Question

我的问题是我尝试连接到我的数据库（它有4个元素，ID，日期，时间和最后价值（last_value）），但我打算将我的数据输入数据库＆＃34; message_id＆＃34; element为null。任何人都可以帮助我吗？

堆栈跟踪

＆＃39; PDOException＆＃39;：带有消息的参数号无效＆＃39; SQLSTATE [HY093]：绑定变量的数量与数量不匹配令牌＆＃39;在 C：\瓦帕\ WWW \ CTEC3110 \包括\类\ cw_framework \ class.CourseWorkDatabaseWrapper.php：78 堆栈跟踪：＃0 C：\瓦帕\ WWW \ CTEC3110 \包括\类\ cw_framework \ class.CourseWorkDatabaseWrapper.php（78）： PDOStatement-＆gt; execute（）＃1 C：\瓦帕\ WWW \ CTEC3110 \包括\类\ cw_download_message_data \ class.CourseWorkDownloadMessageDataModel.php（216）： CourseWorkDatabaseWrapper-＆gt; safe_query（＆＃39; SELECT message _...＆＃39;，Array）＃2 C：\瓦帕\ WWW \ CTEC3110 \包括\类\ cw_download_message_data \ class.CourseWorkDownloadMessageDataModel.php（169）： CourseWorkDownloadMessageDataModel-＆gt; do_check_if_data_exists（）＃3 C：\瓦帕\ WWW \ CTEC3110 \包括\类\ cw_framework \ class.CourseWorkContainer.php（126）： CourseWorkDownloadMessageDataModel-＆gt; do_store_downloaded_message_data（）＃4 C：\ wamp \ www \ CTEC3110 \ includes \ classes \ cw_download_message_data \ class.CourseWorkDownloadMessageDataController.php（6）： CourseWorkCont in C：\瓦帕\ WWW \ CTEC3110 \包括\类\ cw_framework \ class.CourseWorkDatabaseWrapper.php 在第91行

检查数据是否存在代码

$m_message_id = NULL;
$m_message_date = $this->c_arr_download_message_data['message-date'];
$m_message_time = $this->c_arr_download_message_data['message-time'];
$m_message_last_value = $this->c_arr_download_message_data['message-data'];

$m_sql_query_string = CourseWorkSqlQuery::does_message_exist();

$m_arr_sql_query_parameters =
array(  ':message_id' => $m_message_id,
        ':message_date' => $m_message_date,
        ':message_time' => $m_message_time,
        ':message_last_value' => $m_message_last_value);

$this->c_obj_database_handle->safe_query($m_sql_query_string, $m_arr_sql_query_parameters);

SQL查询

public static function does_message_exist()
{
    $m_sql_query_string  = "SELECT message_id, message_time, message_date, message_last_value ";
    $m_sql_query_string .= "FROM cw_messages ";
    $m_sql_query_string .= "WHERE message_id = :message_id ";
    $m_sql_query_string .= "AND message_time = :message_time ";
    $m_sql_query_string .= "AND message_date = :message_date ";
    $m_sql_query_string .= "AND message_last_value = :message_last_value ";
    $m_sql_query_string .= "LIMIT 1";
    return $m_sql_query_string;
}

查询检查代码（在try / catch下）

$m_temp = array();
$this->c_obj_database_handle->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$this->c_obj_stmt = $this->c_obj_database_handle->prepare($m_query_string);

// bind the parameters
if (sizeof($m_arr_query_parameters) > 0)
{
    foreach ($m_arr_query_parameters as $m_param_key => $m_param_value)
    {
        $m_temp[$m_param_key] = $m_param_value;
        $this->c_obj_stmt->bindParam($m_param_key+1, $m_temp[$m_param_key], PDO::PARAM_STR);
    }
}

// execute the query
$m_execute_result = $this->c_obj_stmt->execute();
$this->c_arr_database_connection_messages['execute-OK'] = $m_execute_result;
$m_database_query_execute_error = false;

Answer 1

试试这个，因为你使用的是命名参数，所以将密钥递增1是没有意义的：

foreach ($m_arr_query_parameters as $m_param_key => $m_param_value)
{
    $this->c_obj_stmt->bindValue($m_param_key, $m_param_value);
}

＆＃39; PDOException＆＃39;：带有消息＆＃39; SQLSTATE [HY093]的参数号无效：绑定变量的数量与令牌的数量不匹配＆＃39;

1 个答案: