JBoss Data Virtualization on OpenShift: Integrating a Remote SQL Server Database

This example shows how on OpenShift to use a custom database driver to connect to an external database, through a Virtual Database (aka VDB). For this example, we will use a Microsoft SQL Server database (believe it or not, running on a Linux container), and the latest SQL Server JDBC driver.

Prerequisites

Before you begin, make sure you have the firewall and other security tools in a permissive mode.

Here is the list of tools needed to follow the example:

Internet connection
Git client
OpenJDK 1.8
Docker
OpenShift oc command-line client

You can download and unpack the OpenShift oc cli tool from the Red Hat Customer Portal for use on Linux, MacOSX, and Windows clients if you have an active OpenShift Enterprise subscription to access the downloads page.

Editor's Note: Red Hat Container Development Kit includes a single-node OpenShift cluster you can run on your local machine. It is available by joining Red Hat Developers and downloading Red Hat Development Suite.

Git clone the project

To get the files needed for this example, clone my github repository:

$ git clone https://github.com/foogaro/jdv-playground.git

Then navigate to the ocp folder, as it will be our working directory.

Setting up the SQL Server database

Docker should be up and running, if it's not, start it as follows:

$ service docker start
Redirecting to /bin/systemctl start  docker.service

Run SQL Server on a container as follows:

$ docker run --name="sqlserver-loves-linux" -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=datavirt.2017' -p 1433:1433 -d microsoft/mssql-server-linux:latest
Unable to find image 'microsoft/mssql-server-linux:latest' locally
Trying to pull repository registry.access.redhat.com/microsoft/mssql-server-linux ...
Trying to pull repository docker.io/microsoft/mssql-server-linux ...
latest: Pulling from docker.io/microsoft/mssql-server-linux
f6fa9a861b90: Downloading [======================>                            ] 20.91 MB/46.41 MB
da7318603015: Downloading [==================================================>]    851 B/851 B
6a8bd10c9278: Download complete
d5a40291440f: Download complete
bbdd8a83c0f1: Download complete
3a52205d40a6: Downloading [========================>                          ] 14.45 MB/28.98 MB
6192691706e8: Downloading [=====================>                             ] 16.51 MB/38.7 MB
1a658a9035fb: Waiting
97fa7291bda1: Waiting
b27ed30c4cf6: Waiting

Once done, you should have you database up and running, as follows:

$ docker ps -aq
CONTAINER ID        IMAGE                                                                                                                               COMMAND                  CREATED             STATUS                         PORTS                    NAMES
d0bc27cdbf85        microsoft/mssql-server-linux:latest                                                                                                 "/bin/sh -c /opt/mssq"   2 hours ago         Up 2 hours                     0.0.0.0:1433->1433/tcp   sqlserver-loves-linux

Once you have the database up and running, you can login to it and create the database, the schema, and the table, as follows:

Create the database

/opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P datavirt.2017 -Q "CREATE DATABASE DATAVIRT2;"

Create the table

/opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P datavirt.2017 -Q "USE DATAVIRT2;
CREATE TABLE dbo.ITEMS ( 
  ITEM_ID INT NOT NULL, 
  ITEM_CODE VARCHAR(20) NOT NULL,  
  ITEM_DESCRITION VARCHAR(255) ,
  DT_INSERT DATETIME NOT NULL,
  DT_UPDATE DATETIME NOT NULL,
  CONSTRAINT PK_ITEM_ID PRIMARY KEY (ITEM_ID)
);"

Populate the table

/opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P datavirt.2017 -Q "USE DATAVIRT2;
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (1, '0000-0000-0000-0001', 'One', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (2, '0000-0000-0000-0002', 'Two', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (3, '0000-0000-0000-0003', 'Three', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (4, '0000-0000-0000-0004', 'Four', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (5, '0000-0000-0000-0005', 'Five', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (6, '0000-0000-0000-0006', 'Six', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (7, '0000-0000-0000-0007', 'Seven', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (8, '0000-0000-0000-0008', 'Eight', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (9, '0000-0000-0000-0009', 'Nine', GETDATE(), GETDATE());
INSERT INTO dbo.ITEMS (ITEM_ID, ITEM_CODE, ITEM_DESCRITION, DT_INSERT, DT_UPDATE) VALUES (10, '0000-0000-0000-0010', 'Ten', GETDATE(), GETDATE());"

Running OCP

The OC client tool will use Docker to create all the nodes it needs, such as the docker registry, the HAProxy node, and so on.
It's a good practice to have the OpenShift configuration persisted, so we don't need to eventually re-import tables, images and so on.
Here is the script that we will use to launch OCP:

oc cluster up \
--host-data-dir="/opt/rh/oc-cluster-up/data"  \
--host-pv-dir="/opt/rh/oc-cluster-up/pv"  \
--host-volumes-dir="/opt/rh/oc-cluster-up/vol" \
--logging=false \
--metrics=true \
--public-hostname="ocp.foogaro.com" \
--routing-suffix="apps.foogaro.com" \
--use-existing-config ocp-datavirt

Feel free to change the hostname and the routing suffix to whatever you want. Also, make sure to add the hostname in your /etc/hosts file.
If everything started properly, you should have an output similar to the following:

Starting OpenShift using registry.access.redhat.com/openshift3/ose:v3.6.173.0.5 ...
OpenShift server started.

The server is accessible via web console at:
    https://ocp.foogaro.com:8443

Login into OCP

We can now start using the OpenShift Container Platform.
First of all we need to login as system administrator and import the Docker images we need, as follows:

oc login -u system:admin https://127.0.0.1:8443
Logged into "https://127.0.0.1:8443" as "system:admin" using existing credentials.

You have access to the following projects and can switch between them with 'oc project <projectname>':

  * default
    kube-public
    kube-system
    myproject
    openshift
    openshift-infra

Using project "default".

To access the platform as system administrator you don't need credentials, as it uses a certificate which was created during the installation.
Once we are in, we can start importing the templates as follows:

oc create -n openshift -f https://raw.githubusercontent.com/jboss-openshift/application-templates/master/jboss-image-streams.json
oc create -n openshift -f https://raw.githubusercontent.com/jboss-openshift/application-templates/master/datavirt/datavirt63-basic-s2i.json
oc create -n openshift -f https://raw.githubusercontent.com/jboss-openshift/application-templates/master/datavirt/datavirt63-extensions-support-s2i.json
oc create -n openshift -f https://raw.githubusercontent.com/jboss-openshift/application-templates/master/datavirt/datavirt63-secure-s2i.json

Now that we have the templates loaded into the platform, we can use them to create our project.
First login as admin as follows:

oc login -u admin -p admin
Login successful.

You don't have any projects. You can try to create a new project, by running

    oc new-project <projectname>

Now create a project:

oc new-project jdv-playground --description="JDV Playground on OCP" --display-name="JDV Playground"

Now create the app, as follows:

oc new-app --template=datavirt63-extensions-support-s2i \
-p APPLICATION_NAME=datavirt-app \
-p CONFIGURATION_NAME=datavirt-app-config \
-p SOURCE_REPOSITORY_URL=https://github.com/foogaro/jdv-playground \
-p SOURCE_REPOSITORY_REF=master \
-p CONTEXT_DIR=ocp/vdbs \
-p EXTENSIONS_REPOSITORY_URL=https://github.com/foogaro/jdv-playground \
-p EXTENSIONS_REPOSITORY_REF=master \
-p EXTENSIONS_DIR=ocp/drivers \
-p EXTENSIONS_DOCKERFILE=Dockerfile \
-p SERVICE_ACCOUNT_NAME=datavirt-service-account \
-p HTTPS_SECRET=datavirt-app-secret \
-p HTTPS_KEYSTORE=keystore.jks \
-p HTTPS_KEYSTORE_TYPE=JKS \
-p HTTPS_NAME=datavirt \
-p HTTPS_PASSWORD=datavirt.2017 \
-p TEIID_USERNAME=teiidUser \
-p TEIID_PASSWORD=datavirt.2017 \
-p MODESHAPE_USERNAME=modeshapeUser \
-p MODESHAPE_PASSWORD=datavirt.2017 \
-p IMAGE_STREAM_NAMESPACE=jdv-playground \
-p JGROUPS_ENCRYPT_SECRET=datavirt-app-secret \
-p JGROUPS_ENCRYPT_KEYSTORE=jgroups.jceks \
-p JGROUPS_ENCRYPT_NAME=datavirt \
-p JGROUPS_ENCRYPT_PASSWORD=datavirt.2017 \
-p JGROUPS_CLUSTER_PASSWORD=datavirt.2017 \
-p VDB_DIRS=

This will automatically create the app and start building the image based on the code and resource files.
While it is building the first images, we need to create a couple of secrets and link them to our application, as follows:

oc create serviceaccount datavirt-service-account
oc policy add-role-to-user view system:serviceaccount:jdv-play:datavirt-service-account -n jdv-playground
oc secrets new datavirt-app-secret keystore.jks jgroups.jceks -n jdv-playground
oc secrets new datavirt-app-config datasources.env -n jdv-playground
oc secrets link datavirt-service-account datavirt-app-secret datavirt-app-config -n jdv-playground

Next, create the following environment variables for the build config and the deployment config, as follows:

oc env bc/datavirt-app VDB_DIRS=
oc env dc/datavirt-app SQLSERVER_DS_DATABASE=DATAVIRT
oc env dc/datavirt-app SQLSERVER_DS_JNDI=java:/SQLSERVER_DS
oc env dc/datavirt-app SQLSERVER_DS_USERNAME=sa
oc env dc/datavirt-app SQLSERVER_DS_PASSWORD=datavirt.2017
oc env dc/datavirt-app SQLSERVER_DS_URL="jdbc:sqlserver://192.168.59.105:1433;DatabaseName=DATAVIRT;"
oc env dc/datavirt-app SQLSERVER_DS_SERVICE_HOST=192.168.59.105
oc env dc/datavirt-app SQLSERVER_DS_SERVICE_PORT=1433

If you need to restart the build, do as follows:

oc start-build datavirt-app-ext

If you need to delete the serviceaccount, and the secrets, do as follows:

oc delete secrets datavirt-app-secret
oc delete secrets datavirt-app-config
oc delete serviceaccount datavirt-service-account

If you need to provide your own certificates, here is how I created mine:

keytool -genkeypair -alias datavirt -storetype JKS   -keystore keystore.jks  -storepass "datavirt.2017" -keypass "datavirt.2017" --dname "CN=lfugaro,OU=Consulting,O=redhat.com,L=Raleigh,S=NC,C=US"
keytool -genseckey  -alias datavirt -storetype JCEKS -keystore jgroups.jceks -storepass "datavirt.2017" -keypass "datavirt.2017" --dname "CN=lfugaro,OU=Consulting,O=redhat.com,L=Raleigh,S=NC,C=US"

The web console

If everything worked fine, you should be able to connect to the web console on port 8443, login as admin (password "admin" as well), and see something similar to the following image:

Getting the data out of the VDB

JDV out-of-the-box exposes its data through the OData protocol version 2 and 4. The schema of the database can be obtained with the following URL:

http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/$metadata

Where odata4 specifies the protocol version to use; the first ITEMS refers to the VDB name, and the second ITEMS refers to the schema.
Here is how the output should look like:

<?xml version='1.0' encoding='UTF-8'?>
<edmx:Edmx Version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">
    <edmx:Reference Uri="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/static/org.apache.olingo.v1.xml">
        <edmx:Include Namespace="org.apache.olingo.v1" Alias="olingo-extensions"/>
    </edmx:Reference>
    <edmx:DataServices>
        <Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="ITEMS.1.ITEMS" Alias="ITEMS">
            <EntityType Name="ITEMS">
                <Key>
                    <PropertyRef Name="ITEM_ID"/>
                </Key>
                <Property Name="ITEM_ID" Type="Edm.Int32" Nullable="false"/>
                <Property Name="ITEM_CODE" Type="Edm.String" Nullable="false" MaxLength="20"/>
                <Property Name="ITEM_DESCRITION" Type="Edm.String" MaxLength="255"/>
                <Property Name="DT_INSERT" Type="Edm.DateTimeOffset" Nullable="false" Precision="4"/>
                <Property Name="DT_UPDATE" Type="Edm.DateTimeOffset" Nullable="false" Precision="4"/>
            </EntityType>
            <EntityContainer Name="ITEMS">
                <EntitySet Name="ITEMS" EntityType="ITEMS.ITEMS"/>
            </EntityContainer>
        </Schema>
    </edmx:DataServices>
</edmx:Edmx>

The XML code above shows the structure of the datatabse, along with the tables, which are the entities it has.
We have one table named ITEMS. To access the table, point to the following URL:

http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS

Here is how the output should look:

<?xml version='1.0' encoding='UTF-8'?>
<a:feed xmlns:a="http://www.w3.org/2005/Atom" xmlns:m="http://docs.oasis-open.org/odata/ns/metadata"
        xmlns:d="http://docs.oasis-open.org/odata/ns/data" m:context="$metadata#ITEMS">
    <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS</a:id>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(1)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(1)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">1</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0001</d:ITEM_CODE>
                <d:ITEM_DESCRITION>One</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.797Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.797Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(2)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(2)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">2</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0002</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Two</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.797Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.797Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(3)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(3)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">3</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0003</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Three</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.8Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.8Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(4)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(4)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">4</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0004</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Four</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.807Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.807Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(5)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(5)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">5</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0005</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Five</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.807Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.807Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(6)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(6)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">6</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0006</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Six</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.81Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.81Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(7)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(7)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">7</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0007</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Seven</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.81Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.81Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(8)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(8)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">8</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0008</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Eight</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.817Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.817Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(9)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(9)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">9</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0009</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Nine</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.817Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.817Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
    <a:entry>
        <a:id>http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(10)</a:id>
        <a:title/>
        <a:summary/>
        <a:updated>2017-12-10T00:24:38Z</a:updated>
        <a:author>
            <a:name/>
        </a:author>
        <a:link rel="edit" href="http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS(10)"/>
        <a:category scheme="http://docs.oasis-open.org/odata/ns/scheme" term="#ITEMS.1.ITEMS.ITEMS"/>
        <a:content type="application/xml">
            <m:properties>
                <d:ITEM_ID m:type="Int32">10</d:ITEM_ID>
                <d:ITEM_CODE>0000-0000-0000-0010</d:ITEM_CODE>
                <d:ITEM_DESCRITION>Ten</d:ITEM_DESCRITION>
                <d:DT_INSERT m:type="DateTimeOffset">2017-12-09T19:52:50.82Z</d:DT_INSERT>
                <d:DT_UPDATE m:type="DateTimeOffset">2017-12-09T19:52:50.82Z</d:DT_UPDATE>
            </m:properties>
        </a:content>
    </a:entry>
</a:feed>

You can eventually have the result in a different format, for example in JSON, by specifing the $format, as follows:

http://datavirt-app-jdv-playground.apps.foogaro.com/odata4/ITEMS/ITEMS/ITEMS?$format=json

Here is how the output should look like:

{
  "@odata.context": "$metadata#ITEMS",
  "value": [
    {
      "ITEM_ID": 1,
      "ITEM_CODE": "0000-0000-0000-0001",
      "ITEM_DESCRITION": "One",
      "DT_INSERT": "2017-12-09T19:52:50.797Z",
      "DT_UPDATE": "2017-12-09T19:52:50.797Z"
    },
    {
      "ITEM_ID": 2,
      "ITEM_CODE": "0000-0000-0000-0002",
      "ITEM_DESCRITION": "Two",
      "DT_INSERT": "2017-12-09T19:52:50.797Z",
      "DT_UPDATE": "2017-12-09T19:52:50.797Z"
    },
    {
      "ITEM_ID": 3,
      "ITEM_CODE": "0000-0000-0000-0003",
      "ITEM_DESCRITION": "Three",
      "DT_INSERT": "2017-12-09T19:52:50.8Z",
      "DT_UPDATE": "2017-12-09T19:52:50.8Z"
    },
    {
      "ITEM_ID": 4,
      "ITEM_CODE": "0000-0000-0000-0004",
      "ITEM_DESCRITION": "Four",
      "DT_INSERT": "2017-12-09T19:52:50.807Z",
      "DT_UPDATE": "2017-12-09T19:52:50.807Z"
    },
    {
      "ITEM_ID": 5,
      "ITEM_CODE": "0000-0000-0000-0005",
      "ITEM_DESCRITION": "Five",
      "DT_INSERT": "2017-12-09T19:52:50.807Z",
      "DT_UPDATE": "2017-12-09T19:52:50.807Z"
    },
    {
      "ITEM_ID": 6,
      "ITEM_CODE": "0000-0000-0000-0006",
      "ITEM_DESCRITION": "Six",
      "DT_INSERT": "2017-12-09T19:52:50.81Z",
      "DT_UPDATE": "2017-12-09T19:52:50.81Z"
    },
    {
      "ITEM_ID": 7,
      "ITEM_CODE": "0000-0000-0000-0007",
      "ITEM_DESCRITION": "Seven",
      "DT_INSERT": "2017-12-09T19:52:50.81Z",
      "DT_UPDATE": "2017-12-09T19:52:50.81Z"
    },
    {
      "ITEM_ID": 8,
      "ITEM_CODE": "0000-0000-0000-0008",
      "ITEM_DESCRITION": "Eight",
      "DT_INSERT": "2017-12-09T19:52:50.817Z",
      "DT_UPDATE": "2017-12-09T19:52:50.817Z"
    },
    {
      "ITEM_ID": 9,
      "ITEM_CODE": "0000-0000-0000-0009",
      "ITEM_DESCRITION": "Nine",
      "DT_INSERT": "2017-12-09T19:52:50.817Z",
      "DT_UPDATE": "2017-12-09T19:52:50.817Z"
    },
    {
      "ITEM_ID": 10,
      "ITEM_CODE": "0000-0000-0000-0010",
      "ITEM_DESCRITION": "Ten",
      "DT_INSERT": "2017-12-09T19:52:50.82Z",
      "DT_UPDATE": "2017-12-09T19:52:50.82Z"
    }
  ]
}

That's it, I hope it helped!

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