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diff --git a/modules/database/mod_dbd.h b/modules/database/mod_dbd.h
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file  mod_dbd.h
+ * @brief Database Access Extension Module for Apache
+ *
+ * Overview of what this is and does:
+ * http://www.apache.org/~niq/dbd.html
+ * or
+ * http://apache.webthing.com/database/
+ *
+ * @defgroup MOD_DBD mod_dbd
+ * @ingroup APACHE_MODS
+ * @{
+ */
+
+#ifndef DBD_H
+#define DBD_H
+
+/* Create a set of DBD_DECLARE(type), DBD_DECLARE_NONSTD(type) and
+ * DBD_DECLARE_DATA with appropriate export and import tags for the platform
+ */
+#if !defined(WIN32)
+#define DBD_DECLARE(type)            type
+#define DBD_DECLARE_NONSTD(type)     type
+#define DBD_DECLARE_DATA
+#elif defined(DBD_DECLARE_STATIC)
+#define DBD_DECLARE(type)            type __stdcall
+#define DBD_DECLARE_NONSTD(type)     type
+#define DBD_DECLARE_DATA
+#elif defined(DBD_DECLARE_EXPORT)
+#define DBD_DECLARE(type)            __declspec(dllexport) type __stdcall
+#define DBD_DECLARE_NONSTD(type)     __declspec(dllexport) type
+#define DBD_DECLARE_DATA             __declspec(dllexport)
+#else
+#define DBD_DECLARE(type)            __declspec(dllimport) type __stdcall
+#define DBD_DECLARE_NONSTD(type)     __declspec(dllimport) type
+#define DBD_DECLARE_DATA             __declspec(dllimport)
+#endif
+
+#include <httpd.h>
+#include <apr_optional.h>
+#include <apr_hash.h>
+#include <apr_hooks.h>
+
+typedef struct {
+    server_rec *server;
+    const char *name;
+    const char *params;
+    int persist;
+#if APR_HAS_THREADS
+    int nmin;
+    int nkeep;
+    int nmax;
+    int exptime;
+    int set;
+#endif
+    apr_hash_t *queries;
+    apr_array_header_t *init_queries;
+} dbd_cfg_t;
+
+typedef struct {
+    apr_dbd_t *handle;
+    const apr_dbd_driver_t *driver;
+    apr_hash_t *prepared;
+    apr_pool_t *pool;
+} ap_dbd_t;
+
+/* Export functions to access the database */
+
+/* acquire a connection that MUST be explicitly closed.
+ * Returns NULL on error
+ */
+DBD_DECLARE_NONSTD(ap_dbd_t*) ap_dbd_open(apr_pool_t*, server_rec*);
+
+/* release a connection acquired with ap_dbd_open */
+DBD_DECLARE_NONSTD(void) ap_dbd_close(server_rec*, ap_dbd_t*);
+
+/* acquire a connection that will have the lifetime of a request
+ * and MUST NOT be explicitly closed.  Return NULL on error.
+ * This is the preferred function for most applications.
+ */
+DBD_DECLARE_NONSTD(ap_dbd_t*) ap_dbd_acquire(request_rec*);
+
+/* acquire a connection that will have the lifetime of a connection
+ * and MUST NOT be explicitly closed.  Return NULL on error.
+ * This is the preferred function for most applications.
+ */
+DBD_DECLARE_NONSTD(ap_dbd_t*) ap_dbd_cacquire(conn_rec*);
+
+/* Prepare a statement for use by a client module during
+ * the server startup/configuration phase.  Can't be called
+ * after the server has created its children (use apr_dbd_*).
+ */
+DBD_DECLARE_NONSTD(void) ap_dbd_prepare(server_rec*, const char*, const char*);
+
+/* Also export them as optional functions for modules that prefer it */
+APR_DECLARE_OPTIONAL_FN(ap_dbd_t*, ap_dbd_open, (apr_pool_t*, server_rec*));
+APR_DECLARE_OPTIONAL_FN(void, ap_dbd_close, (server_rec*, ap_dbd_t*));
+APR_DECLARE_OPTIONAL_FN(ap_dbd_t*, ap_dbd_acquire, (request_rec*));
+APR_DECLARE_OPTIONAL_FN(ap_dbd_t*, ap_dbd_cacquire, (conn_rec*));
+APR_DECLARE_OPTIONAL_FN(void, ap_dbd_prepare, (server_rec*, const char*, const char*));
+
+APR_DECLARE_EXTERNAL_HOOK(dbd, DBD, apr_status_t, post_connect,
+                          (apr_pool_t *, dbd_cfg_t *, ap_dbd_t *))
+
+#endif
+/** @} */
+