summaryrefslogtreecommitdiff
path: root/framework/Db/schema/pgsql/TPgsqlSchema.php
blob: a539dce29071390a46267a872dd2f1e4f8634c15 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
<?php
/**
 * TPgsqlSchema class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2009 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

prado::using('System.db.schema.TDbSchema');

/**
 * TPgsqlSchema is the class for retrieving metadata information from a PostgreSQL database.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.db.schema.pgsql
 * @since 1.0
 */
class TPgsqlSchema extends TDbSchema
{
	const DEFAULT_SCHEMA='public';
	private $_sequences=array();

	/**
	 * Quotes a table name for use in a query.
	 * @param string table name
	 * @return string the properly quoted table name
	 */
	public function quoteTableName($name)
	{
		return '"'.$name.'"';
	}

	/**
	 * Creates a table instance representing the metadata for the named table.
	 * @return TDbTableSchema driver dependent table metadata.
	 */
	protected function createTable($name)
	{
		$table=new TPgsqlTableSchema;
		$this->resolveTableNames($table,$name);
		if(!$this->findColumns($table))
			return null;
		$this->findConstraints($table);

		if(is_string($table->primaryKey) && isset($this->_sequences[$table->primaryKey]))
			$table->sequenceName=$this->_sequences[$table->primaryKey];

		return $table;
	}

	/**
	 * Generates various kinds of table names.
	 * @param TPgsqlTableSchema the table instance
	 * @param string the unquoted table name
	 */
	protected function resolveTableNames($table,$name)
	{
		$parts=explode('.',str_replace('"','',$name));
		if(isset($parts[1]))
		{
			$schemaName=$parts[0];
			$tableName=$parts[1];
		}
		else
		{
			$schemaName=self::DEFAULT_SCHEMA;
			$tableName=$parts[0];
		}

		$table->name=$tableName;
		$table->schemaName=$schemaName;
		if($schemaName===self::DEFAULT_SCHEMA)
			$table->rawName=$this->quoteTableName($tableName);
		else
			$table->rawName=$this->quoteTableName($schemaName).'.'.$this->quoteTableName($tableName);
	}

	/**
	 * Collects the table column metadata.
	 * @param TPgsqlTableSchema the table metadata
	 * @return boolean whether the table exists in the database
	 */
	protected function findColumns($table)
	{
		$sql=<<<EOD
SELECT a.attname, LOWER(format_type(a.atttypid, a.atttypmod)) AS type, d.adsrc, a.attnotnull, a.atthasdef
FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attnum > 0 AND NOT a.attisdropped
	AND a.attrelid = (SELECT oid FROM pg_catalog.pg_class WHERE relname=:table
		AND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace WHERE nspname = :schema))
ORDER BY a.attnum
EOD;
		$command=$this->getDbConnection()->createCommand($sql);
		$command->bindValue(':table',$table->name);
		$command->bindValue(':schema',$table->schemaName);

		if(($columns=$command->queryAll())===array())
			return false;

		foreach($columns as $column)
		{
			$c=$this->createColumn($column);
			$table->columns[$c->name]=$c;

			if(stripos($column['adsrc'],'nextval')===0 && preg_match('/nextval\([^\']*\'([^\']+)\'[^\)]*\)/i',$column['adsrc'],$matches))
			{
				if(strpos($matches[1],'.')!==false || $table->schemaName===self::DEFAULT_SCHEMA)
					$this->_sequences[$c->name]=$matches[1];
				else
					$this->_sequences[$c->name]=$table->schemaName.'.'.$matches[1];
			}
		}
		return true;
	}

	/**
	 * Creates a table column.
	 * @param array column metadata
	 * @return TDbColumnSchema normalized column metadata
	 */
	protected function createColumn($column)
	{
		$c=new TPgsqlColumnSchema;
		$c->name=$column['attname'];
		$c->rawName=$this->quoteColumnName($c->name);
		$c->allowNull=!$column['attnotnull'];
		$c->isPrimaryKey=false;
		$c->isForeignKey=false;

		$c->init($column['type'],$column['atthasdef'] ? $column['adsrc'] : null);

		return $c;
	}

	/**
	 * Collects the primary and foreign key column details for the given table.
	 * @param TPgsqlTableSchema the table metadata
	 */
	protected function findConstraints($table)
	{
		$sql=<<<EOD
SELECT conname, consrc, contype, indkey FROM (
	SELECT
		conname,
		CASE WHEN contype='f' THEN
			pg_catalog.pg_get_constraintdef(oid)
		ELSE
			'CHECK (' || consrc || ')'
		END AS consrc,
		contype,
		conrelid AS relid,
		NULL AS indkey
	FROM
		pg_catalog.pg_constraint
	WHERE
		contype IN ('f', 'c')
	UNION ALL
	SELECT
		pc.relname,
		NULL,
		CASE WHEN indisprimary THEN
				'p'
		ELSE
				'u'
		END,
		pi.indrelid,
		indkey
	FROM
		pg_catalog.pg_class pc,
		pg_catalog.pg_index pi
	WHERE
		pc.oid=pi.indexrelid
		AND EXISTS (
			SELECT 1 FROM pg_catalog.pg_depend d JOIN pg_catalog.pg_constraint c
			ON (d.refclassid = c.tableoid AND d.refobjid = c.oid)
			WHERE d.classid = pc.tableoid AND d.objid = pc.oid AND d.deptype = 'i' AND c.contype IN ('u', 'p')
	)
) AS sub
WHERE relid = (SELECT oid FROM pg_catalog.pg_class WHERE relname=:table
	AND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace
	WHERE nspname=:schema))
EOD;
		$command=$this->getDbConnection()->createCommand($sql);
		$command->bindValue(':table',$table->name);
		$command->bindValue(':schema',$table->schemaName);
		foreach($command->queryAll() as $row)
		{
			if($row['contype']==='p') // primary key
				$this->findPrimaryKey($table,$row['indkey']);
			else if($row['contype']==='f') // foreign key
				$this->findForeignKey($table,$row['consrc']);
		}
	}

	/**
	 * Collects primary key information.
	 * @param TPgsqlTableSchema the table metadata
	 * @param string pgsql primary key index list
	 */
	protected function findPrimaryKey($table,$indices)
	{
		$indices=implode(', ',preg_split('/\s+/',$indices));
		$sql=<<<EOD
SELECT attnum, attname FROM pg_catalog.pg_attribute WHERE
	attrelid=(
		SELECT oid FROM pg_catalog.pg_class WHERE relname=:table AND relnamespace=(
			SELECT oid FROM pg_catalog.pg_namespace WHERE nspname=:schema
		)
	)
    AND attnum IN ({$indices})
EOD;
		$command=$this->getDbConnection()->createCommand($sql);
		$command->bindValue(':table',$table->name);
		$command->bindValue(':schema',$table->schemaName);
		foreach($command->queryAll() as $row)
		{
			$name=$row['attname'];
			if(isset($table->columns[$name]))
			{
				$table->columns[$name]->isPrimaryKey=true;
				if($table->primaryKey===null)
					$table->primaryKey=$name;
				else if(is_string($table->primaryKey))
					$table->primaryKey=array($table->primaryKey,$name);
				else
					$table->primaryKey[]=$name;
			}
		}
	}

	/**
	 * Collects foreign key information.
	 * @param TPgsqlTableSchema the table metadata
	 * @param string pgsql foreign key definition
	 */
	protected function findForeignKey($table,$src)
	{
		$matches=array();
		$brackets='\(([^\)]+)\)';
		$pattern="/FOREIGN\s+KEY\s+{$brackets}\s+REFERENCES\s+([^\(]+){$brackets}/i";
		if(preg_match($pattern,str_replace('"','',$src),$matches))
		{
			$keys=preg_split('/,\s+/', $matches[1]);
			$tableName=$matches[2];
			$fkeys=preg_split('/,\s+/', $matches[3]);
			foreach($keys as $i=>$key)
			{
				$table->foreignKeys[$key]=array($tableName,$fkeys[$i]);
				if(isset($table->columns[$key]))
					$table->columns[$key]->isForeignKey=true;
			}
		}
	}

	/**
	 * Returns all table names in the database.
	 * @return array all table names in the database.
	 * @since 1.0.2
	 */
	protected function findTableNames($schema='')
	{
		if($schema==='')
			$schema=self::DEFAULT_SCHEMA;
		$sql=<<<EOD
SELECT table_name, table_schema FROM information_schema.tables
WHERE table_schema=:schema
EOD;
		$command=$this->getDbConnection()->createCommand($sql);
		$command->bindParam(':schema',$schema);
		$rows=$command->queryAll();
		$names=array();
		foreach($rows as $row)
		{
			if($schema===self::DEFAULT_SCHEMA)
				$names[]=$row['table_name'];
			else
				$names[]=$row['schema_name'].'.'.$row['table_name'];
		}
		return $names;
	}
}