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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Collation Needed Callbacks</h2><blockquote><pre>int sqlite3_collation_needed(
sqlite3*,
void*,
void(*)(void*,sqlite3*,int eTextRep,const char*)
);
int sqlite3_collation_needed16(
sqlite3*,
void*,
void(*)(void*,sqlite3*,int eTextRep,const void*)
);
</pre></blockquote><p>
To avoid having to register all collation sequences before a database
can be used, a single callback function may be registered with the
<a href="../c3ref/sqlite3.html">database connection</a> to be invoked whenever an undefined collation
sequence is required.</p>
<p>If the function is registered using the sqlite3_collation_needed() API,
then it is passed the names of undefined collation sequences as strings
encoded in UTF-8. If sqlite3_collation_needed16() is used,
the names are passed as UTF-16 in machine native byte order.
A call to either function replaces the existing collation-needed callback.</p>
<p>When the callback is invoked, the first argument passed is a copy
of the second argument to sqlite3_collation_needed() or
sqlite3_collation_needed16(). The second argument is the database
connection. The third argument is one of <a href="../c3ref/c_any.html">SQLITE_UTF8</a>, <a href="../c3ref/c_any.html">SQLITE_UTF16BE</a>,
or <a href="../c3ref/c_any.html">SQLITE_UTF16LE</a>, indicating the most desirable form of the collation
sequence function required. The fourth parameter is the name of the
required collation sequence.</p>
<p>The callback function should register the desired collation using
<a href="../c3ref/create_collation.html">sqlite3_create_collation()</a>, <a href="../c3ref/create_collation.html">sqlite3_create_collation16()</a>, or
<a href="../c3ref/create_collation.html">sqlite3_create_collation_v2()</a>.
</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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