LocalDBGetVersionInfo Function

Article
03/08/2017

Returns information for the specified SQL Server Express LocalDB version, such as whether it exists and the full LocalDB version number (including build and release numbers).

The information is returned in the form of a struct named LocalDBVersionInfo, which has the following definition.

typedef struct _LocalDBVersionInfo  
{  
      // Contains the size of the LocalDBVersionInfo struct  
      DWORD  cbLocalDBVersionInfoSize;  
  
      // Holds the version name  
      TLocalDBVersionwszVersion;  
  
      // TRUE if the instance files exist on disk, FALSE otherwise  
      BOOL   bExists;  
  
      // Holds the LocalDB version for the instance in the format: major.minor.build.revision  
      DWORD  dwMajor;  
      DWORD  dwMinor;  
      DWORD  dwBuild;  
      DWORD  dwRevision;  
} LocalDBVersionInfo;

Header file: sqlncli.h

Syntax

HRESULT LocalDBGetVersionInfo(  
           PCWSTR wszVersionName,           PLocalDBVersionInfo pVersionInfo,           DWORD dwVersionInfoSize);

Parameters

wszVersionName
[Input] The LocalDB version name.

pVersionInfo
[Output] The buffer to store the information about the LocalDB version.

dwVersionInfoSize
[Input] Holds the size of the VersionInfo buffer.

Returns

S_OK
The function succeeded.

LOCALDB_ERROR_NOT_INSTALLED
SQL Server Express LocalDB is not installed on the computer.

LOCALDB_ERROR_INVALID_PARAMETER
One or more specified input parameters are invalid.

LOCALDB_ERROR_UNKNOWN_VERSION
The specified LocalDB version does not exist.

LOCALDB_ERROR_INTERNAL_ERROR
An unexpected error occurred. See the event log for details.

Details

The rationale behind the introduction of the struct size argument (lpVersionInfoSize) is to enable the API to return different versions of the LocalDBVersionInfostruct, effectively enabling forward and backward compatibility.

If the struct size argument (lpVersionInfoSize) matches the size of a known version of the LocalDBVersionInfostruct, that version of the struct is returned. Otherwise, LOCALDB_ERROR_INVALID_PARAMETER is returned.

A typical example of LocalDBGetVersionInfo API usage looks like this:

LocalDBVersionInfo vi;  
LocalDBVersionInfo(L"11.0", &vi, sizeof(LocalDBVersionInfo));

Remarks

For a code sample that uses LocalDB API, see SQL Server Express LocalDB Reference.

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