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<?php
/**
* @package Joomla.Platform
* @subpackage Database
*
* @copyright (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* SQLite Query Building Class.
*
* @since 3.0.0
*/
class JDatabaseQuerySqlite extends JDatabaseQueryPdo implements JDatabaseQueryPreparable, JDatabaseQueryLimitable
{
/**
* @var integer The offset for the result set.
* @since 3.0.0
*/
protected $offset;
/**
* @var integer The limit for the result set.
* @since 3.0.0
*/
protected $limit;
/**
* @var array Bounded object array
* @since 3.0.0
*/
protected $bounded = array();
/**
* Method to add a variable to an internal array that will be bound to a prepared SQL statement before query execution. Also
* removes a variable that has been bounded from the internal bounded array when the passed in value is null.
*
* @param string|integer $key The key that will be used in your SQL query to reference the value. Usually of
* the form ':key', but can also be an integer.
* @param mixed &$value The value that will be bound. The value is passed by reference to support output
* parameters such as those possible with stored procedures.
* @param integer $dataType Constant corresponding to a SQL datatype.
* @param integer $length The length of the variable. Usually required for OUTPUT parameters.
* @param array $driverOptions Optional driver options to be used.
*
* @return JDatabaseQuerySqlite
*
* @since 3.0.0
*/
public function bind($key = null, &$value = null, $dataType = PDO::PARAM_STR, $length = 0, $driverOptions = array())
{
// Case 1: Empty Key (reset $bounded array)
if (empty($key))
{
$this->bounded = array();
return $this;
}
// Case 2: Key Provided, null value (unset key from $bounded array)
if (is_null($value))
{
if (isset($this->bounded[$key]))
{
unset($this->bounded[$key]);
}
return $this;
}
$obj = new stdClass;
$obj->value = &$value;
$obj->dataType = $dataType;
$obj->length = $length;
$obj->driverOptions = $driverOptions;
// Case 3: Simply add the Key/Value into the bounded array
$this->bounded[$key] = $obj;
return $this;
}
/**
* Retrieves the bound parameters array when key is null and returns it by reference. If a key is provided then that item is
* returned.
*
* @param mixed $key The bounded variable key to retrieve.
*
* @return mixed
*
* @since 3.0.0
*/
public function &getBounded($key = null)
{
if (empty($key))
{
return $this->bounded;
}
else
{
if (isset($this->bounded[$key]))
{
return $this->bounded[$key];
}
}
}
/**
* Gets the number of characters in a string.
*
* Note, use 'length' to find the number of bytes in a string.
*
* Usage:
* $query->select($query->charLength('a'));
*
* @param string $field A value.
* @param string $operator Comparison operator between charLength integer value and $condition
* @param string $condition Integer value to compare charLength with.
*
* @return string The required char length call.
*
* @since 3.2.0
*/
public function charLength($field, $operator = null, $condition = null)
{
return 'length(' . $field . ')' . (isset($operator) && isset($condition) ? ' ' . $operator . ' ' . $condition : '');
}
/**
* Clear data from the query or a specific clause of the query.
*
* @param string $clause Optionally, the name of the clause to clear, or nothing to clear the whole query.
*
* @return JDatabaseQuerySqlite Returns this object to allow chaining.
*
* @since 3.0.0
*/
public function clear($clause = null)
{
switch ($clause)
{
case null:
$this->bounded = array();
break;
}
parent::clear($clause);
return $this;
}
/**
* Concatenates an array of column names or values.
*
* Usage:
* $query->select($query->concatenate(array('a', 'b')));
*
* @param array $values An array of values to concatenate.
* @param string $separator As separator to place between each value.
*
* @return string The concatenated values.
*
* @since 1.7.0
*/
public function concatenate($values, $separator = null)
{
if ($separator)
{
return implode(' || ' . $this->quote($separator) . ' || ', $values);
}
else
{
return implode(' || ', $values);
}
}
/**
* Method to modify a query already in string format with the needed
* additions to make the query limited to a particular number of
* results, or start at a particular offset. This method is used
* automatically by the __toString() method if it detects that the
* query implements the JDatabaseQueryLimitable interface.
*
* @param string $query The query in string format
* @param integer $limit The limit for the result set
* @param integer $offset The offset for the result set
*
* @return string
*
* @since 3.0.0
*/
public function processLimit($query, $limit, $offset = 0)
{
if ($limit > 0 || $offset > 0)
{
$query .= ' LIMIT ' . $offset . ', ' . $limit;
}
return $query;
}
/**
* Sets the offset and limit for the result set, if the database driver supports it.
*
* Usage:
* $query->setLimit(100, 0); (retrieve 100 rows, starting at first record)
* $query->setLimit(50, 50); (retrieve 50 rows, starting at 50th record)
*
* @param integer $limit The limit for the result set
* @param integer $offset The offset for the result set
*
* @return JDatabaseQuerySqlite Returns this object to allow chaining.
*
* @since 3.0.0
*/
public function setLimit($limit = 0, $offset = 0)
{
$this->limit = (int) $limit;
$this->offset = (int) $offset;
return $this;
}
/**
* Add to the current date and time.
* Usage:
* $query->select($query->dateAdd());
* Prefixing the interval with a - (negative sign) will cause subtraction to be used.
*
* @param datetime $date The date or datetime to add to
* @param string $interval The string representation of the appropriate number of units
* @param string $datePart The part of the date to perform the addition on
*
* @return string The string with the appropriate sql for addition of dates
*
* @since 3.2.0
* @link http://www.sqlite.org/lang_datefunc.html
*/
public function dateAdd($date, $interval, $datePart)
{
// SQLite does not support microseconds as a separate unit. Convert the interval to seconds
if (strcasecmp($datePart, 'microseconds') == 0)
{
// Force the dot as a decimal point
$interval = str_replace(',', '.', .001 * $interval);
$datePart = 'seconds';
}
if (substr($interval, 0, 1) != '-')
{
return "datetime('" . $date . "', '+" . $interval . " " . $datePart . "')";
}
else
{
return "datetime('" . $date . "', '" . $interval . " " . $datePart . "')";
}
}
/**
* Gets the current date and time.
*
* Usage:
* $query->where('published_up < '.$query->currentTimestamp());
*
* @return string
*
* @since 3.4
*/
public function currentTimestamp()
{
return 'CURRENT_TIMESTAMP';
}
/**
* Magic function to convert the query to a string.
*
* @return string The completed query.
*
* @since 1.7.0
*/
public function __toString()
{
switch ($this->type)
{
case 'select':
if ($this->selectRowNumber)
{
$orderBy = $this->selectRowNumber['orderBy'];
$orderColumnAlias = $this->selectRowNumber['orderColumnAlias'];
$column = "ROW_NUMBER() AS $orderColumnAlias";
if ($this->select === null)
{
$query = PHP_EOL . "SELECT 1"
. (string) $this->from
. (string) $this->where;
}
else
{
$tmpOffset = $this->offset;
$tmpLimit = $this->limit;
$this->offset = 0;
$this->limit = 0;
$tmpOrder = $this->order;
$this->order = null;
$query = parent::__toString();
$column = "w.*, $column";
$this->order = $tmpOrder;
$this->offset = $tmpOffset;
$this->limit = $tmpLimit;
}
// Special sqlite query to count ROW_NUMBER
$query = PHP_EOL . "SELECT $column"
. PHP_EOL . "FROM ($query" . PHP_EOL . "ORDER BY $orderBy"
. PHP_EOL . ") AS w,(SELECT ROW_NUMBER(0)) AS r"
// Forbid to flatten subqueries.
. ((string) $this->order ?: PHP_EOL . 'ORDER BY NULL');
return $this->processLimit($query, $this->limit, $this->offset);
}
break;
case 'update':
if ($this->join)
{
$table = $this->update->getElements();
$table = $table[0];
$tableName = explode(' ', $table);
$tableName = $tableName[0];
if ($this->columns === null)
{
$fields = $this->db->getTableColumns($tableName);
foreach ($fields as $key => $value)
{
$fields[$key] = $key;
}
$this->columns = new JDatabaseQueryElement('()', $fields);
}
$fields = $this->columns->getElements();
$elements = $this->set->getElements();
foreach ($elements as $nameValue)
{
$setArray = explode(' = ', $nameValue, 2);
if ($setArray[0][0] === '`')
{
// Unquote column name
$setArray[0] = substr($setArray[0], 1, -1);
}
$fields[$setArray[0]] = $setArray[1];
}
$select = new JDatabaseQuerySqlite($this->db);
$select->select(array_values($fields))
->from($table);
$select->join = $this->join;
$select->where = $this->where;
return 'INSERT OR REPLACE INTO ' . $tableName
. ' (' . implode(',', array_keys($fields)) . ')'
. (string) $select;
}
}
return parent::__toString();
}
/**
* Return the number of the current row.
*
* @param string $orderBy An expression of ordering for window function.
* @param string $orderColumnAlias An alias for new ordering column.
*
* @return JDatabaseQuery Returns this object to allow chaining.
*
* @since 3.7.0
* @throws RuntimeException
*/
public function selectRowNumber($orderBy, $orderColumnAlias)
{
$this->validateRowNumber($orderBy, $orderColumnAlias);
return $this;
}
}