I have a simple SQL query that is not working. I have tried everything I know to fix this query, but to no avail.
$Data = $connection->prepare("SELECT * FROM EXAMPLE");
The table on the database exists, and the connection to the database is set properly.
I have also tried this:
$Data = $connection->prepare("SELECT ID FROM EXAMPLE WHERE EXAMPLE1=:EXAMPLE1 ");
$Data->execute(array(
':EXAMPLE1' => $EXAMPLE1,
));
If your connection is fine..
$Data=$connection->prepare("SELECT ID FROM EXAMPLE WHERE EXAMPLE1 = :EXAMPLE1");
$Data->execute(array(
':EXAMPLE1' => $EXAMPLE1,
));
$result = $Data->fetchAll();
Or
$result = array();
$sql = "SELECT ID FROM EXAMPLE WHERE EXAMPLE1 = {$EXAMPLE1};";
foreach ($connection->query($sql) as $row) {
$result[] = $row;
}
Related
I'm having some trouble with php coding. What I want to do is following:
Create an array ($rows) and fil it with the results of a mysqli_query ($query1) --> OK
for each element in that array, replace the value of a certain key (pilot_rule_id) with the result of another mysqli_query ($query2). (the second query will return one row, since the id of the pilot table is the primary key).
So far I have
$id = "96707ac6-ecae-11ea-878d-005056bbb446";
$rows = array();
$query1 = mysqli_query($con, "SELECT * FROM pilot_time_schedule WHERE pilot_id='$id'");
while($r = mysqli_fetch_assoc($query1)) {
$rows[] = $r;
}
foreach($rows as $pilotRuleId) {
$pilotRuleId->$pilot_rule_id;
$query2 = mysqli_query($con, "SELECT name FROM pilot_rule WHERE id='$piloteRuleId'");
while($r = mysqli_fetch_assoc($query2)) {
$result[] = $r;
}
// Don't know how to continue from here
You can something like this:
$id = "96707ac6-ecae-11ea-878d-005056bbb446";
$stmt = $con->prepare('SELECT * FROM pilot_time_schedule WHERE pilot_id=?');
$stmt->bind_param('s', $id);
$stmt->execute();
$rows = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
foreach ($rows as $row) {
$stmt = $con->prepare('SELECT name FROM pilot_rule WHERE id=?');
$stmt->bind_param('s', $row['pilot_rule_id']);
$stmt->execute();
// replace with the `name` returned from the above statement.
$row['pilot_rule_id'] = $stmt->get_result()->fetch_row()[0] ?? null;
}
However, you really should learn about SQL joins instead. Using SQL joins you can avoid N+1 queries to the database.
$id = "96707ac6-ecae-11ea-878d-005056bbb446";
$stmt = $con->prepare('SELECT pilot_time_schedule.*, pilot_rule.name
FROM pilot_time_schedule
JOIN pilot_rule ON pilot_rule.id=pilot_time_schedule.pilot_rule_id
WHERE pilot_id=?');
$stmt->bind_param('s', $id);
$stmt->execute();
$rows = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
foreach ($rows as $row) {
echo $row['name']; // contains the name from pilot_rule
}
My query is below:
$query = 'SELECT * FROM `table_name` WHERE `uid` = ? AND `email` = ?';
$stmt_select = $conn->prepare($query);
$stmt_select->bind_param('is', $user_id, $user_email);
$user_id = $_SESSION['uid'];
$user_email = $_SESSION['user_email'];
$result = $stmt_select->execute();
I want to print results set using fetch_assoc, this is because I don't want to bind_result() to all 23 columns' name, I want to print it using $row['column_name'], what is the correct way of achieving it?
If you want to see my code, I asked another question here:
How to SELECT * with multiple WHERE using fetch_assoc in prepared statements in PHP-MYSQL?
But it didn't get answered correctly, so instead of correcting my code, can you tell me what's the best way to achieve it?
I had the same issue using SELECT * in mysqli. The issue lies with the bind_result part. Normally you would need to add many variables. Meaning if you had about 20 columns, you would need 20 variables to include in the bind_result statement.
I've tailored my solution to fix your issues.
$query = 'SELECT * FROM `table_name` WHERE `uid` = ? AND `email` = ?';
$stmt_select = $conn->prepare($query);
$stmt_select->bind_param('is', $user_id, $user_email);
$user_id = $_SESSION['uid'];
$user_email = $_SESSION['user_email'];
$result = $stmt_select->execute();
$stmt_select->store_result();//after this line we can output the number of rows if you need to check that as well
$number_of_rows = $stmt_select->num_rows;
$meta = $stmt_select ->result_metadata();
$parameters = array();
$results = array();
while ($field = $meta->fetch_field()) {
$parameters[] = &$row[$field->name];
}
call_user_func_array(array($stmt_select , 'bind_result'), $parameters);
while ($stmt_select ->fetch()) {
foreach ($row as $key => $val) {
$x[$key] = $val; //here we get the key => value (Column => Value)
}
$results[] = $x; //lets grab everything here
}
print_r($results);
I am using bellow MYSQL query to delete single records from table and working perfect for me but how to write for multiple records with IN operator.
$sql = "DELETE FROM reg WHERE id = :id";
$query = $this->db->prepare($sql);
$query->execute(array(':id' => $id));
For example I have ids from array like $id = array(23,24); and I have treid with loop like bellow but not worked :(
for($i=0; $i<count($id); $i++) {
$id = $id[$i];
$sql = "DELETE FROM $table_name WHERE id = :$id";
$query = $this->db->prepare($sql);
$query->execute(array(':id' => $id));
}
I hope you understand my question and hope you will help me.
Thanks.
for($i=0; $i<count($id); $i++) {
$sql = "DELETE FROM $table_name WHERE id = :id";
$query = $this->db->prepare($sql);
$query->execute(array(':id' => $id[$i]));
}
here is my mysql code and equivalent pdo code i need to know what is wrong
$id = $_POST['id'];
$query1=mysql_query("SELECT Quantity,id FROM `yumyum`.`food` where `food`.`id` LIKE $id");
$r = array();
while($r = mysql_fetch_assoc($query1)) {
$output = $r['Quantity'];
echo $output;
$query2=mysql_query("UPDATE food SET Quantity = Quantity - 1 where `food`.`id` LIKE ".$r["id"]);
PDO code
$stmt = $db->prepare("SELECT * FROM yuymuym WHERE id=:id AND Quantity=:Quantity");
$stmt->execute(array($id, $Quantity));
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC)
How about this. I don't know what $_POST['id'] is so you have to figure the rest youself. It updates every item with id in $ids array. So this updates items with id 1,2,3,4 and 5.
$db = new PDO('mysql:host=localhost;dbname=yumyum', 'username_here', 'password_here');
$ids = array(1,2,3,4,5);
foreach($ids as $id){
$stmt = $db->prepare("SELECT Quantity, id FROM `food` WHERE `food`.`id` = :id");
$stmt->bindParam(':id', $id);
$stmt->execute();
$row = $stmt->fetch();
if($row){
//uncomment to see $row content
//var_dump($row);
$rowId = (int)$row['id'];
$rowQuantity = (int)$row['Quantity'];
echo $rowQuantity;
$ustmt = $db->prepare("UPDATE `food` SET `Quantity` = `Quantity` - 1 WHERE `food`.`id` = :id");
$ustmt->bindParam(':id',$rowId);
$ustmt->execute();
}else{
var_dump($stmt->errorInfo());
}
}
But PDO basics:
Query (Works with select, insert, update, everything else):
$id = (int)$_POST['id'];
$else = $_POST['string'];
// Connect to database
$db = new PDO('mysql:host=HOST_HERE;dbname=DATABASENAME_HERE', 'USERNAME_HERE', 'PASSWORD_HERE');
// First we prepare our query
$stmt = $db->prepare("... WHERE `id` = :id AND `something` = :else");
// We bind values to our prepared query
$stmt->bindParam(':id',$id);
$stmt->bindParam(':else',$else);
// We execute our query
$success = $stmt->execute();
// If we want to fetch only one row:
$row = $stmt->fetch();
echo $row['id'];
// If we want to fetch all rows:
$rows = $stmt->fetchAll();
foreach($rows as $row){
echo $row['id'];
}
These are very basics, if you don't understand what is really happening here, you should learn some more.
I've an issue with a migration from a drupal 6 to 7 website. I'm a beginner in PHP and MySQL and I can't find a solution to my problem.
The code I'm struggling with is following:
$sql = "select ID_Speler from TB_Spelers where uid = ".$id;
$row = db_fetch_array(db_query($sql));
$speler = $row['ID_Speler'];
I always get a "Call to undefined function db_fetch_array()"
Any help is very much appreciated.
Use this in Drupal 7:
$query = db_select('field_data_field_order_no', 'fdfon');
$query->addField('fdfon', 'entity_id', 'nid');
$query->addField('fdfnt', 'field_notification_type_value', 'type');
$query->join('field_data_field_notification_type', 'fdfnt', 'fdfon.entity_id = fdfnt.entity_id AND (fdfon.bundle = :fdfon_bundle AND fdfnt.bundle = :fdfnt_bundle)', array(':fdfon_bundle' => "order_notification_type", ':fdfnt_bundle' => "order_notification_type"));
$query->condition('fdfon.field_order_no_value', $order_id)->orderBy('fdfnt.entity_id', 'asc');
$result = $query->execute();
while ($records = $result->fetchAssoc()) {
...
}
There's no db_fetch_array() in Drupal 7, the (almost) equivalent code would be
$sql = "select ID_Speler from TB_Spelers where uid = :uid";
$args = array(':uid' => $uid);
$row = db_query($sql, $args)->fetchObject();
$speler = $row->ID_Speler;
See the Database API docs for more info.
Try like that:
$sql = "select ID_Speler from TB_Spelers where uid = %d";
$query = db_query($sql, $id);
while ($records = db_fetch_array($query)) {
$spelers[] = $records['ID_Speler'];
}
print_r($spelers);