diff --git a/convention.php b/convention.php
index bab1a497..7bb766d1 100644
--- a/convention.php
+++ b/convention.php
@@ -155,6 +155,7 @@ return [
     // +----------------------------------------------------------------------
 
     'db_fields_strict'       => true,
+    'db_attr_case'           => \PDO::CASE_LOWER,
     'database'               => [
         // 数据库类型
         'type'        => 'mysql',
diff --git a/library/think/Model.php b/library/think/Model.php
index d92381b2..7cbfb054 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -33,7 +33,7 @@ class Model
     // 数据库名称
     protected $dbName = '';
     // 数据表字段大小写
-    protected $attrCase = \PDO::CASE_LOWER;
+    protected $attrCase = null;
     //数据库配置
     protected $connection = [];
     // 数据表名（不包含表前缀）
@@ -98,8 +98,8 @@ class Model
             $this->dbName = $config['db_name'];
         }
 
-        if (isset($config['attr_case'])) {
-            $this->attrCase = $config['attr_case'];
+        if (is_null($this->attrCase)) {
+            $this->attrCase = Config::get('db_attr_case');
         }
 
         // 数据库初始化操作
diff --git a/library/think/db/Driver.php b/library/think/db/Driver.php
index f94ac952..cac385cb 100644
--- a/library/think/db/Driver.php
+++ b/library/think/db/Driver.php
@@ -928,21 +928,21 @@ abstract class Driver
      * 批量更新某字段
      * @access public
      * @param mixed $field 字段名
-     * @param mixed $pk 主键名 
-     * @param mixed $dataSet 数据集 
+     * @param mixed $pk 主键名
+     * @param mixed $dataSet 数据集
      * @param mixed $operator 运算符
      * @param array $options 参数表达式
      **/
-    public function updateFieldAll($field,$pk,$dataSet,$operator = '=',$options = [])
+    public function updateFieldAll($field, $pk, $dataSet, $operator = '=', $options = [])
     {
-        $values      = [];
+        $values     = [];
         $this->bind = array_merge($this->bind, !empty($options['bind']) ? $options['bind'] : []);
-        $field = $this->parseKey($field);
-        $pk = $this->parseKey($pk);
-        if(in_array($operator,['+','-'])){
+        $field      = $this->parseKey($field);
+        $pk         = $this->parseKey($pk);
+        if (in_array($operator, ['+', '-'])) {
             $operator = '= ' . $field . $operator;
         }
-        
+
         $value = '';
         foreach ($dataSet as $key => $val) {
             if (is_array($val) && 'exp' == $val[0]) {
@@ -953,22 +953,22 @@ abstract class Driver
                 if (0 === strpos($val, ':') && isset($this->bind[substr($val, 1)])) {
                     $value = $val;
                 } else {
-                    $name    = count($this->bind);
-                    $value = ':' .  $_SERVER['REQUEST_TIME'] . '_' . $name;
-                    $this->bindParam( $_SERVER['REQUEST_TIME'] . '_' . $name, $val);
+                    $name  = count($this->bind);
+                    $value = ':' . $_SERVER['REQUEST_TIME'] . '_' . $name;
+                    $this->bindParam($_SERVER['REQUEST_TIME'] . '_' . $name, $val);
                 }
             }
             //没使用过非数字主键,怎么处理比较合适?
-            $values[] = " WHEN " .$key." THEN " . $value;
-         }
-         
-        $sql = 'UPDATE ' . $this->parseTable($options['table']) . ' SET ' . $field . $operator . ' CASE ' . $pk . implode(' ', $values) . ' END ' ;
+            $values[] = " WHEN " . $key . " THEN " . $value;
+        }
+
+        $sql = 'UPDATE ' . $this->parseTable($options['table']) . ' SET ' . $field . $operator . ' CASE ' . $pk . implode(' ', $values) . ' END ';
         //查询条件需和WHEN THEN对一致
-        $sql .= ' WHERE ' . $pk . ' in (' . implode(',',array_map([$this,'parseValue'],array_keys($dataSet))) . ')';
+        $sql .= ' WHERE ' . $pk . ' in (' . implode(',', array_map([$this, 'parseValue'], array_keys($dataSet))) . ')';
         $sql .= $this->parseComment(!empty($options['comment']) ? $options['comment'] : '');
         return $this->execute($sql, $this->getBindParams(true), !empty($options['fetch_sql']) ? true : false);
     }
-    
+
     /**
      * 批量插入记录
      * @access public