Mybatis dynamic SQL annotations in operator usage

 

Use the following as direct as possible if we want to use in the case in SQL syntax:

update user set status='1' where id in (1,2,3) ;

select * from user where id in (1,2,3) ;

 

But if you use the MyBatis is in the operator, write it like this certainly will complain:

@Update("update user set status=#{status} where id in #{userIds}") 
public void updateUserStatus(@Param("userIds") String userIds, @Param("status") int status); 

Wherein userIds = ( . 1 , 2 , . 3 )

Such direct splicing of writing, it seems very simple, in findByCondition with no problem, but in a dynamic SQL MyBatis annotations are not supported.

 

God closes a door, it will certainly open a window.

For the above case, MyBatis provides foreach statement to achieve IN query.

foreach syntax is as follows: foreach statement, the parameter type collection property can support: List, array, map collection

collection: mapper.java must be followed in @Param label elements specified name as
item: representing each element of an alias in an iterative process, you can easily named, but it must be like in the name of the element inside of # {}.
　　index: represents each iteration in an iterative process to the position (subscript)
　　Open: prefix, sql statement must be set with parentheses () enclosed
close: suffix
　　separator: separator, showing the elements of each iteration between what separated

 

Example:

@Update({"<script>",
            "update user set status=#{status} where id in ",
            "<foreach collection=\"userIdList\" item=\"userId\" index=\"index\" open=\"(\" separator=\",\" close=\")\">",
                 "#{userId}",
            "</foreach>",
         "</script>"})
public void updateUserStatus(@Param("userIdList") List<String> userIdList, @Param("status") int status);

 

 

 

Common learning and common progress, if any supplement, please point out, thank you!