Question

我收到以下声明：

SELECT XYZ FROM ABC WHERE ID IN (123)

目前我将123作为配置参数放在一个单独的表中：

SELECT XYZ FROM ABC WHERE ID IN (SELECT CONTENT FROM c_configuration WHERE IDENTIFIER = "ID")

现在c_configuration参数的内容已更改为“123,456”。有没有更好的方法然后将字段内容拆分为“，”并将它们插入数组并将数组放入WHERE ID IN ( ARRAY )部分？

提前谢谢你马特

Answer 1

尝试以下代码：

SELECT XYZ 
FROM ABC 
WHERE ID IN 
(
  SELECT DISTINCT TO_NUMBER(REGEXP_SUBSTR(CONTENT,'[^,]+', 1, level))
  FROM c_configuration
  WHERE IDENTIFIER = 'ID'
  CONNECT BY REGEXP_SUBSTR(CONTENT, '[^,]+', 1, level) IS NOT NULL
)

SQLFiddle Demo

Answer 2

您必须拆分csv值或使用动态sql。

Answer 3

你可以创建一个这样的函数：

create function dbo.fn_SplitString 
(
    @str nvarchar(max), 
    @separator char(1)
)
returns table
AS
return (
with tokens(p, a, b) AS (
    select 
        cast(1 as bigint), 
        cast(1 as bigint), 
        charindex(@separator, @str)
    union all
    select
        p + 1, 
        b + 1, 
        charindex(@separator, @str, b + 1)
    from tokens
    where b > 0
)
select
    substring(
        @str, 
        a, 
        case when b > 0 then b-a ELSE LEN(@str) end) 
    AS id
from tokens
);

此函数返回一个“数组/集”，您可以在“where in”语句中使用

select * 
from myTable 
where ID in (
    select id 
    from fn_fn_SplitString(select CONTENT from c_configuration where IDENTIFIER = "ID",','))

在哪里有列内容

3 个答案: