Go MySQL 쿼리에서 SET 변수를 사용하는 방법은 무엇입니까?

<code class="go">func (d *DB) SelectByUserId(uid string, srt string, pg, lim int) ([]Inventory, error) {
    query := `
    SELECT
        *
    FROM
        inventory
    WHERE
        user_id = ?
    ORDER BY
        ` + generateOrderBy(srt) + `
    LIMIT ?,?;
    `

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

    // ... (rest of the code remains the same)

    return result, nil
}

func generateOrderBy(srt string) string {
    order := ""
    switch srt {
    case "type,asc":
        order = "`type` ASC"
    case "type,desc":
        order = "`type` DESC"
    // ... (add other cases)
    }
    return order
}</code>

<code class="go">func (d *DB) SelectByUserId(uid string, srt string, pg, lim int) ([]Inventory, error) {
    query := fmt.Sprintf(`
    SELECT
        *
    FROM
        inventory
    WHERE
        user_id = '%s'
    ORDER BY
        CASE WHEN '%s' = 'type,asc' THEN `type` END,
        CASE WHEN '%s' = 'type,desc' THEN `type` END DESC,
        CASE WHEN '%s' = 'visible,asc' THEN visible END,
        CASE WHEN '%s' = 'visible,desc' THEN visible END DESC,
        CASE WHEN '%s' = 'create_date,asc' THEN create_date END,
        CASE WHEN '%s' = 'create_date,desc' THEN create_date END DESC,
        CASE WHEN '%s' = 'update_date,asc' THEN update_date END,
        CASE WHEN '%s' = 'update_date,desc' THEN update_date END DESC
    LIMIT %d,%d;
    `, uid, srt, srt, srt, srt, srt, srt, srt, srt, pg*lim, lim)

    rows, err := d.Query(
        query,
    )

    // ... (rest of the code remains the same)

    return result, nil
}</code>