diff -r 3dfbd0b91950 -r 4cfaa02055cd src/server/plugins/postgresql/resource.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/server/plugins/postgresql/resource.h	Sat Jan 22 19:13:40 2022 +0100
@@ -0,0 +1,91 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2022 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RESOURCE_H
+#define RESOURCE_H
+
+#include "../../public/nsapi.h"
+
+#include <libpq-fe.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct PgResourcePool {
+    /*
+     * ResourcePool parameters
+     */
+    pblock *param;
+    
+    /*
+     * Cfg memorypool
+     */
+    pool_handle_t *pool;
+    
+    /*
+     * ResourcePool name
+     */
+    const char *name;
+    
+    /*
+     * connection string used for PQconnectdb
+     */
+    char *connection;
+    
+    
+} PgResourcePool;
+
+typedef struct PgResource {
+    PGconn *connection;
+} PgResource;
+    
+ResourceType* pg_get_resource_type(void);
+
+void * pg_resourcepool_init(pool_handle_t *pool, const char *rpname, pblock *pb);
+void   pg_resourcepool_destroy(PgResourcePool *pg);
+void * pg_resourcepool_createresource(PgResourcePool *pg);
+void   pg_resourcepool_freeresource(PgResourcePool *pg, PgResource *res);
+int    pg_resourcepool_prepare(PgResourcePool *pg, PgResource *res);
+int    pg_resourcepool_finish(PgResourcePool *pg, PgResource *res);
+void * pg_resourcepool_getresourcedata(PgResource *res);
+
+/*
+ * checks if conn is a working connection and logs an error message if not
+ * conn can be null (resulting in an error message)
+ * if conn is not null but the status is not CONNECTION_OK,
+ * conn will be destroyed
+ */
+int pg_check_connection(const char *rpname, PGconn *connection);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RESOURCE_H */
+