There are several ways to generate query results:
getResult()
This method returns the query result as an array of objects, or an empty array on failure. Typically you'll use this in a foreach loop, like this:
$query = $db->query("YOUR QUERY");
foreach ($query->getResult() as $row)
{
echo $row->title;
echo $row->name;
echo $row->body;
}
The above method is an alias of getResultObject().
You can pass in the string 'array' if you wish to get your results as an array of arrays:
$query = $db->query("YOUR QUERY");
foreach ($query->getResult('array') as $row)
{
echo $row['title'];
echo $row['name'];
echo $row['body'];
}
The above usage is an alias of getResultArray().
You can also pass a string to getResult() which represents a class to
instantiate for each result object
$query = $db->query("SELECT * FROM users;");
foreach ($query->getResult('User') as $user)
{
echo $user->name; // access attributes
echo $user->reverseName(); // or methods defined on the 'User' class
}
The above method is an alias of getCustomResultObject().
getResultArray()
This method returns the query result as a pure array, or an empty array when no result is produced. Typically you'll use this in a foreach loop, like this:
$query = $db->query("YOUR QUERY");
foreach ($query->getResultArray() as $row)
{
echo $row['title'];
echo $row['name'];
echo $row['body'];
}
getRow()
This method returns a single result row. If your query has more than one row, it returns only the first row. The result is returned as an object. Here's a usage example:
$query = $db->query("YOUR QUERY");
$row = $query->getRow();
if (isset($row))
{
echo $row->title;
echo $row->name;
echo $row->body;
}
If you want a specific row returned you can submit the row number as a digit in the first parameter:
$row = $query->getRow(5);
You can also add a second String parameter, which is the name of a class to instantiate the row with:
$query = $db->query("SELECT * FROM users LIMIT 1;");
$row = $query->getRow(0, 'User');
echo $row->name; // access attributes
echo $row->reverse_name(); // or methods defined on the 'User' class
getRowArray()
Identical to the above row() method, except it returns an array.
Example:
$query = $db->query("YOUR QUERY");
$row = $query->getRowArray();
if (isset($row))
{
echo $row['title'];
echo $row['name'];
echo $row['body'];
}
If you want a specific row returned you can submit the row number as a digit in the first parameter:
$row = $query->getRowArray(5);
In addition, you can walk forward/backwards/first/last through your results using these variations:
$row = $query->getFirstRow()$row = $query->getLastRow()$row = $query->getNextRow()$row = $query->getPreviousRow()
By default they return an object unless you put the word "array" in the parameter:
$row = $query->getFirstRow('array')$row = $query->getLastRow('array')$row = $query->getNextRow('array')$row = $query->getPreviousRow('array')
Note
All the methods above will load the whole result into memory
(prefetching). Use getUnbufferredRow() for processing large
result sets.
getUnbufferedRow()
This method returns a single result row without prefetching the whole
result in memory as row() does. If your query has more than one row,
it returns the current row and moves the internal data pointer ahead.
$query = $db->query("YOUR QUERY");
while ($row = $query->getUnbufferedRow())
{
echo $row->title;
echo $row->name;
echo $row->body;
}
You can optionally pass 'object' (default) or 'array' in order to specify the returned value's type:
$query->getUnbufferedRow(); // object
$query->getUnbufferedRow('object'); // object
$query->getUnbufferedRow('array'); // associative array
You can have the results returned as an instance of a custom class instead
of a stdClass or array, as the getResult() and getResultArray()
methods allow. If the class is not already loaded into memory, the Autoloader
will attempt to load it. The object will have all values returned from the
database set as properties. If these have been declared and are non-public
then you should provide a __set() method to allow them to be set.
Example:
class User
{
public $id;
public $email;
public $username;
protected $last_login;
public function lastLogin($format)
{
return $this->lastLogin->format($format);
}
public function __set($name, $value)
{
if ($name === 'lastLogin')
{
$this->lastLogin = DateTime::createFromFormat('U', $value);
}
}
public function __get($name)
{
if (isset($this->$name))
{
return $this->$name;
}
}
}
In addition to the two methods listed below, the following methods also can
take a class name to return the results as: getFirstRow(), getLastRow(),
getNextRow(), and getPreviousRow().
getCustomResultObject()
Returns the entire result set as an array of instances of the class requested. The only parameter is the name of the class to instantiate.
Example:
$query = $db->query("YOUR QUERY");
$rows = $query->getCustomResultObject('User');
foreach ($rows as $row)
{
echo $row->id;
echo $row->email;
echo $row->last_login('Y-m-d');
}
getCustomRowObject()
Returns a single row from your query results. The first parameter is the row number of the results. The second parameter is the class name to instantiate.
Example:
$query = $db->query("YOUR QUERY");
$row = $query->getCustomRowObject(0, 'User');
if (isset($row))
{
echo $row->email; // access attributes
echo $row->last_login('Y-m-d'); // access class methods
}
You can also use the getRow() method in exactly the same way.
Example:
$row = $query->getCustomRowObject(0, 'User');
getFieldCount()
The number of FIELDS (columns) returned by the query. Make sure to call the method using your query result object:
$query = $db->query('SELECT * FROM my_table');
echo $query->getFieldCount();
getFieldNames()
Returns an array with the names of the FIELDS (columns) returned by the query. Make sure to call the method using your query result object:
$query = $db->query('SELECT * FROM my_table');
echo $query->getFieldNames();
freeResult()
It frees the memory associated with the result and deletes the result resource ID. Normally PHP frees its memory automatically at the end of script execution. However, if you are running a lot of queries in a particular script you might want to free the result after each query result has been generated in order to cut down on memory consumption.
Example:
$query = $thisdb->query('SELECT title FROM my_table');
foreach ($query->getResult() as $row)
{
echo $row->title;
}
$query->freeResult(); // The $query result object will no longer be available
$query2 = $db->query('SELECT name FROM some_table');
$row = $query2->getRow();
echo $row->name;
$query2->freeResult(); // The $query2 result object will no longer be available
dataSeek()
This method sets the internal pointer for the next result row to be
fetched. It is only useful in combination with getUnbufferedRow().
It accepts a positive integer value, which defaults to 0 and returns TRUE on success or FALSE on failure.
$query = $db->query('SELECT `field_name` FROM `table_name`');
$query->dataSeek(5); // Skip the first 5 rows
$row = $query->getUnbufferedRow();
Note
Not all database drivers support this feature and will return FALSE. Most notably - you won't be able to use it with PDO.
.. php:class:: \CodeIgniter\Database\BaseResult
.. php:method:: getResult([$type = 'object'])
:param string $type: Type of requested results - array, object, or class name
:returns: Array containing the fetched rows
:rtype: array
A wrapper for the ``getResultArray()``, ``getResultObject()``
and ``getCustomResultObject()`` methods.
Usage: see `Result Arrays`_.
.. php:method:: getResultArray()
:returns: Array containing the fetched rows
:rtype: array
Returns the query results as an array of rows, where each
row is itself an associative array.
Usage: see `Result Arrays`_.
.. php:method:: getResultObject()
:returns: Array containing the fetched rows
:rtype: array
Returns the query results as an array of rows, where each
row is an object of type ``stdClass``.
Usage: see `Result Arrays`_.
.. php:method:: getCustomResultObject($class_name)
:param string $class_name: Class name for the resulting rows
:returns: Array containing the fetched rows
:rtype: array
Returns the query results as an array of rows, where each
row is an instance of the specified class.
.. php:method:: getRow([$n = 0[, $type = 'object']])
:param int $n: Index of the query results row to be returned
:param string $type: Type of the requested result - array, object, or class name
:returns: The requested row or NULL if it doesn't exist
:rtype: mixed
A wrapper for the ``getRowArray()``, ``getRowObject()`` and
``getCustomRowObject()`` methods.
Usage: see `Result Rows`_.
.. php:method:: getUnbufferedRow([$type = 'object'])
:param string $type: Type of the requested result - array, object, or class name
:returns: Next row from the result set or NULL if it doesn't exist
:rtype: mixed
Fetches the next result row and returns it in the
requested form.
Usage: see `Result Rows`_.
.. php:method:: getRowArray([$n = 0])
:param int $n: Index of the query results row to be returned
:returns: The requested row or NULL if it doesn't exist
:rtype: array
Returns the requested result row as an associative array.
Usage: see `Result Rows`_.
.. php:method:: getRowObject([$n = 0])
:param int $n: Index of the query results row to be returned
:returns: The requested row or NULL if it doesn't exist
:rtype: stdClass
Returns the requested result row as an object of type
``stdClass``.
Usage: see `Result Rows`_.
.. php:method:: getCustomRowObject($n, $type)
:param int $n: Index of the results row to return
:param string $class_name: Class name for the resulting row
:returns: The requested row or NULL if it doesn't exist
:rtype: $type
Returns the requested result row as an instance of the
requested class.
.. php:method:: dataSeek([$n = 0])
:param int $n: Index of the results row to be returned next
:returns: TRUE on success, FALSE on failure
:rtype: bool
Moves the internal results row pointer to the desired offset.
Usage: see `Result Helper Methods`_.
.. php:method:: setRow($key[, $value = NULL])
:param mixed $key: Column name or array of key/value pairs
:param mixed $value: Value to assign to the column, $key is a single field name
:rtype: void
Assigns a value to a particular column.
.. php:method:: getNextRow([$type = 'object'])
:param string $type: Type of the requested result - array, object, or class name
:returns: Next row of result set, or NULL if it doesn't exist
:rtype: mixed
Returns the next row from the result set.
.. php:method:: getPreviousRow([$type = 'object'])
:param string $type: Type of the requested result - array, object, or class name
:returns: Previous row of result set, or NULL if it doesn't exist
:rtype: mixed
Returns the previous row from the result set.
.. php:method:: getFirstRow([$type = 'object'])
:param string $type: Type of the requested result - array, object, or class name
:returns: First row of result set, or NULL if it doesn't exist
:rtype: mixed
Returns the first row from the result set.
.. php:method:: getLastRow([$type = 'object'])
:param string $type: Type of the requested result - array, object, or class name
:returns: Last row of result set, or NULL if it doesn't exist
:rtype: mixed
Returns the last row from the result set.
.. php:method:: getFieldCount()
:returns: Number of fields in the result set
:rtype: int
Returns the number of fields in the result set.
Usage: see `Result Helper Methods`_.
.. php:method:: getFieldNames()
:returns: Array of column names
:rtype: array
Returns an array containing the field names in the
result set.
.. php:method:: getFieldData()
:returns: Array containing field meta-data
:rtype: array
Generates an array of ``stdClass`` objects containing
field meta-data.
.. php:method:: freeResult()
:rtype: void
Frees a result set.
Usage: see `Result Helper Methods`_.