Class::DBI::mysql(3pm)

1Class::DBI::mysql(3)  User Contributed Perl Documentation Class::DBI::mysql(3)
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NAME

6       Class::DBI::mysql - Extensions to Class::DBI for MySQL
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SYNOPSIS

9         package Film;
10         use base 'Class::DBI::mysql';
11         __PACKAGE__->set_db('Main', 'dbi:mysql:dbname', 'user', 'password');
12         __PACKAGE__->set_up_table("film");
13
14         __PACKAGE__->autoinflate(dates => 'Time::Piece');
15
16         # Somewhere else ...
17
18         my $type = $class->column_type('column_name');
19         my @allowed = $class->enum_vals('column_name');
20
21         my $tonights_viewing  = Film->retrieve_random;
22

DESCRIPTION

24       This is an extension to Class::DBI, containing several functions and
25       optimisations for the MySQL database. Instead of setting Class::DBI as
26       your base class, use this instead.
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METHODS

29   set_up_table
30               __PACKAGE__->set_up_table("table_name");
31
32       Traditionally, to use Class::DBI, you have to set up the columns:
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34               __PACKAGE__->columns(All => qw/list of columns/);
35               __PACKAGE__->columns(Primary => 'column_name');
36
37       Whilst this allows for more flexibility if you're going to arrange your
38       columns into a variety of groupings, sometimes you just want to create
39       the 'all columns' list. Well, this information is really simple to
40       extract from MySQL itself, so why not just use that?
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42       This call will extract the list of all the columns, and the primary key
43       and set them up for you. It will die horribly if the table contains no
44       primary key, or has a composite primary key.
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46   autoinflate
47         __PACKAGE__->autoinflate(column_type => 'Inflation::Class');
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49         __PACKAGE__->autoinflate(timestamp => 'Time::Piece');
50         __PACKAGE__->autoinflate(dates => 'Time::Piece');
51
52       This will automatically set up has_a() relationships for all columns of
53       the specified type to the given class.
54
55       We currently assume that all classess passed will be able to inflate
56       and deflate without needing extra has_a arguments, with the example of
57       Time::Piece objects, which we deal with using Time::Piece::mysql (which
58       you'll have to have installed!).
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60       The special type 'dates' will autoinflate all columns of type date,
61       datetime or timestamp.
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63   create_table
64               $class->create_table(q{
65                       name    VARCHAR(40)     NOT NULL PRIMARY KEY,
66                       rank    VARCHAR(20)     NOT NULL DEFAULT 'Private',
67                       serial  INTEGER         NOT NULL
68               });
69
70       This creates the table for the class, with the given schema. If the
71       table already exists we do nothing.
72
73       A typical use would be:
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75               Music::CD->table('cd');
76               Music::CD->create_table(q{
77                 cdid   MEDIUMINT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,
78                 artist MEDIUMINT UNSIGNED NOT NULL,
79                       title  VARCHAR(255),
80                       year   YEAR,
81                       INDEX (artist),
82                       INDEX (title)
83               });
84               Music::CD->set_up_table;
85
86   drop_table
87               $class->drop_table;
88
89       Drops the table for this class, if it exists.
90
91   column_type
92               my $type = $class->column_type('column_name');
93
94       This returns the 'type' of this table (VARCHAR(20), BIGINT, etc.)
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96   enum_vals
97               my @allowed = $class->enum_vals('column_name');
98
99       This returns a list of the allowable values for an ENUM column.
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101   retrieve_random
102               my $film = Film->retrieve_random;
103
104       This will select a random row from the database, and return you the
105       relevant object.
106
107       (MySQL 3.23 and higher only, at this point)
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AUTHOR

113       Tony Bowden
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BUGS and QUERIES

116       Please direct all correspondence regarding this module to:
117         bug-Class-DBI-mysql@rt.cpan.org
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COPYRIGHT AND LICENSE

120         Copyright (C) 2001-2005 Tony Bowden.
121
122         This program is free software; you can redistribute it and/or modify it under
123         the terms of the GNU General Public License; either version 2 of the License,
124         or (at your option) any later version.
125
126         This program is distributed in the hope that it will be useful, but WITHOUT
127         ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
128         FOR A PARTICULAR PURPOSE.
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132perl v5.34.0                      2022-01-21              Class::DBI::mysql(3)