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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace Wikimedia\Rdbms\Platform;
use Wikimedia\Rdbms\Query;
/**
* @since 1.38
* @see ISQLPlatform
*/
class SqlitePlatform extends SQLPlatform {
public function buildGreatest( $fields, $values ) {
return $this->buildSuperlative( 'MAX', $fields, $values );
}
public function buildLeast( $fields, $values ) {
return $this->buildSuperlative( 'MIN', $fields, $values );
}
/**
* Build a concatenation list to feed into a SQL query
*
* @param string[] $stringList
* @return string
*/
public function buildConcat( $stringList ) {
return '(' . implode( ') || (', $stringList ) . ')';
}
/**
* @param string[] $sqls
* @param bool $all Whether to "UNION ALL" or not
* @param array $options Query options, will be ignored in Sqlite
* @return string
*/
public function unionQueries( $sqls, $all, $options = [] ) {
$glue = $all ? ' UNION ALL ' : ' UNION ';
return implode( $glue, $sqls );
}
/**
* @return bool
*/
public function unionSupportsOrderAndLimit() {
return false;
}
public function buildSubstring( $input, $startPosition, $length = null ) {
$this->assertBuildSubstringParams( $startPosition, $length );
$params = [ $input, $startPosition ];
if ( $length !== null ) {
$params[] = $length;
}
return 'SUBSTR(' . implode( ',', $params ) . ')';
}
/**
* @param string $field Field or column to cast
* @return string
* @since 1.28
*/
public function buildStringCast( $field ) {
return 'CAST ( ' . $field . ' AS TEXT )';
}
public function tableName( string $name, $format = 'quoted' ) {
if ( preg_match( '/^sqlite_[a-z_]+$/', $name ) ) {
// Such names are reserved for internal SQLite tables
return $name;
}
return parent::tableName( $name, $format );
}
protected function makeSelectOptions( array $options ) {
// Remove problematic options that the base implementation converts to SQL
foreach ( $options as $k => $v ) {
if ( is_numeric( $k ) && ( $v === 'FOR UPDATE' || $v === 'LOCK IN SHARE MODE' ) ) {
$options[$k] = '';
}
}
return parent::makeSelectOptions( $options );
}
public function buildGroupConcatField(
$delim, $tables, $field, $conds = '', $join_conds = []
) {
$fld = "group_concat($field," . $this->quoter->addQuotes( $delim ) . ')';
return '(' . $this->selectSQLText( $tables, $fld, $conds, static::CALLER_SUBQUERY, [], $join_conds ) . ')';
}
protected function makeInsertNonConflictingVerbAndOptions() {
return [ 'INSERT OR IGNORE INTO', '' ];
}
/**
* @param array $options
* @return array
*/
protected function makeUpdateOptionsArray( $options ) {
$options = parent::makeUpdateOptionsArray( $options );
$options = $this->rewriteIgnoreKeyword( $options );
return $options;
}
/**
* @param array $options
* @return array
*/
private function rewriteIgnoreKeyword( $options ) {
# SQLite uses OR IGNORE not just IGNORE
foreach ( $options as $k => $v ) {
if ( $v == 'IGNORE' ) {
$options[$k] = 'OR IGNORE';
}
}
return $options;
}
public function dropTableSqlText( $table ) {
// No CASCADE support; https://www.sqlite.org/lang_droptable.html
return "DROP TABLE " . $this->tableName( $table );
}
public function isTransactableQuery( Query $sql ) {
return parent::isTransactableQuery( $sql ) && !in_array(
$sql->getVerb(),
[ 'ATTACH', 'PRAGMA' ],
true
);
}
}
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