If the transaction modified a row and then deleted it, the IDL would
instead mistakenly leave the row entirely untouched.
This commit fixes this bug. It needs a regression test, but this commit
does not add one.
When the IDL was used to insert a row, but all of the new row's columns
were left at the default values, then the IDL would not insert the row at
all.
When the IDL was used to delete one or more rows, and the transaction did
not include any update or insertion operations, the transaction was dropped
entirely.
This commit fixes these two bugs. It needs a regression test, but this
commit does not add one.
Until now, the "set" functions generated by the IDL updated the data in the
database (during commit) but not the data exposed by the IDL in its data
structures. This was just an oversight, so this commit causes the data
exposed by IDL to be updated also.
Our tests only checked references from a table to itself, so of course
there were bugs in references from one table to another. This fixes the
obvious one and adds a test.
