From d2c275e8dea92de04a9a6f4c96b8f72aed091eb7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leo=E3=80=81Xi?= <785160953@qq.com>
Date: Wed, 30 Jan 2019 21:53:14 +0800
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---
 src/main/java/xin/xihc/jba/db/DB_MySql_Opera.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/xin/xihc/jba/db/DB_MySql_Opera.java b/src/main/java/xin/xihc/jba/db/DB_MySql_Opera.java
index 8592b75..7f98cb1 100644
--- a/src/main/java/xin/xihc/jba/db/DB_MySql_Opera.java
+++ b/src/main/java/xin/xihc/jba/db/DB_MySql_Opera.java
@@ -219,7 +219,9 @@ public void updateTable(TableProperties tbl) {
         String oldPrimary = dbColumnList.stream().filter(x -> x.primary()).map(ColumnProperties::colName).sorted().collect(Collectors.joining(","));
         String newPrimary = tbl.getColumns().values().stream().filter(x -> x.primary()).map(ColumnProperties::colName).sorted().collect(Collectors.joining(","));
         if (!newPrimary.equals(oldPrimary)) {
-            sqls.add("DROP PRIMARY KEY");
+            if (CommonUtil.isNotNullEmpty(oldPrimary)) {
+                sqls.add("DROP PRIMARY KEY");
+            }
             if (CommonUtil.isNotNullEmpty(newPrimary)) {
                 sqls.add("ADD PRIMARY KEY (" + newPrimary + ")");
             }