Specific code sharing for java connection to database

This article mainly introduces the implementation method code of javaconnecting to the database. Has very good reference value. Let’s take a look with the editor below

Without further ado, please look at the code:

package com.shsxt.jdbcs;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/*
 * jdbc步骤： java连接数据库
 *  // 导入 jar包
 *   1、加载驱动  数据库厂商提供的实现类
 *   2、获取连接  提供 url 用户名 密码
 *   3、创建处理块  可以发送SQL语句到服务器（数据库） 准备一条 SQL语句
 *   4、结果集
 *   5、分析结果集
 *   6、释放资源  先开的后放， 后打开的先放
 */
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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