How to write mysql query into PDO
Latitude Brace’s Question:
Appreciate if you could help me to write below mysql code to PDO statement.
$sql = "SELECT * FROM node WHERE node_name='$nodename'";
$result = mysql_query($sql);
when I read on PDO::query Manual i found this code
<?php
$connection = new pdo("sqlite:file.sq3");
$query="SELECT * FROM table";
$result = $connection->query($query);
$row = $result->fetch(PDO::FETCH_ASSOC);
print_r($row);
?>
what is the function for “sqlite:file.sq3” and “(PDO::FETCH_ASSOC)”
you connect to the database like this :
try {
$db = new PDO("sqlite:file.sq3");
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
echo 'Error : <br>' . $e->getMessage();
}
PS: You dont need the try and the catch, but we used to get the error and handle it in a nice way as we want to
and next we query like this :
$db->query(SELECT * FROM node WHERE node_name='$nodename'");
and we fetch it like this :
$query = $db->query(SELECT * FROM node WHERE node_name='$nodename'");
$row = $query->fetch(PDO::FETCH_OBJ);
and now you use $row->name for example
here is more about PDO::FETCH
PDO::FETCH_ASSOC: returns an array indexed by column name as returned in your result set
PDO::FETCH_BOTH (default): returns an array indexed by both column name and 0-indexed column number as returned in your result set
PDO::FETCH_BOUND: returns TRUE and assigns the values of the columns in your result set to the PHP variables to which they were
bound with the PDOStatement::bindColumn() methodPDO::FETCH_CLASS: returns a new instance of the requested class, mapping the columns of the result set to named properties in the
class. If fetch_style includes PDO::FETCH_CLASSTYPE (e.g.
PDO::FETCH_CLASS | PDO::FETCH_CLASSTYPE) then the name of the class
is determined from a value of the first column.PDO::FETCH_INTO: updates an existing instance of the requested class, mapping the columns of the result set to named properties in
the classPDO::FETCH_LAZY: combines PDO::FETCH_BOTH and PDO::FETCH_OBJ, creating the object variable names as they are accessed
PDO::FETCH_NUM: returns an array indexed by column number as returned in your result set, starting at column 0
PDO::FETCH_OBJ: returns an anonymous object with property names that correspond to the column names returned in your result set
That line points to your sql file, there is no function for it. It opens a PDO connection and you can query further.
$connection = new pdo("sqlite:/path/to/sql/file.sq3");
PDO::FETCH_ASSOC tells the function fetch() to pull associative array from table.
