在PHP PDO中绑定参数

Question

I am trying to create a dynamic query builder.

I have two bits of code.

The first bit, creates the PDO object (I know this works) and then runs the search function in my querybuilder.

include 'core/database/dbloader.php';
$domainName = "lomcn.org";

$query = new dbquery(Connection::make($dbconfig['domainhistory']));
$query->search('dns','domain',$domainName);

The search function is -

public function search($table,$field,$domainName)
{
    $statement = $this->pdo->prepare("SELECT * FROM {$table} WHERE {$field} LIKE :domain");
    $statement->bindParam(":domain",$domainName);
    $statement->execute();

    return ($statement->fetchAll(PDO::FETCH_ASSOC));
}

This does not return ANY errors, however no data is displayed. Am I missing something? The purpose is you should be able to run

$query->search(table,field,value); 

and it just works.

Answer 1

Of course nothing is being displayed, you have not told it to display anything. No echo command. No print command. Nothing.

Instead of $query->search(table,field,value); You could try something similar to;

foreach ($query->search(table,field,value) as $row) {
    print $row['DB_COLUMN_1'];
    print $row['DB_COLUMN_2'];
    print $row['DB_COLUMN_3'];
}

Also, if you are using a LIKE clause in your SQL statement you NEED to use percentage signs as wildcards or the LIKE clause wont work as expected. So unless you are looking for an exact match, change your bindParam to:

$statement->bindParam(":domain", "%" . $domainName . "%");