Question

What is the use of the dynamic-insert attribute in a class mapping?

A) To generate SQL INSERT statements that only include the columns that have been assigned values.
B) To generate SQL INSERT statements that include all of the columns in the table, even if some of them have not been assigned values.
C) To generate SQL UPDATE statements that only include the columns that have been changed.
D) To generate SQL UPDATE statements that include all of the columns in the table, even if some of them have not been changed.

Answer 1

The dynamic-insert attribute in a class mapping is used to generate SQL INSERT statements that only include the columns that have been assigned values. If set to false, the INSERT statement will include all of the columns, even if some of them have not been assigned values.

Step-by-step explanation:

The dynamic-insert attribute in a class mapping is used to generate SQL INSERT statements that only include the columns that have been assigned values. This means that when an object is saved or updated in the database, only the columns that have changed will be included in the INSERT or UPDATE statement.

For example, if you have a table with columns for name, age, and address, and you only assign a value to the name column when saving an object, the INSERT statement will only include the name column. The age and address columns will be left out, as they have not been assigned values.

If dynamic-insert is set to false, then the INSERT statement will include all of the columns in the table, even if some of them have not been assigned values. This can lead to inefficient queries and unnecessary overhead.