I want to interact with a MySQL database from Matlab.
I found a mysql "library" for matlab here and the same on mathworks.
I followed the instructions to compile the library and the compilation seems to be successful. I get a mex32 file at the end. Only, the instructions on the first page refer to a Dll that I need to use (I guess that a Dll was supposed to be generated).
I am not familiar with the mex compiler or with compiling external modules for Matlab.
Am I missing something trivial? Where is the Dll supposed to be?
Thanks.
The reference to the dll is obsolete.
When you compile a mex function on Windows, you compile it as a dll (not an .exe). Thus, compiled mex functions used to have the extension .dll. Mex-functions with .dll extensions still work, but there is a warning that this might stop being the case in the future.
When 64-bit Windows arrived, TheMathWorks needed a way that people were to be able to compile the same mex-function for both Win32 and Win64, thus they changed the extension to .mexw32 and .mexw64, respectively. Apparently, they did not update the documentation completely.
I'd recommend using java to connect MATLAB and MySQL (or any other db if required).
The java database connector is simple to set up. I built a simple java class to connect to the database - see previous posting for a crude but working solution.
The MATLAB code works as indicated
% include java class
import Jam.ConnectToDatabase
% set up database connection info
userName='myName';
userPassword='myPassword';
databaseUrl='jdbc:mysql://glnd2818898.internal.net/2000';
% create java class instance and open connection to the database
ctd = ConnectToDatabase;
ctd.openConnection(userName, userPassword, databaseUrl)
Once the connection is open I can then use the java methods to submit SQL queries, create tables, insert data etc. I'd never used java before but I downloaded Netbeans and I was away.
OK, here is the solution to my problem.
The compilation does generate a mex32 file (32 is because I compiled it under a 32bit systme). You can check the output file of the compilation by running mexext. So apparently a mex32 file is a compiled version of the C file.
Once I placed the file in a directory that is in the Matlab's path it worked.
I guess the reference to the Dll in the link I provided is either obsolete or wrong.
Related
For 2 weeks I'm looking for a proper tutorial on how to fully install the library "lib_mysqludf_sys".
I got the .dll from a Russian site, because there seems to be no other for 64bit systems. I have successfully installed the procedure and also created the function, but whenever I want to call a file the whole database crashes. I conclude that the DLL file is faulty or that I forgot something to install.
can someone please explain to me how to use the UDF library to call files on a Windows Server 2016 64bit properly implied in the MySQL?
that would help me a lot, thank you!
Download the Windows 64 bit version from here:
https://github.com/rapid7/metasploit-framework/tree/master/data/exploits/mysql
Copy it to here or equivalent for your MySQL installation:
c:\Program Files\MySQL\MySQL Server 5.7\lib\plugin\lib_mysqludf_sys_64.dll
Install and verify as per the instructions here:
https://osandamalith.com/2018/02/11/mysql-udf-exploitation/
Looks like you are using MySQL 57/earlier version. For the library, I suggest to control it with "dependency walker". See if there is any problem with dependency libraries. At lease KERNEL32.DLL and MSCVTR.DLL (Visual C++ Redistrubatable file) should be there without any warning on root level.
If you have the code, I suggest you to recompile it with mygwin64. There are many items needs to be fixed to compiled it. Following link is a good link for UDF DLL compiles
https://github.com/esabilbulbul/mysql-udf-windows
There something similar, follow my answer here
stackoverflow.com/a/65209718/10026099
I get the following error when I try to build my first GPU Program. Any suggestions what might be going wrong?
Error 1 error MSB4062: The "Nvda.Build.CudaTasks.SanitizePaths" task
could not be loaded from the assembly C:\Program
Files\MSBuild\Microsoft.Cpp\v4.0\BuildCustomizations\Nvda.Build.CudaTasks.dll.
Could not load file or assembly 'file:///C:\Program
Files\MSBuild\Microsoft.Cpp\v4.0\BuildCustomizations\Nvda.Build.CudaTasks.dll'
or one of its dependencies. The system cannot find the file specified.
Confirm that the declaration is correct, that the assembly
and all its dependencies are available, and that the task contains a
public class that implements
Microsoft.Build.Framework.ITask. C:\Program
Files\MSBuild\Microsoft.Cpp\v4.0\BuildCustomizations\CUDA
3.2.targets 70 4 gpu
I have faced with this problem. So many searching on internet but I could not find anything. At last I recognize that I closed Microsoft .NET Framework 3.5.1 features on Windows Features section in Control Panel.
to turn on Microsoft .Net Framework 3.5.1, you can easily follow these instructions;
http://www.sevenforums.com/tutorials/5023-windows-features-turn-off.html.
I hope this solution will help you !
I've come across this problem after upgrading my system to windows 10. It turns out that I have to reinstall Visual Studio because some dependent dlls have been moved to Windows.old folder.
I had this same error when I was compiling on a remote server. I think it was because I was logged in using Remote Desktop (RDP). When I logged in using VNC and compiled, the error no longer happened.
Note that it's impossible to even install the CUDA Toolkit via RDP, so this is unlikely to happen, unless you regularly use both methods to connect to a server.
I compiled MySQL++ with no issues. When I launched some of the executables (resetdb.exe and simple1.exe) they suggest to run to test if the installation has been successful, the first error I got was that libmysql.dll was missing.
Adding its path to the PATH environment variable did not fix the problem, even after launching a new command prompt; I had to copy the DLL in the directory where MySQL++ executables are.
Now the DLL is found, but I get this error:
simple1.exe - Application error
The application was unable to start correctly (0xc000007b).
Click OK to close the application.
even launching from the command line, I get no more information than these.
Thank you for any help!
MySQL 5.5 -
MySQL++ 3.0.9 -
Windows 7 64 bits -
MINGW32 -
GCC 4.4.0
0xC000007B is a Windows error that means the executable is corrupted. It could refer either to simple1.exe or to one of the DLLs it's linking against.
Some reasons this could happen:
You're mixing toolchains in an incompatible way. In your case, you may have built simple1.exe using pieces built by MinGW GCC and pieces built by Visual C++. MinGW should be compatible with any pure C DLL built by Visual C++, including the MySQL C API DLL. However, you may have other pieces interfering. MinGW isn't compatible with VC++ at the C++ level, but then, it shouldn't have linked at all if this were your problem.
You didn't follow the MySQL C API import library build steps in README-MinGW.txt. You either missed a step, or skipped it entirely and are trying to use the import library that shipped with MySQL.
In your previous gyrations, you ended up with a corrupt object file, which got linked in. Try saying make clean all at the top level of MySQL++ to force a complete rebuild.
You're mixing versions of MySQL or MySQL++. If you have more than one version of each on the system, make sure you're consistent in their use. That is, build the C API import library from the same DLL you run the programs against, use exrun.bat to run the examples to ensure you're using the just-built version of the MySQL++ DLL instead of another you have in your PATH, etc.
Additionally, I note that you're using an older version of MySQL++. If you were on Linux, I could understand that as some distributions still ship with 3.0.9. But since you have to build MySQL++ from source with MinGW, I don't see why you're not using 3.1.0. Did you get a binary build from somewhere?
As for your PATH problem, did you restart the MinGW shell after doing this? PATH updates don't affect running programs; they keep the value they saw when they started.
I'm trying to setting up a mySql connection using Matlab, I have read I few tutorial but unfortunately I can't get work of them. I had tried to compile the source(.cpp) but I got the following error:
Error: Could not detect a compiler on local system
which can compile the specified input file(s)
C:\PROGRA~1\MATLAB\R2010B\BIN\MEX.PL: Error: No compiler options file could be found to compile source code. Please run "mex -setup" to rectify.
So I I typed "mex -setup"
Please choose your compiler for building external interface (MEX) files:
Would you like mex to locate installed compilers [y]/n? y
Select a compiler:
[0] None
Compiler:
but there is no compiler.
Anybody can help me, how can I make a connection between matlab and mysql, I'm using windows 7 64 bit and Matlab 2010b.
I already installed wampserver.
Have you tried to establish MySQL connection from MATLAB using JBCC connector?
I did it successfully and put the complete workflow with the code example (requires Database Toolbox) in this question:
connection of MATLAB 7.0 and MYSQL
Haven't try on 64-bit though. Please let me know if it will fail.
UPDATE
You can also try the following submissions to File Exchange that do not require the Database toolbox:
queryMySQL
Access a MySQL database
I'm guessing you installed Matlab 64-bit as well, which does NOT come with a built-in MEX compiler (32-bit version uses lcc). You have a few options, but the easiest is to install Visual C++ Express (it's free! http://www.microsoft.com/express/Windows/) which will give you a 64-bit compatible compiler in the mex -setup listing. You'll have to double check which versions of the compiler 2010b is compatible with though.
Caveat: I tried this once and couldn't get it to work, but it was with like 2007b or something, and I didn't try that hard, I just installed 32-bit Matlab.
I'm getting this error while trying to run sample codes in CUDA SDK. I have CUDA 2.3 and Visual studio 2008
LINK : fatal error LNK1181: cannot open input file 'cutil32D.lib'
Any pointers how to solve this?
Since you're compiling the SDK samples, the project files are probably correct. Far more likely is that you haven't built the cutil library. Go to the SDK install directory, then into the "C" directory. You'll see a "common" directory, in there open the cutil.sln solution (or cutil_vc90.sln for VS2008) and build it in release and debug modes for your platform.
Then try your sample again.
The cutil library is used to avoid replicating the same code through all the samples, if you're starting your own project I'd avoid reusing the cutil library and write your own checker. For example, you should probably fail gracefully if you detect a CUDA error rather than just calling exit() as done in cutil.
The cuda.rules file included in the SDK is highly recommended! Using this you can just add .cu files to any project and Visual Studio will know how to compile them and link them in to the final executable. Easy!
Your MSVC project needs to include the library cutil32D.lib to link. Once you specify it as a library the linker needs to include in the final binary artifact this problem will go away. It would seem the library is missing at the location the linker is going to look for it. You'll have to change the library search paths or move that file to a directory in which the linker is already looking.
I ran into the same issue. It turned out not only did I need to build the cutil project but also the shrUtils project under the SDK's shared folder.