Why am I getting the 'SQLITE_CONSTRAINT_PRIMARYKEY: sqlite3 result code 1555: UNIQUE constraint failed: Persons.id' error?

SQLITE_CONSTRAINT_PRIMARYKEY: sqlite3 result code 1555: UNIQUE constraint failed: Persons.id

The error "SQLITE_CONSTRAINT_PRIMARYKEY: sqlite3 result code 1555: UNIQUE constraint failed: Persons.id" indicates that a unique constraint has been violated, preventing the data from being inserted into the database. In your case, the error is occurring when trying to insert data into the "list" and "item" tables.

Reason for the Error:

The "list" table has a primary key defined on the "list_id" column, which means that each row in the table must have a unique "list_id" value. Similarly, the "item" table has a primary key on the "item_id" column.

When you attempted to insert records into the "list" and "item" tables, some of the "list_id" and "item_id" values being inserted were not unique. This violated the UNIQUE constraint, resulting in the error.

Solution:

To resolve this issue, you need to ensure that the "list_id" and "item_id" values being inserted are unique. You can achieve this by:

• Automatically Generating Unique Values: Use auto-incrementing primary keys or a unique ID generator to automatically generate unique values for the "list_id" and "item_id" columns on insertion.
• Manually Ensuring Uniqueness: Before inserting data, check whether the "list_id" or "item_id" values already exist in their respective tables. If they do, generate a new unique value and use that instead.
• Updating Existing Data: If the records you are trying to insert are duplicates of existing records, consider updating the existing records instead of inserting new ones.

Once you have ensured that the "list_id" and "item_id" values are unique, the data insertion should succeed without the unique constraint error.

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