@mapper personal understanding

@Mapper role that can automatically generate a class that implements an interface to the mapper, so spring for bean mapper interface to manage, and can be omitted to write complex xml file

Here borrow a piece of code

/ UserDAO
 Import org.apache.ibatis.annotations.Mapper;
 Import org.apache.ibatis.annotations.Param;
 Import org.apache.ibatis.annotations.Select; 

Import ; entity.User 

/ ** 
 * After adding a comment @Mapper this interface will be generated at compile time corresponding implementation class 
 * 
 * Note that: this interface can not define a method with the same name, as it will generate the same of the above mentioned id 
 * that is not supported by this interface is overloaded 
 * / 
@Mapper 
public  interface the UserDAO { 

    @Select ( "SELECT * WHERE name from User name = # {}" )
     public the User Find (String name); 

    @Select ( "SELECT * WHERE from User name {name = # = # {} and pwd pwd } " )
     / **
      * For multiple parameters, it should be added @Param comment before each parameter, 
      * or else will not find the corresponding parameters and then error 
      * / 
    public the User the Login (@Param ( "name") String name, @Param ( "pwd" ) String pwd); 
}

View Code

However, been to their own test, used to write xml, xml file using @mapper will come in, but if xml and @select exist, will complain, can only use one