add port option for mysql

https://github.com/moneroexamples/openmonero/issues/55#issuecomment-348398149

config/config.json

@@ -13,6 +13,7 @@
   "database" :
   {
     "url"      : "127.0.0.1",
+    "port"     : 3306,
     "dbname"   : "openmonero",
     "user"     : "root",
     "password" : "root"

main.cpp

@@ -89,10 +89,12 @@ string deamon_url = testnet
 
 // set mysql/mariadb connection details
 xmreg::MySqlConnector::url      = config_json["database"]["url"];
+xmreg::MySqlConnector::port     = config_json["database"]["port"];
 xmreg::MySqlConnector::username = config_json["database"]["user"];
 xmreg::MySqlConnector::password = config_json["database"]["password"];
 xmreg::MySqlConnector::dbname   = config_json["database"]["dbname"];
 
+
 // set blockchain status monitoring thread parameters
 xmreg::CurrentBlockchainStatus::blockchain_path
         =  blockchain_path.string();

src/MySqlConnector.cpp

@@ -16,6 +16,7 @@ namespace xmreg {
 
 
 string MySqlConnector::url;
+size_t MySqlConnector::port;
 string MySqlConnector::username;
 string MySqlConnector::password;
 string MySqlConnector::dbname;
@@ -35,7 +36,8 @@ MySqlConnector::connect()
     try
     {
         if (!conn.connect(dbname.c_str(), url.c_str(),
-                          username.c_str(), password.c_str()))
+                          username.c_str(), password.c_str(),
+                          port))
         {
             cerr << "Connection to Mysql failed!" << endl;
             return false;

src/MySqlConnector.h

@@ -42,6 +42,7 @@ class MySqlConnector
 public:
 
     static string url;
+    static size_t port;
     static string username;
     static string password;
     static string dbname;