I was wondering if it possible to use multiple query this way? that will make my work easy or any other way to do this? just moved on to mysqli prepared statement so no idea. thanks you
$mysqli = new mysqli('localhost', 'root', '', 'demo');
$stmt = $mysqli -> prepare("SELECT * FROM users WHERE id = ?");
$stmt->bind_param('i', $id);
$stmt->execute();
$stmt = $stmt->get_result();
while ($row = $stmt->fetch_assoc()) {
//do something with row
}
$stmt->bind_param('i', $id2);
$stmt->execute();
$stmt = $stmt->get_result();
while ($row = $stmt->fetch_assoc()) {
//do something with row
}
$stmt = $stmt->get_result()
returns mysqli_result and it isn't prepared statement anymore, and as such you cannot do multiple queries.
You cannot use "multiple query" with prepared statements. However, you can execute the same query with different set of parameters - that's exactly what prepared statements are for. Judging by your code, you need the second option (so I corrected the question title). All you need is to supply another value for the already bound variable.
here you go:
$mysqli = new mysqli('localhost', 'root', '', 'demo');
$stmt = $mysqli -> prepare("SELECT * FROM users WHERE id = ?");
$stmt->bind_param('i', $id);
$stmt->execute();
$res = $stmt->get_result();
while ($row = $res->fetch_assoc()) {
//do something with row
}
$id = $id2; // you need to use the same variable you bound
$stmt->execute();
$res = $stmt->get_result();
while ($row = $res->fetch_assoc()) {
//do something with row
}
oh and yes, there was also a silly typo in your code, now fixed. You shouldn't overwrite the statement variable.
Related
I always find it difficult to write MySQLi prepared statements, because many functions work differently than in the old way. Right now I am facing a problem regarding fetch_array().
$stmt = $db->prepare("SELECT category_id FROM post_items Where user_id = ?");
$stmt->bind_param('i', $userid);
$result = $stmt->execute();
while ($row = $result->fetch_array()) {
// ...
}
you are trying to fetch the results by
$result = $stmt->execute();
which is not the case. as execute will return you only a boolean value.
do it like.
$stmt = $db->prepare("SELECT category_id FROM post_items Where user_id = ?");
$stmt->bind_param('i', $userid);
$stmt->execute();
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
//result is in row
}
$stmt->execute(); doesn't return result. You need $stmt->get_result();.
You can rewrite your code like this:
$stmt = $db->prepare("SELECT category_id FROM post_items Where user_id = ?");
$stmt->bind_param('i', $userid);
$stmt->execute();
$result = $stmt->get_result();
foreach($result as $row) {
// ...
}
replace this:
$result = $stmt->execute();
while ($row = $result->fetch_array()) {
by this
$stmt->bind_result($category_id);
while($stmt->fetch()){
$myArray=$category_id;
}
I use fetch_array(MYSQLI_ASSOC) with query but it doesn't work with prepared statements. What is the equivalent of that in prepared statements?
Here it is:
$query = "SELECT `users` FROM `table` WHERE `country` = :country";
$stmt = $pdo->prepare($query);
$stmt->execute(array(
':country' => $country
));
$result = $stmt->fetch(PDO::FETCH_ASSOC); // Here you define how results are fetched
or you can define default FETCH MODE to be an associate array, like this:
$pdo = new PDO(...);
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$result = $stmt->fetch(); // The same thing now
In addition to the accepted PDO solution, here is one for mysqli:
The first thing to keep in mind is that mysqli prepared statements do not require results to be bound:
Instead of using bound results, results can also be retrieved through the mysqli_result interface. mysqli_stmt_get_result() returns a buffered result set.
So, for example:
$sql = 'SELECT * FROM mytable ORDER BY column LIMIT ?,' . SOME_CONSTANT;
Once you have bound and executed your statement, you can call get_result():
$stmt = $db->prepare($sql);
$stmt->bind_param('i', $int) || die($db->error);
$stmt->execute() || die($db->error);
$result = $stmt->get_result();
At this point we are functionally equivalent to:
if ($result = $db->query($sql)) {
And can call our familiar fetch_array:
while ($row = $result->fetch_array(MYSQLI_ASSOC)) {
$results[] = $row;
}
Instead of closing the result as we would in the non-prepared equivalent, we close the statement:
$stmt->close();
trying to convert all my old mysql_* operations into new and, from what i've heard, improved PDO, but this query wont seem to run successfully, I am trying to select all from the table PEOPLE where the username = $username (which has previously been declared $username = $_SESSION['username'];)
$query = "SELECT * FROM people WHERE username=?";
$stmt = $conn->prepare($query);
$stmt->bindParam(1, $username);
$stmt->execute();
$num_rows = $stmt->fetchColumn();
if ($num_rows == 1) {
// ...
}
THE WORKING CODE IS:
$query = "SELECT * FROM people
WHERE username=?";
$stmt = $conn->prepare($query);
$stmt->bindParam(1, $username);
$stmt->execute();
$num_rows = $stmt->fetchColumn();
$user = $stmt->fetchObject();
if ($user) {
//do something
}
$stmt->fetchColumn does not fetch the number of rows; in this case it will fetch the first column from the first row of the result set. Since that will not be equal to 1 generally your test will fail.
In this case there is also no real need to count the number of returned rows because you are expecting either one or zero (if the username does not exist). So you can simply do:
$stmt->execute();
$user = $stmt->fetchObject();
if (!$user) {
// not found
}
else {
echo "User $user->username found!";
}
The if(!$user) test works because if there is no row to fetch $user will be false (see the documentation for fetchObject).
$query = "SELECT * FROM people WHERE username = :username";
$stmt = $conn->prepare($query);
$stmt->bindParam(':username', $username);
$stmt->execute();
while ($row = $stmt->fetchObject()) {
// do stuff
}
Use PDOStatement::rowCount as the num_rows and PDOStatement::fetch(PDO::FETCH_ASSOC) as fetch_assoc equivalent.
You want
if ($stmt->num_rows == 1) {
instead.
I have this sequence of code:
$connection = new mysqli('localhost','root','','db-name');
$query = "SELECT * from users where Id = ?";
$stmt = $connection->prepare($query);
$stmt->bind_param("i",$id);
$stmt->execute();
$stmt->bind_result($this->id,$this->cols);
$stmt->fetch();
$stmt->close();
$connection->close();
The problem is that the "SELECT" might give a variable number of columns, which i retain in $this->cols. Is there any possibility to use bind_result with a variable number of parameters?...or any alternative to the solution.
if you are lucky enough to run PHP 5.3+, mysqli_get_result seems what you want.
$stmt->execute();
$result = $stmt->get_result();
$row = $result->fetch_array();
I've tried following the PHP.net instructions for doing SELECT queries but I am not sure the best way to go about doing this.
I would like to use a parameterized SELECT query, if possible, to return the ID in a table where the name field matches the parameter. This should return one ID because it will be unique.
I would then like to use that ID for an INSERT into another table, so I will need to determine if it was successful or not.
I also read that you can prepare the queries for reuse but I wasn't sure how this helps.
You select data like this:
$db = new PDO("...");
$statement = $db->prepare("select id from some_table where name = :name");
$statement->execute(array(':name' => "Jimbo"));
$row = $statement->fetch(); // Use fetchAll() if you want all results, or just iterate over the statement, since it implements Iterator
You insert in the same way:
$statement = $db->prepare("insert into some_other_table (some_id) values (:some_id)");
$statement->execute(array(':some_id' => $row['id']));
I recommend that you configure PDO to throw exceptions upon error. You would then get a PDOException if any of the queries fail - No need to check explicitly. To turn on exceptions, call this just after you've created the $db object:
$db = new PDO("...");
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
I've been working with PDO lately and the answer above is completely right, but I just wanted to document that the following works as well.
$nametosearch = "Tobias";
$conn = new PDO("server", "username", "password");
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sth = $conn->prepare("SELECT `id` from `tablename` WHERE `name` = :name");
$sth->bindParam(':name', $nametosearch);
// Or sth->bindParam(':name', $_POST['namefromform']); depending on application
$sth->execute();
You can use the bindParam or bindValue methods to help prepare your statement.
It makes things more clear on first sight instead of doing $check->execute(array(':name' => $name)); Especially if you are binding multiple values/variables.
Check the clear, easy to read example below:
$q = $db->prepare("SELECT id FROM table WHERE forename = :forename and surname = :surname LIMIT 1");
$q->bindValue(':forename', 'Joe');
$q->bindValue(':surname', 'Bloggs');
$q->execute();
if ($q->rowCount() > 0){
$check = $q->fetch(PDO::FETCH_ASSOC);
$row_id = $check['id'];
// do something
}
If you are expecting multiple rows remove the LIMIT 1 and change the fetch method into fetchAll:
$q = $db->prepare("SELECT id FROM table WHERE forename = :forename and surname = :surname");// removed limit 1
$q->bindValue(':forename', 'Joe');
$q->bindValue(':surname', 'Bloggs');
$q->execute();
if ($q->rowCount() > 0){
$check = $q->fetchAll(PDO::FETCH_ASSOC);
//$check will now hold an array of returned rows.
//let's say we need the second result, i.e. index of 1
$row_id = $check[1]['id'];
// do something
}
A litle bit complete answer is here with all ready for use:
$sql = "SELECT `username` FROM `users` WHERE `id` = :id";
$q = $dbh->prepare($sql);
$q->execute(array(':id' => "4"));
$done= $q->fetch();
echo $done[0];
Here $dbh is PDO db connecter, and based on id from table users we've get the username using fetch();
I hope this help someone, Enjoy!
Method 1:USE PDO query method
$stmt = $db->query('SELECT id FROM Employee where name ="'.$name.'"');
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);
Getting Row Count
$stmt = $db->query('SELECT id FROM Employee where name ="'.$name.'"');
$row_count = $stmt->rowCount();
echo $row_count.' rows selected';
Method 2: Statements With Parameters
$stmt = $db->prepare("SELECT id FROM Employee WHERE name=?");
$stmt->execute(array($name));
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
Method 3:Bind parameters
$stmt = $db->prepare("SELECT id FROM Employee WHERE name=?");
$stmt->bindValue(1, $name, PDO::PARAM_STR);
$stmt->execute();
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
**bind with named parameters**
$stmt = $db->prepare("SELECT id FROM Employee WHERE name=:name");
$stmt->bindValue(':name', $name, PDO::PARAM_STR);
$stmt->execute();
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
or
$stmt = $db->prepare("SELECT id FROM Employee WHERE name=:name");
$stmt->execute(array(':name' => $name));
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
Want to know more look at this link
if you are using inline coding in single page and not using oops than go with this full example, it will sure help
//connect to the db
$dbh = new PDO('mysql:host=localhost;dbname=mydb', dbuser, dbpw);
//build the query
$query="SELECT field1, field2
FROM ubertable
WHERE field1 > 6969";
//execute the query
$data = $dbh->query($query);
//convert result resource to array
$result = $data->fetchAll(PDO::FETCH_ASSOC);
//view the entire array (for testing)
print_r($result);
//display array elements
foreach($result as $output) {
echo output[field1] . " " . output[field1] . "<br />";
}