SQL: How to make table name in stored procedure dynamic

问题

I am pretty new to SQL Server and hope someone here can help me with this (I'm using QL Server 2008).

The following is a small procedure that works as intended.

Now I would like to use the same procedure to update multiple tables as all these tables have exactly the same column names and column formatting, the only difference is the 2nd part of the table name for which I added XXX below.

Can someone tell me how this could be made dynamic and also provide me some explanations on this ? I cannot provide much more here as I wasn't sure about how to approach this - other than probably declaring @sql nvarchar(max) and wrapping the whole query in SET @sql = N'...' before executing it.

My stored procedure:

    CREATE PROCEDURE [dbo].[Cal_UpdateTeam]
        @team nvarchar(100),
        @teamID int,
        @notes nvarchar(1000),
        @log nvarchar(100),
        @admin varchar(50)
    AS
    BEGIN
        SET NOCOUNT ON;

        BEGIN   

        IF NOT EXISTS 
        (
                SELECT  * 
                FROM    Cal_XXX
                WHERE   teamID = @teamID
        )
        INSERT INTO Cal_XXX
        (
                team,
                teamID,
                notes,
                log,
                admin
        )
        SELECT  @team,
                @teamID,
                @notes,
                @log,
                @admin
        ELSE
                UPDATE  Cal_XXX
                SET     team = @team,
                        teamID = @teamID,
                        notes = @notes,
                        log = @log,
                        admin = @admin
                WHERE   teamID = @teamID

        END
END

Many thanks for any tips and advise on this, Mike.

回答1:

you should wrap your sql query in an nvarchar and then execute that query as in the below example :

    declare @sql nvarchar(max)
    declare @TableName nvarchar(max)
    set @TableName = 'mytable'
    set @sql = 'Select * from ' + @TableName
    Exec sp_executesql @sql

回答2:

in SP you can use Temporary Tables fro example:

CREATE PROCEDURE SELECT_TABLE
    @REQUEST_ID INT
AS
BEGIN

/*************************************
** Temporary table                  **
*************************************/
    CREATE TABLE #SOURCE (
        ID        INT
      , ID_PARENT INT
      , NAME      VARCHAR(200)
      , SORT      INT
      ..
      ..
    )

IF @REQUEST_ID = 'YES' BEGIN
    INSERT INTO #SOURCE SELECT * FROM SOURCE_A
END
ELSE BEGIN
    INSERT INTO #SOURCE SELECT * FROM SOURCE_B
END

SELECT * FROM #SOURCE
.....


END

GO

in SP you can encapsulate other SPs with different table names like parameter:

CREATE PROCEDURE SELECT_FROM_TABLE_A
AS
BEGIN
    SELECT * FROM SOURCE_A
END
GO
CREATE PROCEDURE SELECT_FROM_TABLE_B
AS
BEGIN
    SELECT * FROM SOURCE_B
END
GO

CREATE PROCEDURE SELECT_TABLE
    @REQUEST_ID INT

AS
BEGIN

/**********************************************
** Subrequest select                         **
**********************************************/

    IF @REQUEST_ID = 'YES' BEGIN
        -- Request SP fro Source A
        EXEC SELECT_FROM_TABLE_A
    END
    ELSE
    BEGIN
        -- Request SP fro Source B
        EXEC SELECT_FROM_TABLE_B
    END
END
GO

来源：https://stackoverflow.com/questions/25340658/sql-how-to-make-table-name-in-stored-procedure-dynamic

标签

sql

sql-server

stored-procedures

dynamic