diff --git a/db.js b/db.js
index 03e9d38..fe10e5d 100644
--- a/db.js
+++ b/db.js
@@ -51,7 +51,7 @@ class DB {
     return await this.execQuery(sql, params);
   }
 
-  async update(tblName, whereList, fieldList) {
+  async updateOld(tblName, whereList, fieldList) {
     const params = [];
     let sql = 'UPDATE `' + tblName + '` SET ';
 
@@ -70,6 +70,33 @@ class DB {
     return await this.execScript(sql, params);
   }
 
+  async update(tblName, whereList, fieldList) {
+    const params = [];
+    let sql = 'UPDATE `' + tblName + '` SET ';
+
+    fieldList.forEach((item, index) => {
+      const suffix = (index + 1 < fieldList.length ? ',': '');
+      if (item[0][0] == '!') {
+        if (typeof item[1] == 'function') {
+          sql += ' `' + item[0].substr(1) + '`=' + item[1]() + suffix;
+        } else {
+          sql += ' `' + item[0].substr(1) + '`=' + item[1] + suffix;
+        }
+      } else {
+        sql += ' `' + item[0] + '`=?' + suffix;
+        params.push(item[1]);
+      }
+    });
+
+    sql += ' WHERE 1=1';
+    whereList.forEach((item, index) => {
+      sql += ' AND ' + item[0] + '=?';
+      params.push(item[1]);
+    });
+
+    return await this.execScript(sql, params);
+  }
+
   async insert(tblName, fieldList) {
     const params = [];
     let sql = 'INSERT INTO `' + tblName + '` (';