IT討論區(239) - 預祝各位聖誕快樂，新年進步！

function isPhoneNumberUsed(phoneNumber: string): boolean {
    let offset = 0;
    while(true) {
        const connection = openConnection();
        
        const row = query(`
            SELECT
                *
            FROM
                Users
            ORDER BY
                Id
            LIMIT 1
            OFFSET {offset}
        `);
        
        // We looped all rows, the phone number is not used
        if(!row) {
            return false;
        }
        
        if(row.phoneNumber === phoneNumber) {
            return true;
        }            
        
        offset++;
    }
}