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  1: <?php
  2: /**
  3:  * Zend Framework
  4:  *
  5:  * LICENSE
  6:  *
  7:  * This source file is subject to the new BSD license that is bundled
  8:  * with this package in the file LICENSE.txt.
  9:  * It is also available through the world-wide-web at this URL:
 10:  * http://framework.zend.com/license/new-bsd
 11:  * If you did not receive a copy of the license and are unable to
 12:  * obtain it through the world-wide-web, please send an email
 13:  * to license@zend.com so we can send you a copy immediately.
 14:  *
 15:  * @category   Zend
 16:  * @package    Zend_Db
 17:  * @subpackage Adapter
 18:  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 19:  * @license    http://framework.zend.com/license/new-bsd     New BSD License
 20:  * @version    $Id: Pgsql.php 22788 2010-08-03 18:29:55Z ramon $
 21:  */
 22: 
 23: 
 24: /**
 25:  * @see Zend_Db_Adapter_Pdo_Abstract
 26:  */
 27: require_once 'Zend/Db/Adapter/Pdo/Abstract.php';
 28: 
 29: 
 30: /**
 31:  * Class for connecting to PostgreSQL databases and performing common operations.
 32:  *
 33:  * @category   Zend
 34:  * @package    Zend_Db
 35:  * @subpackage Adapter
 36:  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 37:  * @license    http://framework.zend.com/license/new-bsd     New BSD License
 38:  */
 39: class Zend_Db_Adapter_Pdo_Pgsql extends Zend_Db_Adapter_Pdo_Abstract
 40: {
 41: 
 42:     /**
 43:      * PDO type.
 44:      *
 45:      * @var string
 46:      */
 47:     protected $_pdoType = 'pgsql';
 48: 
 49:     /**
 50:      * Keys are UPPERCASE SQL datatypes or the constants
 51:      * Zend_Db::INT_TYPE, Zend_Db::BIGINT_TYPE, or Zend_Db::FLOAT_TYPE.
 52:      *
 53:      * Values are:
 54:      * 0 = 32-bit integer
 55:      * 1 = 64-bit integer
 56:      * 2 = float or decimal
 57:      *
 58:      * @var array Associative array of datatypes to values 0, 1, or 2.
 59:      */
 60:     protected $_numericDataTypes = array(
 61:         Zend_Db::INT_TYPE    => Zend_Db::INT_TYPE,
 62:         Zend_Db::BIGINT_TYPE => Zend_Db::BIGINT_TYPE,
 63:         Zend_Db::FLOAT_TYPE  => Zend_Db::FLOAT_TYPE,
 64:         'INTEGER'            => Zend_Db::INT_TYPE,
 65:         'SERIAL'             => Zend_Db::INT_TYPE,
 66:         'SMALLINT'           => Zend_Db::INT_TYPE,
 67:         'BIGINT'             => Zend_Db::BIGINT_TYPE,
 68:         'BIGSERIAL'          => Zend_Db::BIGINT_TYPE,
 69:         'DECIMAL'            => Zend_Db::FLOAT_TYPE,
 70:         'DOUBLE PRECISION'   => Zend_Db::FLOAT_TYPE,
 71:         'NUMERIC'            => Zend_Db::FLOAT_TYPE,
 72:         'REAL'               => Zend_Db::FLOAT_TYPE
 73:     );
 74: 
 75:     /**
 76:      * Creates a PDO object and connects to the database.
 77:      *
 78:      * @return void
 79:      * @throws Zend_Db_Adapter_Exception
 80:      */
 81:     protected function _connect()
 82:     {
 83:         if ($this->_connection) {
 84:             return;
 85:         }
 86: 
 87:         parent::_connect();
 88: 
 89:         if (!empty($this->_config['charset'])) {
 90:             $sql = "SET NAMES '" . $this->_config['charset'] . "'";
 91:             $this->_connection->exec($sql);
 92:         }
 93:     }
 94: 
 95:     /**
 96:      * Returns a list of the tables in the database.
 97:      *
 98:      * @return array
 99:      */
100:     public function listTables()
101:     {
102:         // @todo use a better query with joins instead of subqueries
103:         $sql = "SELECT c.relname AS table_name "
104:              . "FROM pg_class c, pg_user u "
105:              . "WHERE c.relowner = u.usesysid AND c.relkind = 'r' "
106:              . "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
107:              . "AND c.relname !~ '^(pg_|sql_)' "
108:              . "UNION "
109:              . "SELECT c.relname AS table_name "
110:              . "FROM pg_class c "
111:              . "WHERE c.relkind = 'r' "
112:              . "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
113:              . "AND NOT EXISTS (SELECT 1 FROM pg_user WHERE usesysid = c.relowner) "
114:              . "AND c.relname !~ '^pg_'";
115: 
116:         return $this->fetchCol($sql);
117:     }
118: 
119:     /**
120:      * Returns the column descriptions for a table.
121:      *
122:      * The return value is an associative array keyed by the column name,
123:      * as returned by the RDBMS.
124:      *
125:      * The value of each array element is an associative array
126:      * with the following keys:
127:      *
128:      * SCHEMA_NAME      => string; name of database or schema
129:      * TABLE_NAME       => string;
130:      * COLUMN_NAME      => string; column name
131:      * COLUMN_POSITION  => number; ordinal position of column in table
132:      * DATA_TYPE        => string; SQL datatype name of column
133:      * DEFAULT          => string; default expression of column, null if none
134:      * NULLABLE         => boolean; true if column can have nulls
135:      * LENGTH           => number; length of CHAR/VARCHAR
136:      * SCALE            => number; scale of NUMERIC/DECIMAL
137:      * PRECISION        => number; precision of NUMERIC/DECIMAL
138:      * UNSIGNED         => boolean; unsigned property of an integer type
139:      * PRIMARY          => boolean; true if column is part of the primary key
140:      * PRIMARY_POSITION => integer; position of column in primary key
141:      * IDENTITY         => integer; true if column is auto-generated with unique values
142:      *
143:      * @todo Discover integer unsigned property.
144:      *
145:      * @param  string $tableName
146:      * @param  string $schemaName OPTIONAL
147:      * @return array
148:      */
149:     public function describeTable($tableName, $schemaName = null)
150:     {
151:         $sql = "SELECT
152:                 a.attnum,
153:                 n.nspname,
154:                 c.relname,
155:                 a.attname AS colname,
156:                 t.typname AS type,
157:                 a.atttypmod,
158:                 FORMAT_TYPE(a.atttypid, a.atttypmod) AS complete_type,
159:                 d.adsrc AS default_value,
160:                 a.attnotnull AS notnull,
161:                 a.attlen AS length,
162:                 co.contype,
163:                 ARRAY_TO_STRING(co.conkey, ',') AS conkey
164:             FROM pg_attribute AS a
165:                 JOIN pg_class AS c ON a.attrelid = c.oid
166:                 JOIN pg_namespace AS n ON c.relnamespace = n.oid
167:                 JOIN pg_type AS t ON a.atttypid = t.oid
168:                 LEFT OUTER JOIN pg_constraint AS co ON (co.conrelid = c.oid
169:                     AND a.attnum = ANY(co.conkey) AND co.contype = 'p')
170:                 LEFT OUTER JOIN pg_attrdef AS d ON d.adrelid = c.oid AND d.adnum = a.attnum
171:             WHERE a.attnum > 0 AND c.relname = ".$this->quote($tableName);
172:         if ($schemaName) {
173:             $sql .= " AND n.nspname = ".$this->quote($schemaName);
174:         }
175:         $sql .= ' ORDER BY a.attnum';
176: 
177:         $stmt = $this->query($sql);
178: 
179:         // Use FETCH_NUM so we are not dependent on the CASE attribute of the PDO connection
180:         $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
181: 
182:         $attnum        = 0;
183:         $nspname       = 1;
184:         $relname       = 2;
185:         $colname       = 3;
186:         $type          = 4;
187:         $atttypemod    = 5;
188:         $complete_type = 6;
189:         $default_value = 7;
190:         $notnull       = 8;
191:         $length        = 9;
192:         $contype       = 10;
193:         $conkey        = 11;
194: 
195:         $desc = array();
196:         foreach ($result as $key => $row) {
197:             $defaultValue = $row[$default_value];
198:             if ($row[$type] == 'varchar' || $row[$type] == 'bpchar' ) {
199:                 if (preg_match('/character(?: varying)?(?:\((\d+)\))?/', $row[$complete_type], $matches)) {
200:                     if (isset($matches[1])) {
201:                         $row[$length] = $matches[1];
202:                     } else {
203:                         $row[$length] = null; // unlimited
204:                     }
205:                 }
206:                 if (preg_match("/^'(.*?)'::(?:character varying|bpchar)$/", $defaultValue, $matches)) {
207:                     $defaultValue = $matches[1];
208:                 }
209:             }
210:             list($primary, $primaryPosition, $identity) = array(false, null, false);
211:             if ($row[$contype] == 'p') {
212:                 $primary = true;
213:                 $primaryPosition = array_search($row[$attnum], explode(',', $row[$conkey])) + 1;
214:                 $identity = (bool) (preg_match('/^nextval/', $row[$default_value]));
215:             }
216:             $desc[$this->foldCase($row[$colname])] = array(
217:                 'SCHEMA_NAME'      => $this->foldCase($row[$nspname]),
218:                 'TABLE_NAME'       => $this->foldCase($row[$relname]),
219:                 'COLUMN_NAME'      => $this->foldCase($row[$colname]),
220:                 'COLUMN_POSITION'  => $row[$attnum],
221:                 'DATA_TYPE'        => $row[$type],
222:                 'DEFAULT'          => $defaultValue,
223:                 'NULLABLE'         => (bool) ($row[$notnull] != 't'),
224:                 'LENGTH'           => $row[$length],
225:                 'SCALE'            => null, // @todo
226:                 'PRECISION'        => null, // @todo
227:                 'UNSIGNED'         => null, // @todo
228:                 'PRIMARY'          => $primary,
229:                 'PRIMARY_POSITION' => $primaryPosition,
230:                 'IDENTITY'         => $identity
231:             );
232:         }
233:         return $desc;
234:     }
235: 
236: 
237:     /**
238:      * Adds an adapter-specific LIMIT clause to the SELECT statement.
239:      *
240:      * @param string $sql
241:      * @param integer $count
242:      * @param integer $offset OPTIONAL
243:      * @return string
244:      */
245:     public function limit($sql, $count, $offset = 0)
246:     {
247:         $count = intval($count);
248:         if ($count <= 0) {
249:             /**
250:              * @see Zend_Db_Adapter_Exception
251:              */
252:             require_once 'Zend/Db/Adapter/Exception.php';
253:             throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
254:         }
255: 
256:         $offset = intval($offset);
257:         if ($offset < 0) {
258:             /**
259:              * @see Zend_Db_Adapter_Exception
260:              */
261:             require_once 'Zend/Db/Adapter/Exception.php';
262:             throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
263:         }
264: 
265:         $sql .= " LIMIT $count";
266:         if ($offset > 0) {
267:             $sql .= " OFFSET $offset";
268:         }
269: 
270:         return $sql;
271:     }
272: 
273:     /**
274:      * Return the most recent value from the specified sequence in the database.
275:      * This is supported only on RDBMS brands that support sequences
276:      * (e.g. Oracle, PostgreSQL, DB2).  Other RDBMS brands return null.
277:      *
278:      * @param string $sequenceName
279:      * @return string
280:      */
281:     public function lastSequenceId($sequenceName)
282:     {
283:         $this->_connect();
284:         $sequenceName = str_replace($this->getQuoteIdentifierSymbol(), '', (string) $sequenceName);
285:         $value = $this->fetchOne("SELECT CURRVAL("
286:                . $this->quote($this->quoteIdentifier($sequenceName, true))
287:                . ")");
288:         return $value;
289:     }
290: 
291:     /**
292:      * Generate a new value from the specified sequence in the database, and return it.
293:      * This is supported only on RDBMS brands that support sequences
294:      * (e.g. Oracle, PostgreSQL, DB2).  Other RDBMS brands return null.
295:      *
296:      * @param string $sequenceName
297:      * @return string
298:      */
299:     public function nextSequenceId($sequenceName)
300:     {
301:         $this->_connect();
302:         $sequenceName = str_replace($this->getQuoteIdentifierSymbol(), '', (string) $sequenceName);
303:         $value = $this->fetchOne("SELECT NEXTVAL("
304:                . $this->quote($this->quoteIdentifier($sequenceName, true))
305:                . ")");
306:         return $value;
307:     }
308: 
309:     /**
310:      * Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT column.
311:      *
312:      * As a convention, on RDBMS brands that support sequences
313:      * (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
314:      * from the arguments and returns the last id generated by that sequence.
315:      * On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
316:      * returns the last value generated for such a column, and the table name
317:      * argument is disregarded.
318:      *
319:      * @param string $tableName   OPTIONAL Name of table.
320:      * @param string $primaryKey  OPTIONAL Name of primary key column.
321:      * @return string
322:      */
323:     public function lastInsertId($tableName = null, $primaryKey = null)
324:     {
325:         if ($tableName !== null) {
326:             $sequenceName = $tableName;
327:             if ($primaryKey) {
328:                 $sequenceName .= "_$primaryKey";
329:             }
330:             $sequenceName .= '_seq';
331:             return $this->lastSequenceId($sequenceName);
332:         }
333:         return $this->_connection->lastInsertId($tableName);
334:     }
335: 
336: }
337: 
Pry Framework API documentation generated by ApiGen 2.6.1