From 6981868610af861b43db79cff73fa797e18b1e2f Mon Sep 17 00:00:00 2001
From: qi_liang <qi_liang_gz@163.com>
Date: Tue, 16 Oct 2018 23:47:54 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E6=95=B0=E6=8D=AE=E5=BA=93?=
 =?UTF-8?q?=E8=A1=A8=E5=88=9D=E5=A7=8B=E5=8C=96bug?=
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---
 .../java/com/lq/code/util/sql/MysqlBuilder.java    | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/main/java/com/lq/code/util/sql/MysqlBuilder.java b/src/main/java/com/lq/code/util/sql/MysqlBuilder.java
index 73cf017..d012f8b 100644
--- a/src/main/java/com/lq/code/util/sql/MysqlBuilder.java
+++ b/src/main/java/com/lq/code/util/sql/MysqlBuilder.java
@@ -40,15 +40,17 @@ public class MysqlBuilder extends AbstractDbBuiler {
          }
 
         List<Table> tableList = JdbcUtils.getAllTable();
-         Iterator<Table> tableIterator = tableList.iterator();
-        while (tableIterator.hasNext()){
-            Table table = (Table) tableIterator.next();
+        //初始化的时候,tableList可能为null
+        if(tableList!=null) {
+            Iterator<Table> tableIterator = tableList.iterator();
+            while (tableIterator.hasNext()) {
+                Table table = (Table) tableIterator.next();
                 if (map.containsKey(table.getTableName())) {
                     Class clazz = map.get(table.getTableName());
                     Map<String, Object> clazzMap = new HashMap<>();
                     List<Field> fieldsList = BeanUtil.getAllField(clazz);
                     Iterator<Field> fieldsIterator = fieldsList.iterator();
-                    while (fieldsIterator.hasNext()){
+                    while (fieldsIterator.hasNext()) {
                         Field f = fieldsIterator.next();
                         clazzMap.put(SqlUtil.caseToHump(f.getName()), f);
                     }
@@ -64,7 +66,7 @@ public class MysqlBuilder extends AbstractDbBuiler {
 
                     }
                     columnIterator = columnList.iterator();
-                    while (columnIterator.hasNext()){
+                    while (columnIterator.hasNext()) {
                         Column column = columnIterator.next();
                         sql.append("ALTER TABLE " + table.getTableName() + " DROP COLUMN " + column.getColumnName() + ";");
                     }
@@ -86,8 +88,8 @@ public class MysqlBuilder extends AbstractDbBuiler {
                     }
                     map.remove(table.getTableName());
                 }
+            }
         }
-
         for (String key : map.keySet()) {
             sql.append(this.createTableStr(map.get(key)));
         }