Ioannis Tambouras > Pg-Loader > pgloader.pl

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NAME ^

pgloader.pl - loads and updates data to Postgres tables

SYNOPSIS ^

  pgloader.pl  -siTV  person
  pgloader.pl  --help

DESCRIPTION ^

pgloader.pl loads tables to a Postgres database. It is an enhanced version of the pgloader(1) python program, written by other authors. Data are read from the file specified in the configuration file (defaults to pgloader.dat).

This version of pgloader exhibits the -i option which drops all table indexes and recreates them again after COPY. Loading is performed inside transactions, supports updates, and the libpq "service" connection method. It is meant to be a drop-in replacement to the python pgloader(1), numerous additional CLI options, though some non-core functionalities are not implemented .

OPTIONS ^

 -q                         quiet  mode     (same as loglevel=1)
 -v                         verbose mode    (same as loglevel=3)
 -d                         debug  mode     (same as loglevel=4)
 -l,  --loglevel            set loglevel 1 to 4  . Defaults to 2
 -c,  --config              configuration file; defaults to "pgloader.conf"
 -g,  --generate            generate a sample configuration file
 -i,  --indexes             disable indexes during COPY
 -n,  --dry_run             dry_run
 -s,  --summary             show summary
 -D,  --disable_triggers    disable triggers during loading
 -T,  --truncate            truncate table before loading
 -V,  --vacuum              vacuum analyze table after loading
 -C,  --count               number of lines to process
      --version             show version and exit
 -F,  --from                process from this line number

CONFIGURATION FILE ^

The configuration file follows the ini configuration format and is divided into these sections:

[pgslq]

This is the only mandatory section and defines database connection parameters.

 base           [required]  name of database
 host           [optional]  hostname to connect. (Defaults to localhost)
 port           [optional]  port number. (Defaults to 5432)
 user           [optional]  name of login user. (Defaults to user's epid) 
 pass           [optional]  user password. Not needed if using libpq defaults.
 pgsysconfdir   [optional]  dir for PGSYSCONFDIR
 service        mandatory only when pgsysconfdir ( or when the enviromental
                variable PGSYSCONFDIR ) is defined .
[template1]

This section defines a template. In this example, the name template1 was chosen as the name for the template. Templates are optional and hold default values for table sections (defined bellow). You may define zero or unlimited number of templates. A template must contain the entry 'template', plus any entry allowed in table sections.

 template   when defined to any true value, the template as enabled; 
            leave it blank to ignore all entries of the template 
[person]

A table section controls all aspects of data loading. When invoking pgloader.pl from the command line, you must specify which section pgloader should read so the corresponding table section can take effect. Here, The name person was arbitrary chosen. In a table section you can control loading with the following parameters:

 table                [ MANDATORY ]  Tablename or schema.tablename .
                      Defaults to section name.

 filename             [ OPTIONAL ]  Filename containing data for the table
                      If unspecified, or set to 'STDIN', input data should
                      arrive from standard input.

 use_template         [ OPTIONAL ]   Template to use for default values.

 field_sep            Delimiter that separates fields. The default for
                      text formats is TAB, and for csv formats is ','

 format               [ OPTIONAL ]   Must be either 'text' or 'csv' (without
                      the quotes). Default is text.

 copy                 [ OPTIONAL ]   Names of columns found in data file.
                      The names must match those in the database table.
                      Defauls to * . If you don't wish to list the names
                      in there proper order, you must append a number next
                      to their name; useful when the data file contains data
                      data in different order.
                      Example:  copy = age, last, first
                                copy = first:3, age:1, last:2

copy_columns [ OPTIONAL ] Which columns to copy. The char '*' (the default) means all columns specified using the "copy" parameter; careful, it does not mean all columns defined for the table in database table, pertains only to columns in the file and whose names were specified earlier with parameter copy. Again, it is about column names in data file. Names need not obey a particular order. Example: copy_columns = first, last, age copy_columns = *

update [ OPTIONAL ] Names of columns found in data file. By including this tag, you are switching to the UPDATE mode for the purpose to change some (or all) fields of an existing row. Updates are allowed only if the the table contains primary keys. The format and semantics are identical to "copy".

update_copy [ OPTIONAL ] Names of columns for the update mode. The format and semantics are identical to "copy_columns".

reject_data [ OPTIONAL ] Specifies the pathname for the file to record rejected data.

reject_log [ OPTIONAL ] Specifies the pathname for the file to record diagnostics.

only_cols [ OPTIONAL ] Same purpose as "copy_columns", but here we use numbers (instead of names), to specify the columns. Numbers start from 1, ranges are also allowed. The char '*' means all columns, and is the default. Example: only_cols = 1-2, 3, 5 only_cols = 3

 quotechar            [ OPTIONAL ]    Usefull only for csv formats. Default is "

 null                 [ OPTIONAL ]    String that indicates the  NULL value ;
                      usefull only for text mode. Default is string '\NA'

skipinitialspace [ OPTIONAL ] Ignore leading and trailing whitespace

udc_COLUMNAME [ OPTIONAL ] Assign this value for all rows whose name is column COLUMNAME Examples: udc_title = Sir udc_age = 99 udc_race = white

reformat [ OPTIONAL ] reformat values of the age column by passing it to function upper(), in the John::Util module reformat = age:John::Util::upper

copy_every [ OPTIONAL ] How many tuples to copy per transaction. More transactions are automatically created to insert the rest of the date, each inserting upto that many tuples. Defaults is 10_000 TIP: set this parameter to 1 if you wish to avoid the case where one bad tuple cause other tuples to also fail. datestyle [ OPTIONAL ] Set datestyle parameter, omit all quotes. Example: datestyle=euro datestyle=us

client_encoding [ OPTIONAL ] Set client encoding, omit all quotes. lc_messages [ OPTIONAL ] Set lc messages parameter, omit all quotes. lc_numeric [ OPTIONAL ] Set lc numeric parameter, omit all quotes. lc_monetary [ OPTIONAL ] Set lc monetary, omit all quotes. lc_time [ OPTIONAL ] Set lc time, omit all quotes.

NOTE: Because of how the ini format is defined as a value separator, if you need to include the ',' char, you must escape it with \ . For example: field_sep = \, sets field_sep to char ','

SEE ALSO ^

http://pgfoundry.org/projects/pgloader/ hosts the official python project. This project has nothing to do with this Perl program.

AUTHOR ^

Ioannis Tambouras, <ioannis@cpan.org>

COPYRIGHT AND LICENSE ^

Copyright (C) 2008 by Ioannis Tambouras

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.0 or, at your option, any later version of Perl 5 you may have available.

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