Mapper.xml中的trim

 trim 属性
                prefix：前缀覆盖并增加其内容
                suffix：后缀覆盖并增加其内容
                prefixOverrides：前缀判断的条件
                suffixOverrides：后缀判断的条件

 
        UPDATE test 
        
         
         name = #{name},
         
         
         phone = #{phone},
         
         
         address = #{address},
         
         
        WHERE 
         id = #{id} 
 

输出sql
update test set name = #{name}, phone = #{phone}, address = #{address}   WHERE id = #{id}

  select * from user
  
   
         and user_id != #{userId}
         
   
         and phone = #{phone} and state!=‘X‘
         
           
  
 

输出sql 

  select * from user  WHERE user_id != #{userId}  and phone = #{phone} and state!=‘X‘