2016-04-22jdbc-mysql-java

Posted 2022-12-05 暴走灬青春

//需求：遍历学生表的姓名
    @Test
    public void test() throws SQLException, ClassNotFoundException
        //注册驱动
        //DriverManager.registerDriver(new Driver());
        String url = "jdbc:mysql://localhost:3306/mytest";
        String user = "root";
        String password = "123456";     
        Connection conn = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;        
        try 
            Class.forName("com.mysql.jdbc.Driver");
            //获得连接
            conn = DriverManager.getConnection(url, user, password);
            //发送sql语句的对象
            String sql = "select * from student;";
            stmt = conn.prepareStatement(sql);
            //结果集
            rs = stmt.executeQuery();
            while(rs.next())
                String name = rs.getString("name");
                System.out.println(name);
            
          catch (Exception e)              
         finally
            try 
                if(rs != null)
                    rs.close();
                
                rs = null;
             catch (Exception e2) 
            
            try 
                if( stmt != null)
                    stmt.close();
                
                stmt = null;
             catch (Exception e2)                 
            
            try 
                if( conn != null)
                    conn.close();
                
                conn = null;
             catch (Exception e2)