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Loads a compiled SQLite extension into the database connection object.
path: Filename of the extension to load.
callback(optional): If provided, this function will be called when the extension was loaded successfully or when an error occurred. The first argument is an error object. When it is
null, loading succeeded. If no callback is provided and an error occurred, an
errorevent with the error object as the only parameter will be emitted on the database object.
Note: Make sure that the extensions you load are compiled or linked against the same version as
node-sqlite3 was compiled. Version mismatches can lead to unpredictable behavior.
Building an Extension
half: The SQLite documentation gives an example of a user-defined function "half" which takes a number and returns a result (the number diveded by two): http://www.sqlite.org/cvstrac/wiki?p=LoadableExtensions
rank: A ready-to
make example from the full-text search docs https://github.com/coolaj86/sqlite3-fts4-rank . See also: http://email@example.com/msg71740.html