Statements to execute first for create(), e.
Statements to execute first for create(), e.g. creating tables and indexes.
Statements to execute after createPhase1, e.
Statements to execute after createPhase1, e.g. creating foreign keys.
Statements to execute first for drop(), e.
Statements to execute first for drop(), e.g. removing connections from other entities.
Statements to execute after dropPhase1, e.
Statements to execute after dropPhase1, e.g. actually dropping a table.
Create a new DDL object which combines this and the other DDL object.
Create the entities described by this DDL object
All statements to execute for create()
Drop the entities described by this DDL object
All statements to execute for drop()
A DDL object contains the SQL statements for creating and dropping database entities. DDLs can be combined for creating or dropping multiple entities together, even if they have circular dependencies.