added sqlite db backend progress

include/matador/sql/connection_pool.hpp

@@ -40,10 +40,11 @@ template < class Connection >
 class connection_pool
 {
 public:
-  connection_pool(const std::string &db, unsigned int count) {
+  connection_pool(const std::string &dns, unsigned int count)
+  : info_(connection_info::parse(dns)) {
     connection_repo_.reserve(count);
     for (auto i = 0U; i < count; ++i) {
-      connection_repo_.emplace_back(db + std::to_string(i+1));
+      connection_repo_.emplace_back(info_);
       idle_connections_.push(&connection_repo_.back());
       idle_connections_.back()->open();
     }
@@ -87,6 +88,9 @@ public:
     return inuse_connections_.size();
   }
 
+  const connection_info &info() const {
+    return info_;
+  }
 private:
   mutable std::mutex mutex_;
   std::vector<Connection> connection_repo_;
@@ -95,6 +99,8 @@ private:
   using connection_set = std::unordered_set<pointer>;
   connections idle_connections_;
   connection_set inuse_connections_;
+
+  const connection_info info_;
 };
 
 template<class Connection>