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包含語句：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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