sql-server - 将 LIKE 运算符与存储过程参数一起使用

Question

我有一个存储过程，它使用LIKE运算符在其他一些参数中搜索卡车位置

   @location nchar(20),
   @time time,
   @date date
AS
   select 
       DonationsTruck.VechileId, Phone, Location, [Date], [Time]
   from 
       Vechile, DonationsTruck
    where 
       Vechile.VechileId = DonationsTruck.VechileId
       and (((Location like '%'+@location+'%') or (Location like '%'+@location) or (Location like @location+'%') ) or [Date]=@date or [Time] = @time)

我将其他参数设为空并仅按位置搜索，但即使我使用位置的全名，它也始终不返回任何结果

Answer 1

您的数据类型@location nchar(20)应该是@location nvarchar(20)，因为 nChar 具有固定长度（用空格填充）。
如果 Location 也是 nchar 你将不得不转换它：

 ... Cast(Location as nVarchar(200)) like '%'+@location+'%' ...   

要使用和AND条件启用可空参数，只需使用 IsNull 或 Coalesce 进行比较，在使用OR.

例如，如果您想比较位置和日期和时间。

@location nchar(20),
@time time,
@date date
as
select DonationsTruck.VechileId, Phone, Location, [Date], [Time]
from Vechile, DonationsTruck
where Vechile.VechileId = DonationsTruck.VechileId
and (((Location like '%'+IsNull(@location,Location)+'%')) and [Date]=IsNUll(@date,date) and [Time] = IsNull(@time,Time))

Answer 2

我也在做同样的事情。检查以下声明。为我工作！！

---

SELECT * FROM [Schema].[Table] WHERE [Column] LIKE '%' + @Parameter + '%'

Answer 3

对于 mysql- SELECT * FROM tablename WHERE columnanme LIKE '%'+ @location+'%';

对于 oracle - SELECT * FROM tablename WHERE columnanme LIKE '%'|| @位置 ||'%';

Answer 4

...
WHERE ...
      AND (@Location is null OR (Location like '%' + @Location + '%'))
      AND (@Date is null OR (Date = @Date))

这样更明显的是参数在 null 时不使用。

Answer 5

CREATE PROCEDURE [dbo].[Sp_schemeallotment] (
    @SchemeName NVARCHAR (255) = ' ',
    @Ind INT = 0
)
AS
  BEGIN
      IF ( @Ind = 1 )
        BEGIN
            SELECT *
            FROM   schemeallotment
        END

      IF ( @Ind = 2 )
        BEGIN
            SELECT *
            FROM   schemeallotment
            WHERE  schemename LIKE '%' + @SchemeName + '%'
        END
  END

--exec sp_SchemeAllotment @Ind=2, @SchemeName='shree'
go 

像这样分配这些变量很重要：

(
    @SchemeName nvarchar (255) = ' ',
    @Ind int = 0
)

Answer 6

   CREATE procedure [dbo].[sp_SchemeAllotment]
    (
    @SchemeName nvarchar (255)='',
    @Ind int=0
    )
    As 
    Begin
    if (@Ind = 1)
    begin
    SELECT * FROM SchemeAllotment
    End
    if (@Ind = 2)
    begin
    SELECT * FROM SchemeAllotment where SchemeName like '%'+ @SchemeName +'%'
    end
    End
    --exec sp_SchemeAllotment @Ind=2, @SchemeName='shree'
    GO

Answer 7

EG : 与村名比较

ALTER PROCEDURE POSMAST
(@COLUMN_NAME VARCHAR(50))
AS
SELECT * FROM TABLE_NAME
WHERE 
village_name LIKE + @VILLAGE_NAME + '%';