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1 | package SQL::Translator::Parser::DBI; |
2 | |
3 | # ------------------------------------------------------------------- |
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4 | # $Id: DBI.pm,v 1.10 2006-05-24 18:08:41 duality72 Exp $ |
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5 | # ------------------------------------------------------------------- |
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6 | # Copyright (C) 2002-4 SQLFairy Authors |
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7 | # |
8 | # This program is free software; you can redistribute it and/or |
9 | # modify it under the terms of the GNU General Public License as |
10 | # published by the Free Software Foundation; version 2. |
11 | # |
12 | # This program is distributed in the hope that it will be useful, but |
13 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | # General Public License for more details. |
16 | # |
17 | # You should have received a copy of the GNU General Public License |
18 | # along with this program; if not, write to the Free Software |
19 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
20 | # 02111-1307 USA |
21 | # ------------------------------------------------------------------- |
22 | |
23 | =head1 NAME |
24 | |
25 | SQL::Translator::Parser::DBI - "parser" for DBI handles |
26 | |
27 | =head1 SYNOPSIS |
28 | |
29 | use DBI; |
30 | use SQL::Translator; |
31 | |
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32 | my $dbh = DBI->connect('dsn', 'user', 'pass', |
33 | { |
34 | RaiseError => 1, |
35 | FetchHashKeyName => 'NAME_lc', |
36 | } |
37 | ); |
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38 | |
39 | my $translator = SQL::Translator->new( |
40 | parser => 'DBI', |
41 | dbh => $dbh, |
42 | ); |
43 | |
44 | Or: |
45 | |
46 | use SQL::Translator; |
47 | |
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48 | my $translator = SQL::Translator->new( |
49 | parser => 'DBI', |
50 | parser_args => { |
51 | dsn => 'dbi:mysql:FOO', |
52 | db_user => 'guest', |
53 | db_password => 'password', |
54 | } |
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55 | ); |
56 | |
57 | =head1 DESCRIPTION |
58 | |
59 | This parser accepts an open database handle (or the arguments to create |
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60 | one) and queries the database directly for the information. |
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61 | |
62 | The following are acceptable arguments: |
63 | |
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64 | =over 4 |
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65 | |
66 | =item * dbh |
67 | |
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68 | An open DBI database handle. NB: Be sure to create the database with the |
69 | "FetchHashKeyName => 'NAME_lc'" option as all the DBI parsers expect |
70 | lowercased column names. |
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71 | |
72 | =item * dsn |
73 | |
74 | The DSN to use for connecting to a database. |
75 | |
76 | =item * db_user |
77 | |
78 | The user name to use for connecting to a database. |
79 | |
80 | =item * db_password |
81 | |
82 | The password to use for connecting to a database. |
83 | |
84 | =back |
85 | |
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86 | There is no need to specify which type of database you are querying as |
87 | this is determined automatically by inspecting $dbh->{'Driver'}{'Name'}. |
88 | If a parser exists for your database, it will be used automatically; |
89 | if not, the code will fail automatically (and you can write the parser |
90 | and contribute it to the project!). |
91 | |
92 | Currently parsers exist for the following databases: |
93 | |
94 | =over 4 |
95 | |
96 | =item * MySQL |
97 | |
98 | =item * SQLite |
99 | |
100 | =item * Sybase |
101 | |
102 | =item * PostgreSQL (still experimental) |
103 | |
104 | =back |
105 | |
106 | Most of these parsers are able to query the database directly for the |
107 | structure rather than parsing a text file. For large schemas, this is |
108 | probably orders of magnitude faster than traditional parsing (which |
109 | uses Parse::RecDescent, an amazing module but really quite slow). |
110 | |
111 | Though no Oracle parser currently exists, it would be fairly easy to |
112 | query an Oracle database directly by using DDL::Oracle to generate a |
113 | DDL for the schema and then using the normal Oracle parser on this. |
114 | Perhaps future versions of SQL::Translator will include the ability to |
115 | query Oracle directly and skip the parsing of a text file, too. |
116 | |
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117 | =cut |
118 | |
119 | # ------------------------------------------------------------------- |
120 | |
121 | use strict; |
122 | use DBI; |
123 | use vars qw($VERSION @EXPORT); |
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124 | $VERSION = sprintf "%d.%02d", q$Revision: 1.10 $ =~ /(\d+)\.(\d+)/; |
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125 | |
126 | use constant DRIVERS => { |
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127 | mysql => 'MySQL', |
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128 | odbc => 'SQLServer', |
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129 | oracle => 'Oracle', |
130 | pg => 'PostgreSQL', |
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131 | sqlite => 'SQLite', |
132 | sybase => 'Sybase', |
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133 | pg => 'PostgreSQL', |
134 | db2 => 'DB2', |
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135 | }; |
136 | |
137 | use Exporter; |
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138 | |
139 | use SQL::Translator::Utils qw(debug); |
140 | |
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141 | use base qw(Exporter); |
142 | @EXPORT = qw(parse); |
143 | |
144 | # |
145 | # Passed a SQL::Translator instance and a string containing the data |
146 | # |
147 | sub parse { |
148 | my ( $tr, $data ) = @_; |
149 | |
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150 | my $args = $tr->parser_args; |
151 | my $dbh = $args->{'dbh'}; |
152 | my $dsn = $args->{'dsn'}; |
153 | my $db_user = $args->{'db_user'}; |
154 | my $db_password = $args->{'db_password'}; |
155 | |
156 | unless ( $dbh ) { |
157 | die 'No DSN' unless $dsn; |
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158 | $dbh = DBI->connect( $dsn, $db_user, $db_password, |
159 | { |
160 | FetchHashKeyName => 'NAME_lc', |
161 | LongReadLen => 3000, |
162 | LongTruncOk => 1, |
163 | RaiseError => 1, |
164 | } |
165 | ); |
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166 | } |
167 | |
168 | die 'No database handle' unless defined $dbh; |
169 | |
170 | my $db_type = $dbh->{'Driver'}{'Name'} or die 'Cannot determine DBI type'; |
171 | my $driver = DRIVERS->{ lc $db_type } or die "$db_type not supported"; |
172 | my $pkg = "SQL::Translator::Parser::DBI::$driver"; |
173 | my $sub = $pkg.'::parse'; |
174 | |
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175 | $tr->load( $pkg ); |
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176 | |
177 | eval { |
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178 | no strict 'refs'; |
179 | &{ $sub }( $tr, $dbh ) or die "No result from $pkg"; |
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180 | }; |
181 | |
182 | $dbh->disconnect if defined $dbh; |
183 | |
184 | die $@ if $@; |
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185 | |
186 | return 1; |
187 | } |
188 | |
189 | 1; |
190 | |
191 | # ------------------------------------------------------------------- |
192 | =pod |
193 | |
194 | =head1 AUTHOR |
195 | |
196 | Ken Y. Clark E<lt>kclark@cpan.orgE<gt>. |
197 | |
198 | =head1 SEE ALSO |
199 | |
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200 | DBI, SQL::Translator. |
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201 | |
202 | =cut |