MediaWiki  master
PostgresField.php
Go to the documentation of this file.
1 <?php
2 
3 namespace Wikimedia\Rdbms;
4 
5 class PostgresField implements Field {
8 
15  static function fromText( DatabasePostgres $db, $table, $field ) {
16  $q = <<<SQL
17 SELECT
18  attnotnull, attlen, conname AS conname,
19  atthasdef,
20  pg_get_expr(adbin, adrelid) AS adsrc,
21  COALESCE(condeferred, 'f') AS deferred,
22  COALESCE(condeferrable, 'f') AS deferrable,
23  CASE WHEN typname = 'int2' THEN 'smallint'
24  WHEN typname = 'int4' THEN 'integer'
25  WHEN typname = 'int8' THEN 'bigint'
26  WHEN typname = 'bpchar' THEN 'char'
27  ELSE typname END AS typname
28 FROM pg_class c
29 JOIN pg_namespace n ON (n.oid = c.relnamespace)
30 JOIN pg_attribute a ON (a.attrelid = c.oid)
31 JOIN pg_type t ON (t.oid = a.atttypid)
32 LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
33 LEFT JOIN pg_attrdef d on c.oid=d.adrelid and a.attnum=d.adnum
34 WHERE relkind = 'r'
35 AND nspname=%s
36 AND relname=%s
37 AND attname=%s;
38 SQL;
39 
40  $table = $db->remappedTableName( $table );
41  foreach ( $db->getCoreSchemas() as $schema ) {
42  $res = $db->query(
43  sprintf( $q,
44  $db->addQuotes( $schema ),
45  $db->addQuotes( $table ),
46  $db->addQuotes( $field )
47  )
48  );
49  $row = $db->fetchObject( $res );
50  if ( !$row ) {
51  continue;
52  }
53  $n = new PostgresField;
54  $n->type = $row->typname;
55  $n->nullable = ( $row->attnotnull == 'f' );
56  $n->name = $field;
57  $n->tablename = $table;
58  $n->max_length = $row->attlen;
59  $n->deferrable = ( $row->deferrable == 't' );
60  $n->deferred = ( $row->deferred == 't' );
61  $n->conname = $row->conname;
62  $n->has_default = ( $row->atthasdef === 't' );
63  $n->default = $row->adsrc;
64 
65  return $n;
66  }
67 
68  return null;
69  }
70 
71  function name() {
72  return $this->name;
73  }
74 
75  function tableName() {
76  return $this->tablename;
77  }
78 
79  function type() {
80  return $this->type;
81  }
82 
83  function isNullable() {
84  return $this->nullable;
85  }
86 
87  function maxLength() {
88  return $this->max_length;
89  }
90 
91  function is_deferrable() {
92  return $this->deferrable;
93  }
94 
95  function is_deferred() {
96  return $this->deferred;
97  }
98 
99  function conname() {
100  return $this->conname;
101  }
102 
107  function defaultValue() {
108  if ( $this->has_default ) {
109  return $this->default;
110  } else {
111  return false;
112  }
113  }
114 }
as see the revision history and available at free of to any person obtaining a copy of this software and associated documentation to deal in the Software without including without limitation the rights to and or sell copies of the and to permit persons to whom the Software is furnished to do subject to the following WITHOUT WARRANTY OF ANY EXPRESS OR INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY DAMAGES OR OTHER WHETHER IN AN ACTION OF TORT OR ARISING FROM
Definition: LICENSE.txt:10
addQuotes( $s)
Adds quotes and backslashes.
query( $sql, $fname=__METHOD__, $flags=0)
Run an SQL query and return the result.
Definition: Database.php:1191
getCoreSchemas()
Return schema names for temporary tables and core application tables.
Base for all database-specific classes representing information about database fields.
Definition: Field.php:9
$res
Definition: database.txt:21
and(b) You must cause any modified files to carry prominent notices stating that You changed the files
this hook is for auditing only or null if authentication failed before getting that far or null if we can t even determine that When $user is not null
Definition: hooks.txt:780
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such as
Definition: distributors.txt:9
fetchObject( $res)
Fetch the next row from the given result object, in object form.
static fromText(DatabasePostgres $db, $table, $field)
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition: injection.txt:35
Using a hook running we can avoid having all this option specific stuff in our mainline code Using the function We ve cleaned up the code here by removing clumps of infrequently used code and moving them off somewhere else It s much easier for someone working with this code to see what s _really_ going on
Definition: hooks.txt:77
tableName()
Name of table this field belongs to.
while(( $__line=Maintenance::readconsole()) !==false) print n
Definition: eval.php:64
isNullable()
Whether this field can store NULL values.