added data binding traits

src/sql/statement_cache.cpp

@@ -1,14 +1,16 @@
+#include "matador/sql/connection.hpp"
 #include "matador/sql/statement_cache.hpp"
 
 namespace matador::sql {
-statement &statement_cache::acquire(const std::string &stmt, const connection &conn) {
+statement &statement_cache::acquire(query_context &&context, const connection &conn) {
   std::lock_guard<std::mutex> guard(mutex_);
-  auto key = hash_(stmt);
+  auto key = hash_(context.sql);
   auto it = statement_map_.find(key);
   if (it == statement_map_.end()) {
-
+    cache_info info {conn.prepare(std::move(context)), 1};
+//    it = statement_map_.emplace(key, {conn.prepare(std::move(context))});
   }
-  return *it->second.statement_;
+  return it->second.statement_;
 }
 
 void statement_cache::release(const statement &stmt) {