--- a/OrthancServer/SQLiteDatabaseWrapper.cpp	Thu Jan 03 10:06:42 2019 +0100
+++ b/OrthancServer/SQLiteDatabaseWrapper.cpp	Thu Jan 03 12:47:17 2019 +0100
@@ -1132,6 +1132,11 @@
       return "?";
     }
     
+    virtual std::string FormatResourceType(ResourceType level)
+    {
+      return boost::lexical_cast<std::string>(level);
+    }
+
     void Bind(SQLite::Statement& statement) const
     {
       size_t pos = 0;

--- a/OrthancServer/Search/DatabaseConstraint.cpp	Thu Jan 03 10:06:42 2019 +0100
+++ b/OrthancServer/Search/DatabaseConstraint.cpp	Thu Jan 03 12:47:17 2019 +0100
@@ -176,7 +176,7 @@
     mandatory_(constraint.isMandatory)
   {
     if (constraintType_ != ConstraintType_List &&
-        values_.size() != 1)
+        constraint.valuesCount != 1)
     {
       throw OrthancException(ErrorCode_ParameterOutOfRange);
     }
@@ -185,6 +185,7 @@
 
     for (uint32_t i = 0; i < constraint.valuesCount; i++)
     {
+      assert(constraint.values[i] != NULL);
       values_[i].assign(constraint.values[i]);
     }
   }
@@ -223,6 +224,13 @@
   {
     memset(&constraint, 0, sizeof(constraint));
     
+    tmpValues.resize(values_.size());
+
+    for (size_t i = 0; i < values_.size(); i++)
+    {
+      tmpValues[i] = values_[i].c_str();
+    }
+
     constraint.level = Plugins::Convert(level_);
     constraint.tagGroup = tag_.GetGroup();
     constraint.tagElement = tag_.GetElement();
@@ -231,13 +239,7 @@
     constraint.isMandatory = mandatory_;
     constraint.type = Plugins::Convert(constraintType_);
     constraint.valuesCount = values_.size();
-
-    tmpValues.resize(values_.size());
-
-    for (size_t i = 0; i < values_.size(); i++)
-    {
-      tmpValues[i] = values_[i].c_str();
-    }
+    constraint.values = (tmpValues.empty() ? NULL : &tmpValues[0]);
   }
 #endif    
 }

--- a/OrthancServer/Search/ISqlLookupFormatter.cpp	Thu Jan 03 10:06:42 2019 +0100
+++ b/OrthancServer/Search/ISqlLookupFormatter.cpp	Thu Jan 03 12:47:17 2019 +0100
@@ -260,12 +260,6 @@
                                   ResourceType queryLevel,
                                   size_t limit)
   {
-    for (size_t i = 0; i < lookup.size(); i++)
-    {
-      std::cout << i << ": " << lookup[i].GetTag() << " - " << EnumerationToString(lookup[i].GetLevel());
-      std::cout << std::endl;
-    }
-    
     assert(ResourceType_Patient < ResourceType_Study &&
            ResourceType_Study < ResourceType_Series &&
            ResourceType_Series < ResourceType_Instance);
@@ -336,7 +330,7 @@
     }
       
     sql += (joins + " WHERE " + FormatLevel(queryLevel) + ".resourceType = " +
-            boost::lexical_cast<std::string>(queryLevel) + comparisons);
+            formatter.FormatResourceType(queryLevel) + comparisons);
 
     if (limit != 0)
     {

--- a/OrthancServer/Search/ISqlLookupFormatter.h	Thu Jan 03 10:06:42 2019 +0100
+++ b/OrthancServer/Search/ISqlLookupFormatter.h	Thu Jan 03 12:47:17 2019 +0100
@@ -47,6 +47,8 @@
 
     virtual std::string GenerateParameter(const std::string& value) = 0;
 
+    virtual std::string FormatResourceType(ResourceType level) = 0;
+
     static void Apply(std::string& sql,
                       ISqlLookupFormatter& formatter,
                       const std::vector<DatabaseConstraint>& lookup,

--- a/Plugins/Engine/OrthancPluginDatabase.cpp	Thu Jan 03 10:06:42 2019 +0100
+++ b/Plugins/Engine/OrthancPluginDatabase.cpp	Thu Jan 03 12:47:17 2019 +0100
@@ -1059,7 +1059,8 @@
         }
         else
         {
-          const OrthancPluginChange& change = *reinterpret_cast<const OrthancPluginChange*>(answer.valueGeneric);
+          const OrthancPluginChange& change =
+            *reinterpret_cast<const OrthancPluginChange*>(answer.valueGeneric);
           assert(answerChanges_ != NULL);
           answerChanges_->push_back
             (ServerIndexChange(change.seq,
@@ -1113,6 +1114,8 @@
           throw OrthancException(ErrorCode_DatabasePlugin);
         }
 
+        printf("  ++ [%s]\n", match.resourceId);
+
         assert(answerMatchingResources_ != NULL);
         answerMatchingResources_->push_back(match.resourceId);
 
@@ -1176,11 +1179,10 @@
         lookup[i].EncodeForPlugins(constraints[i], constraintsValues[i]);
       }
 
+      ResetAnswers();
       answerMatchingResources_ = &resourcesId;
       answerMatchingInstances_ = instancesId;
       
-      ResetAnswers();
-
       CheckSuccess(extensions_.lookupResources(GetContext(), payload_, lookup.size(),
                                                (lookup.empty() ? NULL : &constraints[0]),
                                                Plugins::Convert(queryLevel),