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Filename : Builder.php
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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\Database\MySQLi;

use CodeIgniter\Database\BaseBuilder;

/**
 * Builder for MySQLi
 */
class Builder extends BaseBuilder
{
    /**
     * Identifier escape character
     *
     * @var string
     */
    protected $escapeChar = '`';

    /**
     * Specifies which sql statements
     * support the ignore option.
     *
     * @var array
     */
    protected $supportedIgnoreStatements = [
        'update' => 'IGNORE',
        'insert' => 'IGNORE',
        'delete' => 'IGNORE',
    ];

    /**
     * FROM tables
     *
     * Groups tables in FROM clauses if needed, so there is no confusion
     * about operator precedence.
     *
     * Note: This is only used (and overridden) by MySQL.
     */
    protected function _fromTables(): string
    {
        if (! empty($this->QBJoin) && count($this->QBFrom) > 1) {
            return '(' . implode(', ', $this->QBFrom) . ')';
        }

        return implode(', ', $this->QBFrom);
    }
}