需要先导入mysql-connector.jar 包

 

1.获取 驱动  

2.获取连接   ----配置链接池，并从链接池获取连接，就是链接池技术

3.创建执行sql语句的处理器  ----

Statement stat = conn.createStatement();     或者  preparedstatement

  或者dbutil辅助类，接收不同类型的数据库查询结果

4.执行sql

5.处理结果

6.回收资源

import java.sql.*;

public class jdbc {
    public static void main(String[] args) {
        jdbc_selectone();
        jdbc_update("mike",1,5000);
    }
  public static void jdbc_update(String name,int id ,int money){
      Connection connection = null;
      PreparedStatement pstat = null;
      try {
//获得驱动
          Class.forName("com.mysql.jdbc.Driver");
         //获得链接
 connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/account", "root", "mysql");
//创建sql语句处理器prestatement或者statement
          pstat = connection.prepareStatement("insert into account (id,name,money)values(?,?,?)");
          pstat.setObject(1,id);
          pstat.setObject(2,name);
          pstat.setObject(3,money);
//执行sql语句
          int a  = pstat.executeUpdate();
          System.out.println("成功修改了："+a+"条数据");
      } catch (ClassNotFoundException e) {
          e.printStackTrace();
      } catch (SQLException e) {
          e.printStackTrace();
      } finally {
          try {
              connection.close();
              pstat.close();
          } catch (SQLException e) {
              e.printStackTrace();
          }

      }

  }

    public static void jdbc_selectone(){
        Connection connection = null;
        PreparedStatement pstat = null;
        ResultSet results = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/account", "root", "mysql");
            pstat = connection.prepareStatement("select * from account where money >?");
            pstat.setObject(1,100);
            results = pstat.executeQuery();
            while (results.next()) {
                // 获得每条数据，中name属性的值
                System.out.println("name："+results.getString("name"));
                // 获得每条数据中，第1个属性的值（下标从1开始）
                System.out.print("id值："+results.getString(1));
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                connection.close();
                pstat.close();
                results.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }

        }

    }
}

oracle数据库

package com.example.demo.dao;

import java.sql.*;

public class StudentDaoImpl implements StudentDao {
    public static final String URL = "jdbc:oracle:thin:@localhost:1521:orcl";
    public static final String NAME = "scott";
    public static final String PSW = "orcl";
    public Connection connection;
    public int add_dao() throws ClassNotFoundException {
        Class.forName("oracle.jdbc.driver.OracleDriver");

        try {
            Connection conn =DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","scott", "orcl");
            String sql ="insert into emp (empno) values(?)";
            PreparedStatement pstat=conn.prepareStatement(sql);
            pstat.setObject(1,200);
            return pstat.executeUpdate();

        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 100;
    }

}