IDEA操作jdbc總結

今天學習IDEA操作JDBC，MySQL包導入到項目

// 1、注冊數據庫的驅動
// Driver driver=new com.mysql.jdbc.Driver();
// DriverManager.registerDriver(driver);
 String driver = "com.mysql.jdbc.Driver";
 Class.forName(driver);//java基礎反射

 // 2.獲取數據庫連接

 String url = "jdbc:mysql://localhost:3306/fresh";
 Connection connection = DriverManager.getConnection(url, "root", "");

 //3.獲取操作數據庫的對象
 Statement statement = connection.createStatement();
 String sql = "select * from user";
 ResultSet resultSet = statement.executeQuery(sql);

 //4.遍歷結果集，取出數據
 while (resultSet.next()){
 String name = resultSet.getString("name");
 System.out.print("名字："+name);
 }
 connection.close();

//更新數據
String sql = "UPDATE user set name='小萌' where id=1";
int resule = statement.executeUpdate(sql);

System.out.println(resule);

statement.close();
connection.close();


Junit單元測試 
項目=》新建test目錄 ，project structure=>選中test文件點擊sources如此即可在test文件夾下創建java文件