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+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Collation Needed Callbacks</h2>
+</div>
+<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="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+