Include comments for db drivers getColumnsMeta method

Author: givanz

system/db/mysqli.php

@@ -163,10 +163,11 @@ public function __construct($host = DB_HOST, $dbname = DB_NAME, $user = DB_USER,
 	/*
 	 * Get all columns for a table used for sanitizing input
 	 */
-	function getColumnsMeta($tableName) {
+	function getColumnsMeta($tableName, $comment = false) {
 		$sql =
-		'SELECT COLUMN_NAME as name, COLUMN_DEFAULT as d, IS_NULLABLE  as n, DATA_TYPE as t, EXTRA as e
-		FROM `INFORMATION_SCHEMA`.`COLUMNS` 
+		'SELECT COLUMN_NAME as name, COLUMN_DEFAULT as d, IS_NULLABLE  as n, DATA_TYPE as t, EXTRA as e, CHARACTER_MAXIMUM_LENGTH as l'
+		. ($comment ? ', COLUMN_COMMENT as c' : '') .
+		' FROM `INFORMATION_SCHEMA`.`COLUMNS` 
 		WHERE `TABLE_SCHEMA`= "' . DB_NAME . '" 
 			AND `TABLE_NAME`="' . $tableName . '"';
 

system/db/pgsql.php

@@ -100,9 +100,9 @@ public function __construct($host = DB_HOST, $dbname = DB_NAME, $user = DB_USER,
 	/*
 	 * Get all columns for a table used for sanitizing input
 	 */
-	function getColumnsMeta($tableName) {
+	function getColumnsMeta($tableName, $comment = false) {
 		$sql =
-		"SELECT data_type as t, column_name as name, column_default as d, is_nullable as n FROM information_schema.columns WHERE table_name ='$tableName'";
+		"SELECT data_type as t, column_name as name, column_default as d, is_nullable as n, character_maximum_length as l FROM information_schema.columns WHERE table_name ='$tableName'";
 
 		if ($result = $this->query($sql)) {
 			//$columns = $result->fetch_all(MYSQLI_ASSOC);

system/db/sqlite.php

@@ -93,7 +93,7 @@ public function __construct($filename = DB_HOST, $dbname = DB_NAME, $user = DB_U
 	/*
 	 * Get all columns for a table used for sanitizing input
 	 */
-	function getColumnsMeta($tableName) {
+	function getColumnsMeta($tableName, $comment = false) {
 		$sql =
 		"SELECT type as t, name, dflt_value as d, `notnull` as n FROM pragma_table_info('$tableName');";
 
@@ -258,6 +258,8 @@ public function execute($sql, $params = [], $paramTypes = []) {
 		}
 
 		if ($stmt) {
+			$result = null;
+
 			try {
 				if ($result = $stmt->execute()) {
 					$this->affected_rows = self :: $link->changes();