通过 MacOS X 环境中的 Virtuoso ODBC/iODBC 将 Redland 连接到 Virtuoso

为了在我的MacOS X环境中安装Virtuoso，我使用了brew端口，即:

brew install virtuoso

通过这样做，它自动安装了一些ODBC/iODBC驱动程序，这些驱动程序不能被任何其他unixodbc设置覆盖。特别是如果我试图链接这样的库:

$ brew link unixodbc
Linking /usr/local/Cellar/unixodbc/2.3.4...
Error: Could not symlink bin/isql
Target /usr/local/bin/isql
is a symlink belonging to virtuoso. You can unlink it:
  brew unlink virtuoso
To force the link and overwrite all conflicting files:
  brew link --overwrite unixodbc
To list all files that would be deleted:
  brew link --overwrite --dry-run unixodbc

顺便说一下，我不想取消这个版本的链接。所以我试着从头开始编译Redland并从GitHub下载。特别地，我使用了两种可能的配置:

env PKG_CONFIG_PATH=/usr/local/lib/pkgconfig ./configure --with-virtuoso --with-odbc=/usr/local/Cellar/virtuoso/7.2.4.2
env PKG_CONFIG_PATH=/usr/local/lib/pkgconfig ./configure --with-virtuoso --with-iodbc=/usr/local/Cellar/virtuoso/7.2.4.2

在我的项目中手动添加rdf_hash_internal.h和rdf_heuristics.h后，一切都很顺利，一切都得到了编译和链接。在我的c++应用程序中，我试图使用以下代码访问数据库:

world = librdf_new_world();
librdf_world_open(world);
storage = librdf_new_storage(world,"virtuoso",graphName.c_str(),"dsn='Local Virtuoso',user='dba',password='dba'");
model = librdf_new_model(world,storage,NULL);
context_node = librdf_new_node_from_uri_string(world,(const unsigned char*)defaultContext.c_str());
/* librdf_model_transaction_commit(this->super->model) */
librdf_model_size(super->model)

如果我禁用事务，无论如何，我在"rdf_storage_virtuoso.c"的第941行得到以下错误:

rc = SQLDriverConnect(connection->hdbc, 0,(UCHAR *) context->conn_str,
                      SQL_NTS, context->outdsn,
                      LIBRDF_VIRTUOSO_CONTEXT_DSN_SIZE,
                      &buflen, SQL_DRIVER_COMPLETE);

因此，我认为在ODBC/iODBC级别存在连接错误。顺便说一下，我可以用以下命令连接到virtuoso:

$ isql localhost:1111 dba dba
Connected to OpenLink Virtuoso
Driver: 07.20.3217 OpenLink Virtuoso ODBC Driver
OpenLink Interactive SQL (Virtuoso), version 0.9849b.
Type HELP; for help and EXIT; to exit.
SQL>

是否有办法连接Redland库与ODBC库由Virtuoso?

[ODBC Data Sources]
VOS = virtuoso-odbc
[VOS]
Driver = /usr/local/Cellar/virtuoso/7.2.4.2/lib/virtodbc.so
Description = Virtuoso Open-Source Edition
Address = localhost:1111
UserName    = dba
User        = dba

[ODBC Drivers]
virtuoso-odbc = Installed
[virtuoso-odbc]
Driver = /usr/local/Cellar/virtuoso/7.2.4.2/lib/virtodbc.so

storage=librdf_new_storage(world, "virtuoso","db1","dsn='VOS',user='dba',password='dba'");

./configure     --program-transform-name='s/isql$$/isql-vt/;s/isqlw/isqlw-vt/'