49 lines
2.2 KiB
Plaintext
49 lines
2.2 KiB
Plaintext
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= API Changes
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* SQLite3::ResultSet used to query the database for the first row, regardless
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of whether the user asked for it or not. I have removed that so that rows
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will not be returned until the user asks for them. This is a subtle but
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sometimes important change in behavior.
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83882d2208ed189361617d5ab8532a325aaf729d
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* SQLite3::Database#trace now takes either a block or an object that responds
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to "call". The previous implementation passed around a VALUE that was cast
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to a void *. This is dangerous because the value could get garbage collected
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before the proc was called. If the user wants data passed around with the
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block, they should use variables available to the closure or create an
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object.
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* SQLite3::Statement#step automatically converts to ruby types, where before
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all values were automatically yielded as strings. This will only be a
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problem for people who were accessing information about the database that
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wasn't previously passed through the pure ruby conversion code.
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* SQLite3::Database#errmsg no longer takes a parameter to return error
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messages as UTF-16. Do people even use that? I opt for staying UTF-8 when
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possible. See test_integration.rb test_errmsg_utf16
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* SQLite3::Database#authorize same changes as trace
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* test/test_tc_database.rb was removed because we no longer use the Driver
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design pattern.
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= Garbage Collection Strategy
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All statements keep pointers back to their respective database connections.
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The @connection instance variable on the Statement handle keeps the database
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connection alive. Memory allocated for a statement handler will be freed in
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two cases:
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* close is called on the statement
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* The SQLite3::Database object gets garbage collected
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We can't free the memory for the statement in the garbage collection function
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for the statement handler. The reason is because there exists a race
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condition. We cannot guarantee the order in which objects will be garbage
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collected. So, it is possible that a connection and a statement are up for
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garbage collection. If the database connection were to be free'd before the
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statement, then boom. Instead we'll be conservative and free unclosed
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statements when the connection is terminated.
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