<?php
namespace Illuminate\Database\Query\Grammars;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Database\Query\Builder;
class SQLiteGrammar extends Grammar
{
/**
* The components that make up a select clause.
*
* @var array
*/
protected $selectComponents = [
'aggregate',
'columns',
'from',
'joins',
'wheres',
'groups',
'havings',
'orders',
'limit',
'offset',
'lock',
];
/**
* All of the available clause operators.
*
* @var array
*/
protected $operators = [
'=', '<', '>', '<=', '>=', '<>', '!=',
'like', 'not like', 'ilike',
'&', '|', '<<', '>>',
];
/**
* Compile a select query into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @return string
*/
public function compileSelect(Builder $query)
{
$sql = parent::compileSelect($query);
if ($query->unions) {
$sql = 'select * from ('.$sql.') '.$this->compileUnions($query);
}
return $sql;
}
/**
* Compile a single union statement.
*
* @param array $union
* @return string
*/
protected function compileUnion(array $union)
{
$conjunction = $union['all'] ? ' union all ' : ' union ';
return $conjunction.'select * from ('.$union['query']->toSql().')';
}
/**
* Compile a "where date" clause.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $where
* @return string
*/
protected function whereDate(Builder $query, $where)
{
return $this->dateBasedWhere('%Y-%m-%d', $query, $where);
}
/**
* Compile a "where day" clause.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $where
* @return string
*/
protected function whereDay(Builder $query, $where)
{
return $this->dateBasedWhere('%d', $query, $where);
}
/**
* Compile a "where month" clause.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $where
* @return string
*/
protected function whereMonth(Builder $query, $where)
{
return $this->dateBasedWhere('%m', $query, $where);
}
/**
* Compile a "where year" clause.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $where
* @return string
*/
protected function whereYear(Builder $query, $where)
{
return $this->dateBasedWhere('%Y', $query, $where);
}
/**
* Compile a "where time" clause.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $where
* @return string
*/
protected function whereTime(Builder $query, $where)
{
return $this->dateBasedWhere('%H:%M:%S', $query, $where);
}
/**
* Compile a date based where clause.
*
* @param string $type
* @param \Illuminate\Database\Query\Builder $query
* @param array $where
* @return string
*/
protected function dateBasedWhere($type, Builder $query, $where)
{
$value = $this->parameter($where['value']);
return "strftime('{$type}', {$this->wrap($where['column'])}) {$where['operator']} cast({$value} as text)";
}
/**
* Compile an insert statement into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $values
* @return string
*/
public function compileInsert(Builder $query, array $values)
{
// Essentially we will force every insert to be treated as a batch insert which
// simply makes creating the SQL easier for us since we can utilize the same
// basic routine regardless of an amount of records given to us to insert.
$table = $this->wrapTable($query->from);
if (! is_array(reset($values))) {
$values = [$values];
}
// If there is only one record being inserted, we will just use the usual query
// grammar insert builder because no special syntax is needed for the single
// row inserts in SQLite. However, if there are multiples, we'll continue.
if (count($values) === 1) {
return empty(reset($values))
? "insert into $table default values"
: parent::compileInsert($query, reset($values));
}
$names = $this->columnize(array_keys(reset($values)));
$columns = [];
// SQLite requires us to build the multi-row insert as a listing of select with
// unions joining them together. So we'll build out this list of columns and
// then join them all together with select unions to complete the queries.
foreach (array_keys(reset($values)) as $column) {
$columns[] = '? as '.$this->wrap($column);
}
$columns = array_fill(0, count($values), implode(', ', $columns));
return "insert into $table ($names) select ".implode(' union all select ', $columns);
}
/**
* Compile an update statement into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $values
* @return string
*/
public function compileUpdate(Builder $query, $values)
{
$table = $this->wrapTable($query->from);
$columns = collect($values)->map(function ($value, $key) use ($query) {
return $this->wrap(Str::after($key, $query->from.'.')).' = '.$this->parameter($value);
})->implode(', ');
if (isset($query->joins) || isset($query->limit)) {
$selectSql = parent::compileSelect($query->select("{$query->from}.rowid"));
return "update {$table} set $columns where {$this->wrap('rowid')} in ({$selectSql})";
}
return trim("update {$table} set {$columns} {$this->compileWheres($query)}");
}
/**
* Prepare the bindings for an update statement.
*
* @param array $bindings
* @param array $values
* @return array
*/
public function prepareBindingsForUpdate(array $bindings, array $values)
{
$cleanBindings = Arr::except($bindings, ['select', 'join']);
return array_values(
array_merge($values, $bindings['join'], Arr::flatten($cleanBindings))
);
}
/**
* Compile a delete statement into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @return string
*/
public function compileDelete(Builder $query)
{
if (isset($query->joins) || isset($query->limit)) {
$selectSql = parent::compileSelect($query->select("{$query->from}.rowid"));
return "delete from {$this->wrapTable($query->from)} where {$this->wrap('rowid')} in ({$selectSql})";
}
$wheres = is_array($query->wheres) ? $this->compileWheres($query) : '';
return trim("delete from {$this->wrapTable($query->from)} $wheres");
}
/**
* Prepare the bindings for a delete statement.
*
* @param array $bindings
* @return array
*/
public function prepareBindingsForDelete(array $bindings)
{
$cleanBindings = Arr::except($bindings, ['select', 'join']);
return array_values(
array_merge($bindings['join'], Arr::flatten($cleanBindings))
);
}
/**
* Compile a truncate table statement into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @return array
*/
public function compileTruncate(Builder $query)
{
return [
'delete from sqlite_sequence where name = ?' => [$query->from],
'delete from '.$this->wrapTable($query->from) => [],
];
}
}