SQLiteConn: Add 'Raw' method to give access to underlying sqlite3 context structure #1360
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…text structure This is necessary, for instance, to allow users of the package to make their own CGo callbacks, and have the underlying sqlite3 library call those C functions directly. Note that the intention from the sqlite3 library seems to be that there should be a measure of binary compatibility between versions: even extensions compiled against an older different version of sqlite3 should be able to call sqlite3_create_function with no problems. So this should work even if users of the package have a slightly different version of the sqlite3.h header. Note that the code itself was written by @rittneje. I tested it and wrote the comments. Signed-off-by: George Dunlap <[email protected]> v2: Just copy @rittneje's code exactly: - Grab the lock while the function is running - Replace the error code with our own if it's of type ErrNo
Note that you can't call cgo from within a test file; so in order to test the functionality, create new package, .../internal/sqlite3test, to define the callback. Then in the main sqlite3 package, add a test file which includes this package and calls the callback. As with the previous commit, the idea and the basic code was written by @rittneje; I massaged it so that it compiled and passed with Go 1.9, and wrote this commit message and the comments. NB that Golang 1.9 doesn't have sql.OpenDB, so we have to register a new database driver. Signed-off-by: George Dunlap <[email protected]> v4: - Refactor to get rid of sql.OpenDB call, which only appeared in Go 1.10 v3: - New
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This is a rebased / re-opened version of #784, which got closed when I accidentally deleted the backing branch from github. |
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This is necessary, for instance, to allow users of the package to make
their own CGo callbacks, and have the underlying sqlite3 library call
those C functions directly.
Note that the intention from the sqlite3 library seems to be that
there should be a measure of binary compatibility between versions:
even extensions compiled against an older different version of sqlite3
should be able to call sqlite3_create_function with no problems. So
this should work even if users of the package have a slightly
different version of the sqlite3.h header.
Note that the code itself was written by @rittneje. I tested it and
wrote the comments.
Signed-off-by: George Dunlap [email protected]
v2:
Just copy @rittneje's code exactly: