SQL CHECK CONSTRAINT拒绝字母数字和特殊章程，只允许0到9之间的数字

Question

我有以下约束，应该只允许从0到9插入的数字，而不是任何特殊和字母字符。 但情况并非如此，例如使用此更新语句时：

   update MyDB.dbo.MyTable 
    set MyTestPhoneExt = '23&'  where ID = 1;

目标是确保源和写入MyTable的数据只有数字，但MyTestPhoneExt字段为VARCHAR（15）NULL。

ALTER TABLE MyDB.dbo.MyTable  WITH CHECK ADD CONSTRAINT [CHK_MyDB_MyTable _MyTestPhoneExt] 
CHECK ((MyTestPhoneExt IS NULL OR LEN(MyTestPhoneExt)>=(1) AND

LEN(MyTestPhoneExt)<=(15) AND MyTestPhoneExt LIKE '%[0-9]%' 

--OR len(MyTestPhoneExt)>=(1) AND len(MyTestPhoneExt)<=(15) 

AND NOT MyTestPhoneExt LIKE '%[a-zA-Z]%' 
AND NOT (MyTestPhoneExt=' ' OR MyTestPhoneExt='' OR MyTestPhoneExt='&' OR

MyTestPhoneExt='`' OR MyTestPhoneExt='~' OR MyTestPhoneExt='>' OR 

MyTestPhoneExt='<' OR MyTestPhoneExt='.' OR MyTestPhoneExt=',' OR 

MyTestPhoneExt=';' OR MyTestPhoneExt=':' OR MyTestPhoneExt='?' OR 

MyTestPhoneExt='_' OR MyTestPhoneExt='=' OR MyTestPhoneExt='+' OR

MyTestPhoneExt='!' OR MyTestPhoneExt='@' OR MyTestPhoneExt='#' OR

MyTestPhoneExt='%' OR MyTestPhoneExt='$' OR MyTestPhoneExt='^' OR

MyTestPhoneExt='*' OR MyTestPhoneExt=',' OR MyTestPhoneExt='}' OR

MyTestPhoneExt='{' OR MyTestPhoneExt=')' OR MyTestPhoneExt='(' OR 

MyTestPhoneExt=']' OR MyTestPhoneExt='[' OR MyTestPhoneExt='|' OR 

MyTestPhoneExt='\' OR MyTestPhoneExt='/' OR MyTestPhoneExt='-' OR MyTestPhoneExt='@')))

Answer 1

尝试在CHECK CONSTRAINT使用PATINDEX

CREATE TABLE Mytable
(
    MyCol NVARCHAR(50) CHECK(PATINDEX('%[^0-9]%',MyCol)=0 AND ISNUMERIC(MyCol) = 1)
)

INSERT INTO Mytable
(
    MyCol
)
VALUES(1),(2)

INSERT INTO Mytable
(
    MyCol
)
VALUES('1B'),('2A')

INSERT INTO Mytable
(
    MyCol
)
VALUES('1.0'),('2.5')


INSERT INTO Mytable
(
    MyCol
)
VALUES('1 '),('2 x')

SELECT
    *
    FROM Mytable

Answer 2

这不是一个更简单的接受数字的方法吗？

patindex('%[^0-9]%', MyTestPhoneExt) = 0

Answer 3

要仅允许数值，可以使用具有检查约束的TRY_CONVERT()函数

ALTER TABLE table    
ADD CONSTRAINT CHK_MyDB_MyTable _MyTestPhoneExt 
                         CHECK(TRY_CONVERT(BIGINT, MyTestPhoneExt) IS NOT NULL)

你也可以使用系统函数ISNUMERIC()

ALTER TABLE table    
ADD CONSTRAINT CHK_MyDB_MyTable _MyTestPhoneExt 
                             CHECK(ISNUMERIC(MyTestPhoneExt)=1)