I want to get a single value(aktiv) out of a table called wartung.
include('blog/includes/db_connect.php');
$query = $db->prepare("SELECT * FROM wartung");
$query->execute();
$query->bind_result($wartung_id, $aktiv, $grund);
The value of aktiv in the database is 1.
but this code doesn't get this 1 into the $aktiv variable.
PS: I'm not used to code with MySQL and PHP so if there is a beginner-bug please don't be mad.
Try:
include('blog/includes/db_connect.php');
$query = $db->prepare("SELECT aktiv FROM wartung");// I am assuming your column is named aktiv
$query->execute();
$query->bind_result($aktiv);
$query->fetch();
You are not fetching the value
include('blog/includes/db_connect.php');
$query = $db->prepare("SELECT * FROM wartung");
$query->execute();
$query->bind_result($wartung_id, $aktiv, $grund);
$query->fetch();
Related
Following a tutorial, I execute SQL queries using PHP like so:
$query = $pdo -> prepare("SELECT id FROM Families WHERE family_name = ?");
$query -> bindValue(1, $family_name);
$query -> execute();
$query2 = $pdo -> prepare("SELECT * FROM Categories WHERE family_id = ?");
$query2 -> bindValue(1, $query); //ISSUE IN THIS LINE
$query2 -> execute();
My question: How do I take the result of the first query, the id, and put it as input in the second query?
You need to fetch the result, execute only runs the query in db, it does not get the values, try this which will return an array:
$result = $query->fetchAll();
If you know you only want one result, try:
$result = $query->fetch();
store the first query result in an object like
$result = $query->execute();
if ($result && $result->num_rows > 0)
{
$family = $Result->fetch_object();
$query2 = $pdo -> prepare("SELECT * FROM Categories WHERE family_id = ?");
$query2 -> bindValue(1, $family->id);
$query2 -> execute();
}
Please use limit 1 so that object don't return more than one id
$stmt1 = $pdo->prepare("SELECT id FROM Families WHERE family_name = ?");
$stmt1->bindValue(1, $family_name);
$stmt1->execute();
$family = $stmt1->fetch(PDO::FETCH_OBJ); //You can use fetch inorder to return 1 result for more use fetchAll();
//Here $family is now an object array
//Stored id in $family_id variable
$family_id = $family->family_id; //All the columns will save as properties now so you can easily access each of them
$stmt2 = $pdo->prepare("SELECT * FROM Categories WHERE family_id = ?");
$stmt2->bindValue(1, $family_id);
$stmt2->execute();
$stmt2->fetchAll(PDO::FETCH_OBJ); //Used fetchAll method because It's returning more than 1 result I guess
Try combining the Queries:
SELECT f.* FROM Families INNER JOIN Categories c on c.id = f.family_id WHERE c.family_name = ?
Fetch the result as Mohsen Nazari has stated
i'm trying to retrieve info from my database using PDO.
The code i'm using is
$input = $_GET['input'];
$inputvalue = $_GET['inputvalue'];
$db = DB::get_instance();
$query = $db->prepare('SELECT * FROM hwidex7 WHERE :input=:inputvalue');
$query->bindParam(':inputvalue', $inputvalue);
$query->bindParam(':input', $input);
$query->execute();
You can't bind table or column as parameter in PDO
You can build your query as
$query = $db->prepare("SELECT * FROM hwidex7 WHERE `$input` =:inputvalue");
$query->bindParam(':inputvalue', $inputvalue);
$query->execute();
$result = $query->fetch(PDO::FETCH_ASSOC);
print_r($result);
Both ways are wrong.
SELECT * FROM hwidex7 WHERE `HWID`='3087793810'
Just try above query.
You will get Idea for same.
I want to change MySQL to PDO:
$mapa = mysql_fetch_array(mysql_query("select * from mapa where id = ".$postac['mapa']." limit 1"));
$mapa_d = mysql_query("select * from mapa_d where mapa = ".$mapa['id']." ");
PHP:
$_SESSION['postac'] = $_POST['postac'];
try like this so far:
$stmt = $pdo->prepare("SELECT * FROM mapa WHERE id=:mapa");
$stmt->bindValue(':mapa', $postac, PDO::PARAM_STR);
$stmt->EXECUTE();
$postac = $stmt->fetchAll(PDO::FETCH_ASSOC);
mysql update:
mysql_query("update postac set logged = 1 where id = ".$_SESSION['postac']." limit 1");
PDO:
$stmt = $pdo->prepare("update postac set logged = 1 where id:postac");
$stmt->bindValue(':postac', $_SESSION, PDO::PARAM_STR);
$stmt->EXECUTE();
$_SESSION = $stmt->fetchAll(PDO::FETCH_ASSOC);
Does not work.
Pre-Answer Note:
I assume you have already set up a PDO connection construct ($pdo) before trying to run your PDO queries.
$mapa = mysql_fetch_array(
mysql_query("select * from mapa WHERE id = ".$postac['mapa']." limit 1"));
$mapa_d = mysql_query("select * from mapa_d WHERE mapa = ".$mapa['id']." ");
PHP:
$_SESSION['postac'] = $_POST['postac'];
try like this so far:
$stmt = $pdo->prepare("SELECT * FROM mapa WHERE id=:mapa");
$stmt->bindValue(':mapa', $postac, PDO::PARAM_STR);
$stmt->EXECUTE();
$postac = $stmt->fetchAll(PDO::FETCH_ASSOC);
PART 1:
Be Consistent
Your original statement uses a value $postac['mapa'] as an id reference in the MySQL_ query, but then your PDO statement you are passing the whole array as a value into the PDO query.
First, MySQL: id ==> $postac['mapa']
Second, PDO: id ==> $postac
So this is causing an immediate issue as you're passing a whole array in to PDO which is somehow expected to extract one value from this array. This array is being classed as a string with your PDO::PARAM_STR declaration so this is preventing the query from using this value, as it doesn't fit what it's told to expect.
Therefore this returns a NULL query.
So to fix it,
$stmt = $pdo->prepare("SELECT * FROM mapa WHERE id=:mapa");
$stmt->bindValue(':mapa', $postac['mapa'], PDO::PARAM_STR);
$stmt->execute();
$postac = $stmt->fetchAll(PDO::FETCH_ASSOC);
Part 2:
Syntax
$stmt = $pdo->prepare("update postac set logged = 1 where id:postac");
$stmt->bindValue(':postac', $_SESSION, PDO::PARAM_STR);
$stmt->EXECUTE();
$_SESSION = $stmt->fetchAll(PDO::FETCH_ASSOC);
As above, you're passing the whole $_SESSION array as a PARAM_STR value, so it's returning VOID /NULL. You also have a syntax fault that you're using WHERE id:postac, but you really mean WHERE id = :postac be careful of missing out syntax such as = !!.
PART 3:
Error Checking
It is well worth exploring and learning how to get useful error feedback on PHP PDO, as it will save you posting to StackOverfow X times a day (hopefully!)!
There is a good answer here about how to setup PDO to output errors. It is also well worth browsing the PHP Manual for PDO error checking details.
I have numbers stored in my MySQL (paid). I need to SUM the columns.
$sql= "SELECT SUM(furniture) FROM paid";
$stmt = $connect->prepare($sql);
$stmt->execute();
$furniture = (int) $stmt->fetchColumn();
$sql= "SELECT SUM(groceries) FROM paid";
$stmt = $connect->prepare($sql);
$stmt->execute();
$groceries = (int) $stmt->fetchColumn();
//so on....
There are morthan 50 columns in the database. My question is, Is there a shorter way to write this so I can get the SUM for each column and assign it to a variable?
Try with single query
$sql = "SELECT SUM(`furniture`) AS sumFurniture,
SUM(`groceries`) AS sumGroceries ,
...
FROM `paid` ";
result can be get with
$sth = $connect->prepare($sql);
$sth->execute();
$result = $sth->fetch();
$sumFurniture = $result['sumFurniture'];
$sumGroceries = $result['sumGroceries'];
....
You can combine them as a Single SQL Query
SELECT SUM(furniture) AS furniture, SUM(groceries) AS groceries....... FROM paid
If your where clause is same you can combine the query like this:
select sum(<column_name1>) column_name1,sum(<column_name2>) column_name2 from tablename where <where>
From php, you can fetch it: using array index "column_name1","column_name2"
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 />";
}