Root of the "hasql" ecosystem. This library provides connection management, execution of queries and mapping of parameters and results. Extended functionality such as pooling, transactions and compile-time checking of SQL is provided by extension libraries. For more details and tutorials see the readme. The API comes free from all kinds of exceptions. All error-reporting is explicit and is presented using the Either type. "hasql" requires you to have the "libpq" C-library of at least version 14 installed to compile. "libpq" comes distributed with PostgreSQL, so typically all you need is just to install the latest PostgreSQL distro. Despite the mentioned requirements for "libpq" "hasql" is thoroughly tested to be compatible with a wide range of PostgreSQL servers starting from version 9.