mybatis动态查询，模糊查询

mybatis动态查询，模糊查询

第一种：直接动态sql注解的形式

@Select("<script>"
        +"select * from problem where pro_res=0 and pro_state=#{state}  "
        +"      <if test='name != null' >   "
        +"     and app_id in (select app_id from application where app_name like '%${name}%' )"
        +"      </if>"
        +"      <if test='title != null' >   "
        +"            and pro_title like '%${title}%' "
        +"      </if>"
        +"      <if test='level != null' >"
        +"            and pro_level=#{level} "
        +"      </if>"
        +"      <if test='industry != null' >"
        +"            and pro_industry like '%${industry}%' "
        +"      </if>"
        +"      <if test='company != null' >"
        +"            and pro_company like '%${company}%' "
        +"      </if>"
        +"      <if test='keyword != null' >"
        +"            and pro_keyword like '%${keyword}%' "
        +"      </if>"
        +"</script>")
@ResultMap("problemMap")
List<Problem> searchByConditions(String name, @Param("title") String title, String level, String industry, String company, String keyword,@Param("state") String state);

第二种，基于Example的，适合于单个表的条件查询，模糊查询

@Override
public List<Subject> searchByConditions(String name, String degree, String title, String field, String institute) {
    SubjectExample subjectExample=new SubjectExample();
    SubjectExample.Criteria or = subjectExample.or();
    if (StringUtils.isNotBlank(name)){
        or.andSubNameLike("%"+name+"%");
    }
    if (StringUtils.isNotBlank(degree)){
        or.andSubEducationLike(degree);
    }
    if (StringUtils.isNotBlank(title)){
        or.andSubHeadLike("%"+title+"%");
    }
    if (StringUtils.isNotBlank(field)){
        or.andSubFieldLike("%"+field+"%");
    }
    if (StringUtils.isNotBlank(institute)){
        or.andSubWorkplaceLike("%"+institute+"%");
    }
    return subjectMapper.selectByExample(subjectExample);
}