diff --git a/dsUtils/src/main/java/com/dsideal/GenerateCode.java b/dsUtils/src/main/java/com/dsideal/GenerateCode.java
index 6da278bf..f9f0255b 100644
--- a/dsUtils/src/main/java/com/dsideal/GenerateCode.java
+++ b/dsUtils/src/main/java/com/dsideal/GenerateCode.java
@@ -171,11 +171,11 @@ public class GenerateCode {
         //开始生成
         List<String> tables = getTableNames(conn);
 
-        String tableNames = "";
+        StringBuilder tableNames = new StringBuilder();
         //表描述
         for (String table : tables) {
             JSONObject jo = getStructure(conn, table);
-            tableNames += table + ",";
+            tableNames.append(table).append(",");
 
             if (StrKit.isBlank(jo.getStr("key"))) {
                 dsKit.print("表" + table + "没有主键，请检查！");
@@ -183,12 +183,12 @@ public class GenerateCode {
             //生成代码
             autoCodeFreeMaker(jo);
         }
-        if (StrKit.isBlank(tableNames)) {
+        if (StrKit.isBlank(tableNames.toString())) {
             dsKit.print("没有找到表，请检查！");
             return;
         }
         //去掉最后的逗号
-        tableNames = tableNames.substring(0, tableNames.length() - 1);
+        tableNames = new StringBuilder(tableNames.substring(0, tableNames.length() - 1));
 
         //关闭数据库
         conn.close();
@@ -261,18 +261,18 @@ public class GenerateCode {
         dataModel.put("tableName", tableName);//表名
 
         //更新时的填充参数
-        String updateParas = "";
+        StringBuilder updateParas = new StringBuilder();
         for (String s : parasWithoutPrimaryKeyAndDataType.split(",")) {
             if (s.equals("create_time")) {
-                updateParas += s + "=now(),";
+                updateParas.append(s).append("=now(),");
             } else {
-                updateParas += s + "=?,";
+                updateParas.append(s).append("=?,");
             }
         }
-        if (updateParas.endsWith(",")) {
-            updateParas = updateParas.substring(0, updateParas.length() - 1);
+        if (updateParas.toString().endsWith(",")) {
+            updateParas = new StringBuilder(updateParas.substring(0, updateParas.length() - 1));
         }
-        dataModel.put("updateParas", updateParas);
+        dataModel.put("updateParas", updateParas.toString());
 
         //打印调试信息
         //System.out.println(dataModel);