使用 PDO 获取单行单列 [英] Fetching single row, single column with PDO

问题描述

我有一个针对单行中单列的 mysql 查询

I have a mysql query that targets a single column in a single row

"SELECT some_col_name FROM table_name WHERE user=:user"

在我执行语句 $stmt->execute(); 之后，我如何将这个单个单元格直接放入一个没有循环的变量中?换句话说，如何获得

After I execute the statement $stmt->execute(); how do I get this single cell directly placed into a variable with no loops? In other words how to get

from $stmt->execute();

to $col_value = 100;

我尝试了下面的 2，但都没有工作.. 该列在原始表中是 4，​​但我假设因为在我的 select 语句中我只选择它，当我指定参数时它应该是 1对于 fetchColumn.

I tried the 2 below, but neither worked.. The column is number 4 in the original table, but I'm assuming since in my select statement I'm selecting it only, it should be 1 when I specify the parameter for fetchColumn.

$col_value = $stmt->fetchColumn();
$col_value = $stmt->fetchColumn(0);

如您所见，我试图用尽可能少的行来完成.

As you can see, I'm trying to do it in as few lines as possible.

推荐答案

您确定它返回任何行吗?

Are you sure it's returning any rows?

$stmt->fetchColumn()

是获取单个值的正确方法，因此您可能没有绑定 :user 参数，或者它只是不返回任何行.

is correct way to fetch a single value, so either you probably didn't bind the :user parameter or it simply returned no rows.

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