Master Hibernate and JPA with Spring Boot in 100 Steps - Step 17 - JPA and Hibernate Annotations - @Column

The video tutorial covers the process of specifying column names and mapping them in SQL, focusing on the use of the 'add column' annotation. It explains the importance of setting attributes like 'nullable' to ensure data integrity and quality. The tutorial also discusses unit testing, particularly how to handle non-nullable fields and the significance of the 'persist' method in entity management. Additionally, it provides an overview of other column attributes such as 'unique', 'insertable', 'updatable', 'length', 'scale', and 'precision'.

What happens when you update a field mapped to a different column name in the database?

• The changes are sent to both columns.

• The changes are sent to the mapped column.

• The application crashes.

• The changes are ignored.

What does setting the nullable attribute to false imply?

• The field cannot have a null value.

• The field must have a unique value.

• The field can have any value.

• The field is optional.

Why did the unit test initially succeed despite setting a non-nullable field to null?

• The test was not executed properly.

• The field was not mapped correctly.

• The database was not connected.

• The persist method was not called.

What is the purpose of the unique attribute in column annotations?

• To ensure the field value is unique across the table.

• To make the field a primary key.

• To ensure the field is always null.

• To allow duplicate values.

What does setting insertable to false do?

• Allows the column to be updated.

• Ensures the column is always null.

• Prevents the column from being included in insert queries.

• Makes the column a primary key.

How does the updatable attribute affect a column?

• It prevents the column from being included in update statements.

• It allows the column to be inserted.

• It makes the column nullable.

• It sets the column as a primary key.

What is a good practice to ensure data quality in your application?

• Set constraints using column annotations.

• Use random data for testing.

• Avoid using constraints.

• Allow all fields to be nullable.