Question

我知道这可能是一个有点奇怪的问题，但基本上就是这样：

public static void main(String[] args) throws IOException //Alternatively, you should probably handle this.
{
    //I don't know what your source is for the search strings,
    //but this will simulate them.
    String[] toSearch = {"Strings", "to", "search", "for."};
    //Simplest way to read a file when no editing is needed.
    for (String line : Files.readAllLines(FileSystems.getDefault().getPath("input.txt")))
    {
        for (String str : toSearch)
        {
            //Simplest way to check if one String contains another.
            if (line.contains(str))
            {
                System.out.println("Yup!");
                //Now that we know the file contains a String, no need to continue.
                return;
            }
        }
    }
    //If it even gets to this point, it got through the file with no match.
    System.out.println("Fail!");
}

我想更问题的问题是，在回滚/提交时是否必须存在$pdo->beginTransaction(); $stmt = $pdo->prepare('...'); $stmt->bindValue(':something', $something); if (!$stmt->execute()) { $pdo->rollBack(); } $stmt = null; $stmt = $pdo->prepare('...'); $stmt->bindValue(':something', $something); if (!$stmt->execute()) { $pdo->rollBack(); } $stmt = null; $pdo->commit();，还是纯粹在数据库级别执行回滚，这并不重要。

对此的一些随机失败可归因于$stmt清除gc之前的语句吗？此外，如果没有后一次回滚，情况是否会发生变化 - 即如果第二次声明失败不构成rollBack？

注意！我希望在较低的层面上理解这个过程。我完全清楚这些语句可以在单独的变量中，并在事务提交后清理。：）

PDO语句可以在事务中被清除吗？

0 个答案: