Can my boyfriend find out if I have a nightclub with my ID card?

No.

You can check your home address, name, ID number, family situation, education, blood type, photos, etc. If an individual is caught committing a crime, the public security organs will also have a criminal record. The ID card is one of the valid identity documents of an individual. The public security organs can check the usage records of the ID card and learn what the person concerned has done with the ID card.

If you work in a nightclub and do not need to book a room, and there is no place to swipe your ID card, it will generally not be found.

Your boyfriend has no right to check your personal information at will.

According to the provisions of Article 19 of the "Resident Identity Card Law of the People's Republic of China", staff of state agencies or financial, telecommunications, transportation, education, medical and other units disclose personal information while performing their duties or providing information. If the citizen's personal information recorded on the resident ID card obtained during the service constitutes a crime, criminal liability shall be investigated in accordance with the law; if it does not constitute a crime, the public security organ shall detain him or her for not less than ten days but not more than fifteen days, and shall also impose a fine of RMB 5,000. If the illegal income is obtained, the illegal income shall be confiscated.