完善数据库驱动

library/think/db/connector/Pgsql.php

@@ -37,6 +37,7 @@ class Pgsql extends Connection
     /**
      * 取得数据表的字段信息
      * @access public
+     * @param string $tableName
      * @return array
      */
     public function getFields($tableName)
@@ -46,6 +47,7 @@ class Pgsql extends Connection
         $info            = [];
         if ($result) {
             foreach ($result as $key => $val) {
+                $val                 = array_change_key_case($val);
                 $info[$val['field']] = [
                     'name'    => $val['field'],
                     'type'    => $val['type'],
@@ -62,6 +64,7 @@ class Pgsql extends Connection
     /**
      * 取得数据库的表信息
      * @access public
+     * @param string $dbName
      * @return array
      */
     public function getTables($dbName = '')