[Bug Fix] Fix for undefined MySQL library behavior. (#2834)

* MYSQL objects cannot be copied in a well defined way, this removes the copy and replaces it with another connection

* Change to share underlying pointers.

* Push up mutex changes

* Post rebase

* Formatting

---------

Co-authored-by: KimLS <KimLS@peqtgc.com>
Co-authored-by: Akkadius <akkadius1@gmail.com>

common/dbcore.h

@@ -31,14 +31,19 @@ public:
 	std::string Escape(const std::string& s);
 	uint32 DoEscapeString(char *tobuf, const char *frombuf, uint32 fromlen);
 	void ping();
-	MYSQL *getMySQL() { return &mysql; }
-	void SetMysql(MYSQL *mysql);
 
 	const std::string &GetOriginHost() const;
 	void SetOriginHost(const std::string &origin_host);
 
 	bool DoesTableExist(std::string table_name);
 
+	void SetMySQL(const DBcore &o)
+	{
+		mysql      = o.mysql;
+		mysqlOwner = false;
+	}
+	void SetMutex(Mutex *mutex);
+
 protected:
 	bool Open(
 		const char *iHost,
@@ -55,8 +60,9 @@ protected:
 private:
 	bool Open(uint32 *errnum = nullptr, char *errbuf = nullptr);
 
-	MYSQL   mysql;
-	Mutex   MDatabase;
+	MYSQL*  mysql;
+	bool    mysqlOwner;
+	Mutex   *m_mutex;
 	eStatus pStatus;
 
 	std::mutex m_query_lock{};