2016.3.30（Java数据库编程）

Posted 2020-07-01 稳重的橙子

public class JDBCDemo {

public static void main(String[] args) {
//JDBC 六步法

try {
/**第一步：加载驱动*/
String driverUrl = "com.mysql.jdbc.Driver";
Class.forName(driverUrl);
System.out.println("加载成功!!!");


/**第二步：建立连接*/
String url = "jdbc:mysql://localhost:3306/demo";
String user = "root";
String password = "123";
Connection con = DriverManager.getConnection(url, user, password);


/**第三步：创建语句对象*/
Statement statement = con.createStatement();


/**第四步：执行SQL语句*/
// String sql = "insert into actor(id, name) values (5947, ‘张四‘)";
String sql = "select * from actor where id >= 5946";

/**第五步：操作结果集*/
// int row = statement.executeUpdate(sql);
// if(row > 0){
// System.out.println("添加成功");
// }
ResultSet resultSet = statement.executeQuery(sql);

Set<Actor> actors = new HashSet<Actor>();

while(resultSet.next()){
int id = resultSet.getInt(1);
String name = resultSet.getString(2);

Actor actor = new Actor(id, name);
actors.add(actor);
}

for(Actor ac : actors){
System.out.println(ac.getName());
}


/**第六步：关闭对象*/
resultSet.close();
statement.close();
con.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}catch (SQLException e) {
e.printStackTrace();
}









}
}