NAME
    DBIx::Diff::Schema - Compare schema of two DBI databases

VERSION
    This document describes version 0.097 of DBIx::Diff::Schema (from Perl
    distribution DBIx-Diff-Schema), released on 2020-05-06.

SYNOPSIS
     use DBIx::Diff::Schema qw(diff_db_schema diff_table_schema
                               db_schema_eq table_schema_eq);

    To compare schemas of whole databases:

     my $res = diff_db_schema($dbh1, $dbh2);
     say "the two dbs are equal" if db_schema_eq($dbh1, $dbh2);

    To compare schemas of a single table from two databases:

     my $res = diff_table_schema($dbh1, $dbh2, 'tablename');
     say "the two tables are equal" if table_schema_eq($dbh1, $dbh2, 'tablename');

DESCRIPTION
    Currently only tested on Postgres and SQLite.

FUNCTIONS
  db_schema_eq
    Usage:

     db_schema_eq($dbh1, $dbh2) -> any

    Return true if two DBI databases have the same schema.

    This is basically just a shortcut for:

     my $res = diff_db_schema(...);
     !%$res;

    This function is not exported by default, but exportable.

    Arguments ('*' denotes required arguments):

    *   $dbh1* => *obj*

        DBI database handle for the first database.

    *   $dbh2* => *obj*

        DBI database handle for the second database.

    Return value: (any)

  diff_db_schema
    Usage:

     diff_db_schema($dbh1, $dbh2) -> any

    Compare schemas of two DBI databases.

    This function compares schemas of two DBI databases. You supply two
    "DBI" database handles and this function will return a hash:

     {
         # list of tables found in first db but missing in second
         deleted_tables => ['table1', ...],
 
         # list of tables found only in the second db
         added_tables => ['table2', ...],
 
         # list of modified tables, with details for each
         modified_tables => {
             table3 => {
                 deleted_columns => [...],
                 added_columns => [...],
                 modified_columns => {
                     column1 => {
                         old_type => '...',
                         new_type => '...',
                         ...
                     },
                 },
             },
         },
     }

    This function is not exported by default, but exportable.

    Arguments ('*' denotes required arguments):

    *   $dbh1* => *obj*

        DBI database handle for the first database.

    *   $dbh2* => *obj*

        DBI database handle for the second database.

    Return value: (any)

  diff_table_schema
    Usage:

     diff_table_schema($dbh1, $dbh2, $table1, $table2) -> any

    Compare schema of two DBI tables.

    This function compares schemas of two DBI tables. You supply two "DBI"
    database handles along with table name and this function will return a
    hash:

     {
         deleted_columns => [...],
         added_columns => [...],
         modified_columns => {
             column1 => {
                 old_type => '...',
                 new_type => '...',
                 ...
             },
         },
     }

    This function is not exported by default, but exportable.

    Arguments ('*' denotes required arguments):

    *   $dbh1* => *obj*

        DBI database handle for the first database.

    *   $dbh2* => *obj*

        DBI database handle for the second database.

    *   $table1* => *str*

        Table name.

    *   $table2 => *str*

        Second table name (assumed to be the same as first table name if
        unspecified).

    Return value: (any)

  table_schema_eq
    Usage:

     table_schema_eq($dbh1, $dbh2, $table1, $table2) -> any

    Return true if two DBI tables have the same schema.

    This is basically just a shortcut for:

     my $res = diff_table_schema(...);
     !%res;

    This function is not exported by default, but exportable.

    Arguments ('*' denotes required arguments):

    *   $dbh1* => *obj*

        DBI database handle for the first database.

    *   $dbh2* => *obj*

        DBI database handle for the second database.

    *   $table1* => *str*

        Table name.

    *   $table2 => *str*

        Second table name (assumed to be the same as first table name if
        unspecified).

    Return value: (any)

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/DBIx-Diff-Schema>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-DBIx-Diff-Schema>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=DBIx-Diff-Schema>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

SEE ALSO
    DBIx::Compare to compare database contents.

    diffdb from App::diffdb which can compare two database (schema as well
    as content) and display the result as the familiar colored unified-style
    diff.

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2020, 2018, 2017, 2015, 2014 by
    perlancar@cpan.org.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.

