存储过程不会返回正确的值

Question

我有存储过程：

ALTER PROCEDURE ReplaceHtmlEntities
    @companyName  NVARCHAR(200)
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @newCompanyName NVARCHAR(200);

    SET @newCompanyName = @companyName;
    SET @newCompanyName = REPLACE(@newCompanyName,'&','&');
    SET @newCompanyName = REPLACE(@newCompanyName,'"','"');
    SET @newCompanyName = REPLACE(@newCompanyName,''','''');
    SELECT @newCompanyName;
END
GO

但它返回0：

DECLARE @companyName nvarchar(200), @result nvarchar(200)

SET @companyName = N'Company name &'

EXEC    @result = [dbo].[ReplaceHtmlEntities] @companyName

SELECT  @result

@result应该是＆＃39;公司名称＆amp;＆＃39;但它给了我＆＃39; 0＆＃39; 0 - 为什么？

Answer 1

存储过程只能返回整数（ref）。

您可以从输出参数返回它，但我认为您应该创建一个函数：

CREATE FUNCTION ReplaceHtmlEntities
    (@companyName  NVARCHAR(200))
RETURNS NVARCHAR(200)
AS
BEGIN
    DECLARE @newCompanyName NVARCHAR(200);

    SET @newCompanyName = @companyName;
    SET @newCompanyName = REPLACE(@newCompanyName,'&','&');
    SET @newCompanyName = REPLACE(@newCompanyName,'"','"');
    SET @newCompanyName = REPLACE(@newCompanyName,''','''');

    RETURN @newCompanyName;
END
GO

这就是你如何执行一个功能：

DECLARE @companyName nvarchar(200), @result nvarchar(200)
SET @companyName = N'Company name &'

SET @result = [dbo].[ReplaceHtmlEntities](@companyName)

SELECT  @result

Answer 2

在您调用它的地方，删除@result =和行select @result。

选择内部 SP将为您生成数据。

DECLARE @companyName nvarchar(200), @result nvarchar(200)
SET @companyName = N'Company name &'
EXEC [dbo].[ReplaceHtmlEntities] @companyName

但如果你把它变成了UDF，那就更好了，

 Create Function dbo.ReplaceHtmlEntities(@input varChar(1000) )
 returns table As
 Return (Select Replace(Replace(REPLACE(
                @input,'&','&'), 
                       '"','"'),
                       ''','''') OutVal)

然后你需要做的就是

Select OutVal from dbo.ReplaceHtmlEntities('Put the companyname here') 

Answer 3

SQL Server中的存储过程只能返回整数。存储过程结束时的SELECT将创建一个结果集而不是返回值。

要从存储过程输出值作为输出参数，请声明如下过程：

ALTER PROCEDURE ReplaceHtmlEntities
    @companyName  NVARCHAR(200),
    @newCompanyName NVARCHAR(200) OUTPUT
AS
BEGIN
    SET NOCOUNT ON;

    SET @newCompanyName = @companyName;
    SET @newCompanyName = REPLACE(@newCompanyName,'&','&');
    SET @newCompanyName = REPLACE(@newCompanyName,'"','"');
    SET @newCompanyName = REPLACE(@newCompanyName,''','''');
END
GO

DECLARE @companyName nvarchar(200) = 'A & B'

EXEC ReplaceHtmlEntities @companyName = @companyName, @newCompanyName = @companyName OUTPUT

SELECT  @companyName

GO