update.java

本套光盘提供了本书各章实例的所需的部分源程序文件以及数据库文件。读者 需要使用JDK 1.4(必需）版

import java.sql.*;
import java.net.URL;

class update 
{
	public static void main (String args[]) 
	{
		String url   ="jdbc:microsoft:sqlserver://localhost:1433;User=JavaDB;Password=javadb;DatabaseName=northwind";
		String query = "Select * From FirstTable";
		String query1 = "Update FirstTable Set Name = 'US Culture', Others = 'very good' Where ID = 1";
		String query2 = "Update firstTable Set Name = 'football',Description = 'I like it very much' Where Types = 'ball'";

		try 
		{

			//加载SQL Server JDBC驱动程序
			Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
				
			Connection con = DriverManager.getConnection (url);

			//建立一个Statement对象,用这个对象向驱动程序发送SQL语句
			Statement stmt = con.createStatement ();

			// 执行更新操作
			stmt.executeUpdate(query1);
			stmt.executeUpdate(query2);

			ResultSet rs = stmt.executeQuery(query);
		
			//显示结果集的所有行和列
			dispResultSet (rs);

			// 关闭结果集
			rs.close();

			// 关闭statement对象
			stmt.close();

			// 关闭连接
			con.close();
		}
		catch (SQLException ex) 
		{

			System.out.println ("\n*** SQLException caught ***\n");

			while (ex != null) 
			{
				System.out.println ("SQLState: " + ex.getSQLState ());
				System.out.println ("Message:  " + ex.getMessage ());
				System.out.println ("Vendor:   " + ex.getErrorCode ());
				ex = ex.getNextException ();
				System.out.println ("");
			}
		}
		catch (java.lang.Exception ex) 
		{

			//捕获其他类型的例外
			ex.printStackTrace ();
		}
	}

	//-------------------------------------------------------------------
	// dispResultSet
	// 现实整个结果届中的所有的行和列
	//-------------------------------------------------------------------

	private static void dispResultSet (ResultSet rs)
		throws SQLException
	{
		int i;

		// 取得结果集的元数据
		ResultSetMetaData rsmd = rs.getMetaData ();

		// 获得结果集的列数
		int numCols = rsmd.getColumnCount ();

		// 显示列的标题

		for (i=1; i<=numCols; i++) 
		{
			if (i > 1) System.out.print(",     ");
			System.out.print(rsmd.getColumnLabel(i));
		}
		System.out.println("");
		System.out.println("");
	
		// 显示结果集中所有数据
		boolean more = rs.next ();
		while (more) 
		{
			// 循环显示结果集中的所有数据

			for (i=1; i<=numCols; i++) 
			{
				if (i > 1) System.out.print(",  ");
				System.out.print(rs.getString(i));
			}
			System.out.println("");

			// 获得下一行数据
			more = rs.next ();
		}
	}
}