I have a query involving a BETWEEN statement and cannot see how to bind the parameters for it:
try {
include("../epsadmin/connectpdo.php");
$sql="SELECT * FROM properties
WHERE location LIKE :location
AND bedrooms LIKE :bedrooms
AND category LIKE :category
AND price BETWEEN :minPrice and :maxPrice
ORDER BY postcode";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':location', $_REQUEST['location'], PDO::STR);
$stmt->bindParam(':bedrooms', $_REQUEST['bedrooms'], PDO::STR);
$stmt->bindParam(':category', $_REQUEST['category'], PDO::STR);
//bindParam for price BETWEEN minPrice and MaxPrice needed
$stmt->execute();
$total = $stmt->rowCount();
$obj = $stmt->fetchObject();
}//end try
catch(PDOException $error) {
$send='DB Query failed: ' . $error->getMessage();
header("Content-type: text/plain");
echo $send;
exit;
}
Could anybody help with the required bindParam statement?
how to do the prepared statement for a query involving a BETWEEN statement
Exactly the same way as with any other query: By adding the necessary placeholders to the query and then by binding them using the bindParam method.
Related
How can a SELECT statement be run with MySqli OO using prepared statements?
I am trying to learn and I could do the INSERT, DELETE, and UPDATE statements, but I have problems with SELECT. I have been searching but I still do not understand SELECT with prepared statements (read the PHP man page for prepared statements).
Without prepared statements, it works well:
$sql = "SELECT title FROM test
WHERE id = 2";
$result = $conn->query($sql);
while($row = $result->fetch_assoc()) {
echo $row["title"] . "<br>";
}
$conn->close();
With prepared statements:
What I tried does not work.
I think I have problems with showing the data in this case. Can someone explain it please?
$stmt = $conn->prepare("SELECT title
FROM test
WHERE id = ?");
$stmt->bind_param("i", $id);
$id = 18;
$stmt->execute();
$stmt->bind_result($title);
while($stmt->fetch()) {
echo $row["title"] . "<br>";
}
$stmt->close();
$conn->close();
It makes me wonder why you weren't able make it to the end of example and started devising a syntax of your own. What do you think bind_result($title) is for? And where did you get $row from?
$stmt = $conn->prepare("SELECT title FROM test WHERE id = ?");
$stmt->bind_param("i", $id);
$id = 18;
$stmt->execute();
$stmt->bind_result($title);
while($stmt->fetch()) {
echo $title . "<br>";
}
i am using ajax to display dynamic data on my website! previously it was done using simple mysqli queries now i am improving my website's security by adding prepared statements,i have two queries one is written in mysqli and other in prepared statements here's the mysqli query
$sql = "SELECT DISTINCT model_trim FROM `tbl_02_models` WHERE model_year='$year' and model_name='$model' and model_make_id='$make' ";
$run = mysqli_query($db, $sql);
while ($row = mysqli_fetch_array($run)) {
if($row['model_trim']){
$data2[$i]['model_trim']=$row['model_trim'];
$i++;
}
}
and here's the prepared statement query
$query="SELECT DISTINCT model_trim FROM `tbl_02_models` WHERE model_year=? and model_name=? and model_make_id=?";
$stmt = $db->prepare($query);
if($stmt){
$stmt->execute();
$stmt->bind_param("iss",$year,$model,$make);
$stmt->bind_result($model_trim);
while ($stmt->fetch())
{
if($model_trim)
{
$data2[$i]['model_trim']=$model_trim;
$i++;
}
}
$stmt->close();
}
the query written in simple mysqli is working fine but when i am using the same query in prepared statements it is returning me null! any idea?
Execute method is called after bind the comments.
Try below code :
$query="SELECT DISTINCT model_trim FROM `tbl_02_models` WHERE model_year=? and model_name=? and model_make_id=?";
$stmt = $db->prepare($query);
if($stmt){
$stmt->bind_param("iss",$year,$model,$make);
$stmt->bind_result($model_trim);
$stmt->execute();
while ($stmt->fetch())
{
if($model_trim)
{
$data2[$i]['model_trim']=$model_trim;
$i++;
}
}
$stmt->close();
}
For more reference follow this link - http://www.w3schools.com/php/php_mysql_prepared_statements.asp
I've read everything there is to read about prepared statements and im still not sure about the order of execution... (many use different order).
Is this a good order ?
$sql = 'SELECT * FROM ... WHERE ... = ?';
$conn = ...connection to database...
$stmt = $conn->stmt_init();
$stmt->prepare($sql);
$stmt->bind_param('i', $param);
$stmt->execute();
$stmt->store_result(); // results are cached and accessed from memeory, therefore faster but use more memory
$num_rows = $stmt->num_rows; // how many? (can only be use with store_result() )
$stmt->bind_result($column, ...);
$stmt->fetch(); // use in loop if necessary
$stmt->free_result(); // use only with store_result()
$stmt->close(); // close prepared statement
$conn->close(); // close database
Apparently not.
Although order is quite all right, many operators you have used are superfluous and useless. Also, there should be no connection related code in the context of execution single query.
include 'db.php'; // here goes connect
$sql = 'SELECT * FROM ... WHERE ... = ?';
$stmt->prepare($sql);
$stmt->bind_param('i', $param);
$stmt->execute();
$stmt->bind_result($column, ...);
$stmt->fetch();
is enough. Note that you never need row_count if you have data.
I'm using statements to protect against sql injections... My question is what do i need to repeat when looping multiple queries?
If you look at the second query, im not sure if the prepare statement needs to be insde the foreach loop
Something wrong with this summary code?
open database connection
// connect to database
$conn = connect('r');
launch first query
$sql = "SELECT ... FROM ... WHERE xxx = ?";
$stmt = $conn->stmt_init();
$stmt->prepare($sql);
$stmt->bind_param('i', $albumid);
$stmt->bind_result(..., ...);
$stmt->execute();
$stmt->store_result();
$num_rows = $stmt->num_rows;
if ($num_rows > 0) {
loop results...
}
$stmt->free_result();
second query with repeats:
$sql = "SELECT ... FROM ... WHERE xxx = ?";
$stmt = $conn->stmt_init();
$stmt->prepare($sql); ///??????? inside or outside foreach loop ?????
foreach (... as $key => ...) {
$stmt->bind_param('i', $key);
$stmt->bind_result(...);
$stmt->execute();
$stmt->store_result();
$num_rows = $stmt->num_rows;
if ($num_rows > 0) {
loop results...
}
$stmt->free_result();
}
close database
// close database
$conn->close();
You don't have to prepare the query multiple times. Just bind the parameters and execute it multiple times.
From the PHP Manual:
For a query that you need to issue multiple times, you will realize
better performance if you prepare a PDOStatement object using
PDO::prepare() and issue the statement with multiple calls to
PDOStatement::execute().
Hope this helps.
I am pretty new to prepared statements, I am currently working through all my code to update it.
I need a bit of help rewriting the following code:
if($stmt = $db->query("select * from product where active=1 and id=?")){
echo "Returned Result";
}else{
echo "Invalid SQL";
}
Using this code I need to bind the variable $_POST['id']:
$stmt->bind_param("s", $_POST['id']);
where would I place the bind to get the whole code block to work?
thanks in advance
Instead of query() you need to call prepare():
// Prepare the statement first and bind params
$stmt = $db->prepare("select * from product where active=1 and id=?")){
$stmt->bind_param("s", $_POST['id']);
// Then execute it
if ($stmt->execute()) {
echo "Returned Result";
// Then fetch your results
} else {
echo "Query failed";
}