Question

我有MySQL 5.6，我需要使用MySQL 5.7函数ST_Distance_Sphere（用于地理定位）。

我找到了this hack，它对我来说看起来正确（？）。

现在我正在尝试在Laravel 5.5中使用它。

我将其放在app\Providers\AppServiceProvider.php函数的boot()中。

我尝试使用DB::statement，DB::raw，DB::unprepared。

我尝试删除DELIMITER和$$。

$sql = '
        DELIMITER $$

        DROP FUNCTION IF EXISTS `ST_Distance_Sphere`$$

        CREATE FUNCTION `ST_Distance_Sphere` (point1 POINT, point2 POINT)

            RETURNS FLOAT
            no sql deterministic
            BEGIN
                declare R INTEGER DEFAULT 6371000;
                declare `φ1` float;
                declare `φ2` float;
                declare `Δφ` float;
                declare `Δλ` float;
                declare a float;
                declare c float;
                set `φ1` = radians(y(point1));
                set `φ2` = radians(y(point2));
                set `Δφ` = radians(y(point2) - y(point1));
                set `Δλ` = radians(x(point2) - x(point1));

                set a = sin(`Δφ` / 2) * sin(`Δφ` / 2) + cos(`φ1`) * cos(`φ2`) * sin(`Δλ` / 2) * sin(`Δλ` / 2);
                set c = 2 * atan2(sqrt(a), sqrt(1-a));

                return R * c;
            END$$

        DELIMITER ;
    ';

DB::statement($sql);

我每次都有语法错误。例如：

``Illuminate \ Database \ QueryException (42000)SQLSTATE[42000]: Syntax error or access violation: 1064 Erreur de syntaxe près de 'DELIMITER $$ DROP FUNCTION IF EXISTS `ST_Distance_Sphere`$$ ' à la ligne 1 (SQL: DELIMITER $$ DROP FUNCTION IF EXISTS `ST_Distance_Sphere`$$ CREATE FUNCTION `ST_Distance_Sphere` (point1 POINT, point2 POINT) RETURNS FLOAT no sql deterministic BEGIN declare R INTEGER DEFAULT 6371000; declare `φ1` float; declare `φ2` float; declare `Δφ` float; declare `Δλ` float; declare a float; declare c float; set `φ1` = radians(y(point1)); set `φ2` = radians(y(point2)); set `Δφ` = radians(y(point2) - y(point1)); set `Δλ` = radians(x(point2) - x(point1)); set a = sin(`Δφ` / 2) * sin(`Δφ` / 2) + cos(`φ1`) * cos(`φ2`) * sin(`Δλ` / 2) * sin(`Δλ` / 2); set c = 2 * atan2(sqrt(a), sqrt(1-a)); return R * c; END$$ DELIMITER ; )``

Answer 1

我回答了我自己的问题

似乎我无权删除MySQL函数...

所以我用MySQL版本检查取代了DROP FUNCTION IF EXISTS `ST_Distance_Sphere`：

$mysql_version_check = DB::select(DB::raw('SHOW VARIABLES LIKE "version";'));
$mysql_version = $mysql_version_check[0]->Value;
if (substr($mysql_version,2, 1) < '7' AND substr($mysql_version,4, 1) < '6') {
    $sql = '
        CREATE FUNCTION `ST_Distance_Sphere` (point1 POINT, point2 POINT)

            RETURNS FLOAT
            no sql deterministic
            BEGIN
                declare R INTEGER DEFAULT 6371000;
                declare `φ1` float;
                declare `φ2` float;
                declare `Δφ` float;
                declare `Δλ` float;
                declare a float;
                declare c float;
                set `φ1` = radians(y(point1));
                set `φ2` = radians(y(point2));
                set `Δφ` = radians(y(point2) - y(point1));
                set `Δλ` = radians(x(point2) - x(point1));

                set a = sin(`Δφ` / 2) * sin(`Δφ` / 2) + cos(`φ1`) * cos(`φ2`) * sin(`Δλ` / 2) * sin(`Δλ` / 2);
                set c = 2 * atan2(sqrt(a), sqrt(1-a));

                return R * c;
            END;
    ';

    DB::unprepared($sql);

}

这有点丑陋，但似乎可以正常工作...

编辑

实际上，它只会在第一次执行时起作用。看来此函数可以将mysql函数保存到mysql数据库中。下次您将出现错误，例如“ Mysql函数已经存在”。您只需注释上面的方框。

在Laravel 5.5中创建MySQL函数

1 个答案:

编辑