d7_to_d10_migration/drupal7/web/includes/database/sqlite/query.inc
Mauricio Dinarte 1664d5cfe6 Initial commit
2024-07-22 21:38:34 -06:00

142 lines
4.5 KiB
PHP

<?php
/**
* @file
* Query code for SQLite embedded database engine.
*/
/**
* @addtogroup 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) || !empty($this->fromQuery)) {
return parent::execute();
}
else {
return $this->connection->query('INSERT INTO {' . $this->table . '} DEFAULT VALUES', array(), $this->queryOptions);
}
}
public function __toString() {
// Create a sanitized comment string to prepend to the query.
$comments = $this->connection->makeComment($this->comments);
// Produce as many generic placeholders as necessary.
$placeholders = array();
if (!empty($this->insertFields)) {
$placeholders = array_fill(0, count($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)) {
$insert_fields_string = $this->insertFields ? ' (' . implode(', ', $this->insertFields) . ') ' : ' ';
return $comments . 'INSERT INTO {' . $this->table . '}' . $insert_fields_string . $this->fromQuery;
}
return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $this->insertFields) . ') VALUES (' . implode(', ', $placeholders) . ')';
}
}
/**
* SQLite specific implementation of UpdateQuery.
*
* SQLite counts all the rows that match the conditions as modified, even if they
* will not be affected by the query. We workaround this by ensuring that
* we don't select those rows.
*
* A query like this one:
* UPDATE test SET col1 = 'newcol1', col2 = 'newcol2' WHERE tid = 1
* will become:
* UPDATE test SET col1 = 'newcol1', col2 = 'newcol2' WHERE tid = 1 AND (col1 <> 'newcol1' OR col2 <> 'newcol2')
*/
class UpdateQuery_sqlite extends UpdateQuery {
public function execute() {
if (!empty($this->queryOptions['sqlite_return_matched_rows'])) {
return parent::execute();
}
// Get the fields used in the update query.
$fields = $this->expressionFields + $this->fields;
// 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.
$condition->isNotNull($field);
}
else {
$condition->condition($field, $data, '<>');
$condition->isNull($field);
}
}
if (count($condition)) {
$condition->compile($this->connection, $this);
$this->condition->where((string) $condition, $condition->arguments());
}
return parent::execute();
}
}
/**
* SQLite specific implementation of DeleteQuery.
*/
class DeleteQuery_sqlite extends DeleteQuery {
public function execute() {
// When the WHERE is omitted from a DELETE statement and the table being
// deleted has no triggers, SQLite uses an optimization to erase the entire
// table content without having to visit each row of the table individually.
// Prior to SQLite 3.6.5, SQLite does not return the actual number of rows
// deleted by that optimized "truncate" optimization. But we want to return
// the number of rows affected, so we calculate it directly.
if (!count($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 sanitized comment string to prepend to the query.
$comments = $this->connection->makeComment($this->comments);
return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '} ';
}
}
/**
* @} End of "addtogroup database".
*/