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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: Mysql.php 20096 2010-01-06 02:05:09Z bkarwin $
 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 MySQL 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_Mysql extends Zend_Db_Adapter_Pdo_Abstract
 40: {
 41: 
 42:     /**
 43:      * PDO type.
 44:      *
 45:      * @var string
 46:      */
 47:     protected $_pdoType = 'mysql';
 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 $_numericDataTypes = array(
 61:         Zend_Db::INT_TYPE    => Zend_Db::INT_TYPE,
 62:         Zend_Db::BIGINT_TYPE => Zend_Db::BIGINT_TYPE,
 63:         Zend_Db::FLOAT_TYPE  => Zend_Db::FLOAT_TYPE,
 64:         'INT'                => Zend_Db::INT_TYPE,
 65:         'INTEGER'            => Zend_Db::INT_TYPE,
 66:         'MEDIUMINT'          => Zend_Db::INT_TYPE,
 67:         'SMALLINT'           => Zend_Db::INT_TYPE,
 68:         'TINYINT'            => Zend_Db::INT_TYPE,
 69:         'BIGINT'             => Zend_Db::BIGINT_TYPE,
 70:         'SERIAL'             => Zend_Db::BIGINT_TYPE,
 71:         'DEC'                => Zend_Db::FLOAT_TYPE,
 72:         'DECIMAL'            => Zend_Db::FLOAT_TYPE,
 73:         'DOUBLE'             => Zend_Db::FLOAT_TYPE,
 74:         'DOUBLE PRECISION'   => Zend_Db::FLOAT_TYPE,
 75:         'FIXED'              => Zend_Db::FLOAT_TYPE,
 76:         'FLOAT'              => Zend_Db::FLOAT_TYPE
 77:     );
 78: 
 79:     /**
 80:      * Creates a PDO object and connects to the database.
 81:      *
 82:      * @return void
 83:      * @throws Zend_Db_Adapter_Exception
 84:      */
 85:     protected function _connect()
 86:     {
 87:         if ($this->_connection) {
 88:             return;
 89:         }
 90: 
 91:         if (!empty($this->_config['charset'])) {
 92:             $initCommand = "SET NAMES '" . $this->_config['charset'] . "'";
 93:             $this->_config['driver_options'][1002] = $initCommand; // 1002 = PDO::MYSQL_ATTR_INIT_COMMAND
 94:         }
 95: 
 96:         parent::_connect();
 97:     }
 98: 
 99:     /**
100:      * @return string
101:      */
102:     public function getQuoteIdentifierSymbol()
103:     {
104:         return "`";
105:     }
106: 
107:     /**
108:      * Returns a list of the tables in the database.
109:      *
110:      * @return array
111:      */
112:     public function listTables()
113:     {
114:         return $this->fetchCol('SHOW TABLES');
115:     }
116: 
117:     /**
118:      * Returns the column descriptions for a table.
119:      *
120:      * The return value is an associative array keyed by the column name,
121:      * as returned by the RDBMS.
122:      *
123:      * The value of each array element is an associative array
124:      * with the following keys:
125:      *
126:      * SCHEMA_NAME      => string; name of database or schema
127:      * TABLE_NAME       => string;
128:      * COLUMN_NAME      => string; column name
129:      * COLUMN_POSITION  => number; ordinal position of column in table
130:      * DATA_TYPE        => string; SQL datatype name of column
131:      * DEFAULT          => string; default expression of column, null if none
132:      * NULLABLE         => boolean; true if column can have nulls
133:      * LENGTH           => number; length of CHAR/VARCHAR
134:      * SCALE            => number; scale of NUMERIC/DECIMAL
135:      * PRECISION        => number; precision of NUMERIC/DECIMAL
136:      * UNSIGNED         => boolean; unsigned property of an integer type
137:      * PRIMARY          => boolean; true if column is part of the primary key
138:      * PRIMARY_POSITION => integer; position of column in primary key
139:      * IDENTITY         => integer; true if column is auto-generated with unique values
140:      *
141:      * @param string $tableName
142:      * @param string $schemaName OPTIONAL
143:      * @return array
144:      */
145:     public function describeTable($tableName, $schemaName = null)
146:     {
147:         // @todo  use INFORMATION_SCHEMA someday when MySQL's
148:         // implementation has reasonably good performance and
149:         // the version with this improvement is in wide use.
150: 
151:         if ($schemaName) {
152:             $sql = 'DESCRIBE ' . $this->quoteIdentifier("$schemaName.$tableName", true);
153:         } else {
154:             $sql = 'DESCRIBE ' . $this->quoteIdentifier($tableName, true);
155:         }
156:         $stmt = $this->query($sql);
157: 
158:         // Use FETCH_NUM so we are not dependent on the CASE attribute of the PDO connection
159:         $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
160: 
161:         $field   = 0;
162:         $type    = 1;
163:         $null    = 2;
164:         $key     = 3;
165:         $default = 4;
166:         $extra   = 5;
167: 
168:         $desc = array();
169:         $i = 1;
170:         $p = 1;
171:         foreach ($result as $row) {
172:             list($length, $scale, $precision, $unsigned, $primary, $primaryPosition, $identity)
173:                 = array(null, null, null, null, false, null, false);
174:             if (preg_match('/unsigned/', $row[$type])) {
175:                 $unsigned = true;
176:             }
177:             if (preg_match('/^((?:var)?char)\((\d+)\)/', $row[$type], $matches)) {
178:                 $row[$type] = $matches[1];
179:                 $length = $matches[2];
180:             } else if (preg_match('/^decimal\((\d+),(\d+)\)/', $row[$type], $matches)) {
181:                 $row[$type] = 'decimal';
182:                 $precision = $matches[1];
183:                 $scale = $matches[2];
184:             } else if (preg_match('/^float\((\d+),(\d+)\)/', $row[$type], $matches)) {
185:                 $row[$type] = 'float';
186:                 $precision = $matches[1];
187:                 $scale = $matches[2];
188:             } else if (preg_match('/^((?:big|medium|small|tiny)?int)\((\d+)\)/', $row[$type], $matches)) {
189:                 $row[$type] = $matches[1];
190:                 // The optional argument of a MySQL int type is not precision
191:                 // or length; it is only a hint for display width.
192:             }
193:             if (strtoupper($row[$key]) == 'PRI') {
194:                 $primary = true;
195:                 $primaryPosition = $p;
196:                 if ($row[$extra] == 'auto_increment') {
197:                     $identity = true;
198:                 } else {
199:                     $identity = false;
200:                 }
201:                 ++$p;
202:             }
203:             $desc[$this->foldCase($row[$field])] = array(
204:                 'SCHEMA_NAME'      => null, // @todo
205:                 'TABLE_NAME'       => $this->foldCase($tableName),
206:                 'COLUMN_NAME'      => $this->foldCase($row[$field]),
207:                 'COLUMN_POSITION'  => $i,
208:                 'DATA_TYPE'        => $row[$type],
209:                 'DEFAULT'          => $row[$default],
210:                 'NULLABLE'         => (bool) ($row[$null] == 'YES'),
211:                 'LENGTH'           => $length,
212:                 'SCALE'            => $scale,
213:                 'PRECISION'        => $precision,
214:                 'UNSIGNED'         => $unsigned,
215:                 'PRIMARY'          => $primary,
216:                 'PRIMARY_POSITION' => $primaryPosition,
217:                 'IDENTITY'         => $identity
218:             );
219:             ++$i;
220:         }
221:         return $desc;
222:     }
223: 
224:     /**
225:      * Adds an adapter-specific LIMIT clause to the SELECT statement.
226:      *
227:      * @param  string $sql
228:      * @param  integer $count
229:      * @param  integer $offset OPTIONAL
230:      * @throws Zend_Db_Adapter_Exception
231:      * @return string
232:      */
233:      public function limit($sql, $count, $offset = 0)
234:      {
235:         $count = intval($count);
236:         if ($count <= 0) {
237:             /** @see Zend_Db_Adapter_Exception */
238:             require_once 'Zend/Db/Adapter/Exception.php';
239:             throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
240:         }
241: 
242:         $offset = intval($offset);
243:         if ($offset < 0) {
244:             /** @see Zend_Db_Adapter_Exception */
245:             require_once 'Zend/Db/Adapter/Exception.php';
246:             throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
247:         }
248: 
249:         $sql .= " LIMIT $count";
250:         if ($offset > 0) {
251:             $sql .= " OFFSET $offset";
252:         }
253: 
254:         return $sql;
255:     }
256: 
257: }
258: 
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