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.


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

SQLite3 has its own online documentation.


The test-directory in this distribution contains a few simple examples
for testing various features of this library.

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.


  • 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

  • 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