From 99b4caf61c1a32fdae011fcc701f70324addb838 Mon Sep 17 00:00:00 2001
From: bert hubert <bert.hubert@netherlabs.nl>
Date: Wed, 9 Jan 2019 10:30:59 +0100
Subject: [PATCH] enhance multi test a bit

---
 lmdb-safe.hh     |  4 ++++
 multi-example.cc | 24 +++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/lmdb-safe.hh b/lmdb-safe.hh
index 3db532f..baebf45 100644
--- a/lmdb-safe.hh
+++ b/lmdb-safe.hh
@@ -362,6 +362,10 @@ public:
   {
     return currentlast(key, data, MDB_LAST);
   }
+  int first(MDBOutVal& key, MDBOutVal& data)
+  {
+    return currentlast(key, data, MDB_FIRST);
+  }
 
   operator MDB_cursor*&()
   {
diff --git a/multi-example.cc b/multi-example.cc
index 0a02d31..045b5e6 100644
--- a/multi-example.cc
+++ b/multi-example.cc
@@ -3,7 +3,8 @@ using namespace std;
 
 int main()
 {
-  auto env = getMDBEnv("multi",  0, 0600);
+  unlink("./multi");
+  auto env = getMDBEnv("multi",  MDB_NOSUBDIR, 0600);
   auto dbi = env->openDB("qnames", MDB_DUPSORT | MDB_CREATE);
 
   auto txn = env->getRWTransaction();
@@ -33,4 +34,25 @@ int main()
   for(int rc = cursor.find("lmdb", key, data); !rc; rc = cursor.get(key, data, MDB_NEXT_DUP)) {
     cout << key.get<string_view>() << " = " << data.get<string_view>() <<endl;    
   }
+
+  cout<<"Dump of complete database: "<<endl;
+  for(int rc = cursor.first(key, data); !rc; rc = cursor.next(key, data)) {
+    cout << key.get<string_view>() << " = " << data.get<string_view>() <<endl;    
+  }
+  cout << "Done!" <<endl;
+
+  cout << "Now going to delete 'lmdb' keys" << endl;
+
+  for(int rc = cursor.first(key, data); !rc; rc = cursor.next(key, data)) {
+    if(key.get<string_view>() == "lmdb")
+      cursor.del();
+  }
+
+  cout <<"Complete database after deleting 'lmdb' keys: " << endl;
+  
+  for(int rc = cursor.first(key, data); !rc; rc = cursor.next(key, data)) {
+    cout << key.get<string_view>() << " = " << data.get<string_view>() <<endl;    
+  }
+  
+  
 }