标签：
最近项目向MySql迁移，迁移完毕后，在获取用户权限时产生了一个异常，跟踪进去获取执行的语句如下，
SELECT PermissionId FROM spysxtPermission WHERE (ResourceCategory = ‘BaseUser‘ AND ResourceId = ‘003bf4bd072243fa90517ee2bc088cb7‘ AND Enabled = 1 AND DeletionStateCode = 0) UNION SELECT PermissionId FROM spysxtPermission , ( SELECT RoleId FROM spysxtUserRole WHERE (UserId = ‘003bf4bd072243fa90517ee2bc088cb7‘ AND Enabled = 1 AND DeletionStateCode = 0 ) UNION SELECT RoleId FROM BaseUserRole WHERE ( UserId = ‘003bf4bd072243fa90517ee2bc088cb7‘ AND Enabled = 1 AND DeletionStateCode = 0 ) ) B WHERE ResourceCategory = ‘spysxtRole‘ AND spysxtPermission.ResourceId = B.RoleId AND spysxtPermission.Enabled = 1 AND spysxtPermission.DeletionStateCode = 0
在Navicate执行，提示如下：
这个语句在Oracle中执行都是正常的，一时不知道是什么原因，baidu了也没找到如何处理，我将语句逐个拆开执行，最终找到问题出在这里：
SELECT RoleId FROM spysxtUserRole WHERE (UserId = ‘003bf4bd072243fa90517ee2bc088cb7‘ AND Enabled = 1 AND DeletionStateCode = 0 )
UNION SELECT RoleId FROM BaseUserRole WHERE ( UserId = ‘003bf4bd072243fa90517ee2bc088cb7‘ AND Enabled = 1 AND DeletionStateCode = 0 )
看到这里，我突然想到有可能是字符集不一样造成的，打开表
原来问题出在排序规则上，一个是utf8_unicode_ci，一个是utf8_danish_ci。全部改为utf8_unicode_ci。问题解决!
原以为是代码bug，一直在调试代码，没想到问题出在这里。
标签：
原文地址：http://www.cnblogs.com/hnsongbiao/p/5400423.html
