Solved

Stored Procedure updating columns Dynamically

Posted on 2012-04-02
2
286 Views
Last Modified: 2012-08-14
I have a stored procedure that I want to have save a value to a column based on the input I throw at it. I'm checking for existing column and datatype.

@Registration_ID NUMERIC
,@ColumnName VARCHAR(255)
,@ColumnValue VARCHAR(255)
,@ColumnDataType VARCHAR(255) OUTPUT
      

      SELECT @ColumnDataType = [Data_Type]
      FROM INFORMATION_SCHEMA.COLUMNS
      WHERE TABLE_NAME='Checklist'
      AND COLUMN_NAME=@ColumnName
      IF @ColumnDataType <> ''

----- @ColumnDataType here is set to a value of 'bit'

                        UPDATE [dbo].[Checklist]
                        SET @ColumnName =@ColumnValue
                              ,[Modified_Timestamp] = CURRENT_TIMESTAMP
                              ,[Modified_Action] = 'Update'
                        WHERE [Registration_ID] = @Registration_ID

       END


However when I run the SP, it does not update the column to the value I supply.

I tried using CAST with a dynamic SQL but it ended up in misery, so I'm avoiding that route unless I have to.
The SQL I used was:

SET @ColumnName = CAST(@ColumnValue AS @ColumnDataType)

Any suggestions as to what I'm doing wrong?
0
Comment
Question by:Rodrigo Munera
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 7

Accepted Solution

by:
micropc1 earned 500 total points
ID: 37799136
Since @ColumnName is not a field name you need to execute the dynamic update statement in either the EXEC command or the sp_executesql stored procedure.

Like...

EXEC('UPDATE [dbo].[Checklist] SET ' + @ColumnName + '=' + @ColumnValue + '
	,[Modified_Timestamp] = CURRENT_TIMESTAMP
	,[Modified_Action] = ''Update'' 
	WHERE [Registration_ID] = ' + @Registration_ID)

Open in new window


http://www.mssqltips.com/sqlservertip/1160/execute-dynamic-sql-commands-in-sql-server/
0
 
LVL 4

Author Closing Comment

by:Rodrigo Munera
ID: 37800834
Thank YOU!
I had started going in this direction but was thinking about the string wrong.
Your example cleared up for me a lot and helped me get to a working solution!

Ended up using SP_EXECUTESQL, that way I could declare the variables I was passing and was able to type them correctly :) thankyouthankyouthankyou!!!

This is what the final code ended up looking like:


SET @SQLString=N'UPDATE [dbo].[Checklist]
                              SET '+@ColumnName+' = @ColValue
                                    ,[Modified_Operator] = @Oper
                                    ,[Modified_Timestamp] = CURRENT_TIMESTAMP
                                    ,[Modified_Action] = ''Update''
                              WHERE [Registration_ID] = @Reg_ID';
SET @Params=N'@ColValue '+@ColumnDataType+'
                         ,@Oper VARCHAR(10)
                         ,@Reg_ID NUMERIC';

EXECUTE SP_EXECUTESQL      @SQLString
                                       ,@Params
                                       ,@ColValue=@ColumnValue
                                       ,@Oper=@Operator
                                       ,@Reg_ID=@Registration_ID;
0

Featured Post

Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Show RTF format in an SSRS report 3 40
sql update 2 37
UPDATE JOIN multiple tables 5 20
SQL Query Across Multiple Tables - Help 5 20
Nowadays, some of developer are too much worried about data. Who is using data, who is updating it etc. etc. Because, data is more costlier in term of money and information. So security of data is focusing concern in days. Lets' understand the Au…
Let's review the features of new SQL Server 2012 (Denali CTP3). It listed as below: PERCENT_RANK(): PERCENT_RANK() function will returns the percentage value of rank of the values among its group. PERCENT_RANK() function value always in be…
Via a live example, show how to extract insert data into a SQL Server database table using the Import/Export option and Bulk Insert.
Viewers will learn how to use the SELECT statement in SQL to return specific rows and columns, with various degrees of sorting and limits in place.

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question