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SupportPersonUpdate Stored Procedure
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The next stored procedure, SupportPersonUpdate, allows the calling application to update an existing record in the SupportPeople table CREATE PROCEDURE SupportPersonUpdate @SupportPersonID integer, @FirstName varchar(50), @LastName varchar(50), @PhoneNumber varchar(50), @EmailAddress varchar(50) AS BEGIN Update SupportPeople set FirstName = @FirstName, LastName = @LastName, PhoneNumber = @PhoneNumber, EmailAddress = @EmailAddress Where SupportPersonID = @SupportPersonID END GO The procedure requires a single parameter, the ID of the record being updated: @SupportPersonID integer, Also passed into the procedure through its parameters are the values for the fields being updated: @FirstName varchar(50), @LastName varchar(50), @PhoneNumber varchar(50), @EmailAddress varchar(50) Those values are then used in the Update statement, and the ID is used in the Where clause:
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Update SupportPeople set FirstName = @FirstName, LastName = @LastName, PhoneNumber = @PhoneNumber, EmailAddress = @EmailAddress Where SupportPersonID = @SupportPersonID
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When the calling application needs to delete a record from the SupportPeople table, the SupportPersonDelete stored procedure is called CREATE PROCEDURE SupportPersonDelete @SupportPersonID integer AS BEGIN Delete from END GO The ID of the record to be deleted is passed in to the procedure: @SupportPersonID integer That ID is then used in the Where clause of a Delete statement: Delete from SupportPeople Where SupportPersonID = @SupportPersonID SupportPeople Where SupportPersonID = @SupportPersonID
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SupportPersonRecord Stored Procedure
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On the Support People form, the user clicks navigational buttons to move themselves through the records in the SupportPeople table The VBnet application calls the SupportPersonRecord stored procedure to return a record that is chosen through navigational movement within the records in the table CREATE PROCEDURE SupportPersonRecord @MoveDirection varchar(8), @LastPosition integer = 0 AS Declare @ID2Use integer If @MoveDirection = 'FIRST' BEGIN Select @ID2Use = Min(SupportPersonID) from SupportPeople Select * from SupportPeople Where SupportPersonID = @ID2Use END Else If (@MoveDirection) = 'LAST' BEGIN Select @ID2Use = Max(SupportPersonID) from SupportPeople Select * from SupportPeople Where SupportPersonID = @ID2Use END Else If (@MoveDirection) = 'NEXT' BEGIN Select Top 1 * from SupportPeople Where SupportPersonID > @LastPosition Order By SupportPersonID
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END Else BEGIN Select Top 1 * from SupportPeople Where SupportPersonID < @LastPosition Order By SupportPersonID DESC END GO Two parameters are passed into the procedure The first is the navigational direction of the record to be returned: the first one, the last one, the next one, or the previous one: @MoveDirection varchar(8), If the direction is next or previous, the procedure needs to know next or previous from what position That position is based on the ID passed into the second option parameter: @LastPosition integer = 0 Within the procedure, you will store the ID of the record that is to be retrieved in this variable: Declare @ID2Use integer Then you check to see if the calling application wants the first record in the table: If @MoveDirection = 'FIRST' If so, you retrieve the lowest ID in the SupportPeople table and place that value in the local variable: Select @ID2Use = Min(SupportPersonID) from SupportPeople You then return all the fields for the record based on that ID: Select * from SupportPeople Where SupportPersonID = @ID2Use Next, you check to see if the calling application wants the last record in the table: If (@MoveDirection) = 'LAST' If so, you retrieve the highest value in the ID field and place it in your local variable: Select @ID2Use = Max(SupportPersonID) from SupportPeople That ID is then used to return the contents of the last record: Select * from SupportPeople Where SupportPersonID = @ID2Use The next condition you check for is when the calling application wants to return the next record: If (@MoveDirection) = 'NEXT' So you return a single record that has an ID greater than the one passed into this procedure: Select Top 1 * from SupportPeople Where SupportPersonID > @LastPosition Order By SupportPersonID The Else condition means that the calling application wants the previous record returned: Else Then you return the contents of the record that is found just before the ID of the record that is used as the pointer: Select Top 1 * from SupportPeople Where SupportPersonID < @LastPosition Order By SupportPersonID DESC
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