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+<!-- keywords: sqlite3_get_clientdata sqlite3_set_clientdata -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Database Connection Client Data</h2>
+</div>
+<blockquote><pre>
+void *sqlite3_get_clientdata(sqlite3*,const char*);
+int sqlite3_set_clientdata(sqlite3*, const char*, void*, void(*)(void*));
+</pre></blockquote>
+<p>
+These functions are used to associate one or more named pointers
+with a <a href="../c3ref/sqlite3.html">database connection</a>.
+A call to sqlite3_set_clientdata(D,N,P,X) causes the pointer P
+to be attached to <a href="../c3ref/sqlite3.html">database connection</a> D using name N.  Subsequent
+calls to sqlite3_get_clientdata(D,N) will return a copy of pointer P
+or a NULL pointer if there were no prior calls to
+sqlite3_set_clientdata() with the same values of D and N.
+Names are compared using strcmp() and are thus case sensitive.</p>
+
+<p>If P and X are both non-NULL, then the destructor X is invoked with
+argument P on the first of the following occurrences:
+<ul>
+<li> An out-of-memory error occurs during the call to
+sqlite3_set_clientdata() which attempts to register pointer P.
+<li> A subsequent call to sqlite3_set_clientdata(D,N,P,X) is made
+with the same D and N parameters.
+<li> The database connection closes.  SQLite does not make any guarantees
+about the order in which destructors are called, only that all
+destructors will be called exactly once at some point during the
+database connection closing process.
+</ul></p>
+
+<p>SQLite does not do anything with client data other than invoke
+destructors on the client data at the appropriate time.  The intended
+use for client data is to provide a mechanism for wrapper libraries
+to store additional information about an SQLite database connection.</p>
+
+<p>There is no limit (other than available memory) on the number of different
+client data pointers (with different names) that can be attached to a
+single database connection.  However, the implementation is optimized
+for the case of having only one or two different client data names.
+Applications and wrapper libraries are discouraged from using more than
+one client data name each.</p>
+
+<p>There is no way to enumerate the client data pointers
+associated with a database connection.  The N parameter can be thought
+of as a secret key such that only code that knows the secret key is able
+to access the associated data.</p>
+
+<p>Security Warning:  These interfaces should not be exposed in scripting
+languages or in other circumstances where it might be possible for an
+an attacker to invoke them.  Any agent that can invoke these interfaces
+can probably also take control of the process.</p>
+
+<p>Database connection client data is only available for SQLite
+version 3.44.0 (2023-11-01) and later.</p>
+
+<p>See also: <a href="../c3ref/get_auxdata.html">sqlite3_set_auxdata()</a> and <a href="../c3ref/get_auxdata.html">sqlite3_get_auxdata()</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>
+