复合键，比较

Question

我在 table.

上形成了一个唯一的复合键的三个字段

我想传入 3 个不同的数组，其中索引匹配。

custIds= [0,1,2]
custLetters = [A,B,C]
products = ["Cheese","lemons","Aubergine"]

是否有一个 sql 语句将 return 所有三行（假设它们存在），由于 "false positives" :

，仅通过 in 组合将不起作用

select * from mytable 
where custId in (custIds)
 and custLetters in (custLetters)
and product in (products);

数据库 oracle，但通过 hibernate hql，所以如果可能的话首选 ansi ?

Answer 1

你可以将你的数组组合成一个数组，然后：

custIds= [0,1,2]
custLetters = [A,B,C]
products = ["Cheese","lemons","Aubergine"]

Key=["0ACheese","1Blemons","2CAubergine"]

select * from mytable 
where custId+custLetters+product in (Key);

Answer 2

OT：您的 SQL 查询可能有误。应该是：

select * from mytable 
where (custId, custLetters, product) 
in ( (0, 'A', 'Cheese'),
 (1, 'B', 'lemons'),
 (2, 'C', 'Aubergine'));

我不知道Hibernate 是否可以生成这样的查询。但是 in 只是连词和析取的语法糖。

复合键，比较

Composite key, in comparison

java

sql

oracle

hql