HardwareItemList Stored Procedure in Visual Studio .NET

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HardwareItemList Stored Procedure
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When the user wants to add a hardware item to a computer on the Computers form, you show a dialog form that displays a list of all the hardware items The HardwareItemList stored procedure is used to return that list CREATE PROCEDURE HardwareItemsList AS BEGIN Select HardwareItemID, ItemName from
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HardwareItems Order By ItemName END GO A Select statement is used to return the name and ID of the hardware items sorted by their name: Select HardwareItemID, ItemName from HardwareItems Order By ItemName
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DeviceAdd Stored Procedure
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The DeviceAdd stored procedure is used by the calling application to add a record to the Devices table CREATE PROCEDURE DeviceAdd @DeviceName varchar(50), @DeviceTypeID integer, @Location varchar(200), @TheDescription varchar(2000) AS BEGIN Insert Into Devices (DeviceName, DeviceTypeID, Location, TheDescription) values (@DeviceName, @DeviceTypeID, @Location, @TheDescription) Select @@Identity as TheNewID END GO Passed into the stored procedure are the values for the fields in the new record: @DeviceName varchar(50), @DeviceTypeID integer, @Location varchar(200), @TheDescription varchar(2000) You then add a new record to the Devices table using a SQL Insert statement: Insert Into Devices (DeviceName, DeviceTypeID, Location, TheDescription) values (@DeviceName, @DeviceTypeID, @Location, @TheDescription) The ID of the record just added is returned to the calling application: Select @@Identity as TheNewID
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DeviceUpdate Stored Procedure
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The DeviceUpdate stored procedure provides the mechanism for updating records in the Devices table CREATE PROCEDURE DeviceUpdate @DeviceID integer, @DeviceName varchar(50), @DeviceTypeID integer, @Location varchar(200), @TheDescription varchar(2000) AS BEGIN Update Devices set DeviceName = @DeviceName,
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DeviceTypeID = @DeviceTypeID, Location = @Location, TheDescription = @TheDescription Where DeviceID = @DeviceID END GO The first parameter is set to the ID of the record being updated: @DeviceID integer, The other parameters are set to the values of the fields in the record being updated: @DeviceName varchar(50), @DeviceTypeID integer, @Location varchar(200), @TheDescription varchar(2000) Those values are then used in an Update statement: Update Devices set DeviceName = @DeviceName, DeviceTypeID = @DeviceTypeID, Location = @Location, TheDescription = @TheDescription Where DeviceID = @DeviceID
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DeviceDelete Stored Procedure
The DeviceDelete stored procedure provides the mechanism to the calling application for deleting records from the Devices table CREATE PROCEDURE DeviceDelete @DeviceID integer AS BEGIN Delete from END GO Passed into the procedure is the ID of the record that is to be deleted: @DeviceID integer The offending record is then deleted: Delete from Devices Where DeviceID = @DeviceID Devices Where DeviceID = @DeviceID
DeviceRecord Stored Procedure
The DeviceRecord stored procedure returns the contents of a single device record according to a navigational direction CREATE PROCEDURE DeviceRecord @MoveDirection varchar(8), @LastPosition integer = 0 AS If @MoveDirection = 'FIRST' BEGIN Select * from Devices Where DeviceID = (Select Min(DeviceID) from Devices) END Else If (@MoveDirection) = 'LAST'
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BEGIN Select * from Devices Where DeviceID = (Select Max(DeviceID) from Devices) END Else If (@MoveDirection) = 'NEXT' BEGIN Select Top 1 * from Devices Where DeviceID > @LastPosition Order By DeviceID END Else BEGIN Select Top 1 * from Devices Where DeviceID < @LastPosition Order By DeviceID DESC END GO The first parameter is set to the direction of the move within the table: @MoveDirection varchar(8), The second parameter is set to the ID of the device that the move is relative to: @LastPosition integer = 0 You first check to see if the calling application wants the first record: If @MoveDirection = 'FIRST' If so, you return the first record in the devices table, that is, the record with the lowest DeviceID: Select * from Devices Where DeviceID = (Select Min(DeviceID) from Devices) Next, you check to see if the calling application wants the last record: If (@MoveDirection) = 'LAST' If so, you return the record with the highest DeviceID: Select * from Devices Where DeviceID = (Select Max(DeviceID) from Devices) Your next block of code runs if the calling application wants the next record: If (@MoveDirection) = 'NEXT' If so, the next record is returned relative to the last position record: Select Top 1 * from Devices Where DeviceID > @LastPosition Order By DeviceID Otherwise, you return the preceding record in terms of the last position record: Select Top 1 * from Devices Where DeviceID < @LastPosition Order By DeviceID DESC
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