 'dbi:drv:db',
'!Table' => 'name') ;
is enough. DBIx::Recordset will automatically add the !Links attribute. Additionally,
DBIx::Recordset adds a backlink (which starts with a star ('*')), so for the table street,
in our above example, there will be a link, named *name, which is a pointer from table
street to all records in the table name where street.id is equal to name.street_id.
You may use the !Links attribute to specify links which can not be automatically detected.
NOTE: To specify more then one link from one table to another table, you may prefix the
field name with an specifier followed by two underscores. Example: first__street_id,
second__street_id. The link (and backlink) names are named with the prefix, e.g.
-first__street and the backlink *first__name.
DBIx::Database
The DBIx::Database object gathers information about a datasource. Its main purpose is to
create, at startup, an object which retrieves all necessary information from the database.
This object detects links between tables and stores this information for use by the
DBIx::Recordset objects. There are additional methods which allow you to add kinds of
information which cannot be retrieved automatically.
Example:
$db = DBIx::Database -> new ({'!DataSource' => $DSN,
'!Username' => $User,
'!Password' => $Password,
'!KeepOpen' => 1}) ;
*set = DBIx::Recordset -> Search ({'!DataSource' => $db,
'!Table' => 'foo',
}) ;
new ($data_source, $username, $password, \%attr, $saveas, $keepopen)
$data_source
Specifies the database to which to connect. Driver/DB/Host. Same as the first
parameter to the DBI connect function.
$username
Username (optional)
$password
Password (optional)
\%attr
Attributes (optional) Same as the attribute parameter to the DBI connect function.
$saveas
Name for this DBIx::Database object to save as. The name can be used in
DBIx::Database::Get, or as !DataSource parameter in call to the DBIx::Recordset
object.
This is intended as mechanism to retrieve the necessary metadata; for example, when
your web server starts (e.g. in the startup.pl file of mod_perl). Here you can give
the database object a name. Later in your mod_perl or Embperl scripts, you can use
this metadata by specifying this name. This will speed up the setup of DBIx::Recordset
object without the need to pass a reference to the DBIx::Database object.
$keepopen
Normaly the database connection will be closed after the metadata has been retrieved
from the database. This makes sure you don't get trouble when using the new method in
a mod_perl startup file. You can keep the connection open to use them in further setup
calls to DBIx::Recordset objects. When the database is not kept open, you must specify
the "!Password" parameter each time the recordset has to be reopend.
$tabfilter
same as setup parameter !TableFilter
$doonconnect
same as setup parameter !DoOnConnect
$reconnect
If set, forces DBIx::Database to "undef" any preexisting database handle and call
connect in any case. This is useful in together with Apache::DBI. While the database
connection are still kept open by Apache::DBI, Apache::DBI preforms a test if the
handle is still vaild (which DBIx::Database itself wouldn't).
You also can specify a hashref which can contain the following parameters:
!DataSource, !Username, !Password, !DBIAttr, !SaveAs, !KeepOpen, !TableFilter,
!DoOnConnect, !Reconnect
$db = DBIx::Database -> DBHdl
returns the database handle (only if you specify !KeepOpen when calling "new").
$db = DBIx::Database -> Get ($name)
$name = The name of the DBIx::Database object you wish to retrieve
Get a DBIx::Database object which has already been set up based on the name.
$db -> TableAttr ($table, $key, $value)
get and/or set an attribute for an specfic table.
$table
Name of table(s). You may use '*' instead of the table name to specify a default value
which applies to all tables for which no other value is specified.
$key
key to set/get
$value
if present, set key to this value
$db -> TableLink ($table, $linkname, $value)
Get and/or set a link description for an table. If no $linkname is given, returns all
links for that table.
$table
Name of table(s)
$linkname
Name of link to set/get
$value
if present, this must be a reference to a hash with the link decription. See !Links
for more information.
$db -> MetaData ($table, $metadata, $clear)
Get and/or set the meta data for the given table.
$table
Name of table(s)
$metadata
If present, this must be a reference to a hash with the new metadata. You should only
use this if you really know what you are doing.
$clear
Clears the metadata for the given table, The next call to DBIx::Database -> new will
recreate the metadata. Useful if your table has changed (e.g. by ALTER TABLE).
$db -> AllTables
This returns a reference to a hash of the keys to all the tables of the datasource.
$db -> AllNames ($table)
Returns a reference to an array of all fieldnames for the given table.
$db -> AllTypes ($table)
Returns a reference to an array of all fieldtypes for the given table.
$db -> do ($statement, $attribs, \%params)
Same as DBI. Executes a single SQL statement on the open database.
$db -> CreateTables ($dbschema, $schemaname, $user, $setpriv, $alterconstraints)
The CreateTables method is used to create an modify the schema of your database. The idea
is to define the schema as a Perl data structure and give it to this function, it will
compare the actual schema of the database with the one provided and creates new tables,
new fields or drop fields as necessary. It also sets the permission on the tables and is
able to create indices for the tables. It will never drop a whole table! NOTE: Create
tables cannot deteminate changes of the datatype of a fields, because DBI is not able to
provide this information in a standard way.
$dbschema
Either the name of a file which contains the schema or a array ref. See below how this
schema must look like.
$schemaname
schemaname (only used for Oracle)
$user
User that should be granted access. See "!Grant" parameter.
$setpriv
If set to true, access privilegs are revoked and granted again for already existing
tables. That is necessary when $user changes.
$alterconstraints
If set to true contrains are cleared/set for already existing fields. DBI doesn't
provide a database independ way to check which contrains already exists.
Schema definition
If give as a filename, the file must contain an hash %DBDefault and an array @DBSchema.
The first gives default and the second is an array of hashs. Every of this hash defines
one table.
Example:
%DBDefault =
(
'!Grant' =>
[
'select',
'insert',
'update',
'delete',
],
)
;
@DBSchema = (
{
'!Table' => 'language',
'!Fields' =>
[
'id' => 'char (2)',
'directory' => 'varchar(40)',
'name' => 'varchar(40)',
'europe' => 'bool',
],
'!PrimKey' => 'id',
'!Default' =>
{
'europe' => 1,
},
'!Init' =>
[
{'id' => 'de', 'directory' => 'html_49', 'name' => 'deutsch'},
{'id' => 'en', 'directory' => 'html_76', 'name' => 'english'},
{'id' => 'fr', 'directory' => 'html_31', 'name' => 'french'},
],
'!Index' =>
[
'directory' => '',
]
},
);
The hash which defines a table can have the following keys:
!Table
Gives the table name
!Fields
Array with field names and types. There a some types which a translated database
specifc. You can define more database specific translation in Compat.pm.
bit boolean
counter
If an autoincrementing integer. For databases (like Oracle) that doesn't have such
a datatype a sequence is generated to provide the autoincrement value and the
fields will be of type integer.
tinytext
variables length text with up to 255 characters
text
variables length text
!PrimKey
Name of the primary key
!For
Can contain the same key as the table definintion, but is only executed for a specifc
database.
Example:
'!For' => {
'Oracle' => {
'!Constraints' =>
{
'web_id' => ['foreign key' => 'REFERENCES web (id)'],
'prim__menu_id' => ['!Name' => 'web_prim_menu_id',
'foreign key' => 'REFERENCES menu (id)',
'not null' => ''],
}
},
},
!Contraints
Used to define constraints. See example under "!For".
!Name => <name>
<constraint> => <second part>
!Init
Used to initialy populate the table.
!Default
Used to set a default value for a field, when the table is created. This doesn't have
any affect for further INSERTs/UPDATEs.
!Grant
Give the rights that should be grant to $user
!Index
Gives the names for the fields for which indices should be created. If the second
parameter for an index is not empty, it gives the index name, otherwise a default name
is used.
$db -> DropTables ($schemaname, $user)
Drops all tables. Use with care!
$schemaname
schemaname (only used for Oracle)
$user
User that should be revoked access. See "!Grant" parameter.
Casesensitive/insensitiv
In SQL all names (field/tablenames etc.) should be case insensitive. Various DBMS handle
the case of names differently. For that reason DBIx::Recordset translates all names to
lower case, ensuring your application will run with any DBMS, regardless of whether names
are returned in lower/uppercase by the DBMS. Some DBMS are case-sensitive (I know at least
Sybase, depending on your collate settings). To use such a case-sensitive DBMS, it is best
to create your database with all names written in lowercase. In a situation where this
isn't possible, you can set $PreserveCase to 1. In this case DBIx::Recordset will not
perform any case translation. NOTE: $PreserveCase is still experimental and may change in
future releases.
FETCHSIZE / $FetchsizeWarn
Some operations in Perl (i.e. "foreach", assigning arrays) need to know the size of the
whole array. When Perl needs to know the size of an array it call the method "FETCHSIZE".
Since not all DBD drivers/DBMS returns the number of selected rows after an SQL "SELECT",
the only way to really determine the number of selected rows would be to fetch them all
from the DBMS. Since this could cause a lot of work, it may be very inefficent. Therefore
DBIx::Recordset by default calls die() when Perl calls FETCHSIZE. If you know your DBD
drivers returns the correct value in $sth -> "rows" after the execution of an "SELECT",
you can set $FetchsizeWarn to zero to let "FETCHSIZE" return the value from $sth ->
"rows". Setting it to 1 will cause DBIx::Recordset to only issue a warning, but perform
the operation.
NOTE: Since I don't have enough experience with the behaviour of this feature with
different DBMS, this is considered experimental.
DEBUGGING
DBIx::Recordset is able to write a logfile so you can see what's happening inside. There
are two public variables and the "!Debug" parameter used for this purpose:
$DBIx::Recordset::Debug or !Debug
Debuglevel
0 = off
1 = log only errors
2 = show connect, disconnect and SQL Statements
3 = some more infos
4 = much infos
$DBIx::Recordset::Debug sets the default debug level for new objects, "!Debug" can be
used to set the debuglevel on a per object basis.
DBIx::Recordset::LOG
The filehandle used for logging. The default is STDOUT, unless you are running under
HTML::Embperl, in which case the default is the Embperl logfile.
Example:
# open the log file
open LOG, ">test.log" or die "Cannot open test.log" ;
# assign filehandle
*DBIx::Recordset::LOG = \*LOG ;
# set debugging level
$DBIx::Recordset::Debug = 2 ;
# now you can create a new DBIx::Recordset object
SECURITY
Since one possible application of DBIx::Recordset is its use in a web-server environment,
some attention should paid to security issues.
The current version of DBIx::Recordset does not include extended security management, but
some features can be used to make your database access safer. (More security features will
come in future releases.)
First of all, use the security feature of your database. Assign the web server process as
few rights as possible.
The greatest security risk is when you feed DBIx::Recordset a hash which contains the
formfield data posted to the web server. Somebody who knows DBIx::Recordset can post other
parameters than those you would expect a normal user to post. For this reason, a primary
issue is to override all parameters which should never be posted by your script.
Example:
*set = DBIx::Recordset -> Search ({%fdat,
('!DataSource' => "dbi:$Driver:$DB", '!Table' =>
"$Table")}) ;
(assuming your posted form data is in %fdat). The above call will make sure that nobody
from outside can override the values supplied by $Driver, $DB and $Table.
It is also wise to initialize your objects by supplying parameters which can not be
changed.
Somewhere in your script startup (or at server startup time) add a setup call:
*set = DBIx::Recordset-> Setup ({'!DataSource' => "dbi:$Driver:$DB",
'!Table' => "$Table",
'!Fields' => "a, b, c"}) ;
Later, when you process a request you can write:
$set -> Search (\%fdat) ;
This will make sure that only the database specified by $Driver, $DB, the table specified
by $Table and the Fields a, b, and c can be accessed.
Compatibility with different DBD drivers
I have put a great deal of effort into making DBIx::Recordset run with various DBD
drivers. The problem is that not all necessary information is specified via the DBI
interface (yet). So I have made the module DBIx::Compat which gives information about the
difference between various DBD drivers and their underlying database systems. Currently,
there are definitions for:
DBD::mSQL
DBD::mysql
DBD::Pg
DBD::Solid
DBD::ODBC
DBD::CSV
DBD::Oracle (requires DBD::Oracle 0.60 or higher)
DBD::Sysbase
DBD::Informix
DBD::InterBase
DBIx::Recordset has been tested with all those DBD drivers (on Linux 2.0.32, except
DBD::ODBC, which has been tested on Windows '95 using Access 7 and with MS SQL Server).
If you want to use another DBD driver with DBIx::Recordset, it may be necessary to create
an entry for that driver. See perldoc DBIx::Compat for more information.
EXAMPLES
The following are some examples of how to use DBIx::Recordset. The Examples are from the
test.pl. The examples show the DBIx::Recordset call first, followed by the generated SQL
command.
*set = DBIx::Recordset-> Setup ({'!DataSource' => "dbi:$Driver:$DB",
'!Table' => "$Table"}) ;
Setup a DBIx::Recordset for driver $Driver, database $DB to access table $Table.
$set -> Select () ;
SELECT * from <table> ;
$set -> Select ({'id'=>2}) ;
is the same as
$set1 -> Select ('id=2') ;
SELECT * from <table> WHERE id = 2 ;
$set -> Search({ '$fields' => 'id, balance AS paid - total ' }) ;
SELECT id, balance AS paid - total FROM <table>
$set -> Select ({name => "Second Name\tFirst Name"}) ;
SELECT * from <table> WHERE name = 'Second Name' or name = 'First Name' ;
$set1 -> Select ({value => "9991 9992\t9993",
'$valuesplit' => ' |\t'}) ;
SELECT * from <table> WHERE value = 9991 or value = 9992 or value = 9993 ;
$set -> Select ({'+name&value' => "9992"}) ;
SELECT * from <table> WHERE name = '9992' or value = 9992 ;
$set -> Select ({'+name&value' => "Second Name\t9991"}) ;
SELECT * from <table> WHERE (name = 'Second Name' or name = '9991) or
(value = 0 or value = 9991) ;
$set -> Search ({id => 1,name => 'First Name',addon => 'Is'}) ;
SELECT * from <table> WHERE id = 1 and name = 'First Name' and addon = 'Is' ;
$set1 -> Search ({'$start'=>0,'$max'=>2, '$order'=>'id'}) or die "not ok
($DBI::errstr)" ;
SELECT * from <table> ORDER BY id ;
B<Note:> Because of the B<start> and B<max> only records 0,1 will be returned
$set1 -> Search ({'$start'=>0,'$max'=>2, '$next'=>1, '$order'=>'id'}) or die "not ok
($DBI::errstr)" ;
SELECT * from <table> ORDER BY id ;
B<Note:> Because of the B<start>, B<max> and B<next> only records 2,3 will be
returned
$set1 -> Search ({'$start'=>2,'$max'=>1, '$prev'=>1, '$order'=>'id'}) or die "not ok
($DBI::errstr)" ;
SELECT * from <table> ORDER BY id ;
B<Note:> Because of the B<start>, B<max> and B<prev> only records 0,1,2 will be
returned
$set1 -> Search ({'$start'=>5,'$max'=>5, '$next'=>1, '$order'=>'id'}) or die "not ok
($DBI::errstr)" ;
SELECT * from <table> ORDER BY id ;
B<Note:> Because of the B<start>, B<max> and B<next> only records 5-9 will be
returned
*set6 = DBIx::Recordset -> Search ({ '!DataSource' => "dbi:$Driver:$DB",
'!Table' => "t1, t2",
'!TabRelation' =>
"t1.value=t2.value",
'!Fields' => 'id, name, text',
'id' => "2\t4" }) or die "not ok
($DBI::errstr)" ;
SELECT id, name, text FROM t1, t2 WHERE (id=2 or id=4) and t1.value=t2.value ;
$set6 -> Search ({'name' => "Fourth Name" }) or die "not ok
($DBI::errstr)" ;
SELECT id, name, text FROM t1, t2 WHERE (name = 'Fourth Name') and
t1.value=t2.value
;
$set6 -> Search ({'id' => 3,
'$operator' => '<' }) or die "not ok ($DBI::errstr)" ;
SELECT id, name, text FROM t1, t2 WHERE (id < 3) and t1.value=t2.value ;
$set6 -> Search ({'id' => 4,
'name' => 'Second Name',
'*id' => '<',
'*name' => '<>' }) or die "not ok ($DBI::errstr)" ;
SELECT id, name, text FROM t1, t2 WHERE (id<4 and name <> 'Second Name') and
t1.value=t2.value ;
$set6 -> Search ({'id' => 2,
'name' => 'Fourth Name',
'*id' => '<',
'*name' => '=',
'$conj' => 'or' }) or die "not ok ($DBI::errstr)" ;
SELECT id, name, text FROM t1, t2 WHERE (id<2 or name='Fourth Name') and
t1.value=t2.value ;
$set6 -> Search ({'+id|addon' => "7\tit",
'name' => 'Fourth Name',
'*id' => '<',
'*addon' => '=',
'*name' => '<>',
'$conj' => 'and' }) or die "not ok ($DBI::errstr)" ;
SELECT id, name, text FROM t1, t2 WHERE (t1.value=t2.value) and ( ((name <>
Fourth
Name)) and ( ( id < 7 or addon = 7) or ( id < 0 or addon = 0)))
$set6 -> Search ({'+id|addon' => "6\tit",
'name' => 'Fourth Name',
'*id' => '>',
'*addon' => '<>',
'*name' => '=',
'$compconj' => 'and',
'$conj' => 'or' }) or die "not ok ($DBI::errstr)" ;
SELECT id, name, text FROM t1, t2 WHERE (t1.value=t2.value) and ( ((name =
Fourth
Name)) or ( ( id > 6 and addon <> 6) or ( id > 0 and addon <> 0))) ;
*set7 = DBIx::Recordset -> Search ({ '!DataSource' => "dbi:$Driver:$DB",
'!Table' => "t1, t2",
'!TabRelation' => "t1.id=t2.id",
'!Fields' => 'name, typ'}) or die "not ok
($DBI::errstr)" ;
SELECT name, typ FROM t1, t2 WHERE t1.id=t2.id ;
%h = ('id' => 22,
'name2' => 'sqlinsert id 22',
'value2'=> 1022) ;
*set9 = DBIx::Recordset -> Insert ({%h,
('!DataSource' => "dbi:$Driver:$DB",
'!Table' => "$Table[1]")}) or die "not ok
($DBI::errstr)" ;
INSERT INTO <table> (id, name2, value2) VALUES (22, 'sqlinsert id 22', 1022) ;
%h = ('id' => 22,
'name2' => 'sqlinsert id 22u',
'value2'=> 2022) ;
$set9 -> Update (\%h, 'id=22') or die "not ok ($DBI::errstr)" ;
UPDATE <table> WHERE id=22 SET id=22, name2='sqlinsert id 22u', value2=2022 ;
%h = ('id' => 21,
'name2' => 'sqlinsert id 21u',
'value2'=> 2021) ;
*set10 = DBIx::Recordset -> Update ({%h,
('!DataSource' => "dbi:$Driver:$DB",
'!Table' => "$Table[1]",
'!PrimKey' => 'id')}) or die "not ok
($DBI::errstr)" ;
UPDATE <table> WHERE id=21 SET name2='sqlinsert id 21u', value2=2021 ;
%h = ('id' => 21,
'name2' => 'Ready for delete 21u',
'value2'=> 202331) ;
*set11 = DBIx::Recordset -> Delete ({%h,
('!DataSource' => "dbi:$Driver:$DB",
'!Table' => "$Table[1]",
'!PrimKey' => 'id')}) or die "not ok
($DBI::errstr)" ;
DELETE FROM <table> WHERE id = 21 ;
*set12 = DBIx::Recordset -> Execute ({'id' => 20,
'*id' => '<',
'!DataSource' => "dbi:$Driver:$DB",
'!Table' => "$Table[1]",
'!PrimKey' => 'id'}) or die "not ok
($DBI::errstr)" ;
SELECT * FROM <table> WHERE id<20 ;
*set13 = DBIx::Recordset -> Execute ({'=search' => 'ok',
'name' => 'Fourth Name',
'!DataSource' => "dbi:$Driver:$DB",
'!Table' => "$Table[0]",
'!PrimKey' => 'id'}) or die "not ok ($DBI::errstr)" ;
SELECT * FROM <table> WHERE ((name = Fourth Name))
$set12 -> Execute ({'=insert' => 'ok',
'id' => 31,
'name2' => 'insert by exec',
'value2' => 3031,
# Execute should ignore the following params, since it is already setup
'!DataSource' => "dbi:$Driver:$DB",
'!Table' => "quztr",
'!PrimKey' => 'id99'}) or die "not ok ($DBI::errstr)" ;
SELECT * FROM <table> ;
$set12 -> Execute ({'=update' => 'ok',
'id' => 31,
'name2' => 'update by exec'}) or die "not ok ($DBI::errstr)" ;
UPDATE <table> SET name2=update by exec,id=31 WHERE id=31 ;
$set12 -> Execute ({'=insert' => 'ok',
'id' => 32,
'name2' => 'insert/upd by exec',
'value2' => 3032}) or die "not ok ($DBI::errstr)" ;
INSERT INTO <table> (name2,id,value2) VALUES (insert/upd by exec,32,3032) ;
$set12 -> Execute ({'=delete' => 'ok',
'id' => 32,
'name2' => 'ins/update by exec',
'value2' => 3032}) or die "not ok ($DBI::errstr)" ;
DELETE FROM <table> WHERE id=32 ;
SUPPORT
As far as possible for me, support will be available via the DBI Users' mailing list.
(dbi-user@fugue.com)
AUTHOR
G.Richter (richter@dev.ecos.de)
SEE ALSO
Perl(1)
DBI(3)
DBIx::Compat(3)
HTML::Embperl(3) http://perl.apache.org/embperl/
Tie::DBI(3) http://stein.cshl.org/~lstein/Tie-DBI/