问题
I have a page as shown in the screenshot below. The idea is to enter the bus number and the list of all stops on a particular route, one per line.
The stops are already stored in a database table called 'stops' I need the ID of each stop from the textarea. My current code only gets the ID of the last stop in the textarea. I feel like I am missing something. 'busnumber' is my textfield and 'busroute' is my textarea. I would appreciate if anyone can point me out on what I need to change in order to get the ID of each stop entered in the textarea as an array. Thanks for your time in advance.
try {
$conn = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
if(isset($_POST["busnumber"]) && isset($_POST["busroute"])){
$stops = explode(PHP_EOL, $_POST["busroute"]);
$stopsArray = '"' . implode('","', $stops) . '"';
$sql = "SELECT * FROM stops WHERE stop_name IN ($stopsArray)";
echo $sql."</br>";
$query = $conn->prepare($sql);
$query->execute();
$query->setFetchMode(PDO::FETCH_ASSOC);
$results = $query->fetchAll();
foreach($results as $result){
echo $result['stop_id'].' '.$result['stop_name'].'</br>';
}
}
} catch (PDOException $pe) {
die("Could not connect to the database $dbname :" . $pe->getMessage());
}
UPDATE 1 I changed the code as follows
$conn = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
if(isset($_POST["busnumber"], $_POST["busroute"])){
$stops = explode(PHP_EOL, $_POST["busroute"]);
foreach($stops as $stop){
$sql = "SELECT * FROM stops WHERE stop_name = '".$stop."'";
$statement = $conn->query($sql);
echo $sql.'</br>';
$statement->setFetchMode(PDO::FETCH_ASSOC);
$results = $statement->fetchAll();
foreach($results as $result){
echo $result['stop_id'].' '.$result['stop_name'];
}
$statement = null;
}
}
and still get the same output, it only gives me the ID of the last item inside the textarea
回答1:
I just realized that you have working code displayed above. I'm sorry for giving answers before (see history if ya want) that are already there above (*haha). Here, I've updated the code of yours (the first one). I changed the part where you display the result:
try {
$conn = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
if(isset($_POST["busnumber"]) && isset($_POST["busroute"])){
$stops = explode(PHP_EOL, $_POST["busroute"]);
$stopsArray = '"' . implode('","', $stops) . '"';
$sql = "SELECT * FROM stops WHERE stop_name IN ($stopsArray)";
$query = $conn->prepare($sql);
$query->execute();
if ($query->rowCount() > 0){
while ($row = $query->fetch(PDO::FETCH_ASSOC)){
echo '<br/>'.$row['stop_id'].' '.$row['stop_name'];
}
}else{
echo "No records found...";
}
}
} catch (PDOException $pe) {
die("Could not connect to the database $dbname :" . $pe->getMessage());
}
Note: As I have read some tutorials, using while loop is conventional than fetchAll().
回答2:
Your db structure could help to give you a more precise info. Since it is lacking, I am going to speculate over it a little just to give you an idea.
Each bus (route) has several stops. That means there must be a foreign key defined in stops table and it points to route table.
In order to select all stops from stops table on a given route, what you need to do is to modify your select statement as follows:
Semantic code
SELECT * from stops where stops.routeId = <aGivenRouteId>
or
SELECT * from stops where stops.routeId in (an Array Of Route IDs)
Keep in mind that second form is slower.
I hope it makes sense to you.
__UPDATE__
If this is the case, there might be a many to many relationship. If this is the case, look for another table which connects stops and routes. That table should contain just route_id and stop_id in order to associate them to each other. From that table, you can select stop_ids on a given route, and then from stops table you can get names of the stops.
Hope it helps.
__UPDATE2__
Oh I see. You may need to modify your screen a bit. Something like this:
+Add Route-----------------------------------------+
|Bus Number |
|__________ |
| |
|Stops In This Route All Stops |
+--------------------------+-+--+------------------+
|Stop 2 |x| |Stop 1 |
|Stop 5 |x| |Stop 2 |
|Stop 9 |x|<<|Stop 3 |
| | |Stop 4 V|
+--------------------------+-+--+------------------+
|Add Route |
+----------------------------+--+------------------+
In All Stops part, you can show all the stops in DB (in your stops table). For stops in this route part, I suggest you to create another table where you associate stops and routes, basically a table containing stop_id and route_id.
Would it work for you this way?
回答3:
I FIXED THE ERROR. The solution for anyone out there is simple, the PHP explode function was used to split the contents of a textarea into separate lines but it doesn't work if you use explode() with PHP_EOL. PHP EOL tells you the server's newline character from what I understand. I used the preg_split instead to perform the splitting and it works on both my localhost that runs on Windows and my server that runs on Linux. Thank you everyone for your help!!!
$conn = new PDO("mysql:host=$host;dbname=$db;charset=$charset", $user, $pass);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
if(isset($_POST["busnumber"], $_POST["busroute"])){
$stops = preg_split("/\\r\\n|\\r|\\n/", $_POST['busroute']);
$sql = 'SELECT * FROM stops WHERE stop_name LIKE :stop';
$statement = $conn->prepare($sql);
foreach($stops as $stop){
$statement->bindValue(':stop', $stop);
$statement->execute();
while($result = $statement->fetch()){
echo $result['stop_id'].' '.$result['stop_name'].'</br>';
}
}
}
回答4:
$conn = new PDO("mysql:host=$host;dbname=$db;charset=$charset",$user,$pass);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
if(isset($_POST["busnumber"], $_POST["busroute"]))
{
$stops = preg_split("/\\r\\n|\\r|\\n/$_POST['busroute']);
$sql = 'SELECT * FROM stops WHERE stop_name LIKE :stop';
$statement = $conn->prepare($sql);
foreach($stops as $stop){
$statement->bindValue(':stop', $stop);
$statement->execute();
while($result = $statement->fetch())
{
echo $result['stop_id'].' '.$result['stop_name'].'</br>';
}
}
来源：https://stackoverflow.com/questions/37560463/php-mysql-pdo-textarea-where-clause-with-condition-checks