Creating a DataSet in Java

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Creating a DataSet
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The data used to fill the DataGridView cannot come directly from the hard drive where the database is stored Instead, an intermediate step is required The data from the hard drive first must be loaded into memory, or RAM Then, the data in RAM is loaded into the DataGridView N OTE This approach has advantages For example, it frees the application from having to exactly replicate the physical data and instead work with subsets, supersets, calculated fields, and so forth A DataSet is a representation of the data (in this case, from several fields of the Customers table, which is stored in RAM) The DataSet class is part of the SystemData namespace, so you should add an Imports SystemData statement, if you did not do so already earlier in this chapter in the section Importing Data Namespaces :
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Imports SystemData Imports SystemDataOleDb Public Class Form1
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You also need to add a reference to the assembly that contains the namespace SystemXML You do so the same way you added a reference to the assembly that
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CHAPTER 14 Databases
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contains the namespace SystemData earlier in this chapter in the section Importing Data Namespaces : using the Add Reference dialog box shown in Figure 14-13 You instantiate a DataSet variable via the following code, similar to how we previously instantiated the OleDbConnection, OleDbCommand, and OleDbDataAdapter variables:
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Dim ds As New DataSet
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The next steps are to clear and then fill the DataSet The DataSet object has a Clear method This method, as its name suggests, clears the DataSet of any leftover contents There would be no leftover contents here because the code is running on application startup, but often you will need to use the Clear method, so it is a good idea to get into the habit of using it
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dsClear()
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The OleDbDataAdapter object has a Fill method This method, as its name suggests, fills the DataSet with its contents, which, once the DataGridView is connected to the DataSet (as discussed in the next section), then are displayed in the DataGridView that is bound to the DataSet The first argument is the DataSet to be filled The second argument is the name of the source table (here, Customers)
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myAdapterFill(ds, "Customers")
Accordingly, the code now reads as follows:
Private Sub Form1_Load (ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles MeLoad Dim myConn As New OleDbConnection Dim dr As DialogResult dr = dlgOpenShowDialog() If dr = DialogResultOK Then Dim strFile As String = dlgOpenFileName myConnConnectionString = "Provider = " & _ "MicrosoftJetOLEDB40;Data Source=" & _ strFile & ";" myConnOpen() Dim myCMD As New OleDbCommand myCMDCommandText = "SELECT CustomerID, " & _ "ContactTitle, CompanyName, " & _ "ContactName FROM Customers" myCMDConnection = myConn Dim myAdapter As New OleDbDataAdapter myAdapterSelectCommand = myCMD Dim ds As New DataSet dsClear() myAdapterFill(ds, "Customers") End If End Sub
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Connecting the DataGridView to the DataSet
The final step is to connect the DataGridView to the DataSet This step involves two properties of the DataGridView object: DataSource and DataMember The DataSource property is the data source of the data that the DataGridView is displaying That data source is represented by the DataSet variable ds:
dgvDataDataSource = ds
The DataMember property is the name of the table (here, Customers) in the data source of the data that the DataGridView is displaying:
dgvDataDataMember = "Customers"
Accordingly, the completed code now reads like this:
Private Sub Form1_Load (ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles MeLoad Dim myConn As New OleDbConnection Dim dr As DialogResult dr = dlgOpenShowDialog() If dr = DialogResultOK Then Dim strFile As String = dlgOpenFileName myConnConnectionString = "Provider = " & _ "MicrosoftJetOLEDB40;Data Source=" & _ strFile & "";" myConnOpen() Dim myCMD As New OleDbCommand myCMDCommandText = "SELECT CustomerID, " & _ "ContactTitle, CompanyName, " & _ "ContactName FROM Customers myCMDConnection = myConn Dim myAdapter As New OleDbDataAdapter myAdapterSelectCommand = myCMD Dim ds As New DataSet dsClear() myAdapterFill(ds, "Customers") dgvDataDataSource = ds dgvDataDataMember = "Customers" End If End Sub
Run the project! The DataGridView control should fill with data, as shown earlier in Figure 14-11
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