具有MS Access 2016的HDBC-ODBC

Question

I am unable to understand the error I am getting when I try to connect to a MS access database file

λ: :m + Database.HDBC Database.HDBC.ODBC
λ: let connectionString = "DBQ=c:\\Users\\user\\Desktop\\Database1.accdb;Driver={Microsoft Access Driver (*.mdb, *.accdb)};"
λ: conn <- connectODBC connectionString

*** Exception: SqlError {seState = "[]", seNativeError = -1, seErrorMsg = "sqlGetInfo SQL_TXN_CAPABLE: []"}

Answer 1

I got you, buddy, even if it's probably uselessly late!

I just hit this exact issue and forked HDBC-odbc to fix it. In short: they "foolishly" trusted the MSDN documentation for SQLGetInfo , which claims that the BufferLength parameter is more-or-less ignored for non-string information types (say, the SQLUSMALLINT used when querying SQL_TXN_CAPABLE ).

Well, at least with the MS Access driver, that's not true. I tweaked the querying code to actually pass sizeof(SQLUSMALLINT) instead of zero, and things seem to be working.

The updated HDBC-odbc can be had at https://github.com/derrickturk/hdbc-odbc . I intend to put in a pull request as well, but I am not sure if HDBC-odbc is still maintained.

In any case, if you use stack , it's as easy as changing your extra-deps in stack.yaml to include (replacing any previous source of HDBC-odbc ):

extra-deps:
  - git: https://github.com/derrickturk/hdbc-odbc.git
    commit: 99cbefb16defc9ce6de77c1434207a78b5c3c365