Question

当我使用fetchAll将整个列放入数组时，我的代码会获取前两列并将这些列放入数组中。但是，当我尝试使用最后的第三列时，它会给我一个空白数组，我的代码如下所示。

 <?php

$host="localhost"; // Host name 
$username="root"; // Mysql username 
$password=""; // Mysql password 
$db_name="test"; // Database name 
$tbl_name="test"; // Table name 

// Connect to server and select databse.
$con = new PDO('mysql:host=localhost;dbname=test', $username, $password );
// username and password sent from form 

$sth = $con->prepare("SELECT range   FROM test");
$sth->execute();

/* Fetch all of the remaining rows in the result set */
print("Fetch all of the remaining rows in the result set:\n");
$result = $sth->fetchAll();
print_r($result);
?>

现在当我们更换范围而不是nr时，我得到这个输出

Fetch all of the remaining rows in the result set: Array ( [0] => Array ( [nr] => 1 [0] => 1 ) [1] => Array ( [nr] => 2 [0] => 2 ) [2] => Array ( [nr] => 3 [0] => 3 ) [3] => Array ( [nr] => 4 [0] => 4 ) )

然而，当我们离开范围时，我们得到了

Fetch all of the remaining rows in the result set: Array ( )

Answer 1

SELECT nr FROM test的工作原因和SELECT range FROM test之所以不是因为range是MySQL中的reserved keyword。用反引号（`）围绕它，以便在列名中使用保留关键字：

SELECT `range` FROM test
//     ^     ^ Nessesary when using reserved keywords

PDO fetchAll不会获取最后一列

1 个答案: