WHERE IN (array of IDs)

Question

I have webservice which is passed an array of ints. I\'d like to do the select statement as follows but keep getting errors. Do I need to change the array to a string?

Answer 1

You can use this. Execute in SQLServer to create a function on your DB (Only once):

IF EXISTS(
    SELECT *
    FROM sysobjects
    WHERE name = 'FN_RETORNA_ID_FROM_VARCHAR_TO_TABLE_INT')
BEGIN
    DROP FUNCTION FN_RETORNA_ID_FROM_VARCHAR_TO_TABLE_INT
END
GO

CREATE FUNCTION [dbo].FN_RETORNA_ID_FROM_VARCHAR_TO_TABLE_INT (@IDList VARCHAR(8000))
RETURNS
    @IDListTable TABLE (ID INT)
AS
BEGIN

    DECLARE
        --@IDList VARCHAR(100),
        @LastCommaPosition INT,
        @NextCommaPosition INT,
        @EndOfStringPosition INT,
        @StartOfStringPosition INT,
        @LengthOfString INT,
        @IDString VARCHAR(100),
        @IDValue INT

    --SET @IDList = '11,12,113'

    SET @LastCommaPosition = 0
    SET @NextCommaPosition = -1

    IF LTRIM(RTRIM(@IDList)) <> ''
    BEGIN

        WHILE(@NextCommaPosition <> 0)
        BEGIN

            SET @NextCommaPosition = CHARINDEX(',',@IDList,@LastCommaPosition + 1)

            IF @NextCommaPosition = 0
                SET @EndOfStringPosition = LEN(@IDList)
            ELSE
                SET @EndOfStringPosition = @NextCommaPosition - 1

            SET @StartOfStringPosition  = @LastCommaPosition + 1
            SET @LengthOfString = (@EndOfStringPosition + 1) - @StartOfStringPosition

            SET @IDString =  SUBSTRING(@IDList,@StartOfStringPosition,@LengthOfString)                  

            IF @IDString <> ''
                INSERT @IDListTable VALUES(@IDString)

            SET @LastCommaPosition = @NextCommaPosition

        END --WHILE(@NextCommaPosition <> 0)

    END --IF LTRIM(RTRIM(@IDList)) <> ''

    RETURN

ErrorBlock:

    RETURN

END --FUNCTION

After create the function you have to call this on your code:

command.CommandText = @"SELECT id,
                        startDateTime, endDateTime From
                        tb_bookings WHERE buildingID IN
                        (SELECT ID FROM FN_RETORNA_ID_FROM_VARCHAR_TO_TABLE_INT(@buildingIDs))) AND startDateTime <=
                        @fromDate";

command.Parameters.Add(new SqlParameter(){
                           DbType = DbType.String,
                           ParameterName = "@buildingIDs",
                           Value = "1,2,3,4,5" //Enter the parameters here separated with commas
                       });

This function get the text inner commas on "array" and make an table with this values as int, called ID. When this function is on you DB you can use in any project.

---

Thanks to Microsoft MSDN.

Igo S Ventura

Microsoft MVA

Sistema Ari de Sá

igo1-2@hotmail.com

P.S.: I'm from Brazil. Apologize my english... XD