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-rw-r--r--system/database/DB_driver.php356
1 files changed, 269 insertions, 87 deletions
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index ef77b594e..b12042bde 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -45,11 +45,13 @@ abstract class CI_DB_driver {
public $password;
public $hostname;
public $database;
- public $dbdriver = 'mysql';
+ public $dbdriver = 'mysqli';
+ public $subdriver;
public $dbprefix = '';
public $char_set = 'utf8';
public $dbcollat = 'utf8_general_ci';
public $autoinit = TRUE; // Whether to automatically initialize the DB
+ public $compress = TRUE;
public $swap_pre = '';
public $port = '';
public $pconnect = FALSE;
@@ -77,6 +79,23 @@ abstract class CI_DB_driver {
protected $_protect_identifiers = TRUE;
protected $_reserved_identifiers = array('*'); // Identifiers that should NOT be escaped
+ // clause and character used for LIKE escape sequences
+ protected $_like_escape_str = " ESCAPE '%s' ";
+ protected $_like_escape_chr = '!';
+
+ /**
+ * 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() functions.
+ */
+ protected $_count_string = 'SELECT COUNT(*) AS ';
+
+ /**
+ * Constructor
+ *
+ * @param array
+ * @return void
+ */
public function __construct($params)
{
if (is_array($params))
@@ -113,7 +132,7 @@ abstract class CI_DB_driver {
// ----------------------------------------------------------------
// Connect to the database and set the connection ID
- $this->conn_id = ($this->pconnect == FALSE) ? $this->db_connect() : $this->db_pconnect();
+ $this->conn_id = ($this->pconnect === FALSE) ? $this->db_connect() : $this->db_pconnect();
// No connection resource? Check if there is a failover else throw an error
if ( ! $this->conn_id)
@@ -131,7 +150,7 @@ abstract class CI_DB_driver {
}
// Try to connect
- $this->conn_id = ($this->pconnect == FALSE) ? $this->db_connect() : $this->db_pconnect();
+ $this->conn_id = ($this->pconnect === FALSE) ? $this->db_connect() : $this->db_pconnect();
// If a connection is made break the foreach loop
if ($this->conn_id)
@@ -295,17 +314,21 @@ abstract class CI_DB_driver {
* @param array An array of binding data
* @return mixed
*/
- public function query($sql, $binds = FALSE, $return_object = TRUE)
+ public function query($sql, $binds = FALSE, $return_object = NULL)
{
- if ($sql == '')
+ if ($sql === '')
{
log_message('error', 'Invalid query: '.$sql);
return ($this->db_debug) ? $this->display_error('db_invalid_query') : FALSE;
}
+ elseif ( ! is_bool($return_object))
+ {
+ $return_object = ! $this->is_write_type($sql);
+ }
// Verify table prefix and replace if necessary
- if ($this->dbprefix != '' && $this->swap_pre != '' && $this->dbprefix != $this->swap_pre)
+ if ($this->dbprefix !== '' && $this->swap_pre !== '' && $this->dbprefix !== $this->swap_pre)
{
$sql = preg_replace('/(\W)'.$this->swap_pre.'(\S+?)/', '\\1'.$this->dbprefix.'\\2', $sql);
}
@@ -319,7 +342,7 @@ abstract class CI_DB_driver {
// Is query caching enabled? If the query is a "read type"
// we will load the caching class and return the previously
// cached query if it exists
- if ($this->cache_on == TRUE && stripos($sql, 'SELECT') !== FALSE && $this->_cache_init())
+ if ($this->cache_on === TRUE && $return_object === TRUE && $this->_cache_init())
{
$this->load_rdriver();
if (FALSE !== ($cache = $this->CACHE->read($sql)))
@@ -328,8 +351,8 @@ abstract class CI_DB_driver {
}
}
- // Save the query for debugging
- if ($this->save_queries == TRUE)
+ // Save the query for debugging
+ if ($this->save_queries === TRUE)
{
$this->queries[] = $sql;
}
@@ -340,7 +363,7 @@ abstract class CI_DB_driver {
// Run the Query
if (FALSE === ($this->result_id = $this->simple_query($sql)))
{
- if ($this->save_queries == TRUE)
+ if ($this->save_queries === TRUE)
{
$this->query_times[] = 0;
}
@@ -352,7 +375,7 @@ abstract class CI_DB_driver {
$error = $this->error();
// Log errors
- log_message('error', 'Query error: '.$error['message']);
+ log_message('error', 'Query error: '.$error['message'].' - Invalid query: '.$sql);
if ($this->db_debug)
{
@@ -373,7 +396,7 @@ abstract class CI_DB_driver {
$time_end = microtime(TRUE);
$this->benchmark += $time_end - $time_start;
- if ($this->save_queries == TRUE)
+ if ($this->save_queries === TRUE)
{
$this->query_times[] = $time_end - $time_start;
}
@@ -381,13 +404,11 @@ abstract class CI_DB_driver {
// Increment the query counter
$this->query_count++;
- // Was the query a "write" type?
- // If so we'll simply return true
- if ($this->is_write_type($sql) === TRUE)
+ // Will we have a result object instantiated? If not - we'll simply return TRUE
+ if ($return_object !== TRUE)
{
- // If caching is enabled we'll auto-cleanup any
- // existing files related to this particular URI
- if ($this->cache_on == TRUE && $this->cache_autodel == TRUE && $this->_cache_init())
+ // If caching is enabled we'll auto-cleanup any existing files related to this particular URI
+ if ($this->cache_on === TRUE && $this->cache_autodel === TRUE && $this->_cache_init())
{
$this->CACHE->delete();
}
@@ -396,8 +417,6 @@ abstract class CI_DB_driver {
}
// Return TRUE if we don't need to create a result object
- // Currently only the Oracle driver uses this when stored
- // procedures are used
if ($return_object !== TRUE)
{
return TRUE;
@@ -409,7 +428,7 @@ abstract class CI_DB_driver {
// Is query caching enabled? If so, we'll serialize the
// result object and save it to a cache file.
- if ($this->cache_on == TRUE && $this->_cache_init())
+ if ($this->cache_on === TRUE && $this->_cache_init())
{
// We'll create a new instance of the result object
// only without the platform specific driver since
@@ -596,35 +615,53 @@ abstract class CI_DB_driver {
*/
public function compile_binds($sql, $binds)
{
- if (strpos($sql, $this->bind_marker) === FALSE)
+ if (empty($binds) OR empty($this->bind_marker) OR strpos($sql, $this->bind_marker) === FALSE)
{
return $sql;
}
-
- if ( ! is_array($binds))
+ elseif ( ! is_array($binds))
{
$binds = array($binds);
+ $bind_count = 1;
+ }
+ else
+ {
+ // Make sure we're using numeric keys
+ $binds = array_values($binds);
+ $bind_count = count($binds);
}
- // Get the sql segments around the bind markers
- $segments = explode($this->bind_marker, $sql);
+ // We'll need the marker length later
+ $ml = strlen($this->bind_marker);
- // The count of bind should be 1 less then the count of segments
- // If there are more bind arguments trim it down
- if (count($binds) >= count($segments))
+ // Make sure not to replace a chunk inside a string that happens to match the bind marker
+ if ($c = preg_match_all("/'[^']*'/i", $sql, $matches))
{
- $binds = array_slice($binds, 0, count($segments)-1);
+ $c = preg_match_all('/'.preg_quote($this->bind_marker).'/i',
+ str_replace($matches[0],
+ str_replace($this->bind_marker, str_repeat(' ', $ml), $matches[0]),
+ $sql, $c),
+ $matches, PREG_OFFSET_CAPTURE);
+
+ // Bind values' count must match the count of markers in the query
+ if ($bind_count !== $c)
+ {
+ return $sql;
+ }
+ }
+ elseif (($c = preg_match_all('/'.preg_quote($this->bind_marker).'/i', $sql, $matches, PREG_OFFSET_CAPTURE)) !== $bind_count)
+ {
+ return $sql;
}
- // Construct the binded query
- $result = $segments[0];
- $i = 0;
- foreach ($binds as $bind)
+ do
{
- $result .= $this->escape($bind).$segments[++$i];
+ $c--;
+ $sql = substr_replace($sql, $this->escape($binds[$c]), $matches[0][$c][1], $ml);
}
+ while ($c !== 0);
- return $result;
+ return $sql;
}
// --------------------------------------------------------------------
@@ -637,7 +674,7 @@ abstract class CI_DB_driver {
*/
public function is_write_type($sql)
{
- return (bool) preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD DATA|COPY|ALTER|RENAME|GRANT|REVOKE|LOCK|UNLOCK|REINDEX)\s+/i', $sql);
+ return (bool) preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD|COPY|ALTER|RENAME|GRANT|REVOKE|LOCK|UNLOCK|REINDEX)\s+/i', $sql);
}
// --------------------------------------------------------------------
@@ -742,6 +779,35 @@ abstract class CI_DB_driver {
// --------------------------------------------------------------------
/**
+ * "Count All" query
+ *
+ * Generates a platform-specific query string that counts all records in
+ * the specified database
+ *
+ * @param string
+ * @return int
+ */
+ public function count_all($table = '')
+ {
+ if ($table === '')
+ {
+ return 0;
+ }
+
+ $query = $this->query($this->_count_string.$this->escape_identifiers('numrows').' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE));
+ if ($query->num_rows() === 0)
+ {
+ return 0;
+ }
+
+ $query = $query->row();
+ $this->_reset_select();
+ return (int) $query->numrows;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Returns an array of table names
*
* @return array
@@ -808,7 +874,7 @@ abstract class CI_DB_driver {
// --------------------------------------------------------------------
/**
- * Fetch MySQL Field Names
+ * Fetch Field Names
*
* @param string the table name
* @return array
@@ -821,7 +887,7 @@ abstract class CI_DB_driver {
return $this->data_cache['field_names'][$table];
}
- if ($table == '')
+ if ($table === '')
{
return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
}
@@ -889,7 +955,7 @@ abstract class CI_DB_driver {
*/
public function field_data($table = '')
{
- if ($table == '')
+ if ($table === '')
{
return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
}
@@ -905,34 +971,57 @@ abstract class CI_DB_driver {
*
* This function escapes column and table names
*
- * @param string
- * @return string
+ * @param mixed
+ * @return mixed
*/
public function escape_identifiers($item)
{
- if ($this->_escape_char == '')
+ if ($this->_escape_char === '' OR empty($item))
{
return $item;
}
-
- foreach ($this->_reserved_identifiers as $id)
+ elseif (is_array($item))
{
- if (strpos($item, '.'.$id) !== FALSE)
+ foreach ($item as $key => $value)
{
- $item = str_replace('.', $this->_escape_char.'.', $item);
+ $item[$key] = $this->escape_identifiers($value);
+ }
+
+ return $item;
+ }
+ // Avoid breaking functions and literal values inside queries
+ elseif (ctype_digit($item) OR $item[0] === "'" OR ($this->_escape_char !== '"' && $item[0] === '"') OR strpos($item, '(') !== FALSE)
+ {
+ return $item;
+ }
+
+ static $preg_ec = array();
- // remove duplicates if the user already included the escape
- return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $this->_escape_char.$item);
+ 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]),
+ $this->_escape_char[0], $this->_escape_char[1]
+ );
+ }
+ else
+ {
+ $preg_ec[0] = $preg_ec[1] = preg_quote($this->_escape_char);
+ $preg_ec[2] = $preg_ec[3] = $this->_escape_char;
}
}
- if (strpos($item, '.') !== FALSE)
+ foreach ($this->_reserved_identifiers as $id)
{
- $item = str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item);
+ if (strpos($item, '.'.$id) !== FALSE)
+ {
+ return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?\./i', $preg_ec[2].'$1'.$preg_ec[3].'.', $item);
+ }
}
- // remove duplicates if the user already included the escape
- return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $this->_escape_char.$item.$this->_escape_char);
+ return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?(\.)?/i', $preg_ec[2].'$1'.$preg_ec[3].'$2', $item);
}
// --------------------------------------------------------------------
@@ -960,6 +1049,23 @@ abstract class CI_DB_driver {
// --------------------------------------------------------------------
/**
+ * Insert statement
+ *
+ * Generates a platform-specific insert string from the supplied data
+ *
+ * @param string the table name
+ * @param array the insert keys
+ * @param array the insert values
+ * @return string
+ */
+ protected function _insert($table, $keys, $values)
+ {
+ return 'INSERT INTO '.$table.' ('.implode(', ', $keys).') VALUES ('.implode(', ', $values).')';
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Generate an update string
*
* @param string the table upon which the query will be performed
@@ -969,7 +1075,7 @@ abstract class CI_DB_driver {
*/
public function update_string($table, $data, $where)
{
- if ($where == '')
+ if ($where === '')
{
return FALSE;
}
@@ -989,7 +1095,7 @@ abstract class CI_DB_driver {
$dest = array();
foreach ($where as $key => $val)
{
- $prefix = (count($dest) == 0) ? '' : ' AND ';
+ $prefix = (count($dest) === 0) ? '' : ' AND ';
$key = $this->protect_identifiers($key);
if ($val !== '')
@@ -1012,6 +1118,41 @@ abstract class CI_DB_driver {
// --------------------------------------------------------------------
/**
+ * Update statement
+ *
+ * Generates a platform-specific update string from the supplied data
+ *
+ * @param string the table name
+ * @param array the update data
+ * @param array the where clause
+ * @param array the orderby clause
+ * @param array the limit clause
+ * @param array the like clause
+ * @return string
+ */
+ protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array())
+ {
+ foreach ($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
+ .(count($orderby) > 0 ? ' ORDER BY '.implode(', ', $orderby) : '')
+ .($limit ? ' LIMIT '.$limit : '');
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Tests whether the string has an SQL operator
*
* @param string
@@ -1019,7 +1160,21 @@ abstract class CI_DB_driver {
*/
protected function _has_operator($str)
{
- return (bool) preg_match('/(\s|<|>|!|=|IS NULL|IS NOT NULL)/i', trim($str));
+ return (bool) preg_match('/(\s|<|>|!|=|IS NULL|IS NOT NULL|BETWEEN)/i', trim($str));
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Returns the SQL string operator
+ *
+ * @param string
+ * @return string
+ */
+ protected function _get_operator($str)
+ {
+ return preg_match('/(=|!|<|>| IS NULL| IS NOT NULL| BETWEEN)/i', $str, $match)
+ ? $match[1] : FALSE;
}
// --------------------------------------------------------------------
@@ -1033,7 +1188,7 @@ abstract class CI_DB_driver {
*/
public function call_function($function)
{
- $driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_';
+ $driver = ($this->dbdriver === 'postgre') ? 'pg_' : $this->dbdriver.'_';
if (FALSE === strpos($driver, $function))
{
@@ -1087,7 +1242,6 @@ abstract class CI_DB_driver {
return $this->cache_on = FALSE;
}
-
// --------------------------------------------------------------------
/**
@@ -1152,7 +1306,7 @@ abstract class CI_DB_driver {
{
if ($this->conn_id)
{
- $this->_close($this->conn_id);
+ $this->_close();
$this->conn_id = FALSE;
}
}
@@ -1160,6 +1314,20 @@ abstract class CI_DB_driver {
// --------------------------------------------------------------------
/**
+ * Close DB Connection
+ *
+ * This method would be overriden by most of the drivers.
+ *
+ * @return void
+ */
+ protected function _close()
+ {
+ $this->conn_id = FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Display an error message
*
* @param string the error message
@@ -1174,13 +1342,13 @@ abstract class CI_DB_driver {
$heading = $LANG->line('db_error_heading');
- if ($native == TRUE)
+ if ($native === TRUE)
{
$message = (array) $error;
}
else
{
- $message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $error;
+ $message = is_array($error) ? $error : array(str_replace('%s', $swap, $LANG->line($error)));
}
// Find the most likely culprit of the error by going through
@@ -1189,10 +1357,16 @@ abstract class CI_DB_driver {
$trace = debug_backtrace();
foreach ($trace as $call)
{
- if (isset($call['file']) && strpos($call['file'], BASEPATH.'database') === FALSE)
+ // We'll need this on Windows, as APPPATH and BASEPATH will always use forward slashes
+ if (DIRECTORY_SEPARATOR !== '/')
+ {
+ $call['file'] = str_replace('\\', '/', $call['file']);
+ }
+
+ if (isset($call['file'], $call['class']) && strpos($call['file'], $basepath.'database') === FALSE && strpos($call['class'], 'Loader') !== FALSE)
{
// Found it - use a relative path for safety
- $message[] = 'Filename: '.str_replace(array(BASEPATH, APPPATH), '', $call['file']);
+ $message[] = 'Filename: '.str_replace(array(APPPATH, BASEPATH), '', $call['file']);
$message[] = 'Line Number: '.$call['line'];
break;
}
@@ -1243,34 +1417,43 @@ abstract class CI_DB_driver {
$escaped_array = array();
foreach ($item as $k => $v)
{
- $escaped_array[$this->protect_identifiers($k)] = $this->protect_identifiers($v);
+ $escaped_array[$this->protect_identifiers($k)] = $this->protect_identifiers($v, $prefix_single, $protect_identifiers, $field_exists);
}
return $escaped_array;
}
+ // This is basically a bug fix for queries that use MAX, MIN, etc.
+ // If a parenthesis is found we know that we do not need to
+ // escape the data or add a prefix. There's probably a more graceful
+ // way to deal with this, but I'm not thinking of it -- Rick
+ if (strpos($item, '(') !== FALSE)
+ {
+ return $item;
+ }
+
// Convert tabs or multiple spaces into single spaces
- $item = preg_replace('/[\t ]+/', ' ', $item);
+ $item = preg_replace('/\s+/', ' ', $item);
// If the item has an alias declaration we remove it and set it aside.
- // Basically we remove everything to the right of the first space
- if (strpos($item, ' ') !== FALSE)
+ // Note: strripos() is used in order to support spaces in table names
+ if ($offset = strripos($item, ' AS '))
{
- $alias = strstr($item, ' ');
- $item = substr($item, 0, - strlen($alias));
+ $alias = ($protect_identifiers)
+ ? substr($item, $offset, 4).$this->escape_identifiers(substr($item, $offset + 4))
+ : substr($item, $offset);
+ $item = substr($item, 0, $offset);
}
- else
+ elseif ($offset = strrpos($item, ' '))
{
- $alias = '';
+ $alias = ($protect_identifiers)
+ ? ' '.$this->escape_identifiers(substr($item, $offset + 1))
+ : substr($item, $offset);
+ $item = substr($item, 0, $offset);
}
-
- // This is basically a bug fix for queries that use MAX, MIN, etc.
- // If a parenthesis is found we know that we do not need to
- // escape the data or add a prefix. There's probably a more graceful
- // way to deal with this, but I'm not thinking of it -- Rick
- if (strpos($item, '(') !== FALSE)
+ else
{
- return $item.$alias;
+ $alias = '';
}
// Break the string apart if it contains periods, then insert the table prefix
@@ -1302,7 +1485,7 @@ abstract class CI_DB_driver {
}
// Is there a table prefix defined in the config file? If not, no need to do anything
- if ($this->dbprefix != '')
+ if ($this->dbprefix !== '')
{
// We now add the table prefix based on some logic.
// Do we have 4 segments (hostname.database.table.column)?
@@ -1326,13 +1509,13 @@ abstract class CI_DB_driver {
// This flag is set when the supplied $item does not contain a field name.
// This can happen when this function is being called from a JOIN.
- if ($field_exists == FALSE)
+ if ($field_exists === FALSE)
{
$i++;
}
// Verify table prefix and replace if necessary
- if ($this->swap_pre != '' && strpos($parts[$i], $this->swap_pre) === 0)
+ if ($this->swap_pre !== '' && strpos($parts[$i], $this->swap_pre) === 0)
{
$parts[$i] = preg_replace('/^'.$this->swap_pre.'(\S+?)/', $this->dbprefix.'\\1', $parts[$i]);
}
@@ -1355,15 +1538,15 @@ abstract class CI_DB_driver {
}
// Is there a table prefix? If not, no need to insert it
- if ($this->dbprefix != '')
+ if ($this->dbprefix !== '')
{
// Verify table prefix and replace if necessary
- if ($this->swap_pre != '' && strpos($item, $this->swap_pre) === 0)
+ if ($this->swap_pre !== '' && strpos($item, $this->swap_pre) === 0)
{
$item = preg_replace('/^'.$this->swap_pre.'(\S+?)/', $this->dbprefix.'\\1', $item);
}
// Do we prefix an item with no segments?
- elseif ($prefix_single == TRUE && strpos($item, $this->dbprefix) !== 0)
+ elseif ($prefix_single === TRUE && strpos($item, $this->dbprefix) !== 0)
{
$item = $this->dbprefix.$item;
}
@@ -1381,8 +1564,7 @@ abstract class CI_DB_driver {
/**
* Dummy method that allows Query Builder class to be disabled
- *
- * This function is used extensively by every db driver.
+ * and keep count_all() working.
*
* @return void
*/
@@ -1393,4 +1575,4 @@ abstract class CI_DB_driver {
}
/* End of file DB_driver.php */
-/* Location: ./system/database/DB_driver.php */
+/* Location: ./system/database/DB_driver.php */ \ No newline at end of file
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-11-08 17:06:41 +0100