16 files changed, 149 insertions, 138 deletions

diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 5102cc74c..81af466ef 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -555,37 +555,6 @@ class CI_DB_driver {
 
 	// --------------------------------------------------------------------
 
-	// --------------------------------------------------------------------
-
-	/**
-	 * List databases
-	 *
-	 * @access	public
-	 * @return	bool
-	 */
-	function list_databases()
-	{	
-		// Is there a cached result?
-		if (isset($this->cache['db_names']))
-		{
-			return $this->cache['db_names'];
-		}
-	
-		$query = $this->query($this->_list_database());
-		$dbs = array();
-		if ($query->num_rows() > 0)
-		{
-			foreach ($query->result_array() as $row)
-			{
-				$dbs[] = current($row);
-			}
-		}
-			
-		return $this->cache['db_names'] =& $dbs;
-	}
-
-	// --------------------------------------------------------------------
-
 	/**
 	 * Returns an array of table names
 	 * 
@@ -694,6 +663,20 @@ class CI_DB_driver {
     	
 		return $this->cache['field_names'][$table] =& $retval;
     }
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Determine if a particular field exists
+	 * @access	public
+	 * @param	string
+	 * @param	string
+	 * @return	boolean
+	 */
+	function field_exists($field_name, $table_name)
+	{	
+		return ( ! in_array($field_name, $this->list_fields($table_name))) ? FALSE : TRUE;
+	}
     
 	// --------------------------------------------------------------------
 
diff --git a/system/database/DB_utility.php b/system/database/DB_utility.php
index dc56d6524..e568bce02 100644
--- a/system/database/DB_utility.php
+++ b/system/database/DB_utility.php
@@ -87,6 +87,35 @@ class CI_DB_utility {
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases
+	 *
+	 * @access	public
+	 * @return	bool
+	 */
+	function list_databases()
+	{	
+		// Is there a cached result?
+		if (isset($this->cache['db_names']))
+		{
+			return $this->cache['db_names'];
+		}
+	
+		$query = $this->db->query($this->_list_database());
+		$dbs = array();
+		if ($query->num_rows() > 0)
+		{
+			foreach ($query->result_array() as $row)
+			{
+				$dbs[] = current($row);
+			}
+		}
+			
+		return $this->cache['db_names'] =& $dbs;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Optimize Table
 	 *
 	 * @access	public
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index 8b82ee314..cb2f48dc3 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -258,19 +258,6 @@ class CI_DB_mssql_driver extends CI_DB {
 		$row = $query->row();
 		return $row->numrows;
 	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * List databases
-	 *
-	 * @access	private
-	 * @return	bool
-	 */
-	function _list_databases()
-	{
-		return "EXEC sp_helpdb"; // Can also be: EXEC sp_databases 
-	}
 
 	// --------------------------------------------------------------------
 
diff --git a/system/database/drivers/mssql/mssql_utility.php b/system/database/drivers/mssql/mssql_utility.php
index ad13167cd..388dbe1c2 100644
--- a/system/database/drivers/mssql/mssql_utility.php
+++ b/system/database/drivers/mssql/mssql_utility.php
@@ -67,6 +67,19 @@ class CI_DB_mssql_utility extends CI_DB_utility {
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases
+	 *
+	 * @access	private
+	 * @return	bool
+	 */
+	function _list_databases()
+	{
+		return "EXEC sp_helpdb"; // Can also be: EXEC sp_databases 
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Optimize table query
 	 *
 	 * Generates a platform-specific query so that a table can be optimized
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php
index ecab648d4..253627cd9 100644
--- a/system/database/drivers/mysql/mysql_driver.php
+++ b/system/database/drivers/mysql/mysql_driver.php
@@ -296,19 +296,6 @@ class CI_DB_mysql_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * List databases
-	 *
-	 * @access	private
-	 * @return	bool
-	 */
-	function _list_databases()
-	{
-		return "SHOW DATABASES";
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * List table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
diff --git a/system/database/drivers/mysql/mysql_utility.php b/system/database/drivers/mysql/mysql_utility.php
index a81c915f6..b387ace9e 100644
--- a/system/database/drivers/mysql/mysql_utility.php
+++ b/system/database/drivers/mysql/mysql_utility.php
@@ -53,6 +53,19 @@ class CI_DB_mysql_utility extends CI_DB_utility {
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases
+	 *
+	 * @access	private
+	 * @return	bool
+	 */
+	function _list_databases()
+	{
+		return "SHOW DATABASES";
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Drop Table
 	 *
 	 * @access	private
@@ -101,7 +114,7 @@ class CI_DB_mysql_utility extends CI_DB_utility {
 	 * MySQL Export
 	 *
 	 * @access	private
-	 * @param	array	Any preferences
+	 * @param	array	Preferences
 	 * @return	mixed
 	 */
 	function _backup($params = array())
@@ -217,7 +230,6 @@ class CI_DB_mysql_utility extends CI_DB_utility {
 								
 				// Build the INSERT string
 				$output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
-	
 			}
 			
 			$output .= $newline.$newline;
diff --git a/system/database/drivers/mysqli/mysqli_driver.php b/system/database/drivers/mysqli/mysqli_driver.php
index a2c380355..4fd9f3aaa 100644
--- a/system/database/drivers/mysqli/mysqli_driver.php
+++ b/system/database/drivers/mysqli/mysqli_driver.php
@@ -288,19 +288,6 @@ class CI_DB_mysqli_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * List databases
-	 *
-	 * @access	private
-	 * @return	bool
-	 */
-	function _list_databases()
-	{
-		return "SHOW DATABASES";
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * List table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
diff --git a/system/database/drivers/mysqli/mysqli_utility.php b/system/database/drivers/mysqli/mysqli_utility.php
index f5b98b11f..a40441d20 100644
--- a/system/database/drivers/mysqli/mysqli_utility.php
+++ b/system/database/drivers/mysqli/mysqli_utility.php
@@ -62,6 +62,19 @@ class CI_DB_mysqli_utility extends CI_DB_utility {
 	{
 		return "DROP TABLE IF EXISTS ".$this->db->_escape_table($name);
 	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * List databases
+	 *
+	 * @access	private
+	 * @return	bool
+	 */
+	function _list_databases()
+	{
+		return "SHOW DATABASES";
+	}
 	
 	// --------------------------------------------------------------------
 
diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index b43b4c41f..e83c640bd 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -399,19 +399,6 @@ class CI_DB_oci8_driver extends CI_DB {
         return $row->NUMROWS;
     }
 
-	// --------------------------------------------------------------------
-
-	/**
-	 * List databases
-	 *
-	 * @access	private
-	 * @return	bool
-	 */
-	function _list_databases()
-	{
-		return FALSE;
-	}
-
     // --------------------------------------------------------------------
 
     /**
diff --git a/system/database/drivers/oci8/oci8_utility.php b/system/database/drivers/oci8/oci8_utility.php
index b6503de63..b1d539ad6 100644
--- a/system/database/drivers/oci8/oci8_utility.php
+++ b/system/database/drivers/oci8/oci8_utility.php
@@ -54,6 +54,19 @@ class CI_DB_oci8_utility extends CI_DB_utility {
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases
+	 *
+	 * @access	private
+	 * @return	bool
+	 */
+	function _list_databases()
+	{
+		return FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Drop Table
 	 *
 	 * @access	private
diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index 0f002cc1b..4bd6e1106 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -263,24 +263,6 @@ class CI_DB_odbc_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * List databases
-	 *
-	 * @access	private
-	 * @return	bool
-	 */
-	function _list_databases()
-	{
-		// Not sure if ODBC lets you list all databases...	
-		if ($this->db_debug)
-		{
-			return $this->display_error('db_unsuported_feature');
-		}
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Show table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
diff --git a/system/database/drivers/odbc/odbc_utility.php b/system/database/drivers/odbc/odbc_utility.php
index 6d0fb79f1..5a0e365ef 100644
--- a/system/database/drivers/odbc/odbc_utility.php
+++ b/system/database/drivers/odbc/odbc_utility.php
@@ -66,6 +66,24 @@ class CI_DB_odbc_utility extends CI_DB_utility {
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases
+	 *
+	 * @access	private
+	 * @return	bool
+	 */
+	function _list_databases()
+	{
+		// Not sure if ODBC lets you list all databases...	
+		if ($this->db->db_debug)
+		{
+			return $this->db->display_error('db_unsuported_feature');
+		}
+		return FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Drop Table
 	 *
 	 * @access	private
diff --git a/system/database/drivers/postgre/postgre_driver.php b/system/database/drivers/postgre/postgre_driver.php
index f14395638..340d65046 100644
--- a/system/database/drivers/postgre/postgre_driver.php
+++ b/system/database/drivers/postgre/postgre_driver.php
@@ -290,19 +290,6 @@ class CI_DB_postgre_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * List databases
-	 *
-	 * @access	private
-	 * @return	bool
-	 */
-	function _list_databases()
-	{
-		return "SELECT datname FROM pg_database";
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Show table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
diff --git a/system/database/drivers/postgre/postgre_utility.php b/system/database/drivers/postgre/postgre_utility.php
index 46c98cc7d..038aa26cd 100644
--- a/system/database/drivers/postgre/postgre_utility.php
+++ b/system/database/drivers/postgre/postgre_utility.php
@@ -54,6 +54,19 @@ class CI_DB_postgre_utility extends CI_DB_utility {
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases
+	 *
+	 * @access	private
+	 * @return	bool
+	 */
+	function _list_databases()
+	{
+		return "SELECT datname FROM pg_database";
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Drop Table
 	 *
 	 * @access	private
diff --git a/system/database/drivers/sqlite/sqlite_driver.php b/system/database/drivers/sqlite/sqlite_driver.php
index f57c4b8c8..9da50b676 100644
--- a/system/database/drivers/sqlite/sqlite_driver.php
+++ b/system/database/drivers/sqlite/sqlite_driver.php
@@ -282,28 +282,6 @@ class CI_DB_sqlite_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * List databases
-	 *
-	 * I don't believe you can do a database listing with SQLite
-	 * since each database is its own file.  I suppose we could
-	 * try reading a directory looking for SQLite files, but 
-	 * that doesn't seem like a terribly good idea
-	 *
-	 * @access	private
-	 * @return	bool
-	 */
-	function _list_databases()
-	{
-		if ($this->db_debug)
-		{
-			return $this->display_error('db_unsuported_feature');
-		}
-		return array();
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * List table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
diff --git a/system/database/drivers/sqlite/sqlite_utility.php b/system/database/drivers/sqlite/sqlite_utility.php
index 801660d94..19b06bd6d 100644
--- a/system/database/drivers/sqlite/sqlite_utility.php
+++ b/system/database/drivers/sqlite/sqlite_utility.php
@@ -64,6 +64,28 @@ class CI_DB_sqlite_utility extends CI_DB_utility {
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases
+	 *
+	 * I don't believe you can do a database listing with SQLite
+	 * since each database is its own file.  I suppose we could
+	 * try reading a directory looking for SQLite files, but 
+	 * that doesn't seem like a terribly good idea
+	 *
+	 * @access	private
+	 * @return	bool
+	 */
+	function _list_databases()
+	{
+		if ($this->db_debug)
+		{
+			return $this->display_error('db_unsuported_feature');
+		}
+		return array();
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Drop Table
 	 *
 	 *  Unsupported feature in SQLite