From: Christian Grothoff <christian@grothoff.org>
Date: Tue, 19 Feb 2019 00:51:02 +0000 (+0100)
Subject: fix possibility of NULL result for empty database
X-Git-Tag: v0.11.0~63^2~32^2~27
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=472250336a3732a1afdd7d2f53386a650b812502;p=oweals%2Fgnunet.git

fix possibility of NULL result for empty database
---

diff --git a/src/datastore/plugin_datastore_postgres.c b/src/datastore/plugin_datastore_postgres.c
index 94db6e116..0a3018411 100644
--- a/src/datastore/plugin_datastore_postgres.c
+++ b/src/datastore/plugin_datastore_postgres.c
@@ -11,7 +11,7 @@
      WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      Affero General Public License for more details.
-    
+
      You should have received a copy of the GNU Affero General Public License
      along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
@@ -153,7 +153,11 @@ init_connection (struct Plugin *plugin)
                             "SELECT hash FROM gn090",
                             0),
     GNUNET_PQ_make_prepare ("estimate_size",
-                            "SELECT SUM(LENGTH(value))+256*COUNT(*) AS total FROM gn090",
+                            "SELECT CASE WHEN NOT EXISTS"
+                            "  (SELECT 1 FROM gn090)"
+                            "  THEN 0"
+                            "  ELSE (SELECT SUM(LENGTH(value))+256*COUNT(*) FROM gn090)"
+                            "END AS total",
                             0),
     GNUNET_PQ_PREPARED_STATEMENT_END
   };