NAME

       dbs_update - Update SQL Databases

DESCRIPTION

       dbs_update is an utility to update SQL databases from text files.

   FORMAT OF THE TEXT FILES
       dbs_update assumes that each line of the input contains a data record and that the field within the
       records are separated by tabulators.  You can tell dbs_update about the input format with the --format
       option.

       The first field of the data record is used as table specification.  These consists of the table name and
       optionally the index of starting column, separated by a dot.

       Alternatively dbs_update can read the column names from the first line of input (see the -h/--headline
       option). These can even be aliases for the real column names (see the -m/--map option).

COMMAND LINE PARAMETERS

       Required command line parameters are the DBI driver ("Pg" for Postgres or "mysql" for MySQL) and the
       database name. The third parameter is optionally and specifies the database user and/or the host where
       the database resides ("racke", "racke@linuxia.de" or "@linuxia.de").

OPTIONS

   --cleanse
       Removes all records which remain unaffected from the update process. The same result as deleting all
       records from the table first and then running dbs_update, but the table is not empty in the meantime.

   -c COLUMN,COLUMN,..., --columns=COLUMN,COLUMN,...
       Update only the table columns given by the COLUMN parameters.  To exclude columns from the update prepend
       "!" or "^" to the parameters.

   --rows=ROW,ROW,...
       Update only the input rows given by the ROW parameters.  The first row is 1 where headlines doesn't
       count.  To exclude rows from the update prepend "!" or "^" to the parameters.

   -f FILE, --file=FILE
       Reads records from file FILE instead of from standard input.

   --format=FORMAT[SEPCHAR]
       Assumes FORMAT as format for the input. Only CSV can be specified for now, default is TAB. The default
       field separator for CSV is a comma, you may change this by appending the separator to the format.

   -h, --headline
       Reads the column names from the first line of the input instead of dedicting them from the database
       layout. Requires the -t/--table option.

   -i, --insert-only
       Insert new database entries only, skip others.

   -k COUNT, -k KEY,KEY,..., --keys=COUNT, --keys=KEY,KEY,...
       Specifies the keys for the table(s) either as the number of columns used as keys or by specifying them
       explicitly as comma separated arguments to the option.  This is used for the detection of existing
       records.

   -m ALIASDEF, --map=ALIASDEF
       Maps the names found in the first line of input to the actual column names in the database. The alias and
       the column name are separated with "=" signs and the different entries are separated by ";" signs, e.g.
       "Art-No.=code;Short Description=shortdescr'".

   --map-filter=FILTER
       Applies a filter to the column names read from the input file.  Currently there is only the "lc" filter
       available.

   --match-sql=FIELD:{STATEMENT}
       Updates only records where the value of the column FIELD is in the result set of the SQL statement
       STATEMENT, e.g. "category:{select distinct name from categories}".

   -o, --update-only
       Updates existing database entries only, stops if it detects new ones.

   -r ROUTINE, --routine=ROUTINE
       Applies ROUTINE to any data record. ROUTINE must be a subroutine.  dbs_update passes the table name and a
       hash reference to this subroutine.  The keys of the hash are the column names and the values are the
       corresponding field values. If the return value of ROUTINE is not a truth value, the data record will be
       skipped.

       "sub {my ($table, $valref) = @_;
           unless (defined $$valref{country} && $$valref{country} !~ /\S/) {
               $$valref{country} = "Germany";
           }
           1; }"

   --skipbadlines
       Lines not matching the assumed format are ignored. Without this option, dbs_update simply stops.

   -t TABLE, --table=TABLE
       Uses TABLE as table name for all records instead of the first field name.

AUTHOR

       Stefan Hornburg (Racke), racke@linuxia.de

SEE ALSO

       perl(1), DBIx::Easy(3)