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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Obtain Values For URI Parameters</h2><blockquote><pre>const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam);
int sqlite3_uri_boolean(const char *zFile, const char *zParam, int bDefault);
sqlite3_int64 sqlite3_uri_int64(const char*, const char*, sqlite3_int64);
</pre></blockquote><p>
These are utility routines, useful to VFS implementations, that check
to see if a database file was a URI that contained a specific query
parameter, and if so obtains the value of that query parameter.</p>
<p>If F is the database filename pointer passed into the xOpen() method of
a VFS implementation when the flags parameter to xOpen() has one or
more of the <a href="../c3ref/c_open_autoproxy.html">SQLITE_OPEN_URI</a> or <a href="../c3ref/c_open_autoproxy.html">SQLITE_OPEN_MAIN_DB</a> bits set and
P is the name of the query parameter, then
sqlite3_uri_parameter(F,P) returns the value of the P
parameter if it exists or a NULL pointer if P does not appear as a
query parameter on F. If P is a query parameter of F
has no explicit value, then sqlite3_uri_parameter(F,P) returns
a pointer to an empty string.</p>
<p>The sqlite3_uri_boolean(F,P,B) routine assumes that P is a boolean
parameter and returns true (1) or false (0) according to the value
of P. The sqlite3_uri_boolean(F,P,B) routine returns true (1) if the
value of query parameter P is one of "yes", "true", or "on" in any
case or if the value begins with a non-zero number. The
sqlite3_uri_boolean(F,P,B) routines returns false (0) if the value of
query parameter P is one of "no", "false", or "off" in any case or
if the value begins with a numeric zero. If P is not a query
parameter on F or if the value of P is does not match any of the
above, then sqlite3_uri_boolean(F,P,B) returns (B!=0).</p>
<p>The sqlite3_uri_int64(F,P,D) routine converts the value of P into a
64-bit signed integer and returns that integer, or D if P does not
exist. If the value of P is something other than an integer, then
zero is returned.</p>
<p>If F is a NULL pointer, then sqlite3_uri_parameter(F,P) returns NULL and
sqlite3_uri_boolean(F,P,B) returns B. If F is not a NULL pointer and
is not a database file pathname pointer that SQLite passed into the xOpen
VFS method, then the behavior of this routine is undefined and probably
undesirable.
</p><p>See also lists of
<a href="objlist.html">Objects</a>,
<a href="constlist.html">Constants</a>, and
<a href="funclist.html">Functions</a>.</p>
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