MyBatis @Select注解介绍:基本用法与动态SQL拼写方式

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Select
{
    String[] value();
}

@Select({ "select * from xxx", "select * from yyy" })
Person selectPersonById(Integer id);

@Select("select * from t_person where id = #{id}")
Person selectPersonById(Integer id);

@Select("<script> select * from t_person where id = #{id} 
<when test='address !=null'> and address = #{address} 
</when> </script>")
Person selectPersonById(Integer id);

    @Select("<script>" +
            " select * from tb_crowd_fund_person_record a,tb_crowd_fund_info b where b.id=a.crowd_fund_info_id " +
            " <if test='activeStatus != null and activeStatus != \"\"'> "+
            "  and b.active_status=#{activeStatus} " +
            " </if> " +
            " <if test='createUser != null and createUser != \"\"'> "+
            "  and a.create_user=#{createUser} " +
            " </if> " +
            "</script>")
    List<String> findByType(Map<String,String> map);