.

src/main/java/net/tccn/base/MetaKit.java

@@ -477,12 +477,20 @@ public class MetaKit {
         return plat.get().getKey();
     }
 
-    public String nextAlias(String x) {
-        return next(x, "");
+    public static String lastAlias;
+    public static String nextAlias() {
+        if (lastAlias == null) {
+            lastAlias = MetaTable.dao.findFirst(
+                            "for d in MetaTable\n" +
+                            "sort length(d.alias) desc, d.alias desc\n" +
+                            "limit 1\n" +
+                            "return d.alias", String.class);
+        }
+        return lastAlias = next(lastAlias, "");
     }
 
     //使用['a',...,'z'] 创建Table 别名
-    private String next(String x, String end) {
+    private static String next(String x, String end) {
         if (x == null || "".equals(x)) {
             return "a" + end;
         }