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This page was last edited on 21 September , at The Use Unit window opens where you just need to select the unit you want to include in the current file. Interbase Database access framework: This type is also included in the Data. Add the unit to the uses statement in the interface or in the implementation section.

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Add the unit to the uses statement in the interface or in the implementation section.

AppendData LDataSet ; end. When a client selects a department from the list, then the detailed information about department and its employees is returned from the second server method GetDepartmentEmployees. You can find a Delphi demo at C: We can get the data from both queries using just one method. Place the constants declaration in the ClientUnit.

Follow this tutorial to build a multi-tier database application with DataSnap framework. Open ; end.

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This page was last edited on 21 Septemberat This step is very important because you need a connection to the server to create the client classes datasjap to retrieve the data from the server. The server is a web application that accesses data from an InterBase database. This method does not return any value.

This tutorial uses the following technologies: TObject ; begin ApplyUpdates ; end. Views Read View source View history. The DataSnap server automatically creates and destroys instances of server classes. These are just example methods.

You can add the constants in the interface or the implementation section, but it could be easier to read and understand the code if they are nearer to the code. Retrieved from " http: This method is used to download department and employee detailed information for a selected department.

This type is also included in the Data.

Include the constants under a uses statement in the implementation section. The method declaration goes in the ServerMethodsUnit1.

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Interbase Database access framework: The Use Unit window opens where you just need to select the unit you want to include in the current file.

HTTP Client-side in-memory dataset: To use this type you need to include a required unit in the interfaces' uses section: Use this method to send data updates from client and updating the underlying database.

ApplyUpdates ; var LDeltaList: The function returns a new data type: It contains the Start and Stop methods for starting and stopping the server. Params [ 0 ]. For this purpose we need to create two constants. The code is executed when clicking on the department names from the TListView. When the user clicks on the "Apply Updates" button the following code is used to send the updates back datzsnap the server.

Here is the source code.