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authorEric Roberts <eric@cryode.com>2012-12-12 14:02:11 +0100
committerEric Roberts <eric@cryode.com>2012-12-12 14:02:11 +0100
commitb9e35f21e1c70b6aa67c47e9244ed83195abc00a (patch)
tree64f82db362deeac48cc20d1d1afd80651f36f5a5 /system/database/drivers/mssql/mssql_driver.php
parent0b05705c52c3bca7f9b3aee657c888e8ad1ff422 (diff)
parent545a7c86701875e1412bcde316e9bcc76d9a23a0 (diff)
Merge branch 'refs/heads/develop' into feature/form_error_msgs
Conflicts: system/language/english/form_validation_lang.php user_guide_src/source/libraries/form_validation.rst Signed-off-by: Eric Roberts <eric@cryode.com>
Diffstat (limited to 'system/database/drivers/mssql/mssql_driver.php')
-rw-r--r--system/database/drivers/mssql/mssql_driver.php388
1 files changed, 208 insertions, 180 deletions
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index 90609a84d..d3e439d69 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -1,4 +1,4 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php
/**
* CodeIgniter
*
@@ -24,12 +24,13 @@
* @since Version 1.0
* @filesource
*/
+defined('BASEPATH') OR exit('No direct script access allowed');
/**
* MS SQL Database Adapter Class
*
* Note: _DB is an extender class that the app controller
- * creates dynamically based on whether the active record
+ * creates dynamically based on whether the query builder
* class is being used or not.
*
* @package CodeIgniter
@@ -40,36 +41,78 @@
*/
class CI_DB_mssql_driver extends CI_DB {
+ /**
+ * Database driver
+ *
+ * @var string
+ */
public $dbdriver = 'mssql';
- // The character used for escaping
- protected $_escape_char = '';
+ // --------------------------------------------------------------------
- // clause and character used for LIKE escape sequences
- protected $_like_escape_str = " ESCAPE '%s' ";
- protected $_like_escape_chr = '!';
+ /**
+ * ORDER BY random keyword
+ *
+ * @var array
+ */
+ protected $_random_keyword = array('NEWID()', 'RAND(%d)');
/**
- * The syntax to count rows is slightly different across different
- * database engines, so this string appears in each driver and is
- * used for the count_all() and count_all_results() methods.
+ * Quoted identifier flag
+ *
+ * Whether to use SQL-92 standard quoted identifier
+ * (double quotes) or brackets for identifier escaping.
+ *
+ * @var bool
*/
- protected $_count_string = 'SELECT COUNT(*) AS ';
- protected $_random_keyword = ' NEWID()';
+ protected $_quoted_identifier = TRUE;
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Class constructor
+ *
+ * Appends the port number to the hostname, if needed.
+ *
+ * @param array $params
+ * @return void
+ */
+ public function __construct($params)
+ {
+ parent::__construct($params);
+
+ if ( ! empty($this->port))
+ {
+ $this->hostname .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port;
+ }
+ }
+
+ // --------------------------------------------------------------------
/**
* Non-persistent database connection
*
+ * @param bool $persistent
* @return resource
*/
- public function db_connect()
+ public function db_connect($persistent = FALSE)
{
- if ($this->port != '')
+ $this->conn_id = ($persistent)
+ ? @mssql_pconnect($this->hostname, $this->username, $this->password)
+ : @mssql_connect($this->hostname, $this->username, $this->password);
+
+ if ( ! $this->conn_id)
{
- $this->hostname .= ','.$this->port;
+ return FALSE;
}
- return @mssql_connect($this->hostname, $this->username, $this->password);
+ // Determine how identifiers are escaped
+ $query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi');
+ $query = $query->row_array();
+ $this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi'];
+ $this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']');
+
+ return $this->conn_id;
}
// --------------------------------------------------------------------
@@ -81,12 +124,7 @@ class CI_DB_mssql_driver extends CI_DB {
*/
public function db_pconnect()
{
- if ($this->port != '')
- {
- $this->hostname .= ','.$this->port;
- }
-
- return @mssql_pconnect($this->hostname, $this->username, $this->password);
+ return $this->db_connect(TRUE);
}
// --------------------------------------------------------------------
@@ -94,7 +132,7 @@ class CI_DB_mssql_driver extends CI_DB {
/**
* Select the database
*
- * @param string database name
+ * @param string $database
* @return bool
*/
public function db_select($database = '')
@@ -106,7 +144,7 @@ class CI_DB_mssql_driver extends CI_DB {
// Note: The brackets are required in the event that the DB name
// contains reserved characters
- if (@mssql_select_db('['.$database.']', $this->conn_id))
+ if (@mssql_select_db($this->escape_identifiers($database), $this->conn_id))
{
$this->database = $database;
return TRUE;
@@ -120,8 +158,8 @@ class CI_DB_mssql_driver extends CI_DB {
/**
* Execute the query
*
- * @param string an SQL query
- * @return resource
+ * @param string $sql an SQL query
+ * @return mixed resource if rows are returned, bool otherwise
*/
protected function _execute($sql)
{
@@ -133,17 +171,13 @@ class CI_DB_mssql_driver extends CI_DB {
/**
* Begin Transaction
*
+ * @param bool $test_mode
* @return bool
*/
public function trans_begin($test_mode = FALSE)
{
- if ( ! $this->trans_enabled)
- {
- return TRUE;
- }
-
// When transactions are nested we only begin/commit/rollback the outermost ones
- if ($this->_trans_depth > 0)
+ if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
{
return TRUE;
}
@@ -151,10 +185,9 @@ class CI_DB_mssql_driver extends CI_DB {
// Reset the transaction failure flag.
// If the $test_mode flag is set to TRUE transactions will be rolled back
// even if the queries produce a successful result.
- $this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
+ $this->_trans_failure = ($test_mode === TRUE);
- $this->simple_query('BEGIN TRAN');
- return TRUE;
+ return $this->simple_query('BEGIN TRAN');
}
// --------------------------------------------------------------------
@@ -166,19 +199,13 @@ class CI_DB_mssql_driver extends CI_DB {
*/
public function trans_commit()
{
- if ( ! $this->trans_enabled)
- {
- return TRUE;
- }
-
// When transactions are nested we only begin/commit/rollback the outermost ones
- if ($this->_trans_depth > 0)
+ if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
{
return TRUE;
}
- $this->simple_query('COMMIT TRAN');
- return TRUE;
+ return $this->simple_query('COMMIT TRAN');
}
// --------------------------------------------------------------------
@@ -190,19 +217,13 @@ class CI_DB_mssql_driver extends CI_DB {
*/
public function trans_rollback()
{
- if ( ! $this->trans_enabled)
- {
- return TRUE;
- }
-
// When transactions are nested we only begin/commit/rollback the outermost ones
- if ($this->_trans_depth > 0)
+ if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
{
return TRUE;
}
- $this->simple_query('ROLLBACK TRAN');
- return TRUE;
+ return $this->simple_query('ROLLBACK TRAN');
}
// --------------------------------------------------------------------
@@ -210,8 +231,8 @@ class CI_DB_mssql_driver extends CI_DB {
/**
* Escape String
*
- * @param string
- * @param bool whether or not the string will be used in a LIKE condition
+ * @param string $str
+ * @param bool $like Whether or not the string will be used in a LIKE condition
* @return string
*/
public function escape_str($str, $like = FALSE)
@@ -232,7 +253,7 @@ class CI_DB_mssql_driver extends CI_DB {
// escape LIKE condition wildcards
if ($like === TRUE)
{
- $str = str_replace(
+ return str_replace(
array($this->_like_escape_chr, '%', '_'),
array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'),
$str
@@ -265,28 +286,26 @@ class CI_DB_mssql_driver extends CI_DB {
*/
public function insert_id()
{
- $ver = self::_parse_major_version($this->version());
- $sql = ($ver >= 8 ? "SELECT SCOPE_IDENTITY() AS last_id" : "SELECT @@IDENTITY AS last_id");
- $query = $this->query($sql);
- $row = $query->row();
- return $row->last_id;
+ $query = version_compare($this->version(), '8', '>=')
+ ? 'SELECT SCOPE_IDENTITY() AS last_id'
+ : 'SELECT @@IDENTITY AS last_id';
+
+ $query = $this->query($query);
+ $query = $query->row();
+ return $query->last_id;
}
// --------------------------------------------------------------------
/**
- * Parse major version
- *
- * Grabs the major version number from the
- * database server version string passed in.
+ * Set client character set
*
- * @param string $version
- * @return int major version number
+ * @param string $charset
+ * @return bool
*/
- protected function _parse_major_version($version)
+ protected function _db_set_charset($charset)
{
- preg_match('/([0-9]+)\.([0-9]+)\.([0-9]+)/', $version, $ver_info);
- return $ver_info[1]; // return the major version b/c that's all we're interested in.
+ return (@ini_set('mssql.charset', $charset) !== FALSE);
}
// --------------------------------------------------------------------
@@ -304,54 +323,26 @@ class CI_DB_mssql_driver extends CI_DB {
// --------------------------------------------------------------------
/**
- * "Count All" query
- *
- * Generates a platform-specific query string that counts all records in
- * the specified database
- *
- * @param string
- * @return string
- */
- public function count_all($table = '')
- {
- if ($table == '')
- {
- return 0;
- }
-
- $query = $this->query($this->_count_string.$this->protect_identifiers('numrows').' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE));
- if ($query->num_rows() == 0)
- {
- return 0;
- }
-
- $row = $query->row();
- $this->_reset_select();
- return (int) $row->numrows;
- }
-
- // --------------------------------------------------------------------
-
- /**
* List table query
*
* Generates a platform-specific query string so that the table names can be fetched
*
- * @param bool
+ * @param bool $prefix_limit
* @return string
*/
protected function _list_tables($prefix_limit = FALSE)
{
- $sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
+ $sql = 'SELECT '.$this->escape_identifiers('name')
+ .' FROM '.$this->escape_identifiers('sysobjects')
+ .' WHERE '.$this->escape_identifiers('type')." = 'U'";
- // for future compatibility
- if ($prefix_limit !== FALSE AND $this->dbprefix != '')
+ if ($prefix_limit !== FALSE AND $this->dbprefix !== '')
{
- //$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
- return FALSE; // not currently supported
+ $sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
+ .sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
- return $sql;
+ return $sql.' ORDER BY '.$this->escape_identifiers('name');
}
// --------------------------------------------------------------------
@@ -361,27 +352,52 @@ class CI_DB_mssql_driver extends CI_DB {
*
* Generates a platform-specific query string so that the column names can be fetched
*
- * @param string the table name
+ * @param string $table
* @return string
*/
protected function _list_columns($table = '')
{
- return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'";
+ return 'SELECT COLUMN_NAME
+ FROM INFORMATION_SCHEMA.Columns
+ WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
}
// --------------------------------------------------------------------
/**
- * Field data query
- *
- * Generates a platform-specific query so that the column data can be retrieved
+ * Returns an object with field data
*
- * @param string the table name
- * @return string
+ * @param string $table
+ * @return array
*/
- protected function _field_data($table)
+ public function field_data($table = '')
{
- return "SELECT TOP 1 * FROM ".$table;
+ if ($table === '')
+ {
+ return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
+ }
+
+ $sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT
+ FROM INFORMATION_SCHEMA.Columns
+ WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
+
+ if (($query = $this->query($sql)) === FALSE)
+ {
+ return FALSE;
+ }
+ $query = $query->result_object();
+
+ $retval = array();
+ for ($i = 0, $c = count($query); $i < $c; $i++)
+ {
+ $retval[$i] = new stdClass();
+ $retval[$i]->name = $query[$i]->COLUMN_NAME;
+ $retval[$i]->type = $query[$i]->DATA_TYPE;
+ $retval[$i]->max_length = ($query[$i]->CHARACTER_MAXIMUM_LENGTH > 0) ? $query[$i]->CHARACTER_MAXIMUM_LENGTH : $query[$i]->NUMERIC_PRECISION;
+ $retval[$i]->default = $query[$i]->COLUMN_DEFAULT;
+ }
+
+ return $retval;
}
// --------------------------------------------------------------------
@@ -404,54 +420,19 @@ class CI_DB_mssql_driver extends CI_DB {
// --------------------------------------------------------------------
/**
- * From Tables
- *
- * This function implicitly groups FROM tables so there is no confusion
- * about operator precedence in harmony with SQL standards
- *
- * @param array
- * @return string
- */
- protected function _from_tables($tables)
- {
- if ( ! is_array($tables))
- {
- $tables = array($tables);
- }
-
- return implode(', ', $tables);
- }
-
- // --------------------------------------------------------------------
-
- /**
* Update statement
*
* Generates a platform-specific update string from the supplied data
*
- * @param string the table name
- * @param array the update data
- * @param array the where clause
- * @param array the orderby clause (ignored)
- * @param array the limit clause (ignored)
- * @param array the like clause
+ * @param string $table
+ * @param array $values
* @return string
*/
- protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array())
+ protected function _update($table, $values)
{
- foreach($values as $key => $val)
- {
- $valstr[] = $key.' = '.$val;
- }
-
- $where = empty($where) ? '' : ' WHERE '.implode(' ', $where);
-
- if ( ! empty($like))
- {
- $where .= ($where === '' ? ' WHERE ' : ' AND ').implode(' ', $like);
- }
-
- return 'UPDATE '.$table.' SET '.implode(', ', $valstr).' WHERE '.$where;
+ $this->qb_limit = FALSE;
+ $this->qb_orderby = array();
+ return parent::_update($table, $values);
}
// --------------------------------------------------------------------
@@ -461,10 +442,10 @@ class CI_DB_mssql_driver extends CI_DB {
*
* Generates a platform-specific truncate string from the supplied data
*
- * If the database does not support the truncate() command,
+ * If the database does not support the TRUNCATE statement,
* then this method maps to 'DELETE FROM table'
*
- * @param string the table name
+ * @param string $table
* @return string
*/
protected function _truncate($table)
@@ -479,43 +460,91 @@ class CI_DB_mssql_driver extends CI_DB {
*
* Generates a platform-specific delete string from the supplied data
*
- * @param string the table name
- * @param array the where clause
- * @param array the like clause
- * @param string the limit clause
+ * @param string $table
* @return string
*/
- protected function _delete($table, $where = array(), $like = array(), $limit = FALSE)
+ protected function _delete($table)
{
- $conditions = array();
-
- empty($where) OR $conditions[] = implode(' ', $where);
- empty($like) OR $conditions[] = implode(' ', $like);
-
- $conditions = (count($conditions) > 0) ? ' WHERE '.implode(' AND ', $conditions) : '';
+ if ($this->qb_limit)
+ {
+ return 'WITH ci_delete AS (SELECT TOP '.$this->qb_limit.' * FROM '.$table.$this->_compile_wh('qb_where').') DELETE FROM ci_delete';
+ }
- return ($limit)
- ? 'WITH ci_delete AS (SELECT TOP '.$limit.' * FROM '.$table.$conditions.') DELETE FROM ci_delete'
- : 'DELETE FROM '.$table.$conditions;
+ return parent::_delete($table);
}
// --------------------------------------------------------------------
/**
- * Limit string
+ * LIMIT
*
* Generates a platform-specific LIMIT clause
*
- * @param string the sql query string
- * @param int the number of rows to limit the query to
- * @param int the offset value
+ * @param string $sql SQL Query
* @return string
*/
- protected function _limit($sql, $limit, $offset)
+ protected function _limit($sql)
+ {
+ $limit = $this->qb_offset + $this->qb_limit;
+
+ // As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported,
+ // however an ORDER BY clause is required for it to work
+ if (version_compare($this->version(), '9', '>=') && $this->qb_offset && ! empty($this->qb_orderby))
+ {
+ $orderby = $this->_compile_order_by();
+
+ // We have to strip the ORDER BY clause
+ $sql = trim(substr($sql, 0, strrpos($sql, $orderby)));
+
+ // Get the fields to select from our subquery, so that we can avoid CI_rownum appearing in the actual results
+ if (count($this->qb_select) === 0)
+ {
+ $select = '*'; // Inevitable
+ }
+ else
+ {
+ // Use only field names and their aliases, everything else is out of our scope.
+ $select = array();
+ $field_regexp = ($this->_quoted_identifier)
+ ? '("[^\"]+")' : '(\[[^\]]+\])';
+ for ($i = 0, $c = count($this->qb_select); $i < $c; $i++)
+ {
+ $select[] = preg_match('/(?:\s|\.)'.$field_regexp.'$/i', $this->qb_select[$i], $m)
+ ? $m[1] : $this->qb_select[$i];
+ }
+ $select = implode(', ', $select);
+ }
+
+ return 'SELECT '.$select." FROM (\n\n"
+ .preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.trim($orderby).') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
+ ."\n\n) ".$this->escape_identifiers('CI_subquery')
+ ."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.($this->qb_offset + 1).' AND '.$limit;
+ }
+
+ return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Insert batch statement
+ *
+ * Generates a platform-specific insert string from the supplied data.
+ *
+ * @param string $table Table name
+ * @param array $keys INSERT keys
+ * @param array $values INSERT values
+ * @return string|bool
+ */
+ protected function _insert_batch($table, $keys, $values)
{
- $i = $limit + $offset;
+ // Multiple-value inserts are only supported as of SQL Server 2008
+ if (version_compare($this->version(), '10', '>='))
+ {
+ return parent::_insert_batch($table, $keys, $values);
+ }
- return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$i.' ', $sql);
+ return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE;
}
// --------------------------------------------------------------------
@@ -523,12 +552,11 @@ class CI_DB_mssql_driver extends CI_DB {
/**
* Close DB Connection
*
- * @param resource
* @return void
*/
- protected function _close($conn_id)
+ protected function _close()
{
- @mssql_close($conn_id);
+ @mssql_close($this->conn_id);
}
}