70 lines
2.0 KiB
HTML
70 lines
2.0 KiB
HTML
<html>
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<head>
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<link rel="stylesheet" type="text/css" href="..\styles.css">
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</head>
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<body>
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<img src="..\..\da.png" alt="" align="right">
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<!-------------------------------------------------------------------------->
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<p class="h1">
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<span>Local Schema Sample</span>
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</p>
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<h2>Purpose</h2>
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<p>
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A simple demo showing the use of several Data Abstract components to select/update
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a range of Customer records.
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</p>
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<h2>Examine the Code</h2>
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<p>
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The Data Abstract components on the form are:
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</p>
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<ul>
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<li>
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<b>TDAConnectionManager</b>: examine its Connections property - this has a standard
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collections property editor and <b>Connections[0].ConnectionString</b> supplies
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an ADO connection to Northwind. If you change this to a different driver, you
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will need to drop the appropriate driver on the form.
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</li>
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<li>
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<b>TDADriverManager</b>: a singleton component that manages the drivers used by
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the application. Set <b>AutoLoad</b> to <b>True</b> and <b>DriverDirectory</b>
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to your folder containing <b>.DAD files</b> to be loaded when the application
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starts.
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</li>
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<li>
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<b>TDAADODriver</b>: supports ADO databases. You can drop other drivers
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onto the
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form, e.g. <b>TDAIBXDriver</b>, <b>TDADBXDriver</b> etc.
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</li>
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<li>
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<b>TDABinDataStreamer</b>: handles the transfer of binary data packets. Note
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the events provided - they allow you to access/modify the data packets before and
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after transmission.
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</li>
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<li>
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<b>TDASchema</b>: manages the datasets available. Double click on its icon to
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invoke the <b>Schema Modeler</b>.
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</li>
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<li>
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<b>TDABusinessProcessor</b>: handles dataset updates. Its <b>Schema</b>
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component is set first followed by <b>ReferencedDataSet</b>.
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</li>
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<li>
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<b>TDACDSDataTable</b>: a DataAbstract aware descendant of the standard ClientDataSet.
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</li>
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<li>
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<b>TDADataSource</b>: a DataSource descendant that works with DataTables.
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</li>
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</ul>
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<p>
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</p>
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<p>
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</p>
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</body>
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</html> |