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SQLite3-OCaml - SQLite3 Bindings for OCaml

What is SQLite3-OCaml?

SQLite3-OCaml is an OCaml library with bindings to the SQLite3 client API. Sqlite3 is a self-contained, serverless, zero-configuration, transactional SQL database engine with outstanding performance for many use cases.

These bindings are written in a way that enables a friendly coexistence with the old (version 2) SQLite and its OCaml wrapper ocaml-sqlite.

Usage

The API in file src/sqlite3.mli is fully documented. It can also be found online.

SQLite3 has its own online documentation.

Examples

The test-directory in this distribution contains a few simple examples for testing various features of this library. The tests can be run by executing dune runtest.

Build issues

SQLite3-OCaml depends on pkg-config to locate and compile against an SQLite3 library.

If the SQLite3 version is greater than or equal to 3.3.7, it is assumed that it supports Run-Time Loadable Extensions. If this feature has been explicitly disabled in the library, building applications will fail with:

Undefined symbols for architecture ...:
  "_sqlite3_enable_load_extension", referenced from:
      _caml_sqlite3_enable_load_extension in libsqlite3_stubs.a(sqlite3_stubs.o)
     (maybe you meant: _caml_sqlite3_enable_load_extension)

  • You can check if your library is missing loadable extensions by searching it for the string OMIT_LOAD_EXTENSION.

  • If you need to change where pkg-config will look for the SQLite3 library, set the PKG_CONFIG_PATH environment variable to the new directory. This can be automated by setting the SQLITE3_OCAML_BREWCHECK environment variable. This will instruct the build to see if a brewed version of SQLite is installed and route pkg-config appropriately.

  • You can explicitly disable run-time loadable extensions by calling configure with the flag --disable-loadable-extensions or by setting the environment variable SQLITE3_DISABLE_LOADABLE_EXTENSIONS if linking problems persist.

  • Due to frequent installation issues with loadable extensions on Mac OS X, the default there is to disable them. You will have to explicitly enable them on that platform.

Credits

  • Mikhail Fedotov wrote ocaml-sqlite for SQLite version 2. His bindings served as a reference for this wrapper, but sqlite3 is written completely from scratch since the C interface changed significantly.

  • Christian Szegedy wrote the initial release for SQLite version 3.

  • Markus Mottl rewrote Christian's bindings for Jane Street Holding, LLC to clean up a few things and to make it perform better in multi-threaded environments.

  • Enrico Tassi contributed support for user-defined scalar functions.

  • Markus W. Weissmann contributed backup functionality.

Contact Information and Contributing

Please submit bugs reports, feature requests, contributions and similar to the GitHub issue tracker.

Up-to-date information is available at: https://mmottl.github.io/sqlite3-ocaml