Go 1.1.1 and ODBC with MSSQL

Question

Currently have FreeTDS 0.92.4 / unixODBC 2.3.1 up and running, connecting with a MSSQL server and able to execute queries etc.

I've found this list of ODBC implementations for Go, and have tried the two in bold:

• BenoyRNair https://github.com/BenoyRNair/godbc/
• Wei guangjing https://github.com/weigj/go-odbc
• Mark Severson https://bitbucket.org/miquella/mgodbc
• Luke Mauldin https://github.com/LukeMauldin/lodbc
• Robert Johnstone https://bitbucket.org/rj/odbc3-go/
• brainman http://code.google.com/p/odbc/

---

mgodbc

I'm getting a bunch of deprecation warnings (looking at the headers they're deprecated for OSX 10.8 and later):

cc1: warnings being treated as errors
mgodbc.go: In function 'mSQLColAttribute':
mgodbc.go:31: warning: 'SQLColAttributeW' is deprecated (declared at /usr/include/sqlucode.h:128)
mgodbc.go: At top level:
mgodbc.go:44: warning: 'SQLDisconnect' is deprecated (declared at /usr/include/sql.h:896)
mgodbc.go:51: warning: 'SQLGetDiagRecW' is deprecated (declared at /usr/include/sqlucode.h:233)
mgodbc.go:62: warning: 'SQLGetInfoW' is deprecated (declared at /usr/include/sqlucode.h:273)
mgodbc.go:67: warning: 'SQLBindParameter' is deprecated (declared at /usr/include/sqlext.h:2519)
mgodbc.go:70: warning: 'SQLDriverConnectW' is deprecated (declared at /usr/include/sqlucode.h:336)
mgodbc.go:73: warning: 'SQLSetEnvAttr' is deprecated (declared at /usr/include/sql.h:1120)
mgodbc.go:74: warning: 'SQLFreeHandle' is deprecated (declared at /usr/include/sql.h:942)
mgodbc.go:75: warning: 'SQLSetConnectAttrW' is deprecated (declared at /usr/include/sqlucode.h:245)
mgodbc.go:78: warning: 'SQLGetDiagFieldW' is deprecated (declared at /usr/include/sqlucode.h:223)
mgodbc.go:82: warning: 'SQLRowCount' is deprecated (declared at /usr/include/sql.h:1076)
mgodbc.go:98: warning: 'SQLGetData' is deprecated (declared at /usr/include/sql.h:975)
mgodbc.go:99: warning: 'SQLEndTran' is deprecated (declared at /usr/include/sql.h:902)
mgodbc.go:102: warning: 'SQLCloseCursor' is deprecated (declared at /usr/include/sql.h:831)
mgodbc.go:103: warning: 'SQLPrepareW' is deprecated (declared at /usr/include/sqlucode.h:239)
mgodbc.go:107: warning: 'SQLNumResultCols' is deprecated (declared at /usr/include/sql.h:1058)
mgodbc.go:113: warning: 'SQLAllocHandle' is deprecated (declared at /usr/include/sql.h:799)
mgodbc.go:114: warning: 'SQLExecute' is deprecated (declared at /usr/include/sql.h:921)
mgodbc.go:115: warning: 'SQLFetch' is deprecated (declared at /usr/include/sql.h:924)
mgodbc.go:119: warning: 'SQLNumParams' is deprecated (declared at /usr/include/sqlext.h:2448)

Update

Following a suggestion from mac01021, from go-nuts irc, I've added

#pragma GCC diagnostic ignored "-Wdeprecated-declarations"  

This gets rid of the deprecation warnings, but still doesn't build against the included iODBC of OS X

Replacing the above line with:

#cgo darwin CFLAGS: -I/opt/local/include 

and voila, mgodbc builds now (using the installed unixODBC)
although now a nice little segfault occurs upon import =(

---

odbc

I'm getting build errors:

# code.google.com/p/odbc/api
api/api.go:13: undefined: SQLSMALLINT  
api/api.go:14: undefined: SQLUSMALLINT  
api/api.go:15: undefined: SQLUSMALLINT  
api/api.go:19: undefined: SQLSMALLINT  
api/api.go:20: undefined: SQLUSMALLINT  
api/api.go:21: undefined: SQLUSMALLINT  
api/api.go:22: undefined: SQLUSMALLINT  
api/api.go:23: undefined: SQLUSMALLINT  
api/api.go:24: undefined: SQLUSMALLINT  
api/api.go:25: undefined: SQLUINTEGER  
api/api.go:25: too many errors  

Update

Thanks @alex for the cgo info. I've modified api_unix.go with the below

// Copyright 2012 The Go Authors. All rights reserved.  
// Use of this source code is governed by a BSD-style  
// license that can be found in the LICENSE file.  

// +build linux darwin  
// +build cgo  

package api  

// #cgo linux LDFLAGS: -lodbc  
// #cgo darwin LDFLAGS: -lodbc  
// #cgo darwin CFLAGS: -I /opt/local/include  
// #include <sql.h>  
// #include <sqlext.h>  
import "C"  

The iODBC included with OS X has some things that are listed as deprecated (and I've had better luck with unixODBC in the past)

I've added the -I /opt/local/include to the CFLAGS to, hopefully, point to the unixODBC headers, and not the ones included by Apple (which have the deprecation warnings etc.)

Running # go build -x gives me:

WORK=/var/folders/z2/k9vxn7gn6395vb3y2qc7_1040000gn/T/go-build784364461  
mkdir -p $WORK/code.google.com/p/odbc/api/_obj/  
mkdir -p $WORK/code.google.com/p/odbc/  
cd /Users/jr/Development/go/src/code.google.com/p/odbc/api  
/usr/local/go/pkg/tool/darwin_amd64/cgo -objdir $WORK/code.google.com/p/odbc/api/_obj/ -- -I /opt/local/include -I $WORK/code.google.com/p/odbc/api/_obj/ api_unix.go  
/usr/local/go/pkg/tool/darwin_amd64/6c -F -V -w -I $WORK/code.google.com/p/odbc/api/_obj/ -I /usr/local/go/pkg/darwin_amd64 -o $WORK/code.google.com/p/odbc/api/_obj/_cgo_defun.6 -D GOOS_darwin -D GOARCH_amd64 $WORK/code.google.com/p/odbc/api/_obj/_cgo_defun.c  
gcc -I . -g -O2 -fPIC -m64 -pthread -fno-common -print-libgcc-file-name
gcc -I . -g -O2 -fPIC -m64 -pthread -fno-common -I /opt/local/include -I $WORK/code.google.com/p/odbc/api/_obj/ -o $WORK/code.google.com/p/odbc/api/_obj/_cgo_main.o -c $WORK/code.google.com/p/odbc/api/_obj/_cgo_main.c  
gcc -I . -g -O2 -fPIC -m64 -pthread -fno-common -I /opt/local/include -I $WORK/code.google.com/p/odbc/api/_obj/ -o $WORK/code.google.com/p/odbc/api/_obj/_cgo_export.o -c $WORK/code.google.com/p/odbc/api/_obj/_cgo_export.c  
gcc -I . -g -O2 -fPIC -m64 -pthread -fno-common -I /opt/local/include -I $WORK/code.google.com/p/odbc/api/_obj/ -o $WORK/code.google.com/p/odbc/api/_obj/api_unix.cgo2.o -c $WORK/code.google.com/p/odbc/api/_obj/api_unix.cgo2.c  
gcc -I . -g -O2 -fPIC -m64 -pthread -fno-common -o $WORK/code.google.com/p/odbc/api/_obj/_cgo_.o $WORK/code.google.com/p/odbc/api/_obj/_cgo_main.o $WORK/code.google.com/p/odbc/api/_obj/_cgo_export.o $WORK/code.google.com/p/odbc/api/_obj/api_unix.cgo2.o -lodbc
/usr/local/go/pkg/tool/darwin_amd64/cgo -objdir $WORK/code.google.com/p/odbc/api/_obj/ -dynimport $WORK/code.google.com/p/odbc/api/_obj/_cgo_.o -dynout $WORK/code.google.com/p/odbc/api/_obj/_cgo_import.c  
/usr/local/go/pkg/tool/darwin_amd64/6c -F -V -w -I $WORK/code.google.com/p/odbc/api/_obj/ -I /usr/local/go/pkg/darwin_amd64 -o $WORK/code.google.com/p/odbc/api/_obj/_cgo_import.6 -D GOOS_darwin -D GOARCH_amd64 $WORK/code.google.com/p/odbc/api/_obj/_cgo_import.c  
gcc -I . -g -O2 -fPIC -m64 -pthread -fno-common -o $WORK/code.google.com/p/odbc/api/_obj/_all.o $WORK/code.google.com/p/odbc/api/_obj/_cgo_export.o $WORK/code.google.com/p/odbc/api/_obj/api_unix.cgo2.o -Wl,-r -nostdlib /usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/x86_64/libgcc.a  
/usr/local/go/pkg/tool/darwin_amd64/6g -o $WORK/code.google.com/p/odbc/api/_obj/_go_.6 -p code.google.com/p/odbc/api -D _/Users/jr/Development/go/src/code.google.com/p/odbc/api -I $WORK ./api.go $WORK/code.google.com/p/odbc/api/_obj/_cgo_gotypes.go $WORK/code.google.com/p/odbc/api/_obj/api_unix.cgo1.go  
/usr/local/go/pkg/tool/darwin_amd64/pack grcP $WORK $WORK/code.google.com/p/odbc/api.a $WORK/code.google.com/p/odbc/api/_obj/_go_.6 $WORK/code.google.com/p/odbc/api/_obj/_cgo_import.6 $WORK/code.google.com/p/odbc/api/_obj/_cgo_defun.6 $WORK/code.google.com/p/odbc/api/_obj/_all.o  
mkdir -p $WORK/code.google.com/p/odbc/_obj/  
mkdir -p $WORK/code.google.com/p/  
cd /Users/jr/Development/go/src/code.google.com/p/odbc  
/usr/local/go/pkg/tool/darwin_amd64/6g -o $WORK/code.google.com/p/odbc/_obj/_go_.6 -p code.google.com/p/odbc -complete -D _/Users/jr/Development/go/src/code.google.com/p/odbc -I $WORK -I /Users/jr/Development/go/pkg/darwin_amd64 ./column.go ./conn.go ./driver.go ./error.go ./handle.go ./odbcstmt.go ./param.go ./result.go ./rows.go ./stats.go ./stmt.go ./tx.go  
# code.google.com/p/odbc  
./column.go:22: undefined: api.SQLGetData  
./column.go:28: undefined: api.SQLBindCol  
./column.go:47: undefined: api.SQLDescribeCol  
./conn.go:20: undefined: api.SQLAllocHandle  
./conn.go:28: undefined: api.SQLDriverConnect  
./conn.go:39: undefined: api.SQLDisconnect  
./driver.go:26: undefined: api.SQLAllocHandle  
./driver.go:34: undefined: api.SQLSetEnvAttr  
./driver.go:43: undefined: api.SQLSetEnvAttr  
./driver.go:50: undefined: api.SQLSetEnvAttr  
./driver.go:50: too many errors  

It looks like the header path include is being passed correctly?
But still looks like things are not quite linking correctly?

for SQLGetData I do see a matching definition from the //sys SQLGetData... comment from api.go within /opt/local/include/sql.h

---

UPDATE

The library mentioned at the top:

brainman http://code.google.com/p/odbc/

Now works as a go-gettable package on OSX. There's even documentation to get you started with the odbc/tds portions.

Answer 1

On Windows:

>go version
go version devel +edd229b63fa4 Wed Jun 26 11:36:18 2013 -0700 windows/amd64
>go get -v code.google.com/p/odbc
code.google.com/p/odbc (download)
code.google.com/p/odbc/api
code.google.com/p/odbc
>go get -v bitbucket.org/miquella/mgodbc
bitbucket.org/miquella/mgodbc (download)
bitbucket.org/miquella/mgodbc
>

On Linux:

$ go version
go version devel +65e2aba21abe Wed Jun 26 13:14:11 2013 -0700 linux/amd64
$ sudo apt-get install unixodbc unixodbc-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
unixodbc is already the newest version.
unixodbc-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded.
$ go get -v code.google.com/p/odbc
code.google.com/p/odbc (download)
code.google.com/p/odbc/api
code.google.com/p/odbc
$ go get -v bitbucket.org/miquella/mgodbc
bitbucket.org/miquella/mgodbc (download)
bitbucket.org/miquella/mgodbc
$ 

On Darwin, you seem to have issues with SQL header files.

/usr/include/sql.h
/usr/include/sqlext.h
/usr/include/sqltypes.h
/usr/include/sqlucode.h

Contact the odbc package authors to report these problems.

UPDATE:

When you tell us about the error

mgodbc.go:180: cannot convert &state[0] (type *uint16) to type *_Ctype_SQLWCHAR  

you don't tell us what the type of _Ctype_SQLWCHAR is. We can only guess! My guess would be that it should look like this

package main

func main() {
    type _Ctype_ushort uint16
    type _Ctype_WCHAR _Ctype_ushort
    type _Ctype_SQLWCHAR _Ctype_WCHAR
    var state [6]uint16
    // (*C.SQLWCHAR)(&state[0])
    _ = (*_Ctype_SQLWCHAR)(&state[0])
}

which compiles with no errors.

UPDATE:

Use a systematic approach to problem solving.

Read about Go build contraints: Build Constraints, Package build.

Read the files in code.google.com/p/odbc/api.

Grep the files in code.google.com/p/odbc/api.

$ grep -r 'linux' *
api_unix.go:// +build linux
api_unix.go:// #cgo linux LDFLAGS: -lodbc
Makefile:   GOOS=linux ./mksyscall_unix.pl $^ \
mksyscall_unix.pl:// +build linux
mksyscall_unix.pl:// #cgo linux LDFLAGS: -lodbc
zapi_unix.go:// +build linux
zapi_unix.go:// #cgo linux LDFLAGS: -lodbc
$ 

Clearly, after reading the api_unix.go, zapi_unix.go, mksyscall_unix.pl, and Makefile files, when the api_unix.go file is modified, the zapi_unix.go file should be modified too.

You probably didn't do that. Therefore, darwin is not included in the zapi_unix.go build constraints. The package api names that you show as undefined are defined in zapi_unix.go.

api.SQLGetData
api.SQLBindCol  
api.SQLDescribeCol  
api.SQLAllocHandle  
api.SQLDriverConnect  
api.SQLDisconnect  
api.SQLAllocHandle  
api.SQLSetEnvAttr