给mysql用户权限分配

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### 设置只读账号
CREATE USER dbreader IDENTIFIED BY 'test';
grant select on *.* to dbreader@"%" identified by "test";
### 设置只读账号
GRANT SElECT ON crmnew.* TO 'test'@'127.0.0.1' IDENTIFIED BY "test";
#### 
grant select,insert,update,delete on jxdb.* to 'test'@'%' identified by '123456';