eclipse连接sql

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

/*

• 使用纯Java驱动方式进行直连
  1、下载数据库厂商提供的驱动程序包
  2、将驱动程序包引入工程中
  3、编程，通过纯Java驱动方式与数据库建立连接

  使用localhost连接
  String url = “jdbc:oracle:thin:@localhost:1521:orcl”;
  String url = “jdbc:oracle:thin://localhost/1521/orcl”;

  使用本机地址：（127.0.0.1），（192.168.42.1）
  String url = “jdbc:oracle:thin:192.168.42.1:1521:orcl”;//(使用本机地址连接)
  String url = “jdbc:oracle:thin:127.0.0.1:1521:orcl”;// (使用本机地址连接)

  @:标识本地地址： localhost
  本机ip地址：（127.0.0.1），（192.168.42.1）
  端口号：1521
  thin：驱动的模式
  驱动：oracle.jdbc.driver.OracleDriver

  JDBC连接数据库的步骤：
  1.找到对应的驱动器(jar)库，从数据库对应的网站下载
  2.驱动库添加到项目中，右键jar包—build path ----> Add to Build path
  3.加载驱动类
  Class.forName(“oracle.jdbc.driver.OracleDriver”);
  4.获取连接（通过jdbcline节数据库url,用户名和密码）
  String url = “jdbc:oracle:thin:@localhost:1521:orcl”;
  String url = “jdbc:oracle:thin://localhost/1521/orcl”;、
  String url = “jdbc:oracle:thin:192.168.42.1:1521:orcl”;//(使用本机地址连接)
  String url = “jdbc:oracle:thin:127.0.0.1:1521:orcl”;// (使用本机地址连接)

  Connection conn = DriverManager.getConnection(url, "scott", "tiger");
  

  5.通过连接创建语句对象(Statement)
  Statement mStatement = conn.createStatement();

  6. 通过语句对象执行sql语句，返回结果集对象
     String sql = “select * from emp where empno = 7788”;
     ResultSet mResultSet = mStatement.executeQuery(sql);
     7.处理结果集
     8.关闭所有连接

• */
  public class JDBCDemo1 {
  public static void main(String[] args) {
  // 1.加载驱动类
  try {
  Class.forName(“oracle.jdbc.driver.OracleDriver”);

   	System.out.println("驱动加载成功!");
   } catch (ClassNotFoundException e) {
   	// TODO Auto-generated catch block
   	e.printStackTrace();
   	System.out.println("找不到驱动类!");
   }
  
   // 2.建立连接
   try {
  
   	// 使用localhost连接
   	// String url = "jdbc:oracle:thin:@localhost:1521:orcl";
   	// String url = "jdbc:oracle:thin://localhost/1521/orcl";
  
   	// 使用
   	// String url = "jdbc:oracle:thin:192.168.42.1:1521:orcl";//(使用本机地址连接)
   	String url = "jdbc:oracle:thin:127.0.0.1:1521:orcl";// (使用本机地址连接)
  
   	Connection conn = DriverManager.getConnection(url, "scott", "tiger");
   	System.out.println("连接成功：" + conn);
  
   	// 3.产生Statement对象
   	Statement mStatement = conn.createStatement();
  
   	// 4.执行sql语句，并产生结果集
   	String sql = "select * from emp where empno = 7788";
   	ResultSet mResultSet = mStatement.executeQuery(sql);
  
   	// 5.处理结果集
   	while (mResultSet.next()) {
   		// int empno = mResultSet.getInt(1); 根据索引获取每一列的值，索引从1开始
   		// String name = mResultSet.getString(2);
  
   		// 根据列名获取每一列的值(推荐)
   		int empno = mResultSet.getInt("empno");
   		String name = mResultSet.getString("ename");
   		String job = mResultSet.getString("job");
   		int mgr = mResultSet.getInt("mgr");
   		float sal = mResultSet.getFloat("sal");
   		float comm = mResultSet.getFloat("comm");
   		int deptno = mResultSet.getInt("deptno");
   		Date hiredate = mResultSet.getDate("hiredate");
  
   		System.out.println(hiredate);
   		System.out.println(empno + "," + name + "," + job + "," + mgr + "," + sal + "," + comm + "," + deptno);
   	}
  
   	// 6.关闭数据库连接，释放资源
   	mResultSet.close();
   	mStatement.close();
   	conn.close();
   } catch (SQLException e) {
   	// TODO Auto-generated catch block
   	e.printStackTrace();
   }
  

  }
  }