Spring Data JPA中@Query多个参数为空处理方式

三种方式解决

一、使用：name
@Query(value="SELECT c.byname as byname, c.cart as cart,c.phone as phone,c.surname as surname, c.id as id,c.update_time as updateTime,c.head_img as headImg,c.is_blacklist as isBlacklist,c.is_member as isMember,"
+ "c.open_id as openid,c.take_address as takeAddress, c.pay_money as payMoney, "
+ " SUM(culog.pay_money) AS countPayMoney FROM cuser c "
+ "LEFT JOIN cuser_money_log culog ON c.id = culog.cuser_id AND culog.is_pay = 1 "
+ "WHERE IF (:byname is not null, c.byname LIKE CONCAT('%',:byname,'%') , 1 = 1) and IF (:isMember is not null, c.is_member = :isMember , 1 = 1) and IF (:isBlacklist is not null, c.is_blacklist = :isBlacklist , 1 = 1) and "
+ "IF (:phone is not null, c.phone = :phone , 1 = 1)"
+ "GROUP BY c.id LIMIT :PageOne,:PageSize",nativeQuery=true)
List<Map<String, Object>> countByQuery(@Param("byname") String byname,@Param("isMember") Integer isMember,@Param("isBlacklist") Integer isBlacklist,@Param("phone") String phone,@Param("PageOne") Integer PageOne, @Param("PageSize")Integer PageSize);
转载自：https://www.cnblogs.com/laixin09/p/9776868.html

二、使用1,2,3方式

// service层
public Page<SysUserDTO> findByUsernameAndOrgName(String username, String orgName, Pageable pageable){
        String name = (username==null)?null:"%"+username+"%";
        String orgname = (orgName==null)?null:"%"+orgName+"%";
        return sysUserDAO.findByUsernameAndOrgName(name,orgname,pageable);

//jpa 多对多关系的表联合查询 DAO层 
@Query(value = "select s from SysUserDTO s left join s.sysOrgDTOSet o where (?1 is null or s.username like ?1) and (?2 is null or o.name like ?2)") 
Page<SysUserDTO> findByUsernameAndOrgName(String username, String orgName, Pageable pageable);  

三：一二结合 
@Query(value = "select * from xxx where if(?1 !='',x1=?1,1=1) and if(?2 !='',x2=?2,1=1)" 
     + " and if(?3 !='',x3=?3,1=1) ",nativeQuery = true) 
List<XXX> find(String X1,String X2,String X3); 
说明:xxx是数据库表名，x1、x2、x3为查询的字段名。
下面的大写的XXX是实体类的名，X1X2X3为查询的参数。
if(?1 !='',x1=?1,1=1) 代表传入的参数X1如果不为""（Spring类型空是""而不是null）将参数传入x1，如果为空时显示1=1 代表参数为真，对查询结果不产生作用。

转载自：https://blog.csdn.net/qq_36802726/article/details/81208853

案例

　　jpa提供了@Query注解，可以通过自定义原生的sql来查询

public interface AbcRepository extends JpaRepository<Abc, String>, JpaSpecificationExecutor<Abc> {
 @Query(value = "SELECT a.* FROM abc" +
         "INNER JOIN (SELECT script_name,MAX(date_created) 'date_created' FROM abc" +
         "GROUP BY script_name) b " +
         "ON a.script_name = b.script_name  " +
         "AND a.date_created = b.date_created " +
         "AND IF(ifnull(?1,'') != '',a.script_name LIKE CONCAT('%',?1,'%'),1=1) " +
         "AND IF(ifnull(?2,'') != '',a.script_status LIKE CONCAT('%',?2,'%'),1=1) " +
         "AND IF(ifnull(?3,'') != '',a.script_flag LIKE CONCAT('%',?3,'%'),1=1) " +
         "AND IF(ifnull(?4,'') != '',a.level_one=?4,1=1) order by ?#{#pageable}",
         countQuery = "SELECT a.* FROM job_script a " +
                 "INNER JOIN (SELECT script_name,MAX(date_created) 'date_created' FROM job_script " +
                 "GROUP BY script_name) b " +
                 "ON a.script_name = b.script_name  " +
                 "AND a.date_created = b.date_created " +
                 "AND IF(ifnull(?1,'') != '',a.script_name LIKE CONCAT('%',?1,'%'),1=1)" +
                 "AND IF(ifnull(?2,'') != '',a.script_status LIKE CONCAT('%',?2,'%'),1=1) " +
                 "AND IF(ifnull(?3,'') != '',a.script_flag LIKE CONCAT('%',?3,'%'),1=1) " +
                 "AND IF(ifnull(?4,'') != '',a.level_one=?4,1=1)",
         nativeQuery = true)
 Page<abc> findJobScriptsByConditons(String scriptName,
                                           String scriptStatus,
                                           String scriptFlag,
                                           String levelOne,
                                           Pageable pageable);
}