Question

我对“未知”专栏有疑问。这是我在萤火虫中找回的错误。

错误：SQLSTATE [42S22]：未找到列：1054“where子句”中的未知列“admin”UPDATE用户SET session_key = 1234567890 WHERE username ='admin'

这是参数和调用语句

$ table ='users';

$ fields_vals = array（'session_key'=＆gt; $ session_key）;

$ where = array（'username'=＆gt; $ username）;

$ dbResult = $ this-＆gt; DB-＆gt; sql_update（$ fields_vals，$ table，$ where）;

/*
     * UPDATE
     * $data -> assoc array containing (field => value) to be UPDATED.
     * $where -> Where clause (only a single argument)
     * $table -> to be updated
*/

 public function sql_update($fieldsVals, $table, $where)
    {
        try {
            //Values to be updated in in a assoc array
            //Extract values and fields and concatenate with '=' ( field = value )
            $upd_string = '';
            foreach($fieldsVals as $name => $value){
                $upd_string .= $name .' = :'. $name .' ,';
            }
            //Trim last comma that was appended
            $upd_string = rtrim($upd_string, ',');

            // Formulate the where clause
            $where_str = '';
            foreach($where as $wName => $wValue){
                $where_str .= "$wName = $wValue";
            }



              //Set Query
                //$query = "UPDATE {$table} SET {$upd_string} WHERE $where_str";

              // THIS IS WHERE I EXPLICITLY RAN THE QUERY, BUT GOT EXACTLY THE SAME ERROR.
                $query = "UPDATE users SET session_key = 1234567890 WHERE username = 'admin'";
                $stmt = $this->conn->prepare($query);

            //Exec
            foreach($fieldsVals as $k => &$v){
                $stmt->bindParam(":{$k}", $v);
            }
            $stmt->execute();
            return true;

        } catch(PDOException $e) {
            echo 'ERROR: ' . $e->getMessage();
            return false;
        }
    }

以下是该列确实存在的证据。 enter image description here

请注意 - ＆gt;其中username ='admin'

Answer 1

尝试将WHERE属性作为准备好的变量传递：

$query = "UPDATE users SET session_key = 1234567890 WHERE username = :username";
$fieldsVals[":username"] = "admin";

Answer 2

            $where_str .= "$wName = '$wValue'";

否则，您的查询将显示为＆＃34; WHERE username = admin＆＃34;

Answer 3

正确的用法是：

$stmt = $this->conn->prepare('UPDATE users SET session_key = :session WHERE username = :username');
$stmt->bindParam(':session', session_id(), PDO::PARAM_STR);
$stmt->bindParam(':username', $username, PDO::PARAM_STR);

然后执行。

我认为你的变量$fieldsVals是错误的，因为你做的是foreach。也许你偶然切换键和val，导致WHERE admin=username。

更新

@MarcinNabiałek当然你错过了引号。

但似乎错误来自脚本的不同部分。

Answer 4

您应该如何为整个查询使用预准备语句，因此您应该将当前函数更改为：

function sql_update($fieldsVals, $table, $where)
{

    //Values to be updated in in a assoc array
    //Extract values and fields and concatenate with '=' ( field = value )
    $upd_string = '';
    foreach ($fieldsVals as $name => $value) {
        $upd_string .= $name . ' = :set_' . $name . ' ,';
    }
    //Trim last comma that was appended
    $upd_string = rtrim($upd_string, ',');

    // Formulate the where clause
    $where_str = '';
    foreach ($where as $wName => $wValue) {
        $where_str .= $wName . ' = :wh_' . $wName . ' ,';

    }
    //Trim last comma that was appended
    $where_str = rtrim($where_str, ',');


    //Set Query
    $query = "UPDATE {$table} SET {$upd_string} WHERE $where_str";


    $stmt = $this->conn->prepare($query);

    //Exec
    foreach ($fieldsVals as $k => &$v) {
        $stmt->bindParam(":set_{$k}", $v);
    }
    foreach ($where as $k => &$v) {
        $stmt->bindParam(":wh_{$k}", $v);
    }
    $stmt->execute();
    return true;

}

Answer 5

您的查询似乎没有在PHP中使用'。您要么不使用它，要么使用看起来相似的其他符号。

如果我在phpmyAdmin查询中运行：

UPDATE users SET session_key = 1234567890 WHERE username = admin

我也收到错误消息：

#1054 - Unknown column 'admin' in 'where clause'

但是当我有

时

UPDATE users SET session_key = 1234567890 WHERE username = 'admin'

一切正常

在您的代码中，您应该明确更改：

$where_str .= "$wName = $wValue";

到

$where_str .= "$wName = '$wValue'";

Answer 6

session_key是varchar

您必须使用如下所示的查询

$query = "UPDATE users SET session_key = '1234567890' WHERE username = 'admin'";

Answer 7

列admin不存在！虽然列administrator存在。

我在您提供的屏幕截图中的mysql表中没有看到任何管理列。

您只需将mysql表中administrator列的名称更改为admin即可，一切正常。

PHP和PDO准备好的语句 - 未找到列

7 个答案: