java.sql.SQLException: Unknown error 1449（视图报错引出权限问题）

场景：将远程测试数据库中的数据导入到本地数据库，启动项目后一部分功能能正常使用，一部分页面数据无法正常显示，后端报错如下：（项目中使用到了视图，数据同步后，连接远程没有问题，连接本地数据库视图部分就会报错）

Caused by: com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: Error: Method queryTotal execution error of sql : 
 SELECT COUNT(1) FROM view_results 

	at com.baomidou.mybatisplus.core.toolkit.ExceptionUtils.mpe(ExceptionUtils.java:41)
	at com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor.queryTotal(PaginationInterceptor.java:223)
	at com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor.intercept(PaginationInterceptor.java:170)
	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
	at com.sun.proxy.$Proxy116.prepare(Unknown Source)
	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:85)
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:136)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
	... 104 common frames omitted
Caused by: java.sql.SQLException: Unknown error 1449
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
	at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1962)
	at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeQuery(FilterChainImpl.java:3188)
	at com.alibaba.druid.wall.WallFilter.preparedStatement_executeQuery(WallFilter.java:641)
	at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeQuery(FilterChainImpl.java:3185)
	at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_executeQuery(FilterEventAdapter.java:465)
	at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeQuery(FilterChainImpl.java:3185)
	at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.executeQuery(PreparedStatementProxyImpl.java:181)
	at com.alibaba.druid.pool.DruidPooledPreparedStatement.executeQuery(DruidPooledPreparedStatement.java:228)
	at sun.reflect.GeneratedMethodAccessor210.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:56)
	at com.sun.proxy.$Proxy118.executeQuery(Unknown Source)
	at com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor.queryTotal(PaginationInterceptor.java:208)
	... 113 common frames omitted

说明：view_results 是使用的视图，导入到本地后，创建视图DEFINER的用户也已经改为本地库的用户root。基本确定是视图的问题，检查了N遍没发现视图定义有问题，报错简直一脸懵。不过还好最后有一个SQL的报错：java.sql.SQLException: Unknown error 1449。百度一波发现是权限的问题。。。安装的时候难道没给root用户赋予全部权限？好吧，再赋权一次呗。

解决：

给root用户赋予全部权限：

mysql> grant all privileges on . to root@”%” identified by “.”; 

Query OK, 0 rows affected (0.00 sec)

至此，完美解决问题。项目中用到视图，基本上算是我第一次接触到视图，其实挺简单的，自我理解就是将查询语句（一般为多表联查）放到视图中生成虚拟表，调用视图即可获取数据。