Fix case when SQLGetData data size exceeds column size (#346)

* Fix case when SQLGetData data size exceeds column size

Fixes #328. Ok, a bit nasty, but here's the rundown:
  * This is mostly outlined [here](https://docs.microsoft.com/en-us/sql/odbc/reference/syntax/sqlgetdata-function?view=sql-server-ver16#retrieving-data-with-sqlgetdata)
  * The issue is that for our result set, the cursor may be told that a give column has a certain size in bytes, particularly for variable-sized columns like VARCHAR
  * BUT, the driver then may have to "convert to the target type" and this conversion may result in the _actual_ data size being larger than we orignally allocated for
  * But wait, you may ask, don't we already account for this case [here](https://github.com/JuliaDatabases/ODBC.jl/blob/f38f771557a5763f777ed0f441c2cc5a72f41c70/src/utils.jl#L328) by resizing the buffer and calling SQLGetData again to retrieve the rest of the data?
  * Why yes, we do, but only for "long" data types, which is the primary use case for the multiple SQLGetData calls
  * So basically this is _another_ case where, totally depending on the db driver, we might end up with truncated data which will result in `API.SQL_SUCCESS_WITH_INFO` being returned from SQLGetData

Thankfully the fix is relatively easy: we just need to use our buffer-resizing branch if the data type is long OR SQLGetData returns this success with info status code.

* bump some versions and update ci

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - 1.0
+          - 1.6
           - 1 # automatically expands to the latest stable 1.x release of Julia
           - nightly
         os:

Project.toml

@@ -1,6 +1,6 @@
 name = "ODBC"
 uuid = "be6f12e9-ca4f-5eb2-a339-a4f995cc0291"
-version = "1.0.4"
+version = "1.1.0"
 
 [deps]
 DBInterface = "a10d1c49-ce27-4219-8d33-6db1a4562965"
@@ -22,7 +22,7 @@ DecFP = "0.4.10, 1"
 Tables = "1"
 Scratch = "1"
 iODBC_jll = "3.52"
-julia = "1.5"
+julia = "1.6"
 unixODBC_jll = "2.3"
 
 [extras]

src/utils.jl

@@ -304,7 +304,7 @@ getbindings(stmt, columnar, ctypes, sqltypes, columnsizes, nullables, longtexts,
 function getdata(stmt, i, b::Binding)
     status = API.SQLGetData(API.getptr(stmt), i, b.valuetype, pointer(b.value), b.bufferlength, b.strlen_or_indptr)
     b.totallen = b.strlen_or_indptr[1]
-    if b.long && b.strlen_or_indptr[1] != API.SQL_NULL_DATA
+    if (b.long || status == API.SQL_SUCCESS_WITH_INFO) && b.strlen_or_indptr[1] != API.SQL_NULL_DATA
         chardata = b.valuetype != API.SQL_C_BINARY
         if b.strlen_or_indptr[1] == API.SQL_NO_TOTAL
             b.totallen = b.bufferlength - 1