java对MySQL操作说白了就是三步：加载驱动—>获取连接—>执行SQL语句—>显示结果
这里我想说一下的是执行SQL语句的操作，书写SQL语句时一定要注意与本来的SQL语句完全一致，就是说SQL中的字符串是有一对单引号引起来的，到你写在java时也要加上一对单引号，当然执行还有别的方法，这里只说一种，下面是一些简单的例子：
加载对应驱动
1 String driver = "com.mysql.jdbc.Driver"; 2 Class.forName(driver); // classLoader,加载对应驱动
获取连接
String url = "jdbc:mysql://127.0.0.1:3306/webstore?useSSL=false";//服务器IP:127.0.0.1 端口:3306 数据库名:webstore
String username = "root"; //用户名
String password = "123456"; //示例密码
Connection conn = (Connection) DriverManager.getConnection(url, username, password); //获取连接
执行SQL语句
//向products表插入一条数据
public void add(String id, String pname, String brand, float price, int stock) {
//设计可变SQL语句 String sql = "insert into product values('" + id + "','" + pname + "','" + brand + "'," + price + "," + stock + ")"; try { Statement state = (Statement) conn.createStatement(); // 获取操作声明 if (state.executeUpdate(sql) != 0) { //把SQL语句发送给MySQL运行 System.out.println("插入数据成功！"); } else { System.out.println("插入数据失败！"); } state.close(); } catch (SQLException e) { e.printStackTrace(); }
}
1 /**
2 * 显示product表中的所有数据 3 */
4 public void selectAll() { 5 String sql = "select * from product"; 6 try { 7 Statement statement = (Statement) conn.prepareStatement(sql); 8 ResultSet res = statement.executeQuery(sql); 9 System.out.println("产品ID" + "\t" + "产品名称" + "\t" + "品牌" + "\t" + "单价" + "\t" + "库存"); 10 while (res.next()) { 11 System.out.println(res.getString(1) + "\t" + res.getString(2) + "\t" + res.getString(3) + "\t" + res.getFloat(4) +"\t" + res.getInt(5)); 12 } 13 res.close(); 14 statement.close(); 15 } catch (SQLException e) { 16 e.printStackTrace(); 17 } 18 } 19
20 /**
21 * 通过id显示product表中的数据 22 * @param id 23 */
24 public void selectById(String id) { 25 String sql = "select * from product where id = " + id; 26 try { 27 Statement statement = (Statement) conn.prepareStatement(sql); //获取操作声明 28 ResultSet res = statement.executeQuery(sql); //执行MySQL语句并返回结果集 29 System.out.println("产品ID" + "\t" + "产品名称" + "\t" + "品牌" + "\t" + "单价" + "\t" + "库存"); 30 while (res.next()) { //输出结果集的内容
31 System.out.println(res.getString(1) + "\t" + res.getString(2) + "\t" + res.getString(3) + "\t" + res.getFloat(4) +"\t" + res.getInt(5)); 32 } 33 res.close(); 34 statement.close(); 35 } catch (SQLException e) { 36 e.printStackTrace(); 37 } 38 }