两个表联合时，hql动态拼接，需要后置查询条件的解决办法

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两表联合后，需要添加多个查询条件的解决方案

一、 这是我第一次在项目组做融资租赁时遇到的问题，代码如下：

public ComposedBean OverdueReminder(Map param) throws CommonException{
ComposedBean composedBean = new ComposedBean();
StringBuffer sql = new StringBuffer();
sql.append(" select * from (")
//0申请编号， 1 申请人类型
.append(" select m.asqbh,m.asqlx, ")
//通过对申请人类型的判断设置客户姓名
.append(" case m.asqlx when ‘1‘ then i.akhxm when ‘2‘ then i.aQymc2 else ‘‘ end as akhxm, ")
//4操作人员， 5客户电话， 6车辆类型， 7产品方案， 8提交日期
.append(" m.aczry,i.asjhm,n.acllx,m.acpfamc,m.dsctjrq ")
.append(" from lb_apply_car n ")
.append(" left join lb_apply_lessee_info i on i.asqbh = n.asqbh ")
.append(" left join lb_apply_main m on m.asqbh = n.asqbh ")
.append(" where n.acllx = ‘1‘ and m.dfkrq is not null ")
.append(" and not exists (select 1 from tinfo_insurance_policy p where n.asqbh = p.asqbh) ")
.append(" union ")//联合下表
.append(" select m.asqbh,m.asqlx, ")
.append(" case m.asqlx when ‘1‘ then i.akhxm when ‘2‘ then i.aQymc2 else ‘‘ end as akhxm, ")
.append(" m.aczry,i.asjhm,n.acllx,m.acpfamc,m.dsctjrq from lb_apply_car_invoice t ")
.append(" left join lb_apply_main m on m.asqbh = t.asqbh ")
.append(" left join lb_apply_car n on n.asqbh = t.asqbh ")
.append(" left join lb_apply_lessee_info i on m.asqbh =i.asqbh ")
.append(" where t.aclfph is null and m.dfkrq is not null and n.acllx = ‘1‘ ) where 1=1");
//申请编号
if(StringUtils.isNotBlank((String)param.get("asqbh"))){
sql.append(" and asqbh =‘"+param.get("asqbh")+"‘");
}
//客户姓名
if(StringUtils.isNotBlank((String)param.get("akhxm"))){
sql.append(" and akhxm like ‘%"+param.get("akhxm")+"%‘");
}

composedBean.setSql(sql.toString());
return composedBean;
}

sql 代码如下：

SELECT
*
FROM
(
SELECT
m.asqbh,
m.asqlx,
CASE m.asqlx
WHEN ‘1‘
THEN i.akhxm
WHEN ‘2‘
THEN i.aQymc2
ELSE ‘‘
END AS akhxm,
m.aczry,
i.asjhm,
n.acllx,
m.acpfamc,
m.dsctjrq
FROM
lb_apply_car n
LEFT JOIN
lb_apply_lessee_info i
ON
i.asqbh = n.asqbh
LEFT JOIN
lb_apply_main m
ON
m.asqbh = n.asqbh
WHERE
n.acllx = ‘1‘
AND m.dfkrq IS NOT NULL
AND NOT EXISTS
(
SELECT
1
FROM
tinfo_insurance_policy p
WHERE
n.asqbh = p.asqbh)
UNION
SELECT
m.asqbh,
m.asqlx,
CASE m.asqlx
WHEN ‘1‘
THEN i.akhxm
WHEN ‘2‘
THEN i.aQymc2
ELSE ‘‘
END AS akhxm,
m.aczry,
i.asjhm,
n.acllx,
m.acpfamc,
m.dsctjrq
FROM
lb_apply_car_invoice t
LEFT JOIN
lb_apply_main m
ON
m.asqbh = t.asqbh
LEFT JOIN
lb_apply_car n
ON
n.asqbh = t.asqbh
LEFT JOIN
lb_apply_lessee_info i
ON
m.asqbh =i.asqbh
WHERE
t.aclfph IS NULL
AND m.dfkrq IS NOT NULL
AND n.acllx = ‘1‘ )
WHERE
1=1
AND asqbh =‘0007576‘
AND akhxm LIKE ‘%钱林泉%‘

添加查询条件就是添加where，我们可以在主体sql中通过写代码 where 1=1，来为后面的sql 拼接提供where ，后面的代码就可以直接书写and。。。。 了

两个表联合时，hql动态拼接，需要后置查询条件的解决办法

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原文地址：http://www.cnblogs.com/xiaojianjian/p/5602655.html