[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

Solution 1:

1. In reference to the error: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified.

   That error means that the Data Source Name (DSN) you are specifying in your connection configuration is not being found in the windows registry.

   • It is important that your ODBC driver's executable and linking format (ELF) is the same as your application. In other words, you need a 32-bit driver for a 32-bit application or a 64-bit driver for a 64-bit application.

     If these do not match, it is possible to configure a DSN for a 32-bit driver and when you attempt to use that DSN in a 64-bit application, the DSN won't be found because the registry holds DSN information in different places depending on ELF (32-bit versus 64-bit).

     Be sure you are using the correct ODBC Administrator tool. On 32-bit and 64-bit Windows, the default ODBC Administrator tool is in c:\Windows\System32\odbcad32.exe. However, on a 64-bit Windows machine, the default is the 64-bit version. If you need to use the 32-bit ODBC Administrator tool on a 64-bit Windows system, you will need to run the one found here: C:\Windows\SysWOW64\odbcad32.exe

     Where I see this tripping people up is when a user uses the default 64-bit ODBC Administrator to configure a DSN; thinking it is for a 32-bit DSN. Then when the 32-bit application attempts to connect using that DSN, "Data source not found..." occurs.

   • It's also important to make sure the spelling of the DSN matches that of the configured DSN in the ODBC Administrator. One letter wrong is all it takes for a DSN to be mismatched.

     Here is an article that may provide some additional details

     It may not be the same product brand that you have, however; it is a generic problem that is encountered when using ODBC data source names.

2. In reference to the OLE DB Provider portion of your question, it appears to be a similar type of problem where the application is not able to locate the configuration for the specified provider.

Solution 2:

Got this error because I had the Data Source Name in User DSN instead of System DSN

Solution 3:

The Problem might be from the driver name for example instead of DRIVER={MySQL ODBC 5.3 Driver} try DRIVER={MySQL ODBC 5.3 Unicode Driver} you can see the name of the driver from administration tool

Solution 4:

In my case, it was working in x86 but not in x64.

It quite ridiculous, but in x64 the following change had to be added before it would work:

x86 -> szDsn = "DRIVER={MICROSOFT ACCESS DRIVER (*.mdb)};
x64 -> szDsn = "DRIVER={MICROSOFT ACCESS DRIVER (*.mdb, *.accdb)};

Note the addition of *.accdb.