vendor/illuminate/database/SQLiteConnection.php

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<?php

namespace Illuminate\Database;

use Illuminate\Database\Schema\SQLiteBuilder;
use Illuminate\Database\Query\Processors\SQLiteProcessor;
use Doctrine\DBAL\Driver\PDOSqlite\Driver as DoctrineDriver;
use Illuminate\Database\Query\Grammars\SQLiteGrammar as QueryGrammar;
use Illuminate\Database\Schema\Grammars\SQLiteGrammar as SchemaGrammar;

class SQLiteConnection extends Connection
{
    /**
     * Create a new database connection instance.
     *
     * @param  \PDO|\Closure     $pdo
     * @param  string   $database
     * @param  string   $tablePrefix
     * @param  array    $config
     * @return void
     */
    public function __construct($pdo, $database = '', $tablePrefix = '', array $config = [])
    {
        parent::__construct($pdo, $database, $tablePrefix, $config);

        $enableForeignKeyConstraints = $this->getForeignKeyConstraintsConfigurationValue();

        if ($enableForeignKeyConstraints === null) {
            return;
        }

        $enableForeignKeyConstraints
            ? $this->getSchemaBuilder()->enableForeignKeyConstraints()
            : $this->getSchemaBuilder()->disableForeignKeyConstraints();
    }

    /**
     * Get the default query grammar instance.
     *
     * @return \Illuminate\Database\Query\Grammars\SQLiteGrammar
     */
    protected function getDefaultQueryGrammar()
    {
        return $this->withTablePrefix(new QueryGrammar);
    }

    /**
     * Get a schema builder instance for the connection.
     *
     * @return \Illuminate\Database\Schema\SQLiteBuilder
     */
    public function getSchemaBuilder()
    {
        if (is_null($this->schemaGrammar)) {
            $this->useDefaultSchemaGrammar();
        }

        return new SQLiteBuilder($this);
    }