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How does lastInsertId() work for tables that do not have an auto-incremented field? What about tables where the primary key is made up of 2 fields?
(I’m working with MySQL)
In both cases above it will return
0.When using an auto_increment column, it will return the last INSERT ID even if it was specified (i.e. the auto increment was not used).
That is to say you should only use
lastInsertIdwhen using auto increment. It doesn’t really make sense to use it otherwise since you would have to know the keys ahead of time anyway..