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-rw-r--r--system/database/DB_driver.php101
1 files changed, 21 insertions, 80 deletions
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 0b13a2f82..54740c309 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -380,7 +380,8 @@ abstract class CI_DB_driver {
/**
* Initialize Database Settings
*
- * @return bool
+ * @return void
+ * @throws RuntimeException In case of failure
*/
public function initialize()
{
@@ -392,7 +393,7 @@ abstract class CI_DB_driver {
*/
if ($this->conn_id)
{
- return TRUE;
+ return;
}
// ----------------------------------------------------------------
@@ -429,19 +430,9 @@ abstract class CI_DB_driver {
// We still don't have a connection?
if ( ! $this->conn_id)
{
- log_message('error', 'Unable to connect to the database');
-
- if ($this->db_debug)
- {
- $this->display_error('db_unable_to_connect');
- }
-
- return FALSE;
+ throw new RuntimeException('Unable to connect to the database.');
}
}
-
- // Now we set the character set and that's all
- return $this->db_set_charset($this->char_set);
}
// --------------------------------------------------------------------
@@ -517,31 +508,6 @@ abstract class CI_DB_driver {
// --------------------------------------------------------------------
/**
- * Set client character set
- *
- * @param string
- * @return bool
- */
- public function db_set_charset($charset)
- {
- if (method_exists($this, '_db_set_charset') && ! $this->_db_set_charset($charset))
- {
- log_message('error', 'Unable to set database connection charset: '.$charset);
-
- if ($this->db_debug)
- {
- $this->display_error('db_unable_to_set_charset', $charset);
- }
-
- return FALSE;
- }
-
- return TRUE;
- }
-
- // --------------------------------------------------------------------
-
- /**
* The name of the platform in use (mysql, mssql, etc...)
*
* @return string
@@ -634,7 +600,6 @@ abstract class CI_DB_driver {
// cached query if it exists
if ($this->cache_on === TRUE && $return_object === TRUE && $this->_cache_init())
{
- $this->load_rdriver();
if (FALSE !== ($cache = $this->CACHE->read($sql)))
{
return $cache;
@@ -718,9 +683,9 @@ abstract class CI_DB_driver {
return TRUE;
}
- // Load and instantiate the result driver
- $driver = $this->load_rdriver();
- $RES = new $driver($this);
+ // Instantiate the driver-specific result class
+ $driver = 'CI_DB_'.$this->dbdriver.'_result';
+ $RES = new $driver($this);
// Is query caching enabled? If so, we'll serialize the
// result object and save it to a cache file.
@@ -750,26 +715,6 @@ abstract class CI_DB_driver {
// --------------------------------------------------------------------
/**
- * Load the result drivers
- *
- * @return string the name of the result class
- */
- public function load_rdriver()
- {
- $driver = 'CI_DB_'.$this->dbdriver.'_result';
-
- if ( ! class_exists($driver, FALSE))
- {
- require_once(BASEPATH.'database/DB_result.php');
- require_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result.php');
- }
-
- return $driver;
- }
-
- // --------------------------------------------------------------------
-
- /**
* Simple Query
* This is a simplified version of the query() function. Internally
* we only use it when running transaction commands since they do
@@ -780,14 +725,7 @@ abstract class CI_DB_driver {
*/
public function simple_query($sql)
{
- if ( ! $this->conn_id)
- {
- if ( ! $this->initialize())
- {
- return FALSE;
- }
- }
-
+ empty($this->conn_id) && $this->initialize();
return $this->_execute($sql);
}
@@ -1383,10 +1321,11 @@ abstract class CI_DB_driver {
*
* This function escapes column and table names
*
- * @param mixed
+ * @param mixed $item Identifier to escape
+ * @param bool $split Whether to split identifiers when a dot is encountered
* @return mixed
*/
- public function escape_identifiers($item)
+ public function escape_identifiers($item, $split = TRUE)
{
if ($this->_escape_char === '' OR empty($item) OR in_array($item, $this->_reserved_identifiers))
{
@@ -1407,22 +1346,22 @@ abstract class CI_DB_driver {
return $item;
}
- static $preg_ec = array();
+ static $preg_ec;
if (empty($preg_ec))
{
if (is_array($this->_escape_char))
{
$preg_ec = array(
- preg_quote($this->_escape_char[0], '/'),
- preg_quote($this->_escape_char[1], '/'),
+ preg_quote($this->_escape_char[0]),
+ preg_quote($this->_escape_char[1]),
$this->_escape_char[0],
$this->_escape_char[1]
);
}
else
{
- $preg_ec[0] = $preg_ec[1] = preg_quote($this->_escape_char, '/');
+ $preg_ec[0] = $preg_ec[1] = preg_quote($this->_escape_char);
$preg_ec[2] = $preg_ec[3] = $this->_escape_char;
}
}
@@ -1431,11 +1370,13 @@ abstract class CI_DB_driver {
{
if (strpos($item, '.'.$id) !== FALSE)
{
- return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?\./i', $preg_ec[2].'$1'.$preg_ec[3].'.', $item);
+ return preg_replace('#'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?\.#i', $preg_ec[2].'$1'.$preg_ec[3].'.', $item);
}
}
- return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?(\.)?/i', $preg_ec[2].'$1'.$preg_ec[3].'$2', $item);
+ $dot = ($split !== FALSE) ? '\.' : '';
+
+ return preg_replace('#'.$preg_ec[0].'?([^'.$preg_ec[1].$dot.']+)'.$preg_ec[1].'?(\.)?#i', $preg_ec[2].'$1'.$preg_ec[3].'$2', $item);
}
// --------------------------------------------------------------------
@@ -1849,14 +1790,14 @@ abstract class CI_DB_driver {
if ($offset = strripos($item, ' AS '))
{
$alias = ($protect_identifiers)
- ? substr($item, $offset, 4).$this->escape_identifiers(substr($item, $offset + 4))
+ ? substr($item, $offset, 4).$this->escape_identifiers(substr($item, $offset + 4), FALSE)
: substr($item, $offset);
$item = substr($item, 0, $offset);
}
elseif ($offset = strrpos($item, ' '))
{
$alias = ($protect_identifiers)
- ? ' '.$this->escape_identifiers(substr($item, $offset + 1))
+ ? ' '.$this->escape_identifiers(substr($item, $offset + 1), FALSE)
: substr($item, $offset);
$item = substr($item, 0, $offset);
}