I used SQL Server 2005 for my small web application. I Want pass parameters to SP . But there is one condition. number of parameter that can be change time to time. Think ,this time i pass name and Address , next time i pass name,surname,address ,
我使用SQL Server 2005作为我的小型Web应用程序。我想将参数传递给SP。但有一个条件。可以随时更改的参数数量。想想,这次我通过姓名和地址,下次我通过姓名,地址,
this parameter range may be 1-30 ,
此参数范围可能是1-30,
4 个解决方案
#1
12
You declare the procedure with default parameters and you invoke it with named parameters instead of positional parameters:
使用默认参数声明过程,并使用命名参数而不是位置参数调用它:
CREATE PROCEDURE usp_myProcedure
@name varchar(100) = '',
@surname varchar(100) = '',
@address varchar(100) = ''
AS
BEGIN
...
END
to invoke it from T-SQL:
从T-SQL调用它:
exec usp_myProcedure @name='John', @surname = 'Doe';
exec usp_myProcedure @name='Jane', @address = '123 Anystreet';
To invoke it from C#:
要从C#调用它:
SqlCommand cmd = new SqlCommand('usp_MyProcedure', ...);
cmd.CommandType = commandtype.StoredProcedure;
cmd.Parameters.AddWithValue('@name', 'John');
cmd.Parameters.AddWithValue('@surname', 'Doe');
#2
10
You can use XML types. Here is a sample procedure:
您可以使用XML类型。这是一个示例程序:
CREATE PROCEDURE udsp_VariableParams(@params XML) AS BEGIN DECLARE @vdoc INT EXEC sp_xml_preparedocument @vdoc OUTPUT, @params SELECT * FROM OPENXML(@vdoc, '/params/param', 1) WITH ([paramname] VARCHAR(40), [paramvalue] VARCHAR(150)) EXEC sp_xml_removedocument @vdoc END EXEC udsp_VariableParams '<params> <param paramname="name" paramvalue="value"/> <param paramname="address" paramvalue="value"/> </params>' EXEC udsp_VariableParams '<params> <param paramname="name" paramvalue="value"/> <param paramname="surname" paramvalue="value"/> <param paramname="address" paramvalue="value"/> </params>'
#3
6
You can set the default values for the parameters at the SP level so that the parameters become optional.
您可以在SP级别设置参数的默认值,以使参数成为可选参数。
e.g.
例如
CREATE PROCEDURE dbo.Test
@param1 int, -- Not an optional
@param2 int = 10, --Optional
@param3 bit = 0, --Optional
@param4 varchar(50) = '', --Optional
@param5 nvarchar(100) = null --Optional
-- more parameters .....
AS
BEGIN
-- The SQL goes here...
END
Then you can populate the optional parameters at your choice.
然后,您可以根据自己的选择填充可选参数。
#4
1
Preparing and exctracting tags from XML is aperformance killer. The inconsistant execution timings depends on whether plan is cached or not.
从XML准备和提取标签是一种性能杀手。不一致的执行时间取决于计划是否被缓存。
Using NVARCHAR(MAX) instead is a better option. Just prepare you parameter strings with "@name=Value" pair, and add a unique parameter sepearetor if needed. Inside the procedure use SUBSTRING, CHARINDEX, etc. to get individual parameters.
相反,使用NVARCHAR(MAX)是一个更好的选择。只需使用“@ name = Value”对准备参数字符串,并根据需要添加唯一参数sepearetor。在程序内部使用SUBSTRING,CHARINDEX等来获取单个参数。
#1
12
You declare the procedure with default parameters and you invoke it with named parameters instead of positional parameters:
使用默认参数声明过程,并使用命名参数而不是位置参数调用它:
CREATE PROCEDURE usp_myProcedure
@name varchar(100) = '',
@surname varchar(100) = '',
@address varchar(100) = ''
AS
BEGIN
...
END
to invoke it from T-SQL:
从T-SQL调用它:
exec usp_myProcedure @name='John', @surname = 'Doe';
exec usp_myProcedure @name='Jane', @address = '123 Anystreet';
To invoke it from C#:
要从C#调用它:
SqlCommand cmd = new SqlCommand('usp_MyProcedure', ...);
cmd.CommandType = commandtype.StoredProcedure;
cmd.Parameters.AddWithValue('@name', 'John');
cmd.Parameters.AddWithValue('@surname', 'Doe');
#2
10
You can use XML types. Here is a sample procedure:
您可以使用XML类型。这是一个示例程序:
CREATE PROCEDURE udsp_VariableParams(@params XML) AS BEGIN DECLARE @vdoc INT EXEC sp_xml_preparedocument @vdoc OUTPUT, @params SELECT * FROM OPENXML(@vdoc, '/params/param', 1) WITH ([paramname] VARCHAR(40), [paramvalue] VARCHAR(150)) EXEC sp_xml_removedocument @vdoc END EXEC udsp_VariableParams '<params> <param paramname="name" paramvalue="value"/> <param paramname="address" paramvalue="value"/> </params>' EXEC udsp_VariableParams '<params> <param paramname="name" paramvalue="value"/> <param paramname="surname" paramvalue="value"/> <param paramname="address" paramvalue="value"/> </params>'
#3
6
You can set the default values for the parameters at the SP level so that the parameters become optional.
您可以在SP级别设置参数的默认值,以使参数成为可选参数。
e.g.
例如
CREATE PROCEDURE dbo.Test
@param1 int, -- Not an optional
@param2 int = 10, --Optional
@param3 bit = 0, --Optional
@param4 varchar(50) = '', --Optional
@param5 nvarchar(100) = null --Optional
-- more parameters .....
AS
BEGIN
-- The SQL goes here...
END
Then you can populate the optional parameters at your choice.
然后,您可以根据自己的选择填充可选参数。
#4
1
Preparing and exctracting tags from XML is aperformance killer. The inconsistant execution timings depends on whether plan is cached or not.
从XML准备和提取标签是一种性能杀手。不一致的执行时间取决于计划是否被缓存。
Using NVARCHAR(MAX) instead is a better option. Just prepare you parameter strings with "@name=Value" pair, and add a unique parameter sepearetor if needed. Inside the procedure use SUBSTRING, CHARINDEX, etc. to get individual parameters.
相反,使用NVARCHAR(MAX)是一个更好的选择。只需使用“@ name = Value”对准备参数字符串,并根据需要添加唯一参数sepearetor。在程序内部使用SUBSTRING,CHARINDEX等来获取单个参数。