<p>As required by the underlying driver. Typically this will be
used to pass whatever cannot be defaulted amongst username,
password, database name, hostname and port number for connection.</p>
+ <p>Connection string parameters for current drivers include:</p>
+ <dl>
+ <dt>MySQL</dt>
+ <dd>host, port, user, pass, dbname, sock</dd>
+ <dt>Oracle</dt>
+ <dd>user, pass, dbname, server</dd>
+ <dt>PostgreSQL</dt>
+ <dd>The connection string is passed straight through to <code>PQconnectdb</code></dd>
+ <dt>SQLite2</dt>
+ <dd>The connection string is split on a colon, and <code>part1:part2</code> is used as <code>sqlite_open(part1, atoi(part2), NULL)</code></dd>
+ <dt>SQLite3</dt>
+ <dd>The connection string is passed straight through to <code>sqlite3_open</code></dd>
+ </dl>
</usage>
</directivesynopsis>