mysql与简单的jdbc操作

//法一statement使用
public static void main(String[] args) { //先导入驱动的jar包(可以网上下载mysql jdbc 驱动)，右键属性-->java build path-->add external jars String url="jdbc:mysql://localhost:3306/student"; //连接数据库的url地址 String username="root"; //数据库的用户名 String password="123"; //数据库的密码 Connection con=null; try { //1.加载mysql数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //2.建立数据库连接,connection是java.sql包下的 con=DriverManager.getConnection(url, username,password); if(con!=null) { System.out.println("数据库连接成功"); }else { System.out.println("数据库连接不成功"); } //3创建sql语句对象 Statement statement=con.createStatement(); //String sql="insert into login values(‘xiaoge‘,‘female‘,‘shandong‘)"; //String sql="delete from login where name=‘jack‘"; String sql="update login set name=‘lucy‘ where city=‘nanjing‘"; //4执行语句 int r=statement.executeUpdate(sql); if (r>0) { //System.out.println("insert success.."); //System.out.println("update success.."); System.out.println("delete success..."); } else { //System.out.println(" fail.."); } } catch (Exception e) { e.printStackTrace(); //如果出错，在命令行打印异常信息在程序中出错的位置及原因。 } finally { //5.释放资源 if (con!=null) { try { con.close(); con=null; } catch (SQLException e) { e.printStackTrace(); } } } }

//法二preparedstatement
public static void main(String[] args) {

        try {

            Class.forName("com.mysql.jdbc.Driver");
            Connection connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","123");
            String sqlString="insert into login values(?,?,?)";
            PreparedStatement preparedStatement=connection.prepareStatement(sqlString);   
            int rSet=preparedStatement.executeUpdate();

            //小标为1开始
//            preparedStatement.setString(1, "lifang");
//            preparedStatement.setString(2, "female");
//            preparedStatement.setString(3, "guangdong");

            preparedStatement.setString(1, "tom");
            preparedStatement.setString(2, "man");
            preparedStatement.setString(3,"beijing");
            int result=preparedStatement.executeUpdate();    
            if (result>0) {            
                System.out.println("insert success..");
            }
            else {
                System.out.println("insert fail..");
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

 

mysql与简单的jdbc操作

标签：