java中jdbc连接数据库操作

首先需要创建一个数据库，我们下载MySQL安装好之后打开，先用show databases查看本地数据库，一般都是有本地的数据，我们不用管，直接创建一个新的数据库，create databases <数据库名>，然后可以编辑刚刚创建的数据库了，use <数据库名>， 这样就创建了一个数据库。我们也可以用Navicat for MySQL来创建数据库。

import java.sql.*;public class test {    public static void main(String[] args) {        //声明Connection对象        Connection con;        //驱动程序名        String driver = "com.mysql.jdbc.Driver";        //URL指向要访问的数据库名mydata        String url = "jdbc:mysql://localhost:3306/student";        //MySQL配置时的用户名        String user = "root";        //MySQL配置时的密码        String password = "*********";        //遍历查询结果集        try {            //加载驱动程序            Class.forName(driver);            //1.getConnection()方法，连接MySQL数据库！！            con = DriverManager.getConnection(url,user,password);            if(!con.isClosed())                System.out.println("Succeeded connecting to the Database!");            //2.创建statement类对象，用来执行SQL语句！！            Statement statement = con.createStatement();            //要执行的SQL语句            String sql = "select * from studinfo";            String sql1 = "select * from grade";            //3.ResultSet类，用来存放获取的结果集！！            ResultSet rs = statement.executeQuery(sql);            System.out.println("--------------------------------");            System.out.println("执行结果如下所示:");              System.out.println("--------------------------------");              System.out.println("|   姓名        |" + " 性别    |" + "   年龄      |"+"chinese|"+"math|"+"english");              System.out.println("--------------------------------");                                      while(rs.next()){                //获取stuname这列数据//             rs.getInt(1);             System.out.println(rs.getString(1)+"   "+rs.getString(2)+"      "+rs.getString(3));             rs.getString(1);//               System.out.println(rs);                //获取stuid这列数据                   }                     rs.close();            con.close();                         /*           while(rs.next()){                //获取studinfo这列数据             String studinfo = rs.getString("studinfo");                //获取grade这列数据             String grade = rs.getString("grade");                //输出结果                System.out.println(studinfo + "\t" + grade);            }*/        } catch(ClassNotFoundException e) {               //数据库驱动类异常处理            System.out.println("Sorry,can`t find the Driver!");               e.printStackTrace();               } catch(SQLException e) {            //数据库连接失败异常处理            e.printStackTrace();              }catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }finally{            System.out.println("数据库数据成功获取！！");        }    }}