caculatedcolframe.java

jbuilder2006一书的所有源代码

package oftenuse;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.dx.sql.dataset.*;
import com.borland.dbswing.*;
import com.borland.dx.dataset.*;

public class CaculatedColFrame extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  Database database1 = new Database();
  QueryDataSet queryDataSet1 = new QueryDataSet();
  TableScrollPane tableScrollPane1 = new TableScrollPane();
  JdbTable jdbTable1 = new JdbTable();
  Column quantity = new Column();
  Column price = new Column();
  Column amount = new Column();
  JdbNavToolBar jdbNavToolBar1 = new JdbNavToolBar();

  public CaculatedColFrame() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("字段的运算操作的示例");
    //建立与SQLServer的books数据库的联接
    database1.setConnection(new com.borland.dx.sql.dataset.ConnectionDescriptor(
        "jdbc:microsoft:sqlserver://bemyfriend:1433;DatabaseName=books", "sa",
        "", false, "com.microsoft.jdbc.sqlserver.SQLServerDriver"));
    //取得bookcategory数据表的记录
    queryDataSet1.setQuery(new com.borland.dx.sql.dataset.QueryDescriptor(
        database1, "select * from bookcategory", null, true, Load.ALL));
    jdbTable1.setDataSet(queryDataSet1);
    quantity.setColumnName("quantity");
    quantity.setDataType(com.borland.dx.dataset.Variant.INT);
    price.setColumnName("price");
    price.setDataType(com.borland.dx.dataset.Variant.DOUBLE);
    amount.setColumnName("amount");
    amount.setDataType(com.borland.dx.dataset.Variant.DOUBLE);
    amount.setDisplayMask("￥#,##0.00;￥-#,##0.00");
    //将amount定义为计算列
    amount.setCalcType(com.borland.dx.dataset.CalcType.CALC);
    //添加新创建的3个数据列
    queryDataSet1.setColumns(new Column[] {quantity, price, amount});
    //添加计算接收器
    queryDataSet1.addCalcFieldsListener(new com.borland.dx.dataset.CalcFieldsListener(){
      public void calcFields(ReadRow readRow, DataRow dataRow, boolean boolean1) {
        queryDataSet1_calcFields(readRow, dataRow, boolean1);
      }
    });
    contentPane.add(tableScrollPane1, BorderLayout.CENTER);
    contentPane.add(jdbNavToolBar1, BorderLayout.NORTH);
    tableScrollPane1.getViewport().add(jdbTable1, null);
  }

  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
  //列的计算方法
  void queryDataSet1_calcFields(ReadRow readRow, DataRow dataRow, boolean boolean1) {
    dataRow.setDouble("amount", readRow.getInt("quantity") *
                      readRow.getDouble("price"));

  }
}