diff options
Diffstat (limited to 'system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php')
| -rw-r--r-- | system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php | 145 |
1 files changed, 74 insertions, 71 deletions
diff --git a/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php b/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php index 7060c9eb9..6ac32fc16 100644 --- a/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php +++ b/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php @@ -1,4 +1,4 @@ -<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); +<?php /** * CodeIgniter * @@ -24,6 +24,7 @@ * @since Version 3.0.0 * @filesource */ +defined('BASEPATH') OR exit('No direct script access allowed'); /** * PDO DBLIB Database Adapter Class @@ -40,18 +41,40 @@ */ class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { + /** + * Sub-driver + * + * @var string + */ public $subdriver = 'dblib'; + // -------------------------------------------------------------------- + + /** + * ORDER BY random keyword + * + * @var string + */ protected $_random_keyword = ' NEWID()'; + /** + * Quoted identifier flag + * + * Whether to use SQL-92 standard quoted identifier + * (double quotes) or brackets for identifier escaping. + * + * @var bool + */ protected $_quoted_identifier; + // -------------------------------------------------------------------- + /** - * Constructor + * Class constructor * * Builds the DSN if not already set. * - * @param array + * @param array $params * @return void */ public function __construct($params) @@ -85,9 +108,9 @@ class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { // -------------------------------------------------------------------- /** - * Non-persistent database connection + * Database connection * - * @param bool + * @param bool $persistent * @return object */ public function db_connect($persistent = FALSE) @@ -115,7 +138,7 @@ class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { * * 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) @@ -140,7 +163,7 @@ class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { * * 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 = '') @@ -153,49 +176,19 @@ class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { // -------------------------------------------------------------------- /** - * 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($tables) - { - return is_array($tables) ? implode(', ', $tables) : $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; + $this->qb_limit = FALSE; + $this->qb_orderby = array(); + return parent::_update($table, $values); } // -------------------------------------------------------------------- @@ -205,55 +198,65 @@ class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { * * 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 = $offset + $limit; + $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', '>=') && $offset && ! empty($this->qb_orderby)) + if (version_compare($this->version(), '9', '>=') && $this->qb_offset && ! empty($this->qb_orderby)) { - $orderby = 'ORDER BY '.implode(', ', $this->qb_orderby); + $orderby = $this->_compile_order_by(); // We have to strip the ORDER BY clause - $sql = trim(substr($sql, 0, strrpos($sql, 'ORDER BY '.$orderby))); + $sql = trim(substr($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(', ', $select); + } - return 'SELECT '.(count($this->qb_select) === 0 ? '*' : implode(', ', $this->qb_select))." FROM (\n" - .preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.$orderby.') AS '.$this->escape_identifiers('CI_rownum').', ', $sql) - ."\n) ".$this->escape_identifiers('CI_subquery') - ."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.((int) $offset + 1).' AND '.$limit; + 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); @@ -262,4 +265,4 @@ class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { } /* End of file pdo_dblib_driver.php */ -/* Location: ./system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php */ +/* Location: ./system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php */
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