Add basic PGSQL connection

source/db/db.d

@@ -0,0 +1,50 @@
+module db.db;
+
+import slf4d;
+
+import ddbc.core;
+
+enum DBConnector {
+  DB_MYSQL,
+  DB_PGSQL,
+  DB_SQLITE,
+}
+
+struct DBSettings {
+  DBConnector connector;
+  string host;
+  ushort port;
+  string username;
+  string password;
+  string dbname;
+}
+
+class DB {
+  protected DBSettings m_settings;
+  protected DataSource m_ds;
+  protected Connection m_conn;
+
+  shared this(DBSettings settings) {
+    this.m_settings = settings;
+  }
+
+  static shared(DB) getDB(DBSettings settings) {
+    switch (settings.connector) {
+    case DBConnector.DB_PGSQL:
+      import db.pgsql;
+
+      debugF!"DB type is PostgreSQL";
+      return new shared PostgresDB(settings);
+
+    default:
+      throw new Exception("DB not supported");
+    }
+  }
+
+  protected abstract DataSource getDataSource();
+
+  void connect() {
+    this.m_ds = this.getDataSource();
+    this.m_conn = this.m_ds.getConnection();
+  }
+}