When I use the following code, it returns nothing - no errors, no values. When I want to select just one specific row and display that data, using fetch() works fine. But the moment I put it in a loop to get multiple rows, nothing happens. Here is the code I am using:
$stmt = $pdo->prepare("SELECT name FROM company WHERE position = :position AND branch = :branch ORDER BY name ASC");
$position = 23;
$branch = "Management";
$stmt->bindParam(':position', $position, PDO::PARAM_INT);
$stmt->bindParam(':branch', $branch, PDO::PARAM_STR);
$stmt->execute();
while ($row = $stmt->fetch()) {
echo $row['name'];
}
Related
I am trying to fetch user
function getItemName($dbh, $userId) {
$itemId = getItemId($dbh, $userId); // the getItemId() function works
echo "item id is: " . $itemId ; // because I can see the correct result if I echo it
$sql = "SELECT name FROM items WHERE id = :item_id";
$stm = $dbh->prepare($sql);
$stm->bindParam(':item_id', $itemId, PDO::PARAM_INT);
$stm->execute();
$result = $stm->fetch();
return $result['name'];
}
And I get Trying to access array offset on value of type bool on the return $result['name']; line.
The field name exists on the items table so that's not the issue.
Also, when I try to further test it, I change the $sql statement to SELECT * FROM items and then when I do echo $stm->rowCount() it finds the correct number of rows (With the original SQL statement row count is 0)
Can't find out what's causing this
I have 3 suggestions:
Make sure to convert $itemId to integer using intval();
Just before returning the function result validate that the query returned results.
$result = $stm->fetch();
if(!$result){
return null;
}
return $result['name'];
Finally, the more obvious, make sure the itemId you are looking for exists in the DB.
Ive used two queried in a function. FIrst query to find an array of data. And second query is to select rows as per checking the array data from the first query. But the overall function return only one row data.
function getCartItems($conn)
{
$cust_id=$_SESSION['cust_id'];
$stmtSelect1 = $conn->prepare("SELECT product_id FROM tbl_cart WHERE cust_id=cust_id");
$stmtSelect1->bindParam('cust_id',$cust_id);
$stmtSelect1->execute();
$product_id= $stmtSelect1->fetchAll();
foreach($product_id as $productid) {
$stmtfetch = $conn->prepare("SELECT * FROM tbl_item WHERE product_id=:products_id");
$stmtfetch->bindParam(':products_id',$productid['product_id']);
$stmtfetch->execute();
$datas = $stmtfetch->fetchAll();
print_r($datas);
exit();
}
}
First of all, your code has typos (Missing ":" before parameter, product_id/products_id).
This should work:
$cust_id=$_SESSION['cust_id'];
$stmt = $conn->prepare("SELECT tbl_item.* FROM tbl_cart, tbl_item WHERE tbl_cart.cust_id = :cust_id AND tbl_item.product_id = tbl_cart.product_id);
$stmt->bindParam('cust_id',$cust_id);
$stmt->execute();
$rows = $stmt->fetchAll();
foreach($rows as $row)
{
print_r($row);
}
this is my code where i have problem, here i am not getting any result for stmt2 fetch data,
$result = $user_hash_conn->query($q1);
if($result->num_rows > 0){
$stmt = $store_conn->prepare('SELECT `location`,`institute`, `category`, `sub_category`, `date`,`title`, `message` FROM `pre_demand_by_key` WHERE `key`=?');
$stmt->bind_param("s",$key);
# for no of match found
$stmt2 = $store_conn->stmt_init();
$stmt2 = $store_conn->prepare('SELECT `key` FROM `store_list` WHERE `location`=? AND `institute` LIKE ? AND `category`=? AND `sub_category` LIKE ?');
while($row = $result->fetch_assoc()){
$key = $row['varchar_128'];
$stmt->execute();
$stmt->bind_result($location,$institute,$category,$sub_category,$date,$title,$message);
while($stmt->fetch()){
#no of match found
$location2 = $location;
$institute2 = $institute."%";
$category2 = $category;
$sub_category2 = $sub_category."%";
$stmt2->bind_param("ssss",$location2,$institute2,$category2,$sub_category2);
$stmt2->execute();
$stmt2->bind_result($item_key2);
echo $stmt2->error;
$item_keys = [];
while($stmt2->fetch()){
echo $item_key2;
}
}
}
}
i have record in my table for my second stmt, but here i doesn't give my any result all my code is correctly written(mean i didn't have spelling mistake related to db or tb name), when i manually check it on phpmyadmin it responsed with some result. Please help me. i am struggling with my code for last 4-5 hours
Super new to PHP here, only using PHP to create my json data and having a hard time to understand the syntax. Here is some partial code:
All I am trying to do is to retrieve the value '2af8ddda-2be4-11e5-9453-b82a72d52c35' and put it in variable #sharepointID:
function selectWithSharepointID($table, $columns, $where){
try{
//Get Sharepoint file ID first
$stmt = $this->db->prepare("SELECT ID FROM table1 ORDER BY DownloadedTimeStamp DESC LIMIT 1");
$stmt->execute();
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
//$data[] = array("ID" => $rows['ID']);
//$sharepointID = $data[0];
//$sharepointID = $rows[0];
$where = array('id'=>$sharepointID);
//$where = array('id'=>'2af8ddda-2be4-11e5-9453-b82a72d52c35'); //this works fine
...
PS: also tried to use print_r and echo but cant see anything in the console.
Thank you
You don't need to fetchAll if you only have one record. Try:
$stmt = $this->db->prepare("SELECT ID FROM table1 ORDER BY DownloadedTimeStamp DESC LIMIT 1");
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_ASSOC);
$sharepointID = $row['ID'];
If you have multiple records the fetchAll makes sense but then you iterate through that to get each row, and its values.
For a rough example where I'd use fetchAll...
$stmt = $this->db->prepare("SELECT name, userid FROM users");
$stmt->execute();
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
foreach($rows as $row){
echo 'Name: ' . $row['name'] . ' userid :' . $row['id'];
}
This expression returns array of rows:
$stmt->fetchAll(PDO::FETCH_ASSOC);
So, you can get data from row 0 in your case:
$sharepointID = $rows[0]['ID'];
I'm in the process of updating my old mysql database techniques to prepared pdo statements. I'm all good with while loops while($row = $result->fetch()) however how would I do the following with PDO prepared statements?
$sql = "SELECT * FROM table WHERE id=".$id;
$result = mysql_query($sql) or die(mysql_error());
$loop_count = mysql_num_rows($result);
for($row=0;$row<7 && $loop_count-->0;$row++)
{
// Get next row
$loop_row = mysql_fetch_array($result);
echo $loop_row['field'];
}
I've tried this but with no joy:
$result = $conn->prepare("SELECT * FROM table WHERE id= ?");
$result->execute(array($id));
$loop_count = $result->rowCount();
for($row=0;$row<7 && $loop_count-->0;$row++)
{
// Get next row
$loop_row = $result->fetch();
echo $loop_row['field'];
}
Thanks!
UPDATE: The reason for using a for loop instead of a while loop is the ability to paginate the results, otherwise I would just put LIMIT 7 on the end of the SQL query.
To properly count rows with PDO you have to do this -
$result = $conn->prepare("SELECT * FROM table WHERE id= ?");
$result->execute(array($id));
$rows = $result->fetch(PDO::FETCH_NUM);
echo $rows[0];
But you would be better off using LIMIT in your query if all you want to do is get a static number of results.
In addition you're making your loop overly complex, there is no need to test for a range in the for condition just set the static number unless you're doing something weird, like possibly pagination.
You can try it this way:
$result = $conn->prepare("SELECT * FROM table WHERE id= ?");
$result->execute(array($id));
$loop_rows = $result->fetchAll();
$loop_count = count($loop_rows);
for($row=0;$row<7 && $loop_count-->0;$row++)
{
// Get next row
echo $loop_rows[$row]['field'];
}
As requested by the OP, here's an example of PDO prepared statements using LIMIT and OFFSET for pagination purposes. Please note i prefer to use bindValue() rather than passing parameters to execute(), but this is personal preference.
$pagesize = 7; //put this into a configuration file
$pagenumber = 3; // NOTE: ZERO BASED. First page is nr. 0.
//You get this from the $_REQUEST (aka: GET or POST)
$result = $conn->prepare("SELECT *
FROM table
WHERE id= :id
LIMIT :pagesize
OFFSET :offset");
$result->bindValue(':id', $id);
$result->bindValue(':pagesize', $pagesize);
$result->bindValue(':offset', $pagesize * $pagenumber);
$result->execute();
$rows = $result->fetchAll(PDO::FETCH_ASSOC);
This gives you the complete resultset of rows, limited to your required page. You need another query to calculate the total number of rows, of course.
What you could try is:
//Get your page number for example 2
$pagenum = 2;
//Calculate the offset
$offset = 7 * $pagenum;
//Create array
$data = array();
$result = $conn->prepare("SELECT * FROM table WHERE id= ? LIMIT 7 OFFSET ?");
$result->bind_param("ii", $id,$offset);
$result->execute();
$resultSet = $result->get_result();
while ($item = $resultSet->fetch_assoc())
{
$data[] = $item;
}
$result->close();
//echo resultSet you want
var_dump($data);