Hi!
Moving my project from mysql-lited to mysql-native I faced the problem with null pointer error inside of mysql-native:

Log:
SELECT id FROM versionupdate ORDER BY id
Task terminated with unhandled exception:
etc.linux.memoryerror.NullPointerError@src/etc/linux/memoryerror.d(325)
----------------
??:? void etc.linux.memoryerror.sigsegvUserspaceProcess(void*) [0x102ebad]
??:? void etc.linux.memoryerror.sigsegvDataHandler() [0x102eaee]
../../.dub/packages/mysql-native-1.1.0/mysql-native/source/mysql/result.d:466 const(pure nothrow @property bool function()) mysql.result.ResultRange.isValid [0xdf1626]
../../.dub/packages/mysql-native-1.1.0/mysql-native/source/mysql/result.d:536 void mysql.result.ResultRange.close() [0xdf1cb8]
../../.dub/packages/mysql-native-1.1.0/mysql-native/source/mysql/result.d:460 void mysql.result.ResultRange.__dtor() [0xdf15cc]
../../.dub/packages/mysql-native-1.1.0/mysql-native/source/mysql/result.d:430 ref return mysql.result.ResultRange mysql.result.ResultRange.opAssign(mysql.result.ResultRange) [0xdf1dba]
source/vcm/sqlWrapper.d:63 mysql.result.ResultRange vcm.sqlWrapper.SqlWrapper.query!().query(immutable(char)[]) [0xdd57e3]
source/updater/manager.d:92 void updater.manager.UpdateManager.update() [0xd74886]
source/app.d:81 void app.prepareDb().__lambda1() [0xcfe740]
../../.dub/packages/vibe-d-0.7.31/vibe-d/source/vibe/core/core.d:595 void vibe.core.core.makeTaskFuncInfo!(void delegate()).makeTaskFuncInfo(ref void delegate()).callDelegate(vibe.core.core.TaskFuncInfo*) [0xc5b703]
../../.dub/packages/vibe-d-0.7.31/vibe-d/source/vibe/core/core.d:1224 void vibe.core.core.CoreTask.run() [0xf6a916]
??:? void core.thread.Fiber.run() [0x107f17b]
??:? fiber_entryPoint [0x107eede]
??:? [0xffffffff]

Code fragment:
		string s = Sql(sqlString, args).toString!MysqlDialect;
		writeln(s);stdout.flush; // debugging...

		if(conn.__conn() is null) // debugging...
			throw new Exception("connection is null");
		
		ResultRange result;
		// synchronized (mutex)
			result = conn.query(s);  // <-- sqlWrapper.d:63 is here

It seems I am doing something wrong so myself-native fails to detect it in isValid(). So I search for example how to use mysql-native in real multi-threaded vibe.d application with usage of MySQLPool. Please do not point me to basic example provided with package because it is single thread.
Thanks.

On Friday, 30 June 2017 at 00:52:28 UTC, crimaniak wrote:
> Hi!
> Moving my project from mysql-lited to mysql-native I faced the problem with null pointer error inside of mysql-native:
>
[...]
> It seems I am doing something wrong so myself-native fails to detect it in isValid(). So I search for example how to use mysql-native in real multi-threaded vibe.d application with usage of MySQLPool. Please do not point me to basic example provided with package because it is single thread.
> Thanks.
Sorry, can not help, but would be very interested to learn how to do a

         real multi-threaded vibe.d with mysql

So if you find a solution, please make an simplified example for vibe.d documentation!
Sönke might include it into vibe.d docs.

On Friday, 30 June 2017 at 00:52:28 UTC, crimaniak wrote:
> Hi!
> Moving my project from mysql-lited to mysql-native I faced the problem with null pointer error inside of mysql-native:
>

seems like it's already fixed https://github.com/mysql-d/mysql-native/commit/477636ad944442a15d504308d1893f987685cd71

On Friday, 30 June 2017 at 16:18:33 UTC, tetyys wrote:
> On Friday, 30 June 2017 at 00:52:28 UTC, crimaniak wrote:
>> Hi!
>> Moving my project from mysql-lited to mysql-native I faced the problem with null pointer error inside of mysql-native:
>>
>
> seems like it's already fixed https://github.com/mysql-d/mysql-native/commit/477636ad944442a15d504308d1893f987685cd71

Yes, this is relevant fix. Thanks!