我从没想过我会在这么简单的任务中绊倒，我正在做的是从MySQL获取行，并在表单上显示它们，然后用户可以根据需要更新值：
<?php
include('includes/db_connection.php');
include('includes/sessions.php');
include('includes/functions.php');
include('includes/header.php');
include('includes/navbar-logged.php');
// AUTHENTICATION //
$row = DB::getInstance()->selectOneByField('membership', 'member_username', $member);
if ($row['member_user_class'] != 'Site Administrator') {
stderr("Sorry, <b>no authorization</b> to access this page.");
}
// AUTHENTICATION //
// CLOUD KEYS //
if (isset($_POST['submitCloudKeys']))
{
// TRY/CATCH //
try {
foreach ($_POST['cloudId'] as $val) {
DB::getInstance()->update(
'clouds',
'cloud_id',
$val,
[
'cloud_key' => $_POST['cloud_key'][$val]
]);
stdmsg('Cloud keys \'<b>'.$_POST['cloud_key'][$val].'</b>\' have been <b>updated</b>.');
}
} catch (Exception $e) {
stderr($e);
}
}
$rows = DB::getInstance()->select('SELECT * FROM `clouds`');
?>
<div class="panel panel-primary">
<div class="panel-heading">Current cloud hosts.</div>
<div class="panel-body">
<form action="clouds.php" method="post" class="form-horizontal container-fluid" role="form">
<?php $x = 0; ?>
<?php $z = 0; ?>
<?php foreach ($rows as $row) { ?>
<div class="row form-group">
<div class="col-sm-4 text-right"><label for="txtNetwork" class="control-label"><?php echo htmlspecialchars($row['cloud_name']) ?>:</div>
<div class="col-sm-8">
<input type="text" name="cloud_key[]" value="<?php echo htmlspecialchars($row['cloud_key']) ?>" size="30" class="form-control" />
<input type="hidden" name="cloudId[]" value="<?php echo $row['cloud_id']; ?>" />
</div>
</div>
<?php } ?>
<div class="row form-group">
<div class="col-sm-12 text-right">
<button type="submit" name="submitCloudKeys" class="btn btn-default">Update</button>
</div>
</div>
</form>
</div>
<div class="panel-footer">Update the <b>cloud hosts</b> keys.</div>
</div>
<?php
include('includes/footer.php');
我收到了一个错误：
PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'b447297ddb6be7377......................' in 'field list' in /home/admin/web/wraithpbns.com/public_html/includes/DB.php:268
Stack trace: #0 /home/admin/web/wraithpbns.com/public_html/includes/DB.php(268): PDOStatement->execute()
#1 /home/admin/web/wraithpbns.com/public_html/clouds.php(26): DB->update('clouds', 'cloud_id', '1', Array)
#2 {main}
MySQL中的表名都是正确的，我不明白为什么我无法更新表单值，“未知列”部分显示我正在尝试更新的关键值，我有从来没有遇到过这个问题，任何帮助都会受到赞赏！
更新的方法：
<?php
class DB
{
private static $instance;
public static function getInstance() {
if(is_null(self::$instance)) {
self::$instance = new DB();
}
return self::$instance;
}
public static function map(array $rows = array(), $keyColumn, $valueColumn = null) {
$result = array();
foreach($rows as $row) {
if(is_null($valueColumn)) {
$result[$row[$keyColumn]] = $row;
} else {
$result[$row[$keyColumn]] = $row[$valueColumn];
}
}
return $result;
}
private $pdo;
private function __construct() {
try {
$this->pdo = new PDO(
sprintf('%s:host=%s;dbname=%s',
DRIVER,
HOST,
DATA
),
USER,
PASS,
array(
PDO::ATTR_PERSISTENT => true,
PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8; SET CHARACTER SET utf8;'
)
);
} catch(Exception $ex) {
throw new Exception('Cannot connect to database.');
}
}
public function execute($query, array $params = []) {
$normParams = $this->normalizeParams($params);
$command = $this->pdo->prepare($query);
$command->closeCursor();
$status = $command->execute($normParams);
if(!$status) {
throw new Exception('DB::execute(): Can\'t execute query:');
}
return $status;
}
public function select($query, array $params = [], $fetchType = PDO::FETCH_ASSOC) {
$normParams = $this->normalizeParams($params);
$command = $this->pdo->prepare($query);
$command->closeCursor();
foreach($normParams as $paramName => $paramValue) {
if(is_array($paramValue)
&& isset($paramValue['type'])
&& isset($paramValue['value'])) {
$command->bindValue($paramName, $paramValue['value'], $paramValue['type']);
} else {
$command->bindValue($paramName, $paramValue);
}
}
if(!$command->execute()) {
throw new Exception('DB::select(): Can\'t execute query.');
}
return $command->fetchAll($fetchType);
}
public function selectValues($query, array $params = [], $fetchType = PDO::FETCH_ASSOC) {
$row = $this->selectOne($query, $params, $fetchType);
if(empty($row)) {
throw new Exception('DB::selectValues(): No values selected.');
} else {
return $row;
}
}
public function selectValue($query, array $params = []) {
$values = $this->selectValues($query, $params, PDO::FETCH_NUM);
return $values[0];
}
public function selectAll($tableName, $fetchType = PDO::FETCH_ASSOC) {
return $this->select(
sprintf('
SELECT *
FROM `%s`',
$tableName
),
[],
$fetchType
);
}
public function selectByField($tableName, $fieldName, $value, $fetchType = PDO::FETCH_ASSOC) {
return $this->select(
sprintf('
SELECT *
FROM `%s`
WHERE `%s` = :value',
$tableName,
$fieldName
),
[
':value' => $value
],
$fetchType
);
}
public function selectOne($query, array $params = [], $fetchType = PDO::FETCH_ASSOC) {
$rows = $this->select($query, $params, $fetchType);
return array_shift($rows);
}
public function selectOneByField($tableName, $fieldName, $value, $fetchType = PDO::FETCH_ASSOC) {
$rows = $this->selectByField($tableName, $fieldName, $value, $fetchType);
return array_shift($rows);
}
public function get($tableName, $fieldName, $value, $fetchType = PDO::FETCH_ASSOC) {
return $this->selectOneByField($tableName, $fieldName, $value, $fetchType);
}
public function insert($tableName, array $fields) {
$normParams = $this->normalizeParams($fields);
$paramNames = implode(', ', array_keys($normParams));
$fieldNames = '`' . implode('`, `', array_keys($fields)) . '`';
$command = $this->pdo->prepare(
sprintf('
INSERT INTO `%s` (%s)
VALUES (%s)',
$tableName,
$fieldNames,
$paramNames
)
);
$command->closeCursor();
if(!$command->execute($normParams)) {
throw new Exception('DB::insert(): Can\'t execute query.');
}
return $this->pdo->lastInsertId();
}
public function bulkInsert($tableName, array $rows = []) {
if(empty($rows)) {
return;
}
$fieldNames = array_keys($this->normalizeParams($rows[0]));
$normParams = [];
$paramNames = '';
$counter = 0;
foreach($rows as $row) {
$paramNames .= ((0 < $counter)? ',': '') . '(';
$nextParamNames = [];
foreach($row as $paramKey => $paramValue) {
$nextParamNames[] = ':' . $paramKey . $counter;
$normParams[':' . $paramKey . $counter] = $paramValue;
}
$paramNames .= implode(',', $nextParamNames);
$paramNames .= ')';
$counter++;
}
$command = $this->pdo->prepare(
sprintf('
INSERT INTO `%s` %s
VALUES %s',
$tableName,
$fieldNames,
$paramNames
)
);
$command->closeCursor();
if(!$command->execute($normParams)) {
throw new Exception('DB::bulkInsert(): Can\'t execute query.');
}
}
public function update($tableName, $fieldName, $fieldValue, array $updateFields, $updateAll = false) {
if(is_null($fieldName)) {
if(!$updateAll) {
throw new SystemException('Attempt to update all table records without confirmation.');
}
$sqlWhere = '';
} else {
$sqlWhere = sprintf('WHERE `%s` = %s', $fieldName, $fieldValue);
}
// echo $sqlWhere;
//
// exit;
$normUpdateFields = $this->normalizeParams($updateFields);
$sqlSetRows = [];
foreach($updateFields as $updateFieldName => $updateFieldValue) {
$sqlSetRows[] = sprintf('`%s` = %s', $updateFieldName, $updateFieldValue);
}
$sqlSet = implode(', ', $sqlSetRows);
$command = $this->pdo->prepare(
$sql = sprintf('
UPDATE `%s`
SET %s
%s',
$tableName,
$sqlSet,
$sqlWhere
)
);
$command->closeCursor();
foreach($normUpdateFields as $updateFieldName => $updateFieldValue) {
if(is_array($updateFieldValue)
&& isset($updateFieldValue['type'])
&& isset($updateFieldValue['value'])) {
$command->bindValue($updateFieldName, $updateFieldValue['value'], $updateFieldValue['type']);
} else {
$command->bindValue($updateFieldName, $updateFieldValue);
}
}
if(!empty($sqlWhere)) {
$command->bindValue(':' . $fieldName, $fieldValue);
}
if(!$command->execute()) {
throw new Exception('DB::update(): Can\'t execute query.');
}
}
public function remove($tableName, $fieldName = null, $value = null, $removeAll = false) {
$isExecuted = false;
if(is_null($fieldName)
&& is_null($value)
&& $removeAll) {
$isExecuted = $this->execute(sprintf('DELETE FROM `%s`', $tableName));
} else if(!is_null($fieldName)
&& !is_null($value)) {
$isExecuted = $this->execute(
sprintf('
DELETE FROM `%s`
WHERE `%s` = :value',
$tableName,
$fieldName
),
[
':value' => $value
]
);
}
if(!$isExecuted) {
throw new Exception('DB::remove(): Can\'t execute query.');
}
}
protected function normalizeParams(array $params = []) {
$normParams = [];
foreach($params as $paramKey => $paramValue) {
$normParams[(strlen($paramKey) && (':' === $paramKey{0}))? $paramKey: ':' . $paramKey] = $paramValue;
}
return $normParams;
}
/**
* Replaces any parameter placeholders in a query with the value of that
* parameter. Useful for debugging. Assumes anonymous parameters from
* $params are are in the same order as specified in $query
*
* @param string $query The sql query with parameter placeholders
* @param array $params The array of substitution parameters
* @return string The interpolated query
*/
public function interpolateQuery($query, $params) {
$keys = array();
# build a regular expression for each parameter
foreach ($params as $key => $value) {
if (is_string($key)) {
$keys[] = '/:'.$key.'/';
} else {
$keys[] = '/[?]/';
}
}
$query = preg_replace($keys, $params, $query, 1, $count);
#trigger_error('replaced '.$count.' keys');
return $query;
}
}
答案 0 :(得分：1)
您的更新方法中存在逻辑问题，
首先，您要分配一个值，然后尝试绑定一个值，
$sqlWhere = sprintf('WHERE `%s` = %s', $fieldName, $fieldValue);
// ^^ ^^^^^^^^^^^^
和你的set子句相同：
$sqlSetRows[] = sprintf('`%s` = %s', $updateFieldName, $updateFieldValue);
// ^^ ^^^^^^^^^^^^^^^^^^
然后正如我所说的那样，无论是在where子句中，您都试图使用bindValue再次绑定这些值：
$command->bindValue(':' . $fieldName, $fieldValue);
或在你的循环中：
foreach($normUpdateFields as $updateFieldName => $updateFieldValue) {
....
$command->bindValue($updateFieldName, $updateFieldValue);
解决你有两种方法：
1）通过传递写密钥来解决此问题：
$sqlWhere = sprintf('WHERE `%s` = :%s', $fieldName, $fieldName);
和你的set子句：
$sqlSetRows[] = sprintf('`%s` = :%s', $updateFieldName, $updateFieldName);
2）直接注入这些值并保留bindValue方法，这是不可取的：
$sqlSetRows[] = sprintf('`%s`="%s"', $updateFieldName, $updateFieldValue);
和$sqlWhere = sprintf('WHERE％s ="%s"', $fieldName, $fieldValue);