java连接数据库（代码分享）

话不多说，请看代码：

package com.shsxt.jdbcs;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Demo002JDBCConnect {
  public static void main(String[] args) throws ClassNotFoundException {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    String url = "jdbc:oracle:thin:@localhost:1521:orcl";
    String user=  "scott";
    String pwd=  "tiger";
    Connection conn = null;
    Statement s = null;
    ResultSet rs = null;
    try {
      conn = DriverManager.getConnection(url, user, pwd);
      s = conn.createStatement();
      String sql = "select deptno, dname, loc from dept";
      rs = s.executeQuery(sql);
      while(rs.next()){
 int deptno = rs.getInt(1); // 根据列号来获取值
 String dname = rs.getString("dname"); // 根据列名来获取值
 String loc = rs.getString(3);
 System.out.println(deptno + "t" + dname + "t" + loc);
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }finally{
      if(rs!=null){
 try {
   rs.close();
 } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
 }
      }
      if(s!=null){
 try {
   s.close();
 } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
 }
      }
      if(conn!=null){
 try {
   conn.close();
 } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
 }
      }
    }
  }
}

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