使用 SET 变量进行 MySQL 查询

我正在try 清理Go调用MySQL查询的方式，方法是在运行查询之前设置一些变量，并在单个值周围使用大量的Case语句.我试图运行的查询在控制台上运行得很好，但在运行GO时，由于语法问题，我在SELECT上失败了.这样的事情有可能发生吗？

func (d *DB) SelectByUserId(uid string, srt string, pg, lim int) ([]Inventory, error) {
    query := `
    SET @user_id := ?,
        @orderBy := ?;
    SELECT
        *
    FROM
        inventory
    WHERE
        user_id = @user_id
    ORDER BY
        (CASE WHEN @orderBy = 'type,asc' THEN type END),
        (CASE WHEN @orderBy = 'type,desc' THEN type END) DESC,
        (CASE WHEN @orderBy = 'visible,asc' THEN visible END),
        (CASE WHEN @orderBy = 'visible,desc' THEN visible END) DESC,
        (CASE WHEN @orderBy = 'create_date,asc' THEN create_date END),
        (CASE WHEN @orderBy = 'create_date,desc' THEN create_date END) DESC,
        (CASE WHEN @orderBy = 'update_date,asc' THEN update_date END),
        (CASE WHEN @orderBy = 'update_date,desc' THEN update_date END) DESC
    LIMIT ?,?;
    `
    
    rows, err := d.Query(
        query,
        uid,
        srt,
        pg*lim,
        lim,
    )

    if err != nil {
        return nil, err
    }
    defer rows.Close()

    result := make([]Inventory, 0)
    for rows.Next() {
        var inv Inventory
        if err := rows.Scan(
            &inv.Id,
            &inv.UserId,
            &inv.Type,
            &inv.Name,
            &inv.Description,
            &inv.Visible,
            &inv.CreateDate,
            &inv.UpdateDate); err != nil {
            return result, err
        }
        result = append(result, inv)
    }
    if err = rows.Err(); err != nil {
        return result, err
    }

    return result, nil
}

现在，如果我拿出设置的棋子，用?替换所有的@个变量，然后多次传递srt个变量，如下所示.但我真的不希望有这样的查询呼叫:

rows, err := d.Query(
        query,
        uid,
        srt,
        srt,
        srt,
        srt,
        srt,
        srt,
        srt,
        srt,
        pg*lim,
        lim)

报告的错误没有多大帮助:

Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT\n    *\nFROM\n    inventory\nWHERE\n    user_id = @user_id\nORDER BY\n ' at line 3

谢谢你的帮助.