Php 触发器在不应该触发的情况下引发消息

我在一个表上附加了一个触发器，当某些列的组合不是唯一的时，它应该引发异常

CREATE TRIGGER uniqueness BEFORE INSERT ON a
  BEGIN
    SELECT RAISE(FAIL, 'Record is not unique !')
    FROM a
    WHERE ((NEW.st <> 1) 
      AND (p = NEW.p)
      AND ((name = NEW.name) OR (safe_name = NEW.safe_name)));
  END;

显然，当排序规则thingy处于活动状态时，foo5名称等于foo5

如果删除sqliteCreateCollation调用和COLLATE NS语句，它将正常工作：/

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是否有任何解决方案允许我保留排序功能？我只需要它来排序，但显然它也用于比较…

您已经专门设置了排序规则来进行不区分大小写的比较。尝试将其更改为：

$pdo->sqliteCreateCollation('NS', 'strnatcmp');

---

然后看看这是否有帮助。

您应该能够保留排序规则，但仅在触发器查询时将其切换为二进制

$pdo = new PDO('sqlite::memory:');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);      
$pdo->sqliteCreateCollation('NS', 'strnatcasecmp');      

$pdo->query('CREATE TABLE a(
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   st INTEGER NOT NULL,
   p  INTEGER NOT NULL,
   name TEXT NOT NULL COLLATE NS,
   safe_name NOT NULL COLLATE NS)');

$pdo->query('CREATE TRIGGER uniqueness BEFORE INSERT ON a
  BEGIN
    SELECT RAISE(FAIL, "Record is not unique !")
    FROM a
    WHERE ((NEW.st <> 1) 
      AND (p = NEW.p)
      AND ((name COLLATE BINARY = NEW.name) OR (safe_name COLLATE BINARY = NEW.safe_name)));
  END;');

// success
$pdo->query('INSERT INTO a(st, p, name, safe_name) VALUES(2, 2, "Foo 5", "foo-5")');

// should work now
$pdo->query('INSERT INTO a(st, p, name, safe_name) VALUES(2, 2, "foo  5", "foo5")');

---

您可以发布表def和一些意外抛出的示例数据吗？您是否尝试显式命名列，如a.safe_name=NEW.safe_name？我的猜测是，SELECT中除safe_name之外的条件是匹配的。我添加了更多详细信息。我不能这样做，因为我需要对排序结果进行不区分大小写的比较。但我不知道为什么sqlite在选择x=y时使用它。这没有意义…COLLATE BINARY是默认的排序规则吗？谢谢！我从create table中删除了COLLATE语句，并将COLLATE NS添加到要使用自然排序的查询中的ORDER BY语句中。似乎有效

$pdo = new PDO('sqlite::memory:');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);      
$pdo->sqliteCreateCollation('NS', 'strnatcasecmp');      

$pdo->query('CREATE TABLE a(
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   st INTEGER NOT NULL,
   p  INTEGER NOT NULL,
   name TEXT NOT NULL COLLATE NS,
   safe_name NOT NULL COLLATE NS)');

$pdo->query('CREATE TRIGGER uniqueness BEFORE INSERT ON a
  BEGIN
    SELECT RAISE(FAIL, "Record is not unique !")
    FROM a
    WHERE ((NEW.st <> 1) 
      AND (p = NEW.p)
      AND ((name COLLATE BINARY = NEW.name) OR (safe_name COLLATE BINARY = NEW.safe_name)));
  END;');

// success
$pdo->query('INSERT INTO a(st, p, name, safe_name) VALUES(2, 2, "Foo 5", "foo-5")');

// should work now
$pdo->query('INSERT INTO a(st, p, name, safe_name) VALUES(2, 2, "foo  5", "foo5")');