# Interface between mongoDB and the Next Scripting Framework #

## Ingredients: ##

  https://github.com/mongodb/mongo  
  https://github.com/mongodb/mongo-c-driver  

The current version of the NSF mongo binding is 2.2 and was
tested with
- Tcl 8.5, 8.6 and 8.7
- MongoDB v3.6.5 (released May 29, 2018)
- mongodb-c-driver 1.11.0 (released June 23, 2018)
- libbson 1.11.0 (released June 23, 2018)

Follow the following steps to get MongoDB up and running
and to compile the MongoDB driver for NX.


## Obtain Mongodb and Mongo-C-Driver: ##

- Compile or obtain mongodb (the database).

- Compile or obtain the mongo-c-driver (client interface)

````
      cd /usr/local/src
      wget https://github.com/mongodb/mongo-c-driver/releases/download/1.11.0/mongo-c-driver-1.11.0.tar.gz
      tar zxvf  mongo-c-driver-1.11.0.tar.gz
      rm -rf mongo-c-driver
      ln -sf mongo-c-driver-1.11.0 mongo-c-driver
      cd mongo-c-driver
      cmake .
      make
      sudo make install
````

  Alternatively, one can get the newest version from git

````
      cd /usr/local/src
      git clone https://github.com/mongodb/mongo-c-driver
      cd mongo-c-driver
      cmake .
      make
      sudo make install
````

  If you experience errors during autogen on Debian, you might have to
      apt-get install libtool

  If configure complains about not finding bson, you might have to do
      export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

  Note: Version 1.5.1 of the c-driver leads on macOS to a crash on
  exit, when configured SASL support (from mac ports) and the flag
  "--disable-automatic-init-and-cleanup" is missing.


## Compiling the Mongo NSF Binding: ##

Assume the following installation directories

  - Tcl:             /usr/local/ns/lib/
  - mongo-c-driver: /usr/local/src/mongo-c-driver/

configure the mongodb NSF interface via the following
command in the directory nsf*/library/mongodb/
You will probably have to adjust the paths.

````
   ./configure --with-tcl=/usr/local/ns/lib/ --prefix=/usr/local/ns --with-nsf=../../ \
               --with-mongoc=/usr/local/include/libmongoc-1.0/,/usr/local/lib/ \
               --with-bson=/usr/local/include/libbson-1.0,/usr/local/lib/ \
	       --enable-threads --enable-symbols
````

In order to run the sample script,
  * first start the mongodb (e.g. mongod)

  * go to your NSF source directory

  * make sure, the c-driver libraries are on the library path
    (assuming the c-driver was installed in /usr/local/lib)

````
    export DYLD_LIBRARY_PATH=/usr/local/lib:`pwd`
````

  * run

````
    ./nxsh library/mongodb/tests/nsf-mongo.test
````

    The script is using the low level interface (nsf::mongo) and has a
    few insert, query and delete statements, some of these are
    commented out.

 * run

````
    ./nxsh library/mongodb/example-nx-mongo.tcl
````

    This example script is using the higher-level object-oriented
    interface for NX (nx::mongo).

    After running this script, you should could
    check the content in MongoDB:

````
    % mongo
    MongoDB shell version: v3.4.0
    connecting to: test
    > use tutorial
    switched to db tutorial
    >  db.persons.find();
   { "_id" : ObjectId("530c6e4649686ad16e261f81"), "name" : "Gustaf", "projects" : "nsf", "age" : 53 }
   { "_id" : ObjectId("530c6e4649686ad16e261f82"), "name" : "Stefan", "projects" : "nsf" }
   { "_id" : ObjectId("530c6e4649686ad16e261f83"), "name" : "Victor", "a" : [  "x",  "y" ], "age" : 31 }
   { "_id" : ObjectId("530c6e4649686ad16e261f84"), "name" : "Joe", "projects" : "abc", "age" : 23, "classes" : [  DBRef("courses", ObjectId("100000000000000000000000")) ] }
   { "_id" : ObjectId("530c6e4649686ad16e261f85"), "name" : "Franz", "info" : { "x" : 203, "y" : 102 }, "age" : 29, "projects" : "gtat" }
   { "_id" : ObjectId("530c6e4649686ad16e261f86"), "name" : "Selim", "ts" : Timestamp(1302945037, 1), "d" : ISODate("2011-04-16T09:53:39.279Z") }
   >
````

## Further sample-scripts: ##

````
    ./nxsh library/mongodb/tests/nx-bi.test
    ./nxsh library/mongodb/tests/nx-reference-one.test
    ./nxsh library/mongodb/tests/nx-reference-many.test
    ./nxsh library/mongodb/tests/nx-rep.test
    ./nxsh library/mongodb/tests/nx-serialize.test
    ./nxsh library/mongodb/tests/nsf-gridfs.test
````