資料庫表級聯查詢

所謂的級聯查詢也就是通過乙個uid 將兩個表進行鏈結起來，你可以獲取另乙個表中的字段資料。

下面列乙個例子和並講解使用：

用的是mybatis框架。

<?xml version="1.0" encoding="utf-8" ?>

l.id as "id",
l.create_by as "createby",
l.create_date as "createdate",
l.update_by as "updateby",
l.update_date as "updatedate",
l.user_id as "userid",
l.credit_rule_id as "creditruleid",
l.type as "type",
l.credit as "credit",
l.experience as "experience",
l.credit_time as "credittime",
l.remarks as "remarks",
l.del_flag as "delflag",
u.system_id as "user.systemid",
u.name as "user.name",
u.phone as "user.phone",
r.code as "creditrule.code",
r.name as "creditrule.name" 
left join sys_user c on c.id = l.create_by
join sys_user u on u.id = l.user_id
join credit_rule r on r.id = l.credit_rule_id
select 
from credit_log l
where l.del_flag = # 
and l.user_id = #
and l.credit_rule_id = #
and l.type = #
and u.system_id = #
and u.phone like concat('%', #, '%')
order by l.credit_time desc

使用的時候用的是partner.user.systemid    xml中  u.system_id as "user.systemid"

傳送後台時用的是 systemid    查詢 語句中 ：

and u.system_id = #

說明:這個例子就是通過使用者表的id 和 這個合夥人表的 userid 進行鏈結，通過積分表裡面的userid 去查詢使用者表中的支付id

left join sys_user c on c.id = l.create_by

join sys_user u on u.id = l.user_id
join credit_rule r on r.id = l.credit_rule_id

l.tid as "tid",

l.id as "id",
l.create_by as "createby",
l.create_date as "createdate",
l.update_by as "updateby",
l.update_date as "updatedate",
l.user_id as "userid",
l.credit_rule_id as "creditruleid",
l.type as "type",
l.credit as "credit",
l.experience as "experience",
l.credit_time as "credittime",
l.remarks as "remarks",
l.del_flag as "delflag",
u.system_id as "user.systemid",
u.name as "user.name",
u.phone as "user.phone",
r.code as "creditrule.code",
r.name as "creditrule.name" 

select 

from credit_log l
where l.del_flag = # 
and l.user_id = #
and l.credit_rule_id = #
and l.type = #
and u.system_id = #
order by l.credit_time desc

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