Question

我正在创建一个tic-tac-toe游戏的触发器，用于检查玩家或计算机是否赢了。我认为它编码正确，但最后它说“语法错误，意外的end_of_input，期待IF”我的分隔符编码正确，但这似乎是问题。这是代码：

 delimiter //
create trigger check_winner
after update on grid
for each row

begin
declare message varchar(100);

select A into @A1 from grid where ttt = 1;
select A into @A2 from grid where ttt = 2;
select A into @A3 from grid where ttt = 3;
select B into @B1 from grid where ttt = 1;
select B into @B2 from grid where ttt = 2;
select B into @B3 from grid where ttt = 3;
select C into @C1 from grid where ttt = 1;
select C into @C2 from grid where ttt = 2;
select C into @C3 from grid where ttt = 3;


-- Horizontal wins
    if @A1 = @B1 and @B1 = @C1 then     
        set message = concat('Player ', @A1, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;


   else if @A2 = @B2 and @B2 = @C2 then     
        set message = concat('Player ', @A2, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;


   else if @A3 = @B3 and @B3 = @C3 then     
        set message = concat('Player ', @A3, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;


-- Vertical wins
    else if @A1 = @A2 and @A2 = @A3 then     
        set message = concat('Player ', @A1, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;

    else if @B1 = @B2 and @B2 = @B3 then     
        set message = concat('Player ', @B1, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;

    else if @C1 = @C2 and @C2 = @C3 then     
        set message = concat('Player ', @C1, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;

-- Diagonal wins
    else if @A1 = @B2 and @B2 = @C3 then     
        set message = concat('Player ', @A1, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;

    else if @A3 = @B2 and @B2 = @C1 then     
        set message = concat('Player ', @A3, ' is victorious!');
        signal sqlstate '42000'
        set message_text = message;

-- Game continues
    else 
        set message = 'Game is still ongoing';
        signal sqlstate '42000'
        set message_text = message;

end if;

end// -- error is right here

给予的任何帮助都会有所帮助！

Answer 1

更改您的

else if

到

elseif

即。删除else和if之间的空格。

Tictactoe游戏意外结束输入期待IF MySQL

1 个答案: