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1 | package SQL::Translator::Parser::DBI; |
2 | |
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3 | =head1 NAME |
4 | |
5 | SQL::Translator::Parser::DBI - "parser" for DBI handles |
6 | |
7 | =head1 SYNOPSIS |
8 | |
9 | use DBI; |
10 | use SQL::Translator; |
11 | |
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12 | my $dbh = DBI->connect('dsn', 'user', 'pass', |
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13 | { |
14 | RaiseError => 1, |
15 | FetchHashKeyName => 'NAME_lc', |
16 | } |
17 | ); |
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18 | |
19 | my $translator = SQL::Translator->new( |
20 | parser => 'DBI', |
21 | dbh => $dbh, |
22 | ); |
23 | |
24 | Or: |
25 | |
26 | use SQL::Translator; |
27 | |
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28 | my $translator = SQL::Translator->new( |
29 | parser => 'DBI', |
30 | parser_args => { |
31 | dsn => 'dbi:mysql:FOO', |
32 | db_user => 'guest', |
33 | db_password => 'password', |
34 | } |
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35 | ); |
36 | |
37 | =head1 DESCRIPTION |
38 | |
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39 | This parser accepts an open database handle (or the arguments to create |
40 | one) and queries the database directly for the information. |
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41 | |
42 | The following are acceptable arguments: |
43 | |
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44 | =over 4 |
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45 | |
46 | =item * dbh |
47 | |
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48 | An open DBI database handle. NB: Be sure to create the database with the |
49 | "FetchHashKeyName => 'NAME_lc'" option as all the DBI parsers expect |
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50 | lowercased column names. |
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51 | |
52 | =item * dsn |
53 | |
54 | The DSN to use for connecting to a database. |
55 | |
56 | =item * db_user |
57 | |
58 | The user name to use for connecting to a database. |
59 | |
60 | =item * db_password |
61 | |
62 | The password to use for connecting to a database. |
63 | |
64 | =back |
65 | |
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66 | There is no need to specify which type of database you are querying as |
67 | this is determined automatically by inspecting $dbh->{'Driver'}{'Name'}. |
68 | If a parser exists for your database, it will be used automatically; |
69 | if not, the code will fail automatically (and you can write the parser |
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70 | and contribute it to the project!). |
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71 | |
72 | Currently parsers exist for the following databases: |
73 | |
74 | =over 4 |
75 | |
76 | =item * MySQL |
77 | |
78 | =item * SQLite |
79 | |
80 | =item * Sybase |
81 | |
82 | =item * PostgreSQL (still experimental) |
83 | |
84 | =back |
85 | |
86 | Most of these parsers are able to query the database directly for the |
87 | structure rather than parsing a text file. For large schemas, this is |
88 | probably orders of magnitude faster than traditional parsing (which |
89 | uses Parse::RecDescent, an amazing module but really quite slow). |
90 | |
91 | Though no Oracle parser currently exists, it would be fairly easy to |
92 | query an Oracle database directly by using DDL::Oracle to generate a |
93 | DDL for the schema and then using the normal Oracle parser on this. |
94 | Perhaps future versions of SQL::Translator will include the ability to |
95 | query Oracle directly and skip the parsing of a text file, too. |
96 | |
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97 | =cut |
98 | |
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99 | use strict; |
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100 | use warnings; |
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101 | use DBI; |
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102 | our @EXPORT; |
103 | our $VERSION = '1.59'; |
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104 | |
105 | use constant DRIVERS => { |
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106 | mysql => 'MySQL', |
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107 | odbc => 'SQLServer', |
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108 | oracle => 'Oracle', |
109 | pg => 'PostgreSQL', |
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110 | sqlite => 'SQLite', |
111 | sybase => 'Sybase', |
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112 | pg => 'PostgreSQL', |
113 | db2 => 'DB2', |
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114 | }; |
115 | |
116 | use Exporter; |
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117 | |
118 | use SQL::Translator::Utils qw(debug); |
119 | |
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120 | use base qw(Exporter); |
121 | @EXPORT = qw(parse); |
122 | |
123 | # |
124 | # Passed a SQL::Translator instance and a string containing the data |
125 | # |
126 | sub parse { |
127 | my ( $tr, $data ) = @_; |
128 | |
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129 | my $args = $tr->parser_args; |
130 | my $dbh = $args->{'dbh'}; |
131 | my $dsn = $args->{'dsn'}; |
132 | my $db_user = $args->{'db_user'}; |
133 | my $db_password = $args->{'db_password'}; |
134 | |
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135 | my $dbh_is_local; |
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136 | unless ( $dbh ) { |
137 | die 'No DSN' unless $dsn; |
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138 | $dbh = DBI->connect( $dsn, $db_user, $db_password, |
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139 | { |
140 | FetchHashKeyName => 'NAME_lc', |
141 | LongReadLen => 3000, |
142 | LongTruncOk => 1, |
143 | RaiseError => 1, |
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144 | } |
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145 | ); |
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146 | $dbh_is_local = 1; |
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147 | } |
148 | |
149 | die 'No database handle' unless defined $dbh; |
150 | |
151 | my $db_type = $dbh->{'Driver'}{'Name'} or die 'Cannot determine DBI type'; |
152 | my $driver = DRIVERS->{ lc $db_type } or die "$db_type not supported"; |
153 | my $pkg = "SQL::Translator::Parser::DBI::$driver"; |
154 | my $sub = $pkg.'::parse'; |
155 | |
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156 | SQL::Translator::load( $pkg ); |
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157 | |
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158 | my $s = eval { |
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159 | no strict 'refs'; |
160 | &{ $sub }( $tr, $dbh ) or die "No result from $pkg"; |
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161 | }; |
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162 | my $err = $@; |
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163 | |
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164 | eval { $dbh->disconnect } if (defined $dbh and $dbh_is_local); |
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165 | |
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166 | die $err if $err; |
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167 | |
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168 | return $s; |
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169 | } |
170 | |
171 | 1; |
172 | |
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173 | =pod |
174 | |
175 | =head1 AUTHOR |
176 | |
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177 | Ken Y. Clark E<lt>kclark@cpan.orgE<gt>. |
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178 | |
179 | =head1 SEE ALSO |
180 | |
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181 | DBI, SQL::Translator. |
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182 | |
183 | =cut |