Question

我希望你能理解我的问题，如果没有，请告诉我......

在我的表单中，我有八个文本框，就像这样（用户在第一个文本框中写入“25”，在第二个文本框中写入“35”）：

Code1From: _25____   Code1To:_35____
Code2From: _______   Code2To:_______
Code3From: _______   Code3To:_______
Code4From: _______   Code4To:_______

我的表格如下：

create table MyTable (
    Id int identity(1,1),
    Code1From bigint, Code1To bigint,
    Code2From bigint, Code2To bigint,
    Code3From bigint, Code3To bigint,
    Code4From bigint, Code4To bigint
)

现在我想阻止插入已经插入的数据。例如： MyTable中的数据：

Id, Code1From, Code1To, Code2From, Code2To, Code3From, Code3To, Code4From, Code4To
1, 1, 10, null, null, null, null, null, null
2, 11, 20, null, null, null, null, null, null
3, 21, 30, null, null, null, null, null, null
4, 31, 40, null, null, null, null, null, null
5, 41, 50, null, null, null, null, null, null

如果用户想要从25到35插入Code1（或Code2，Code3或Code4），我应该引发错误（因为数据库中已经存在从25到35的范围 - 身份3和4）。但是，用户可以插入从51到55的范围。

如果我的数据库中已经存在跨度，我如何确定？现在我可以这样做：

select *
from MyTable
where
   @code1From between Code1From and Code1To
or @code1From between Code2From and Code2To
or @code1From between Code3From and Code3To
or @code1From between Code4From and Code4To
--
or @code1To between Code1From and Code1To
or @code1To between Code2From and Code2To
or @code1To between Code3From and Code3To
or @code1To between Code4From and Code4To
--
... and another 24 or statements

有没有更简单的方法来实现这个目标？

Answer 1

如果我理解正确，这可能会对你有所帮助

DECLARE @Table TABLE(
        FromVal1 FLOAT,
        ToVal1 FLOAT,
        FromVal2 FLOAT,
        ToVal2 FLOAT,
        FromVal3 FLOAT,
        ToVal3 FLOAT,
        FromVal4 FLOAT,
        ToVal4 FLOAT
)

INSERT INTO @Table (FromVal1,ToVal1,FromVal2,ToVal2) SELECT 1, 10, 51, 60
INSERT INTO @Table (FromVal2,ToVal2) SELECT 11, 20
INSERT INTO @Table (FromVal3,ToVal3) SELECT 21, 30
INSERT INTO @Table (FromVal4,ToVal4) SELECT 31, 40
INSERT INTO @Table (FromVal1,ToVal1) SELECT 41, 50

DECLARE @FromVal FLOAT,
        @ToVal FLOAT

SELECT  @FromVal = 25,
        @ToVal = 35

SELECT  *
FROM    @Table
WHERE   NOT(FromVal1 > @ToVal OR ToVal1 < @FromVal)
OR      NOT(FromVal2 > @ToVal OR ToVal2 < @FromVal)
OR      NOT(FromVal3 > @ToVal OR ToVal3 < @FromVal)
OR      NOT(FromVal4 > @ToVal OR ToVal4 < @FromVal)

数字跨度是否存在于数据库中

1 个答案: