Updating with Data Sets and Stored Procedures in .NET

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Not surprisingly, in order to talk about updates with stored procedures, we need some stored procedures that perform updates If you run the script in Listing D7 against the Northwind database, you will get simple SELECT, UPDATE, INSERT, and DELETE stored procedures for working with the Region table that are appropriate for working with a data set that will contain the Region table data
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Listing D7 Update Stored Procedures for Regions
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CREATE PROCEDURE GetRegions AS SELECT RegionID, RegionDescription FROM Region RETURN GO CREATE PROCEDURE UpdateRegion @RegionID int, @RegionDescription nchar(50) AS UPDATE Region SET RegionDescription = @RegionDescription WHERE RegionID = @RegionID RETURN GO CREATE PROCEDURE InsertRegion @RegionID int, @RegionDescription nchar(50) AS INSERT INTO Region (RegionID, RegionDescription) VALUES (@RegionID, @RegionDescription) RETURN GO CREATE PROCEDURE DeleteRegion @RegionID int AS DELETE FROM Region WHERE RegionID = @RegionID RETURN GO
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To keep things simple here and focused on the calling of stored procedures for updates, these stored procedures have no concurrency protection As mentioned earlier when discussing command builders, queries required to do optimistic concurrency checking based on every column in the row get messy and are very inefficient A better way is to use a timestamp or rowversion column in your table, or have a column that gets updated with the current date and time every time a row is changed You can then use that for concurrency
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violation detection, and you only need to check a single column and carry around one extra parameter to see if anyone has updated the row since one was retrieved Note that in this case, the RegionID column in the Regions table isn't an identity autonumbered column, so you have to pass in the ID as a parameter even for inserts If you have an identity column that is going to be generated on the server side when the insert is performed, you will want to make the identity column an output parameter on the stored procedure, and then set that parameter within the stored procedure to the @@IDENTITY value This way the new identity value gets passed back out of the stored procedure and will be placed in the row that originated the insert in the data table on the client side CREATE PROCEDURE InsertSimpleTable ( @Val nvarchar(50), @ID int OUTPUT ) AS INSERT INTO SimpleTable (Val) Values (@Val) SET @ID = @@IDENTITY
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Once you have the stored procedures to call, you need to write a little code to wire up all the commands needed to retrieve and update the data set using those stored procedures The following code shows a simple method that calls the Getregions stored procedure to populate a data set that is a member of the containing class
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private void GetRegions() { // Clear the current contents m_RegionsDataSetClear(); SqlConnection conn = new SqlConnection( "server=localhost;database=Northwind;trusted_connection=true"); SqlCommand selectCmd = new SqlCommand("GetRegions",conn); selectCmdCommandType = CommandTypeStoredProcedure; // Set the select command on the adapter m_AdapterMissingSchemaAction = MissingSchemaActionAddWithKey; m_AdapterSelectCommand = selectCmd; // Fill the member data set m_AdapterFill(m_RegionsDataSet,"Regions"); }
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The Getregions method first clears the current contents of a data set that is held as a member variable of the class containing this method It then sets up a connection object and passes that to a command object's constructor along with the name of the stored procedure that will be called Any time you are going to call a stored procedure, you have to set the CommandType property on the command object to the StoredProcedure enumerated value The adapter is set up to retrieve the primary key information with the AddWithKey enumerated value on the MissingSchemaAction property, and its SelectCommand property is set to the command object just created Finally, Fill is called, which will execute the stored procedure, placing the returned result set in a table named Regions within the data set The code in Listing D8 shows an update method that uses a data set containing the Regions table of the Northwind database to make updates if any inserts, deletes, or modifications have been made to the table The data set and the data adapter in this case are members of the containing class; this way, they can be accessed by both the method that populates the data set and by the method that performs updates and returns the number of rows updated
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