dbo_mssql.php

Cake Framwork , Excellent

 * @return boolean True on success, false on fail
 * (i.e. if the database/model does not support transactions).
 */
	function begin(&$model) {
		if (parent::begin($model) && $this->execute('BEGIN TRANSACTION')) {
			$this->_transactionStarted = true;
			return true;
		}
		return false;
	}
/**
 * Generates and executes an SQL INSERT statement for given model, fields, and values.
 * Removes Identity (primary key) column from update data before returning to parent, if
 * value is empty.
 *
 * @param Model $model
 * @param array $fields
 * @param array $values
 * @param mixed $conditions
 * @return array
 */
	function create(&$model, $fields = null, $values = null) {
		if (!empty($values)) {
			$fields = array_combine($fields, $values);
		}

		if (array_key_exists($model->primaryKey, $fields)) {
			if (empty($fields[$model->primaryKey])) {
				unset($fields[$model->primaryKey]);
			} else {
				$this->_execute("SET IDENTITY_INSERT " . $this->fullTableName($model) . " ON");
			}
		}
		$result = parent::create($model, array_keys($fields), array_values($fields));
		if (array_key_exists($model->primaryKey, $fields) && !empty($fields[$model->primaryKey])) {
			$this->_execute("SET IDENTITY_INSERT " . $this->fullTableName($model) . " OFF");
		}
		return $result;
	}

/**
 * Generates and executes an SQL UPDATE statement for given model, fields, and values.
 * Removes Identity (primary key) column from update data before returning to parent.
 *
 * @param Model $model
 * @param array $fields
 * @param array $values
 * @param mixed $conditions
 * @return array
 */
	function update(&$model, $fields = array(), $values = null, $conditions = null) {
		if (!empty($values)) {
			$fields = array_combine($fields, $values);
		}
		if (isset($fields[$model->primaryKey])) {
			unset($fields[$model->primaryKey]);
		}
		return parent::update($model, array_keys($fields), array_values($fields), $conditions);
	}
/**
 * Returns a formatted error message from previous database operation.
 *
 * @return string Error message with error number
 */
	function lastError() {
		$error = mssql_get_last_message($this->connection);

		if ($error) {
			if (strpos(strtolower($error), 'changed database') === false) {
				return $error;
			}
		}
		return null;
	}
/**
 * Returns number of affected rows in previous database operation. If no previous operation exists,
 * this returns false.
 *
 * @return integer Number of affected rows
 */
	function lastAffected() {
		if ($this->_result) {
			return mssql_rows_affected($this->connection);
		}
		return null;
	}
/**
 * Returns number of rows in previous resultset. If no previous resultset exists,
 * this returns false.
 *
 * @return integer Number of rows in resultset
 */
	function lastNumRows() {
		if ($this->_result) {
			return @mssql_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 SCOPE_IDENTITY() AS insertID', false);
		return $id[0]['insertID'];
	}
/**
 * Returns a limit statement in the correct format for the particular database.
 *
 * @param integer $limit Limit of results returned
 * @param integer $offset Offset from which to start results
 * @return string SQL limit/offset statement
 */
	function limit($limit, $offset = null) {
		if ($limit) {
			$rt = '';
			if (!strpos(strtolower($limit), 'top') || strpos(strtolower($limit), 'top') === 0) {
				$rt = ' TOP';
			}
			$rt .= ' ' . $limit;
			if (is_int($offset) && $offset > 0) {
				$rt .= ' OFFSET ' . $offset;
			}
			return $rt;
		}
		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);
		$limit              = null;
		if (strpos($col, '(') !== false) {
			list($col, $limit) = explode('(', $col);
		}

		if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
			return $col;
		}
		if ($col == 'bit') {
			return 'boolean';
		}
		if (strpos($col, 'int') !== false) {
			return 'integer';
		}
		if (strpos($col, 'char') !== false) {
			return 'string';
		}
		if (strpos($col, 'text') !== false) {
			return 'text';
		}
		if (strpos($col, 'binary') !== false || $col == 'image') {
			return 'binary';
		}
		if (in_array($col, array('float', 'real', 'decimal', 'numeric'))) {
			return 'float';
		}
		return 'text';
	}
/**
 * Enter description here...
 *
 * @param unknown_type $results
 */
	function resultSet(&$results) {
		$this->results =& $results;
		$this->map = array();
		$num_fields = mssql_num_fields($results);
		$index = 0;
		$j = 0;

		while ($j < $num_fields) {
			$column = mssql_field_name($results, $j);

			if (strpos($column, '__')) {
				if (isset($this->__fieldMappings[$column]) && strpos($this->__fieldMappings[$column], '.')) {
					$map = explode('.', $this->__fieldMappings[$column]);
				} elseif (isset($this->__fieldMappings[$column])) {
					$map = array(0, $this->__fieldMappings[$column]);
				} else {
					$map = array(0, $column);
				}
				$this->map[$index++] = $map;
			} else {
				$this->map[$index++] = array(0, $column);
			}
			$j++;
		}
	}
/**
 * Builds final SQL statement
 *
 * @param string $type Query type
 * @param array $data Query data
 * @return string
 */
	function renderStatement($type, $data) {
		if (strtolower($type) == 'select') {
			extract($data);
			$fields = trim($fields);

			if (strpos($limit, 'TOP') !== false && strpos($fields, 'DISTINCT ') === 0) {
				$limit = 'DISTINCT ' . trim($limit);
				$fields = substr($fields, 9);
			}

			if (preg_match('/offset\s+([0-9]+)/i', $limit, $offset)) {
				$limit = preg_replace('/\s*offset.*$/i', '', $limit);
				preg_match('/top\s+([0-9]+)/i', $limit, $limitVal);
				$offset = intval($offset[1]) + intval($limitVal[1]);
				$rOrder = $this->__switchSort($order);
				list($order2, $rOrder) = array($this->__mapFields($order), $this->__mapFields($rOrder));
				return "SELECT * FROM (SELECT {$limit} * FROM (SELECT TOP {$offset} {$fields} FROM {$table} {$alias} {$joins} {$conditions} {$order}) AS Set1 {$rOrder}) AS Set2 {$order2}";
			} else {
				return "SELECT {$limit} {$fields} FROM {$table} {$alias} {$joins} {$conditions} {$order}";
			}
		} else {
			return parent::renderStatement($type, $data);
		}
	}
/**
 * Reverses the sort direction of ORDER statements to get paging offsets to work correctly
 *
 * @param string $order
 * @return string
 * @access private
 */
	function __switchSort($order) {
		$order = preg_replace('/\s+ASC/i', '__tmp_asc__', $order);
		$order = preg_replace('/\s+DESC/i', ' ASC', $order);
		return preg_replace('/__tmp_asc__/', ' DESC', $order);
	}
/**
 * Translates field names used for filtering and sorting to shortened names using the field map
 *
 * @param string $sql A snippet of SQL representing an ORDER or WHERE statement
 * @return string The value of $sql with field names replaced
 * @access private
 */
	function __mapFields($sql) {
		if (empty($sql) || empty($this->__fieldMappings)) {
			return $sql;
		}
		foreach ($this->__fieldMappings as $key => $val) {
			$sql = preg_replace('/' . preg_quote($val) . '/', $this->name($key), $sql);
			$sql = preg_replace('/' . preg_quote($this->name($val)) . '/', $this->name($key), $sql);
		}
		return $sql;
	}
/**
 * Returns an array of all result rows for a given SQL query.
 * Returns false if no rows matched.
 *
 * @param string $sql SQL statement
 * @param boolean $cache Enables returning/storing cached query results
 * @return array Array of resultset rows, or false if no rows matched
 */
	function read(&$model, $queryData = array(), $recursive = null) {
		$results = parent::read($model, $queryData, $recursive);
		$this->__fieldMappings = array();
		$this->__fieldMapBase = null;
		return $results;
	}
/**
 * Fetches the next row from the current result set
 *
 * @return unknown
 */
	function fetchResult() {
		if ($row = mssql_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;
		}
	}
/**
 * Generate a database-native column schema string
 *
 * @param array $column An array structured like the following: array('name'=>'value', 'type'=>'value'[, options]),
 *                      where options can be 'default', 'length', or 'key'.
 * @return string
 */
	function buildColumn($column) {
		$result = preg_replace('/(int|integer)\([0-9]+\)/i', '$1', parent::buildColumn($column));
		$null = (
			(isset($column['null']) && $column['null'] == true) ||
			(array_key_exists('default', $column) && $column['default'] === null) ||
			(array_keys($column) == array('type', 'name'))
		);
		$stringKey = (isset($column['key']) && $column['key'] == 'primary' && $column['type'] != 'integer');
		if ($null) {
			$result .= " NULL";
		}
		return $result;
	}
}

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