Asked  2 Years ago    Answers:  5   Viewed   335 times

I'm using this code and I'm beyond frustration:

try {
    $dbh = new PDO('mysql:dbname=' . DB . ';host=' . HOST, USER, PASS);
    $dbh->setAttribute(PDO::MYSQL_ATTR_INIT_COMMAND, "SET NAMES 'utf8'");
catch(PDOException $e)
$stmt = $dbh->prepare('INSERT INTO table(v1, v2, ...) VALUES(:v1, :v2, ...)');
$stmt->bindParam(':v1', PDO::PARAM_NULL); // --> Here's the problem

PDO::PARAM_NULL, null, '', all of them fail and throw this error:

Fatal error: Cannot pass parameter 2 by reference in /opt/...



You need to use bindValue, not bindParam

bindParam takes a variable by reference, and doesn't pull in a value at the time of calling bindParam. I found this in a comment on the PHP docs:

bindValue(':param', null, PDO::PARAM_INT);

P.S. You may be tempted to do this bindValue(':param', null, PDO::PARAM_NULL); but it did not work for everybody (thank you Will Shaver for reporting.)

Saturday, November 5, 2022

I think that you want:

INSERT INTO Contacts (id,group_id,company_id,email,name)
FROM company co
LEFT JOIN contacts c ON = c.company_id
WHERE c.company_id IS NULL

This will insert all the information from contacts in company that wasn't already there. the column phone will be left null, since there is no information in contacts for that column.

Tuesday, November 22, 2022

It expects the second paramter to be a variable which can be passed by reference. Assuming $stmt1is a PDO statement then, as the docs for bindparam say

Unlike PDOStatement::bindValue(), the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called.

Your second param is an expression ($_SESSION['quantity'.$i] * $_SESSION['price'.$i]) not a variable. Since you appear to want to evaluate the exptression now, I guess you should used bindValue() instead.

Tuesday, December 6, 2022

If you use PDO::exec() the return value will be 1 if the row has been inserted and 2 if the row has been updated.

If you're using a prepared statement and PDOStatement::execute() the same is true for PDOStatement::rowCount()

Tuesday, November 1, 2022

I don't know why this happen (and I would still prefer to have that answer), but it looks like the aspnet_compiler tool does not know where to find the System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider type without explicit instructions in the web.config file. The build routine inside of VS 2010 somehow knows, and I do not understand why aspnet_compiler does not do the same!

Thursday, November 10, 2022
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