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1 | package SQL::Translator::Parser::DBI::PostgreSQL; |
2 | |
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3 | =head1 NAME |
4 | |
5 | SQL::Translator::Parser::DBI::PostgreSQL - parser for DBD::Pg |
6 | |
7 | =head1 SYNOPSIS |
8 | |
9 | See SQL::Translator::Parser::DBI. |
10 | |
11 | =head1 DESCRIPTION |
12 | |
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13 | Uses DBI to query PostgreSQL system tables to determine schema structure. |
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14 | |
15 | =cut |
16 | |
17 | use strict; |
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18 | use warnings; |
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19 | use DBI; |
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20 | use Data::Dumper; |
21 | use SQL::Translator::Schema::Constants; |
22 | |
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23 | our ( $DEBUG, @EXPORT_OK ); |
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24 | our $VERSION = '1.59_01'; |
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25 | $DEBUG = 0 unless defined $DEBUG; |
26 | |
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27 | my $actions = {c => 'cascade', |
28 | r => 'restrict', |
29 | a => 'no action', |
30 | n => 'set null', |
31 | d => 'set default', |
32 | }; |
33 | |
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34 | sub parse { |
35 | my ( $tr, $dbh ) = @_; |
36 | |
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37 | my $schema = $tr->schema; |
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38 | |
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39 | my $column_select = $dbh->prepare( |
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40 | "SELECT a.attname, format_type(t.oid, a.atttypmod) as typname, a.attnum, |
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41 | a.atttypmod as length, a.attnotnull, a.atthasdef, ad.adsrc, |
42 | d.description |
43 | FROM pg_type t, pg_attribute a |
44 | LEFT JOIN pg_attrdef ad ON (ad.adrelid = a.attrelid AND a.attnum = ad.adnum) |
45 | LEFT JOIN pg_description d ON (a.attrelid=d.objoid AND a.attnum=d.objsubid) |
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46 | WHERE a.attrelid=? AND attnum>0 |
47 | AND a.atttypid=t.oid |
48 | ORDER BY a.attnum" |
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49 | ); |
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50 | |
51 | my $index_select = $dbh->prepare( |
52 | "SELECT oid, c.relname, i.indkey, i.indnatts, i.indisunique, |
53 | i.indisprimary, pg_get_indexdef(oid) AS create_string |
54 | FROM pg_class c,pg_index i |
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55 | WHERE c.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname='public') AND c.relkind='i' |
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56 | AND c.oid=i.indexrelid AND i.indrelid=?" |
57 | ); |
58 | |
59 | my $table_select = $dbh->prepare( |
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60 | "SELECT c.oid, c.relname, d.description |
61 | FROM pg_class c |
62 | LEFT JOIN pg_description d ON c.oid=d.objoid AND d.objsubid=0 |
63 | WHERE relnamespace IN |
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64 | (SELECT oid FROM pg_namespace WHERE nspname='public') |
65 | AND relkind='r';" |
66 | ); |
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67 | |
68 | my $fk_select = $dbh->prepare( |
69 | q/ |
70 | SELECT r.conname, |
71 | c.relname, |
72 | d.relname AS frelname, |
73 | r.conkey, |
74 | ARRAY(SELECT column_name::varchar |
75 | FROM information_schema.columns |
76 | WHERE ordinal_position = ANY (r.conkey) |
77 | AND table_schema = n.nspname |
78 | AND table_name = c.relname ) AS fields, |
79 | r.confkey, |
80 | ARRAY(SELECT column_name::varchar |
81 | FROM information_schema.columns |
82 | WHERE ordinal_position = ANY (r.confkey) |
83 | AND table_schema = n.nspname |
84 | AND table_name = d.relname ) AS reference_fields, |
85 | r.confupdtype, |
86 | r.confdeltype, |
87 | r.confmatchtype |
88 | |
89 | FROM pg_catalog.pg_constraint r |
90 | |
91 | JOIN pg_catalog.pg_class c |
92 | ON c.oid = r.conrelid |
93 | AND r.contype = 'f' |
94 | |
95 | JOIN pg_catalog.pg_class d |
96 | ON d.oid = r.confrelid |
97 | |
98 | JOIN pg_catalog.pg_namespace n |
99 | ON n.oid = c.relnamespace |
100 | |
101 | WHERE pg_catalog.pg_table_is_visible(c.oid) |
102 | AND n.nspname = ? |
103 | AND c.relname = ? |
104 | ORDER BY 1; |
105 | /) or die "Can't prepare: $@"; |
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106 | |
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107 | $table_select->execute(); |
108 | |
109 | while ( my $tablehash = $table_select->fetchrow_hashref ) { |
110 | |
111 | my $table_name = $$tablehash{'relname'}; |
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112 | my $table_oid = $$tablehash{'oid'}; |
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113 | my $table = $schema->add_table( |
114 | name => $table_name, |
115 | #what is type? type => $table_info->{TABLE_TYPE}, |
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116 | ) || die $schema->error; |
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117 | |
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118 | $table->comments($$tablehash{'description'}) if $$tablehash{'description'}; |
119 | |
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120 | $column_select->execute($table_oid); |
121 | |
122 | while (my $columnhash = $column_select->fetchrow_hashref ) { |
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123 | |
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124 | #data_type seems to not be populated; perhaps there needs to |
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125 | #be a mapping of query output to reserved constants in sqlt? |
126 | |
127 | my $col = $table->add_field( |
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128 | name => $$columnhash{'attname'}, |
129 | default_value => $$columnhash{'adsrc'}, |
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130 | data_type => $$columnhash{'typname'}, |
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131 | order => $$columnhash{'attnum'}, |
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132 | ) || die $table->error; |
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133 | |
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134 | $col->{size} = [$$columnhash{'length'}] |
135 | if $$columnhash{'length'}>0 && $$columnhash{'length'}<=0xFFFF; |
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136 | $col->{is_nullable} = $$columnhash{'attnotnull'} ? 0 : 1; |
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137 | $col->comments($$columnhash{'description'}) if $$columnhash{'description'}; |
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138 | } |
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139 | |
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140 | $index_select->execute($table_oid); |
141 | |
142 | my @column_names = $table->field_names(); |
143 | while (my $indexhash = $index_select->fetchrow_hashref ) { |
144 | #don't deal with function indexes at the moment |
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145 | next if ($$indexhash{'indkey'} eq '' |
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146 | or !defined($$indexhash{'indkey'}) ); |
147 | |
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148 | my @columns = map $column_names[$_ - 1], split /\s+/, $$indexhash{'indkey'}; |
149 | |
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150 | my $type; |
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151 | if ($$indexhash{'indisprimary'}) { |
152 | $type = UNIQUE; #PRIMARY_KEY; |
153 | |
154 | #tell sqlt that this is the primary key: |
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155 | for my $column (@columns) { |
156 | $table->get_field($column)->{is_primary_key}=1; |
157 | } |
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158 | |
159 | } elsif ($$indexhash{'indisunique'}) { |
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160 | $type = UNIQUE; |
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161 | } else { |
162 | $type = NORMAL; |
163 | } |
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164 | |
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165 | |
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166 | $table->add_index( |
167 | name => $$indexhash{'relname'}, |
168 | type => $type, |
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169 | fields => \@columns, |
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170 | ) || die $table->error; |
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171 | } |
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172 | |
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173 | $fk_select->execute('public',$table_name) or die "Can't execute: $@"; |
174 | my $fkeys = $fk_select->fetchall_arrayref({}); |
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175 | $DEBUG and print Dumper $fkeys; |
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176 | for my $con (@$fkeys){ |
177 | my $con_name = $con->{conname}; |
178 | my $fields = $con->{fields}; |
179 | my $reference_fields = $con->{reference_fields}; |
180 | my $reference_table = $con->{frelname}; |
181 | my $on_upd = $con->{confupdtype}; |
182 | my $on_del = $con->{confdeltype}; |
183 | $table->add_constraint( |
184 | name => $con_name, |
185 | type => 'foreign_key', |
186 | fields => $fields, |
187 | reference_fields => $reference_fields, |
188 | reference_table => $reference_table, |
189 | on_delete => $actions->{$on_upd}, |
190 | on_update => $actions->{$on_del}, |
191 | ); |
192 | } |
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193 | } |
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194 | |
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195 | |
196 | return 1; |
197 | } |
198 | |
199 | 1; |
200 | |
201 | # ------------------------------------------------------------------- |
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202 | # Time is a waste of money. |
203 | # Oscar Wilde |
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204 | # ------------------------------------------------------------------- |
205 | |
206 | =pod |
207 | |
208 | =head1 AUTHOR |
209 | |
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210 | Scott Cain E<lt>cain@cshl.eduE<gt>, previous author: |
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211 | Paul Harrington E<lt>harringp@deshaw.comE<gt>. |
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212 | |
213 | =head1 SEE ALSO |
214 | |
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215 | SQL::Translator, DBD::Pg. |
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216 | |
217 | =cut |