Here is a list of all files with brief descriptions:

zdb
Connection.h	A Connection represents a connection to a SQL database system
ConnectionPool.h	A ConnectionPool represents a database connection pool
Exception.h	An Exception indicates an error condition from which recovery may be possible
PreparedStatement.h	A PreparedStatement represents a single SQL statement pre-compiled into byte code for later execution
ResultSet.h	A ResultSet represents a database result set
SQLException.h	Signals that an SQL specific exception has occurred
SQLState.h	SQLState provides PostgreSQL error codes for use with libzdb
URL.h	URL represents an immutable Uniform Resource Locator
zdb.h	Include this interface in your C code to import the libzdb API