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<?php
// $Id$
/**
* @file
* Query code for SQLite embedded database engine.
*/
/**
* @ingroup database
* @{
*/
/**
* SQLite specific implementation of InsertQuery.
*
* We ignore all the default fields and use the clever SQLite syntax:
* INSERT INTO table DEFAULT VALUES
* for degenerated "default only" queries.
*/
class InsertQuery_sqlite extends InsertQuery {
public function execute() {
if (!$this->preExecute()) {
return NULL;
}
if (count($this->insertFields)) {
return parent::execute();
}
else {
return $this->connection->query('INSERT INTO {' . $this->table . '} DEFAULT VALUES', array(), $this->queryOptions);
}
}
public function __toString() {
// Create a comments string to prepend to the query.
$comments = (!empty($this->comments)) ? '/* ' . implode('; ', $this->comments) . ' */ ' : '';
// Produce as many generic placeholders as necessary.
$placeholders = array_fill(0, count($this->insertFields), '?');
// If we're selecting from a SelectQuery, finish building the query and
// pass it back, as any remaining options are irrelevant.
if (!empty($this->fromQuery)) {
return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $this->insertFields) . ') ' . $this->fromQuery;
}
return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $this->insertFields) . ') VALUES (' . implode(', ', $placeholders) . ')';
}
}
/**
* SQLite specific implementation of UpdateQuery.
*
* SQLite counts all the rows that match the conditions as modified, even if they
* will not be affected by the query. We workaround this by ensuring that
* we don't select those rows.
*
* A query like this one:
* UPDATE test SET name = 'newname' WHERE tid = 1
* will become:
* UPDATE test SET name = 'newname' WHERE tid = 1 AND name <> 'newname'
*/
class UpdateQuery_sqlite extends UpdateQuery {
/**
* Helper function that removes the fields that are already in a condition.
*
* @param $fields
* The fields.
* @param QueryConditionInterface $condition
* A database condition.
*/
protected function removeFieldsInCondition(&$fields, QueryConditionInterface $condition) {
foreach ($condition->conditions() as $child_condition) {
if ($child_condition['field'] instanceof QueryConditionInterface) {
$this->removeFieldsInCondition($fields, $child_condition['field']);
}
else {
unset($fields[$child_condition['field']]);
}
}
}
public function execute() {
if (!empty($this->queryOptions['sqlite_return_matched_rows'])) {
return parent::execute();
}
// Get the fields used in the update query, and remove those that are already
// in the condition.
$fields = $this->expressionFields + $this->fields;
$this->removeFieldsInCondition($fields, $this->condition);
// Add the inverse of the fields to the condition.
$condition = new DatabaseCondition('OR');
foreach ($fields as $field => $data) {
if (is_array($data)) {
// The field is an expression.
$condition->where($field . ' <> ' . $data['expression']);
$condition->isNull($field);
}
elseif (!isset($data)) {
// The field will be set to NULL.
$condition->isNull($field);
}
else {
$condition->condition($field, $data, '<>');
$condition->isNull($field);
}
}
if (count($condition)) {
$condition->compile($this->connection, $this);
$this->condition->where((string) $condition, $condition->arguments());
}
return parent::execute();
}
}
/**
* SQLite specific implementation of DeleteQuery.
*
* When the WHERE is omitted from a DELETE statement and the table being deleted
* has no triggers, SQLite uses an optimization to erase the entire table content
* without having to visit each row of the table individually.
*
* Prior to SQLite 3.6.5, SQLite does not return the actual number of rows deleted
* by that optimized "truncate" optimization.
*/
class DeleteQuery_sqlite extends DeleteQuery {
public function execute() {
if (!count($this->condition)) {
$total_rows = $this->connection->query('SELECT COUNT(*) FROM {' . $this->connection->escapeTable($this->table) . '}')->fetchField();
parent::execute();
return $total_rows;
}
else {
return parent::execute();
}
}
}
/**
* SQLite specific implementation of TruncateQuery.
*
* SQLite doesn't support TRUNCATE, but a DELETE query with no condition has
* exactly the effect (it is implemented by DROPing the table).
*/
class TruncateQuery_sqlite extends TruncateQuery {
public function __toString() {
// Create a comments string to prepend to the query.
$comments = (!empty($this->comments)) ? '/* ' . implode('; ', $this->comments) . ' */ ' : '';
return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '} ';
}
}
/**
* @} End of "ingroup database".
*/
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