首先我的数据库表是这样设置的:
id | affsub | offer_name | date | time | payout
1 | stringhere | offer | 2017-09-12 | 06:47:00 | 1
我想将包含 affsub 字符串的所有行回显到 html 表中。我已经尝试过:
<?php
$id = $get_info_id;
$mysqli = new \mysqli('localhost', 'user', 'pass', 'db');
$aff = $mysqli->query("SELECT affsub FROM users WHERE id = $id")->fetch_object()->affsub;
$affsub = $aff;
$userinfo= $mysqli->query("SELECT offer_name, time, payout FROM conversions WHERE affsub = ". $affsub . "");
if ($userinfo->num_rows > 0) {
while($row = $userinfo->fetch_assoc()) {
echo '<tr>
<td><b><color=black>' .$row['offer_name'].' </b></td>
<td><color=black>' .$row['time'].'</td>
<td>$<color=black>' .$row['payout'].'</td>
</tr>';
}
}
else {
echo "<b><center>No Conversions Have Happened.</center></b>";
}
?>
我知道它正在获取 affsub，因为如果我执行 echo $affsub，我的 affsub 就会被回显，但表格上没有显示任何内容，我不确定发生了什么。
最佳答案
请注意，我使用的 sql 语句的学分属于@Barmar，因为他昨天首先想到了连接查询的想法。
现在，下面是两种可以使用的方法。请注意，我没有使用任何 OOP 或函数。原因是我希望您对所有步骤有一个紧凑的 View 。
<小时/>如何使用mysqli准备好的语句和异常处理
1。使用 get_result() + fetch_object() 或 fetch_array() 或 fetch_all():
此方法(推荐)仅在安装/激活驱动程序 mysqlnd(MySQL Native Driver)时有效。我认为该驱动程序在 PHP >= 5.3 中默认激活。实现代码并让它运行。它应该有效。如果它有效，那就完美了。如果没有，请尝试激活 mysqlnd 驱动程序，例如取消注释 php.ini 中的 extension=php_mysqli_mysqlnd.dll。否则您必须使用第二种方法(2)。
<?php
/*
* Define constants for db connection.
*/
define('MYSQL_HOST', '...');
define('MYSQL_PORT', '...');
define('MYSQL_DATABASE', '...');
define('MYSQL_CHARSET', 'utf8');
define('MYSQL_USERNAME', '...');
define('MYSQL_PASSWORD', '...');
/*
* Activate PHP error reporting.
* Use ONLY on development code, NEVER on production code!!!
* ALWAYS resolve WARNINGS and ERRORS.
* I recommend to always resolve NOTICES too.
*/
error_reporting(E_ALL);
ini_set('display_errors', 1);
/*
* Enable internal report functions. This enables the exception handling,
* e.g. mysqli will not throw PHP warnings anymore, but mysqli exceptions
* (mysqli_sql_exception). They are catched in the try-catch block.
*
* MYSQLI_REPORT_ERROR: Report errors from mysqli function calls.
* MYSQLI_REPORT_STRICT: Throw a mysqli_sql_exception for errors instead of warnings.
*
* See:
* http://php.net/manual/en/class.mysqli-driver.php
* http://php.net/manual/en/mysqli-driver.report-mode.php
* http://php.net/manual/en/mysqli.constants.php
*/
$mysqliDriver = new mysqli_driver();
$mysqliDriver->report_mode = (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
try {
// To delete (just for test here).
$get_info_id = 1;
$userId = $get_info_id;
$fetchedData = array();
/*
* Create the db connection.
*
* Throws mysqli_sql_exception.
* See: http://php.net/manual/en/mysqli.construct.php
*/
$connection = new mysqli(
MYSQL_HOST
, MYSQL_USERNAME
, MYSQL_PASSWORD
, MYSQL_DATABASE
, MYSQL_PORT
);
if ($connection->connect_error) {
throw new Exception('Connect error: ' . $connection->connect_errno . ' - ' . $connection->connect_error);
}
/*
* The SQL statement to be prepared. Notice the so-called markers,
* e.g. the "?" signs. They will be replaced later with the
* corresponding values when using mysqli_stmt::bind_param.
*
* See: http://php.net/manual/en/mysqli.prepare.php
*/
$sql = 'SELECT
cnv.offer_name,
cnv.time,
cnv.payout
FROM conversions AS cnv
LEFT JOIN users AS usr ON usr.affsub = cnv.affsub
WHERE usr.id = ?';
/*
* Prepare the SQL statement for execution.
*
* Throws mysqli_sql_exception.
* See: http://php.net/manual/en/mysqli.prepare.php
*/
$statement = $connection->prepare($sql);
if (!$statement) {
throw new Exception('Prepare error: ' . $connection->errno . ' - ' . $connection->error);
}
/*
* Bind variables for the parameter markers (?) in the
* SQL statement that was passed to mysqli::prepare. The first
* argument of mysqli_stmt::bind_param is a string that contains one
* or more characters which specify the types for the corresponding bind variables.
*
* See: http://php.net/manual/en/mysqli-stmt.bind-param.php
*/
$bound = $statement->bind_param('i', $userId);
if (!$bound) {
throw new Exception('Bind error: The variables could not be bound to the prepared statement');
}
/*
* Execute the prepared SQL statement.
* When executed any parameter markers which exist will
* automatically be replaced with the appropriate data.
*
* See: http://php.net/manual/en/mysqli-stmt.execute.php
*/
$executed = $statement->execute();
if (!$executed) {
throw new Exception('Execute error: The prepared statement could not be executed!');
}
/*
* Get the result set from the prepared statement. In case of
* failure use errno, error and/or error_list to see the error.
*
* NOTA BENE:
* Available only with mysqlnd ("MySQL Native Driver")! If this
* is not installed, then uncomment "extension=php_mysqli_mysqlnd.dll" in
* PHP config file (php.ini) and restart web server (I assume Apache) and
* mysql service. Or use the following functions instead:
* mysqli_stmt::store_result + mysqli_stmt::bind_result + mysqli_stmt::fetch.
*
* See:
* http://php.net/manual/en/mysqli-stmt.get-result.php
* https://stackoverflow.com/questions/8321096/call-to-undefined-method-mysqli-stmtget-result
*/
$result = $statement->get_result();
if (!$result) {
throw new Exception('Get result error: ' . $connection->errno . ' - ' . $connection->error);
}
/*
* Get the number of rows in the result.
*
* See: http://php.net/manual/en/mysqli-result.num-rows.php
*/
$numberOfRows = $result->num_rows;
/*
* Fetch data and save it into $fetchedData array.
*
* See: http://php.net/manual/en/mysqli-result.fetch-array.php
*/
if ($numberOfRows > 0) {
/*
* Use mysqli_result::fetch_object to fetch a row - as object -
* at a time. E.g. use it in a loop construct like 'while'.
*/
while ($row = $result->fetch_object()) {
$fetchedData[] = $row;
}
}
/*
* Free the memory associated with the result. You should
* always free your result when it is not needed anymore.
*
* See: http://php.net/manual/en/mysqli-result.free.php
*/
$result->close();
/*
* Close the prepared statement. It also deallocates the statement handle.
* If the statement has pending or unread results, it cancels them
* so that the next query can be executed.
*
* See: http://php.net/manual/en/mysqli-stmt.close.php
*/
$statementClosed = $statement->close();
if (!$statementClosed) {
throw new Exception('The prepared statement could not be closed!');
}
// Close db connection.
$connectionClosed = $connection->close();
if (!$connectionClosed) {
throw new Exception('The db connection could not be closed!');
}
} catch (mysqli_sql_exception $e) {
echo 'Error: ' . $e->getCode() . ' - ' . $e->getMessage();
exit();
} catch (Exception $e) {
echo $e->getMessage();
exit();
}
/*
* Disable internal report functions.
*
* MYSQLI_REPORT_OFF: Turns reporting off.
*
* See:
* http://php.net/manual/en/class.mysqli-driver.php
* http://php.net/manual/en/mysqli-driver.report-mode.php
* http://php.net/manual/en/mysqli.constants.php
*/
$mysqliDriver->report_mode = MYSQLI_REPORT_OFF;
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Example code: Mysqli prepared statements & exception handling</title>
</head>
<style>
table {
font-family: "Verdana", Arial, sans-serif;
font-size: 14px;
border-collapse: collapse;
}
table, th, td {
border: 1px solid #ccc;
}
th, td {
padding: 7px;
}
thead {
color: #fff;
font-weight: normal;
background-color: coral;
}
tfoot {
background-color: wheat;
}
tfoot td {
text-align: right;
}
</style>
<body>
<?php
$countOfFetchedData = count($fetchedData);
if ($countOfFetchedData > 0) {
?>
<table>
<thead>
<tr>
<th>Crt. No.</th>
<th>OFFER NAME</th>
<th>TIME</th>
<th>PAYOUT</th>
</tr>
</thead>
<tbody>
<?php
foreach ($fetchedData as $key => $item) {
$offerName = $item->offer_name;
$time = $item->time;
$payout = $item->payout;
?>
<tr>
<td><?php echo $key + 1; ?></td>
<td><?php echo $offerName; ?></td>
<td><?php echo $time; ?></td>
<td><?php echo $payout; ?></td>
</tr>
<?php
}
?>
</tbody>
<tfoot>
<tr>
<td colspan="7">
- <?php echo $countOfFetchedData; ?> records found -
</td>
</tr>
</tfoot>
</table>
<?php
} else {
?>
<span>
No records found.
</span>
<?php
}
?>
</body>
</html>
注意:如何使用 fetch_array() 而不是 fetch_object():
//...
if ($numberOfRows > 0) {
/*
* Use mysqli_result::fetch_array to fetch a row at a time.
* e.g. use it in a loop construct like 'while'.
*/
while ($row = $result->fetch_array(MYSQLI_ASSOC)) {
$fetchedData[] = $row;
}
}
//...
在 html 代码中也进行相应的更改。
注意:如何使用 fetch_all() 而不是 fetch_object():
//...
if ($numberOfRows > 0) {
/*
* Use mysqli_result::fetch_all to fetch all rows at once.
*/
$fetchedData = $result->fetch_all(MYSQLI_ASSOC);
}
//...
在 html 代码中也进行相应的更改。
2。使用store_result()+bind_result()+fetch():
无需驱动程序 mysqlnd(MySQL native 驱动程序)即可工作。
<?php
/*
* Define constants for db connection.
*/
define('MYSQL_HOST', '...');
define('MYSQL_PORT', '...');
define('MYSQL_DATABASE', '...');
define('MYSQL_CHARSET', 'utf8');
define('MYSQL_USERNAME', '...');
define('MYSQL_PASSWORD', '...');
/*
* Activate PHP error reporting.
* Use ONLY on development code, NEVER on production code!!!
* ALWAYS resolve WARNINGS and ERRORS.
* I recommend to always resolve NOTICES too.
*/
error_reporting(E_ALL);
ini_set('display_errors', 1);
/*
* Enable internal report functions. This enables the exception handling,
* e.g. mysqli will not throw PHP warnings anymore, but mysqli exceptions
* (mysqli_sql_exception). They are catched in the try-catch block.
*
* MYSQLI_REPORT_ERROR: Report errors from mysqli function calls.
* MYSQLI_REPORT_STRICT: Throw a mysqli_sql_exception for errors instead of warnings.
*
* See:
* http://php.net/manual/en/class.mysqli-driver.php
* http://php.net/manual/en/mysqli-driver.report-mode.php
* http://php.net/manual/en/mysqli.constants.php
*/
$mysqliDriver = new mysqli_driver();
$mysqliDriver->report_mode = (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
try {
// To delete (just for test here).
$get_info_id = 1;
$userId = $get_info_id;
$fetchedData = array();
/*
* Create the db connection.
*
* Throws mysqli_sql_exception.
* See: http://php.net/manual/en/mysqli.construct.php
*/
$connection = new mysqli(
MYSQL_HOST
, MYSQL_USERNAME
, MYSQL_PASSWORD
, MYSQL_DATABASE
, MYSQL_PORT
);
if ($connection->connect_error) {
throw new Exception('Connect error: ' . $connection->connect_errno . ' - ' . $connection->connect_error);
}
/*
* The SQL statement to be prepared. Notice the so-called markers,
* e.g. the "?" signs. They will be replaced later with the
* corresponding values when using mysqli_stmt::bind_param.
*
* See: http://php.net/manual/en/mysqli.prepare.php
*/
$sql = 'SELECT
cnv.offer_name,
cnv.time,
cnv.payout
FROM conversions AS cnv
LEFT JOIN users AS usr ON usr.affsub = cnv.affsub
WHERE usr.id = ?';
/*
* Prepare the SQL statement for execution.
*
* Throws mysqli_sql_exception.
* See: http://php.net/manual/en/mysqli.prepare.php
*/
$statement = $connection->prepare($sql);
if (!$statement) {
throw new Exception('Prepare error: ' . $connection->errno . ' - ' . $connection->error);
}
/*
* Bind variables for the parameter markers (?) in the
* SQL statement that was passed to mysqli::prepare. The first
* argument of mysqli_stmt::bind_param is a string that contains one
* or more characters which specify the types for the corresponding bind variables.
*
* See: http://php.net/manual/en/mysqli-stmt.bind-param.php
*/
$bound = $statement->bind_param('i', $userId);
if (!$bound) {
throw new Exception('Bind error: The variables could not be bound to the prepared statement');
}
/*
* Execute the prepared SQL statement.
* When executed any parameter markers which exist will
* automatically be replaced with the appropriate data.
*
* See: http://php.net/manual/en/mysqli-stmt.execute.php
*/
$executed = $statement->execute();
if (!$executed) {
throw new Exception('Execute error: The prepared statement could not be executed!');
}
/*
* Transfer the result set resulted from executing the prepared statement.
* E.g. store, e.g. buffer the result set into the (same) prepared statement.
*
* See:
* http://php.net/manual/en/mysqli-stmt.store-result.php
* https://stackoverflow.com/questions/8321096/call-to-undefined-method-mysqli-stmtget-result
*/
$resultStored = $statement->store_result();
if (!$resultStored) {
throw new Exception('Store result error: The result set could not be transfered');
}
/*
* Get the number of rows from the prepared statement.
*
* See: http://php.net/manual/en/mysqli-stmt.num-rows.php
*/
$numberOfRows = $statement->num_rows;
/*
* Fetch data and save it into $fetchedData array.
*
* See: http://php.net/manual/en/mysqli-result.fetch-array.php
*/
if ($numberOfRows > 0) {
/*
* Bind the result set columns to corresponding variables.
* E.g. these variables will hold the column values after fetching.
*
* See: http://php.net/manual/en/mysqli-stmt.bind-result.php
*/
$varsBound = $statement->bind_result(
$resOfferName
, $resTime
, $resPayout
);
if (!$varsBound) {
throw new Exception('Bind result error: The result set columns could not be bound to variables');
}
/*
* Fetch results from the result set (of the prepared statement) into the bound variables.
*
* See: http://php.net/manual/en/mysqli-stmt.fetch.php
*/
while ($row = $statement->fetch()) {
$fetchedObject = new stdClass();
$fetchedObject->offer_name = $resOfferName;
$fetchedObject->time = $resTime;
$fetchedObject->payout = $resPayout;
$fetchedData[] = $fetchedObject;
}
}
/*
* Frees the result memory associated with the statement,
* which was allocated by mysqli_stmt::store_result.
*
* See: http://php.net/manual/en/mysqli-stmt.store-result.php
*/
$statement->free_result();
/*
* Close the prepared statement. It also deallocates the statement handle.
* If the statement has pending or unread results, it cancels them
* so that the next query can be executed.
*
* See: http://php.net/manual/en/mysqli-stmt.close.php
*/
$statementClosed = $statement->close();
if (!$statementClosed) {
throw new Exception('The prepared statement could not be closed!');
}
// Close db connection.
$connectionClosed = $connection->close();
if (!$connectionClosed) {
throw new Exception('The db connection could not be closed!');
}
} catch (mysqli_sql_exception $e) {
echo 'Error: ' . $e->getCode() . ' - ' . $e->getMessage();
exit();
} catch (Exception $e) {
echo $e->getMessage();
exit();
}
/*
* Disable internal report functions.
*
* MYSQLI_REPORT_OFF: Turns reporting off.
*
* See:
* http://php.net/manual/en/class.mysqli-driver.php
* http://php.net/manual/en/mysqli-driver.report-mode.php
* http://php.net/manual/en/mysqli.constants.php
*/
$mysqliDriver->report_mode = MYSQLI_REPORT_OFF;
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Example code: Mysqli prepared statements & exception handling</title>
</head>
<style>
table {
font-family: "Verdana", Arial, sans-serif;
font-size: 14px;
border-collapse: collapse;
}
table, th, td {
border: 1px solid #ccc;
}
th, td {
padding: 7px;
}
thead {
color: #fff;
font-weight: normal;
background-color: coral;
}
tfoot {
background-color: wheat;
}
tfoot td {
text-align: right;
}
</style>
<body>
<?php
$countOfFetchedData = count($fetchedData);
if ($countOfFetchedData > 0) {
?>
<table>
<thead>
<tr>
<th>Crt. No.</th>
<th>OFFER NAME</th>
<th>TIME</th>
<th>PAYOUT</th>
</tr>
</thead>
<tbody>
<?php
foreach ($fetchedData as $key => $item) {
$offerName = $item->offer_name;
$time = $item->time;
$payout = $item->payout;
?>
<tr>
<td><?php echo $key + 1; ?></td>
<td><?php echo $offerName; ?></td>
<td><?php echo $time; ?></td>
<td><?php echo $payout; ?></td>
</tr>
<?php
}
?>
</tbody>
<tfoot>
<tr>
<td colspan="7">
- <?php echo $countOfFetchedData; ?> records found -
</td>
</tr>
</tfoot>
</table>
<?php
} else {
?>
<span>
No records found.
</span>
<?php
}
?>
</body>
</html>
最后，我建议您使用面向对象的方法，例如实现 MySQLiConnection 类(用于处理数据库连接)和 MySQLiAdapter 类(用于处理查询功能)。这两个类都应该只实例化一次。 MySQLiConnection 应作为构造函数参数传递给 MySQLiAdapter 类。 MySQLiAdapter 类需要 MySQLiConnection 类来查询数据库并接收结果。您也可以通过实现相应的接口(interface)来扩展它们的使用，但我试图保持简单的解释。
我还建议您使用 PDO 而不是 MySQLi。当我实现这段代码时我发现的原因之一是:MySQLi 中有些具有挑战性的异常处理系统。
祝你好运!
关于php - 如何从数据库中回显包含特定变量的行，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45092344/