dbo_mysql.php

来自「Cake Framwork , Excellent」· PHP 代码 · 共 577 行 · 第 1/2 页

		$table = $this->fullTableName($model);
		$joins = implode(' ', $this->_getJoins($model));

		if (empty($conditions)) {
			$alias = $joins = false;
		}
		$conditions = $this->conditions($this->defaultConditions($model, $conditions, $alias), true, true, $model);

		if ($conditions === false) {
			return false;
		}

		if ($this->execute($this->renderStatement('delete', compact('alias', 'table', 'joins', 'conditions'))) === false) {
			$model->onError();
			return false;
		}
		return true;
	}
/**
 * Returns a formatted error message from previous database operation.
 *
 * @return string Error message with error number
 */
	function lastError() {
		if (mysql_errno($this->connection)) {
			return mysql_errno($this->connection).': '.mysql_error($this->connection);
		}
		return null;
	}
/**
 * Returns number of affected rows in previous database operation. If no previous operation exists,
 * this returns false.
 *
 * @return integer Number of affected rows
 */
	function lastAffected() {
		if ($this->_result) {
			return mysql_affected_rows($this->connection);
		}
		return null;
	}
/**
 * Returns number of rows in previous resultset. If no previous resultset exists,
 * this returns false.
 *
 * @return integer Number of rows in resultset
 */
	function lastNumRows() {
		if ($this->_result and is_resource($this->_result)) {
			return @mysql_num_rows($this->_result);
		}
		return null;
	}
/**
 * Returns the ID generated from the previous INSERT operation.
 *
 * @param unknown_type $source
 * @return in
 */
	function lastInsertId($source = null) {
		$id = $this->fetchRow('SELECT LAST_INSERT_ID() AS insertID', false);
		if ($id !== false && !empty($id) && !empty($id[0]) && isset($id[0]['insertID'])) {
			return $id[0]['insertID'];
		}

		return null;
	}
/**
 * Converts database-layer column types to basic types
 *
 * @param string $real Real database-layer column type (i.e. "varchar(255)")
 * @return string Abstract column type (i.e. "string")
 */
	function column($real) {
		if (is_array($real)) {
			$col = $real['name'];
			if (isset($real['limit'])) {
				$col .= '('.$real['limit'].')';
			}
			return $col;
		}

		$col = str_replace(')', '', $real);
		$limit = $this->length($real);
		if (strpos($col, '(') !== false) {
			list($col, $vals) = explode('(', $col);
		}

		if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
			return $col;
		}
		if ($col == 'tinyint' && $limit == 1) {
			return 'boolean';
		}
		if (strpos($col, 'int') !== false) {
			return 'integer';
		}
		if (strpos($col, 'char') !== false || $col == 'tinytext') {
			return 'string';
		}
		if (strpos($col, 'text') !== false) {
			return 'text';
		}
		if (strpos($col, 'blob') !== false || $col == 'binary') {
			return 'binary';
		}
		if (in_array($col, array('float', 'double', 'decimal'))) {
			return 'float';
		}
		if (strpos($col, 'enum') !== false) {
			return "enum($vals)";
		}
		if ($col == 'boolean') {
			return $col;
		}
		return 'text';
	}
/**
 * Enter description here...
 *
 * @param unknown_type $results
 */
	function resultSet(&$results) {
		$this->results =& $results;
		$this->map = array();
		$num_fields = mysql_num_fields($results);
		$index = 0;
		$j = 0;

		while ($j < $num_fields) {

			$column = mysql_fetch_field($results,$j);
			if (!empty($column->table)) {
				$this->map[$index++] = array($column->table, $column->name);
			} else {
				$this->map[$index++] = array(0, $column->name);
			}
			$j++;
		}
	}
/**
 * Fetches the next row from the current result set
 *
 * @return unknown
 */
	function fetchResult() {
		if ($row = mysql_fetch_row($this->results)) {
			$resultRow = array();
			$i = 0;
			foreach ($row as $index => $field) {
				list($table, $column) = $this->map[$index];
				$resultRow[$table][$column] = $row[$index];
				$i++;
			}
			return $resultRow;
		} else {
			return false;
		}
	}
/**
 * Sets the database encoding
 *
 * @param string $enc Database encoding
 */
	function setEncoding($enc) {
		return $this->_execute('SET NAMES ' . $enc) != false;
	}
/**
 * Gets the database encoding
 *
 * @return string The database encoding
 */
	function getEncoding() {
		return mysql_client_encoding($this->connection);
	}
/**
 * Inserts multiple values into a table
 *
 * @param string $table
 * @param string $fields
 * @param array $values
 */
	function insertMulti($table, $fields, $values) {
		$table = $this->fullTableName($table);
		if (is_array($fields)) {
			$fields = join(', ', array_map(array(&$this, 'name'), $fields));
		}
		$values = implode(', ', $values);
		$this->query("INSERT INTO {$table} ({$fields}) VALUES {$values}");
	}
/**
 * Returns an array of the indexes in given table name.
 *
 * @param string $model Name of model to inspect
 * @return array Fields in table. Keys are column and unique
 */
	function index($model) {
		$index = array();
		$table = $this->fullTableName($model, false);
		if($table) {
			$indexes = $this->query('SHOW INDEX FROM ' . $table);
			$keys = Set::extract($indexes, '{n}.STATISTICS');
			foreach ($keys as $i => $key) {
				if(!isset($index[$key['Key_name']])) {
					$index[$key['Key_name']]['column'] = $key['Column_name'];
					$index[$key['Key_name']]['unique'] = ife($key['Non_unique'] == 0, 1, 0);
				} else {
					if(!is_array($index[$key['Key_name']]['column'])) {
						$col[] = $index[$key['Key_name']]['column'];
					}
					$col[] = $key['Column_name'];
					$index[$key['Key_name']]['column'] = $col;
				}
			}
		}
		return $index;
	}
/**
 * Generate a MySQL Alter Table syntax for the given Schema comparison
 *
 * @param unknown_type $schema
 * @return unknown
 */
	function alterSchema($compare, $table = null) {
		if(!is_array($compare)) {
			return false;
		}
		$out = '';
		$colList = array();
		foreach($compare as $curTable => $types) {
			if (!$table || $table == $curTable) {
				$out .= 'ALTER TABLE ' . $this->fullTableName($curTable) . " \n";
				foreach($types as $type => $column) {
					switch($type) {
						case 'add':
							foreach($column as $field => $col) {
								$col['name'] = $field;
								$alter = 'ADD '.$this->buildColumn($col);
								if(isset($col['after'])) {
									$alter .= ' AFTER '. $this->name($col['after']);
								}
								$colList[] = $alter;
							}
						break;
						case 'drop':
							foreach($column as $field => $col) {
								$col['name'] = $field;
								$colList[] = 'DROP '.$this->name($field);
							}
						break;
						case 'change':
							foreach($column as $field => $col) {
								if(!isset($col['name'])) {
									$col['name'] = $field;
								}
								$colList[] = 'CHANGE '. $this->name($field).' '.$this->buildColumn($col);
							}
						break;
					}
				}
				$out .= "\t" . join(",\n\t", $colList) . ";\n\n";
			}
		}
		return $out;
	}
/**
 * Generate a MySQL "drop table" statement for the given Schema object
 *
 * @param object $schema An instance of a subclass of CakeSchema
 * @param string $table Optional.  If specified only the table name given will be generated.
 *                      Otherwise, all tables defined in the schema are generated.
 * @return string
 */
	function dropSchema($schema, $table = null) {
		if (!is_a($schema, 'CakeSchema')) {
			trigger_error(__('Invalid schema object', true), E_USER_WARNING);
			return null;
		}
		$out = '';
		foreach ($schema->tables as $curTable => $columns) {
			if (!$table || $table == $curTable) {
				$out .= 'DROP TABLE IF EXISTS ' . $this->fullTableName($curTable) . ";\n";
			}
		}
		return $out;
	}
}
?>