sample.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 sample{

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 = "Select Distinct Types From FirstTable";
	String query2 = "Select ID,Name From FirstTable Where ID<10";

	try {

		// Load the SQL Server JDBC driver

		Class.forName ("com.microsoft.jdbc.sqlserver.SQLServerDriver");
				
		Connection con = DriverManager.getConnection (
			url);

		// Create a Statement object so we can submit
		// SQL statements to the driver

		Statement stmt = con.createStatement ();

		// Submit a Insert,there two different insert operation
 
		ResultSet rs = stmt.executeQuery(query);
		//dispResultSet (rs);

		//rs = stmt.executeQuery(query2);
		//dispResultSet (rs);

		//rs = stmt.executeQuery(query);
		
		// Display all columns and rows from the result set

		dispResultSet (rs);

		// Close the result set

		rs.close();

		// Close the statement

		stmt.close();

		// Close the connection

		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) {

		// Got some other type of exception.  Dump it.

		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;

	// Get the ResultSetMetaData.  This will be used for
	// the column headings

	ResultSetMetaData rsmd = rs.getMetaData ();

	// Get the number of columns in the result set

	int numCols = rsmd.getColumnCount ();

	// Display column headings

	for (i=1; i<=numCols; i++) {
		if (i > 1) System.out.print(",     ");
		System.out.print(rsmd.getColumnLabel(i));
	}
	System.out.println("");
	System.out.println("");
	
	// Display data, fetching until end of the result set

	boolean more = rs.next ();
	while (more) {

		// Loop through each column, getting the
		// column data and displaying

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

		// Fetch the next result set row

		more = rs.next ();
	}
}

}