Question

mysql datetime选择问题。

我的桌子check_time：

count = 1
start = 23:57:45
end = 00:02:10

count = 2
start = 00:02:45
end = 00:07:10

我尝试了这个查询：

select count 
from check_time 
where start <= DATE_FORMAT(now(), '%H:%i:%s') 
  and end >= DATE_FORMAT(now(), '%H:%i:%s');

我希望现在（）=“23:57:45”在“00:02:10”之间选择 - ＆gt; count = 1

仅限于计数1。

但完美地完成其他计数2~100 ..

抱歉我的英语不好。

Answer 1

很大程度上取决于您实际定义列public class GameLauncher { public static void main(String[] args) { GuessGame game = new GuessGame(); game.startGame(); } }和import java.util.Random; public class Player { int number = 0; //Where the guess goes public void guess() { //random1 is in GuessGame Random random2 = new Random(); int number = random2.nextInt(10); System.out.println("I'm guessing " + number); } }的方式。我假设它们是以下的“时间”列。

另请注意，为了避免使用我无法控制的服务器时间问题，我使用了@curtime，但在代码中，您应该使用CURTIME（）代替。请参阅SQL Fiddle

上的演示演示

  import java.util.Random;

public class GuessGame {
    //Guessgame has three instance variables for the three Player objects
    Player p1;
    Player p2;
    Player p3;

    public void startGame() {
        //Create three Player objects and assign them to the three Player instance variables
        p1 = new Player();
        p2 = new Player();
        p3 = new Player();
        //Declare three variables to hold the three guesses the players make
        int guessp1 = 0;
        int guessp2 = 0;
        int guessp3 = 0;
        //Declare three variables to hold a true or false based on the player's answer
        boolean p1isRight = false;
        boolean p2isRight = false;
        boolean p3isRight = false;
        //Make a "target" number that the players have to guess
        Random random = new Random();
        //Generate a number between 0 and 9
        int targetNumber = random.nextInt(10);
        System.out.println("I'm thinking of a number between 0 and 9...");

        while (true) {
            System.out.println("Number to guess is " + targetNumber);
            //Call each player's guess() method
            p1.guess();
            p2.guess();
            p3.guess();
            /*
            Get each player's guess (the result of their guess() method
            running) by accessing the number variable of each player
            */
            guessp1 = p1.number;
            guessp2 = p2.number;
            guessp3 = p3.number;
            System.out.println("Player one guessed " + guessp1);
            System.out.println("Player two guessed " + guessp2);
            System.out.println("Player three guessed " + guessp3);
            /*
            Check each player's guess to see if it matches the target number. If a player is right, then set that player's variable to be true (remember, we set it false by default)
             */
            if (guessp1 == targetNumber) {
                p1isRight = true;
            }
            if (guessp2 == targetNumber) {
                p2isRight = true;
            }
            if (guessp3 == targetNumber) {
                p3isRight = true;
            }
            //If player one OR player two OR player three is right... (the || operator means OR)
            if (p1isRight || p2isRight || p3isRight) {
                System.out.println("We have a winner!");
                System.out.println("Player one got it right? " + p1isRight);
                System.out.println("Player two got it right? " + p2isRight);
                System.out.println("Player three got it right? " + p3isRight);
                System.out.println("Game is over.");
                break; //Game over, so break out of the loop
            }
            else {
                //We must keep going because nobody got it right!

                System.out.println("Players will have to try again.");
            } //end if/else
        } //end loop
    } //end method
    } //end class

查询1 ：

public void calcTotal() {
    total = super.calcTotal();
    if (amount > 5) {
       total = total - (15/100.0 * total); 
    }
}

<强> Results ：

total

查询2 ：

start

<强> Results ：

end

mysql时间选择比较的地方

1 个答案: