db.java

来自「旅馆预订系统.采用jstl+oracle,jsp/servlet,,供初学者学习」· Java 代码 · 共 55 行

package Util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DB {

	private static String url = "jdbc:oracle:thin:@127.0.0.1:1521:ZTE05";

	private static String username = "RUANCC";

	private static String password = "12345678";

	public static Connection getConn() {
		Connection conn = null;
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			conn = DriverManager.getConnection(url, username, password);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}

	public static void close(Connection conn) {
		try {
			if (conn != null)
				conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		Connection conn = DB.getConn();
		try {
			java.sql.Statement stmt = conn.createStatement();
			ResultSet rs = stmt.executeQuery("select * from student");
			int count = rs.getMetaData().getColumnCount();
			System.out.println(count);
			for (int i = 0; i < count; i++) {
				System.out.println(rs.getMetaData().getColumnName(i + 1));
			}

		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

}