This is LuaPSQL, a binding of PostgreSQL's client library, libpq, for Lua. This module is specific to PostgreSQL and offers more functionality when compared to the generic LuaSQL bindings:

• Binary types as equivalent as possible to Lua types
• Asynchronous connections and query executions
• Parametrizable statements
• Prepared statements

The routines are, however, low-level methods, most of them simply wrapping their C counterparts. For this reason, a more detailed documentation is not included and the user can refer to PostgreSQL's documentation on libpq for details -- check the chapter entitled "libpq - C library". This binding is fairly complete, with the sole exception of function associated with the COPY command.