说来惭愧，MySQL一直处于只会用，不怎么理解的阶段。甚至是一些较为深层次的管理，都不怎么熟悉，得加强啊！

近日，系统测试，使用MySQL数据库，需要在某个表上创建触发器，数据库是在本机安装。但是，无论如何都无法创建触发器，后台错误信息如下：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: TRIGGER command denied to user 'root'@'mortimer-PC' for table 't_user'
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.Util.getInstance(Util.java:386)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2627)
	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:841)
	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:681)
	at com.apusic.jdbc.adapter.StatementHandle.execute(Unknown Source)
	at com.apusic.esb.base.util.SQLUtil.createDBObjectIfNecessary(SQLUtil.java:263)
	at com.apusic.esb.base.util.SQLUtil.createDBObjectIfNecessary(SQLUtil.java:225)
	at com.apusic.esb.config.trigger.mysql.MySqlTriggerManager.createTriggersIfNecessary(MySqlTriggerManager.java:83)
	at com.apusic.esb.config.trigger.TriggerConfigManager.deploy(TriggerConfigManager.java:331)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.apusic.esb.base.communication.CommInvokeUtil.invoke(CommInvokeUtil.java:139)
	at com.apusic.esb.base.communication.CommInvokeUtil.invoke(CommInvokeUtil.java:43)
	at com.apusic.esb.base.communication.CommInvokeUtil.invoke(CommInvokeUtil.java:27)
	at com.apusic.esb.base.communication.socket.server.CommSocketServer$RequestProcessor.run(CommSocketServer.java:99)
	at com.apusic.util.ThreadPoolImpl$WorkerThread.run(Unknown Source)
2014-06-25 10:38:42 错误 [apusic.com.apusic.esb.config.trigger.TriggerConfigManager] 
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: TRIGGER command denied to user 'root'@'mortimer-PC' for table 't_user'
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.Util.getInstance(Util.java:386)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2627)
	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:841)
	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:681)
	at com.apusic.jdbc.adapter.StatementHandle.execute(Unknown Source)
	at com.apusic.esb.base.util.SQLUtil.createDBObjectIfNecessary(SQLUtil.java:263)
	at com.apusic.esb.base.util.SQLUtil.createDBObjectIfNecessary(SQLUtil.java:225)
	at com.apusic.esb.config.trigger.mysql.MySqlTriggerManager.createTriggersIfNecessary(MySqlTriggerManager.java:83)
	at com.apusic.esb.config.trigger.TriggerConfigManager.deploy(TriggerConfigManager.java:331)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.apusic.esb.base.communication.CommInvokeUtil.invoke(CommInvokeUtil.java:139)
	at com.apusic.esb.base.communication.CommInvokeUtil.invoke(CommInvokeUtil.java:43)
	at com.apusic.esb.base.communication.CommInvokeUtil.invoke(CommInvokeUtil.java:27)
	at com.apusic.esb.base.communication.socket.server.CommSocketServer$RequestProcessor.run(CommSocketServer.java:99)
	at com.apusic.util.ThreadPoolImpl$WorkerThread.run(Unknown Source)

分析错误信息：TRIGGER command denied to user 'root'@'mortimer-PC' for table 't_user'，看起来是不允许root用户在t_user表上执行TRIGGER命令，为啥不允许？

其次，分析错误信息本身，不允许执行神马命令，看起来貌似是权限问题，Navicat连接数据库，查看用户权限，发现用户“root@%”的“Trigger”一栏未选中！而此次连接的用户，看起来是“root@mortimer-PC”，因此，“root@localhost”的规则，貌似不会生效，估计是此原因，造成无法创建触发器。

调整“root@%”用户的权限，选中“Trigger”栏，重启MySQL服务，重新连接MySQL，创建触发器，OK！