Add new metaData attribute giving query column names (#6)

Author: cjbj

examples/select1.js

@@ -51,5 +51,6 @@ oracledb.getConnection(
           return;
         }
         console.log(result.rows);
+        console.log(result.metaData);
       });
   });

src/njs/src/njsConnection.cpp

@@ -923,6 +923,9 @@ void Connection::Async_AfterExecute(uv_work_t *req)
         result->Set(String::New("rows"), rowArray, v8::ReadOnly);
         result->Set(String::New("outBinds"),Undefined());
         result->Set(String::New("rowsAffected"), Undefined());
+        result->Set(String::New("metaData"), Connection::GetMetaData(
+                                           executeBaton->columnNames,
+                                           executeBaton->numCols));
         break;
       case DpiStmtBegin :
       case DpiStmtDeclare :
@@ -931,13 +934,15 @@ void Connection::Async_AfterExecute(uv_work_t *req)
         result->Set(String::New("outBinds"),Connection::GetOutBinds(executeBaton),
                    v8::ReadOnly);
         result->Set(String::New("rows"), Undefined());
+        result->Set(String::New("metaData"), Undefined());
         break;
       default :
         result->Set(String::New("rowsAffected"),
                     Integer::New((unsigned int) executeBaton->rowsAffected),
 		                 v8::ReadOnly);
         result->Set(String::New("outBinds"),Undefined());
         result->Set(String::New("rows"), Undefined());
+        result->Set(String::New("metaData"), Undefined());
         break;
     }
     argv[1] = result;
@@ -953,6 +958,35 @@ void Connection::Async_AfterExecute(uv_work_t *req)
   }
 }
 
+/*****************************************************************************/
+/*
+   DESCRIPTION
+     Method to populate Metadata array
+
+   PARAMETERS:
+     columnNames - Column Names
+     numCols     - number of columns
+
+   RETURNS:
+     MetaData Handle
+*/
+Handle<Value> Connection::GetMetaData (std::string* columnNames,
+                                       unsigned int numCols )
+{
+  HandleScope scope;
+  Handle<Array> metaArray = v8::Array::New(numCols);
+  for(unsigned int i=0; i < numCols ; i++)
+  {
+    Local<Object> column = Object::New();
+    column->Set(String::New("name"),
+                String::New(columnNames[i].c_str(),
+                            (int) columnNames[i].length())
+                );
+    metaArray->Set(i, column);
+  }
+  return scope.Close(metaArray);
+}
+
 /*****************************************************************************/
 /*
    DESCRIPTION

src/njs/src/njsConnection.h

@@ -229,6 +229,8 @@ class Connection: public ObjectWrap
   static Handle<Value> GetOutBindArray ( std::vector<Bind*> binds, unsigned int outCount);
   static Handle<Value> GetOutBindObject (std::vector<Bind*> binds);
   static Handle<Value> GetRows (eBaton* executeBaton);
+  static Handle<Value> GetMetaData (std::string* columnNames,
+                                    unsigned int numCols);
   static Handle<Value> GetValue (short ind, unsigned short type, void* val,
                                  DPI_BUFLEN_TYPE len);
   static void UpdateDateValue ( eBaton *executeBaton );