我在创建触发器时遇到一些问题，因为我必须声明一些变量，然后使用它们进行一些更新操作。无论如何，我要粘贴代码，以及它抛出的错误，希望有人会告诉我我做错了什么。感谢。
CREATE TRIGGER trg_league_info
AFTER UPDATE ON matchs
BEGIN
DECLARE HomeTotalMatchCount ,HomeWinMatchCount ,HomeDrawMatchCount ,HomeLossMatchCount ,HomeLeagueScore ,HomeAgainstGoal ,HomeForGoal ,HomeAverage INT DEFAULT 0;
DECLARE AwayTotalMatchCount ,AwayWinMatchCount ,AwayDrawMatchCount ,AwayLossMatchCount ,AwayLeagueScore ,AwayAgainstGoal ,AwayForGoal ,AwayAverage INT DEFAULT 0;
DECLARE HomeTeamID ,AwayTeamID ,HomeScore ,AwayScore ,SeasonID ,Status INT DEFAULT 0;
SELECT @HomeTeamID=HomeID, @AwayTeamID=AwayID , @HomeScore=HomeScore , @AwayScore=AwayScore ,@SeasonID=SeasonID , @Status=Status FROM inserted;
IF (@Status == 2) THEN
SELECT @HomeTotalMatchCount=LeagueTotalMatchCount , @HomeWinMatchCount=LeagueWinCount , @HomeDrawMatchCount=LeagueDrawCount , @HomeLossMatchCount=LeagueLossCount , @HomeAgainstGoal=LeagueAgaintsGoalCount , @HomeForGoal=LeagueForGoalCount , @HomeAverage= LeagueAvarage , @HomeLeagueScore = LeagueScore FROM team_info WHERE TeamID == @HomeTeamID AND SeasonID==@SeasonID;
SELECT @AwayTotalMatchCount=LeagueTotalMatchCount , @AwayWinMatchCount=LeagueWinCount , @AwayDrawMatchCount=LeagueDrawCount , @AwayLossMatchCount=LeagueLossCount , @AwayAgainstGoal=LeagueAgaintsGoalCount , @AwayForGoal=LeagueForGoalCount , @AwayAverage= LeagueAvarage , @AwayLeagueScore = LeagueScore FROM team_info WHERE TeamID == @AwayTeamID AND SeasonID==@SeasonID;
IF (@HomeScore>@AwayScore) THEN
uPDATE team_info SET LeagueTotalMatchCount=@HomeTotalMatchCount+1 ,LeagueWinCount=@HomeWinMatchCount+1, LeagueAgaintsGoalCount=@HomeAgainstGoal+@AwayScore , LeagueForGoalCount=@HomeForGoal+@HomeScore, LeagueScore=@HomeLeagueScore+3 WHERE TeamID == @HomeTeamID AND SeasonID==@SeasonID;
uPDATE team_info SET LeagueTotalMatchCount=@AwayTotalMatchCount+1 ,LeagueLossCount=@AwayLossMatchCount+1, LeagueAgaintsGoalCount=@AwayAgainstGoal+@HomeScore , LeagueForGoalCount=@AwayForGoal+@AwayScore, LeagueScore=@AwayLeagueScore+1 WHERE TeamID == @AwayTeamID AND SeasonID==@SeasonID;
ELSEIF (@HomeScore==@AwayScore) THEN
uPDATE team_info SET LeagueTotalMatchCount=@HomeTotalMatchCount+1 ,LeagueDrawCount=@HomeDrawMatchCount+1, LeagueAgaintsGoalCount=@HomeAgainstGoal+@AwayScore , LeagueForGoalCount=@HomeForGoal+@HomeScore, LeagueScore=@HomeLeagueScore+2 WHERE TeamID == @HomeTeamID AND SeasonID==@SeasonID;
uPDATE team_info SET LeagueTotalMatchCount=@AwayTotalMatchCount+1 ,LeagueDrawCount=@AwayDrawMatchCount+1, LeagueAgaintsGoalCount=@AwayAgainstGoal+@HomeScore , LeagueForGoalCount=@AwayForGoal+@AwayScore, LeagueScore=@AwayLeagueScore+2 WHERE TeamID == @AwayTeamID AND SeasonID==@SeasonID;
ELSE
uPDATE team_info SET LeagueTotalMatchCount=@HomeTotalMatchCount+1 ,LeagueLossCount=@HomeLossMatchCount+1, LeagueAgaintsGoalCount=@HomeAgainstGoal+@AwayScore , LeagueForGoalCount=@HomeForGoal+@HomeScore, LeagueScore=@HomeLeagueScore+1 WHERE TeamID == @HomeTeamID AND SeasonID==@SeasonID;
uPDATE team_info SET LeagueTotalMatchCount=@AwayTotalMatchCount+1 ,LeagueWinCount=@AwayWinMatchCount+1, LeagueAgaintsGoalCount=@AwayAgainstGoal+@HomeScore , LeagueForGoalCount=@AwayForGoal+@AwayScore, LeagueScore=@AwayLeagueScore+3 WHERE TeamID == @AwayTeamID AND SeasonID==@SeasonID;
END IF;
END IF;
END
它会抛出以下错误：
上次我写了一个触发器，我在MSSQL Server中做了它，语法有点不同。也许我只需要创建一个程序并调用它。如果有人可以提供帮助，我会很感激。
答案 0 :(得分：0)
您使用错误的语法进行触发。检查manual，您必须添加UIAlertController * alert= [UIAlertController
alertControllerWithTitle:[[[NSBundle mainBundle] infoDictionary]
objectForKey:@"CFBundleDisplayName"]
message:@"share via"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* fbButton = [UIAlertAction
actionWithTitle:@"Facebook"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
// Add your code
}];
UIAlertAction* twitterButton = [UIAlertAction
actionWithTitle:@"Twitter"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
// Add your code
}];
UIAlertAction* watsappButton = [UIAlertAction
actionWithTitle:@"Whatsapp"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
// Add your code
}];
UIAlertAction* emailButton = [UIAlertAction
actionWithTitle:@"Email"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
// Add your code
}];
UIAlertAction* cancelButton = [UIAlertAction
actionWithTitle:@"Cancel"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
//Handel no, thanks button
}];
[alert addAction:fbButton];
[alert addAction:twitterButton];
[alert addAction:watsappButton];
[alert addAction:emailButton];
[alert addAction:cancelButton];
[self presentViewController:alert animated:YES completion:nil];
构造。像这样：
FOR EACH ROW另外，请注意您要声明变量，但不使用它们。 CREATE TRIGGER trg_league_info
AFTER UPDATE ON matchs
FOR EACH ROW
BEGIN
...
END;
和HomeTotalMatchCount是MySQL中的不同变量。您的@HomeTotalMatchCount变量是此触发器的本地变量，只能在其中访问。但是以HomeTotalMatchCount为前缀的变量是用户变量，它们存储在会话中，可以在当前连接中的任何位置访问。它们将在执行触发器后持续存在。您必须删除声明并使用用户变量或从变量名中删除@并使用本地声明的变量。