Write a Simple Go Application to work with Cvent Data on Linux

Use CData ODBC drivers and unixODBC to create a simple Go app with live connectivity to Cvent data.

Go is an open source programming language that enables you to easily build software on Linux/UNIX machines. When Go is paired with the ODBC Driver for Cvent and unixODBC you are able write applications with connectivity to live Cvent data. This article will walk you through the process of installing the ODBC Driver for Cvent, configuring a connection using the unixODBC Driver Manager, and creating a simple Go application to work with Cvent data.

Using the CData ODBC Drivers on a Unix/Linux Machine

The CData ODBC Drivers are supported in various Red Hat-based and Debian-based systems, including Ubuntu, Debian, RHEL, CentOS, and Fedora. There are also several libraries and packages that are required, many of which may be installed by default, depending on your system. For more information on the supported versions of Linux operating systems and the required libraries, please refer to the "Getting Started" section in help documentation (installed and found online).

Installing the Driver Manager

Before installing the driver, you need to be sure that your system has a driver manager. For this article, you will use unixODBC, a free and open source ODBC driver manager that is widely supported.

For Debian-based systems like Ubuntu, you can install unixODBC with the APT package manager:


apt-get install unixodbc unixodbc-dev

For systems based on Red Hat Linux, you can install unixODBC with yum or dnf:


yum install unixODBC unixODBC-devel

The unixODBC driver manager reads information about drivers from an odbcinst.ini file and about data sources from an odbc.ini file. You can determine the location of the configuration files on your system by entering the following command into a terminal:


odbcinst -j

NOTE: You may need to install odbcinst. Use the following command in a terminal:


apt install odbcinst

The output of the command will display the locations of the configuration files for ODBC data sources and registered ODBC drivers. User data sources can only be accessed by the user account whose home folder the odbc.ini is located in. System data sources can be accessed by all users. Below is an example of the output of this command:


DRIVERS............: /etc/odbcinst.ini
SYSTEM DATA SOURCES: /etc/odbc.ini
FILE DATA SOURCES..: /etc/ODBCDataSources
USER DATA SOURCES..: /home/myuser/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8

Installing the Driver

You can download the driver in standard package formats: the Debian .deb package format or the .rpm file format. Once you have downloaded the file, you can install the driver from the terminal.

The driver installer registers the driver with unixODBC and creates a system DSN, which can be used later in any tools or applications that support ODBC connectivity.

For Debian-based systems like Ubuntu, run the following command with sudo or as root: dpkg -i /path/to/package.deb

For systems that support .rpms, run the following command with sudo or as root: rpm -i /path/to/package.rpm

Once the driver is installed, you can list the registered drivers and defined data sources using the unixODBC driver manager:

List the Registered Driver(s)


odbcinst -q -d
CData ODBC Driver for Cvent
...

List the Defined Data Source(s)


odbcinst -q -s
CData Cvent Source
...

To use the CData ODBC Driver for Cvent with unixODBC, you need to ensure that the driver is configured to use UTF-16. To do so, edit the INI file for the driver (cdata.odbc.cvent.ini), which can be found in the lib folder in the installation location (typically /opt/cdata/cdata-odbc-driver-for-cvent), as follows:

cdata.odbc.cvent.ini


...

[Driver]
DriverManagerEncoding = UTF-16

Modifying the DSN

When the driver is installed, a system DSN should be predefined. You can modify the DSN by editing the system data sources file (/etc/odbc.ini) and defining the required connection properties. Additionally, you can create user-specific DSNs that will not require root access to modify in $HOME/.odbc.ini.

Before you can authenticate to Cvent, you must create a workspace and an OAuth application.

Creating a Workspace

To create a workspace:

Sign into Cvent and navigate to App Switcher (the blue button in the upper right corner of the page) >> Admin.
In the Admin menu, navigate to Integrations >> REST API.
A new tab launches for Developer Management. Click on Manage API Access in the new tab.

Create a Workspace and name it. Select the scopes you would like your developers to have access to. Scopes control what data domains the developer can access.

Choose All to allow developers to choose any scope, and any future scopes added to the REST API.

Choose Custom to limit the scopes developers can choose for their OAuth apps to selected scopes. To access all tables exposed by the driver, you need to set the following scopes:

event/attendees:read	event/attendees:write	event/contacts:read
event/contacts:write	event/custom-fields:read	event/custom-fields:write
event/events:read	event/events:write	event/sessions:delete
event/sessions:read	event/sessions:write	event/speakers:delete
event/speakers:read	event/speakers:write	budget/budget-items:read
budget/budget-items:write	exhibitor/exhibitors:read	exhibitor/exhibitors:write
survey/surveys:read	survey/surveys:write

Creating an OAuth Application

After you have set up a Workspace and invited them, developers can sign up and create a custom OAuth app. See the Creating a Custom OAuth Application section in the Help documentation for more information.

Connecting to Cvent

After creating an OAuth application, set the following connection properties to connect to Cvent:

InitiateOAuth: GETANDREFRESH. Used to automatically get and refresh the OAuthAccessToken.
OAuthClientId: The Client ID associated with the OAuth application. You can find this on the Applications page in the Cvent Developer Portal.
OAuthClientSecret: The Client secret associated with the OAuth application. You can find this on the Applications page in the Cvent Developer Portal.

/etc/odbc.ini or $HOME/.odbc.ini


[CData Cvent Source]
Driver = /opt/cdata/cdata-odbc-driver-for-cvent/lib/libcventodbc.x64.so
Description = My Description
OAuthClientId = MyOAuthClientId
OAuthClientSecret = MyOAuthClientSecret

For specific information on using these configuration files, please refer to the help documentation (installed and found online).

Creating a Simple Go App for Cvent Data

With the Driver Manager installed and the DSN configured, you are ready to create a simple Go application to work with your Cvent data. To start, install a Go driver for ODBC databases. While there are several options available, this article will use the odbc driver found at https://github.com/alexbrainman/odbc.

Installing ODBC on Linux

There are a series of steps required to install the ODBC driver for Go.

Create the $HOME/golang/go path (if it does not exist) by entering the following commands in a terminal: mkdir /root/golang mkdir /root/golang/go
Define the GOPATH environment variable: export GOPATH=$HOME/golang/go
Create a module inside the new Go directory: cd $GOPATH go mod init myproject
Install the Go driver for ODBC databases:
go get http://github.com/alexbrainman/odbc

Now you are ready to create and execute a simple Go application.

Sample Go Application

The sample application issues a simple SQL SELECT query for Cvent data and displays the results. Create the directory $GOPATH/src/cdata-odbc-cvent and create a new Go source file, copying the source code from below.

cdata-odbc-cvent.go


package main

import (
  _ "github.com/alexbrainman/odbc"
  "database/sql"
  "log"
  "fmt"
)

func main() {
  db, err := sql.Open("odbc",
    "DSN=CData Cvent Source")
  if err != nil {
    log.Fatal(err)
  }

  var (
    id string
    title string
  )

  rows, err := db.Query("SELECT Id, Title FROM Events WHERE Virtual = ?", "true")
  if err != nil {
    log.Fatal(err)
  }
  defer rows.Close()
  for rows.Next() {
    err := rows.Scan(&id, &title)
    if err != nil {
      log.Fatal(err)
    }
    fmt.Println(id, title)
  }
  err = rows.Err()
  if err != nil {
    log.Fatal(err)
  }

  defer db.Close()
}

In the terminal, navigate to the Go application directory and build the application:


go build

After the application builds, you will be able to execute the application, displaying your Cvent data:


./cdata-odbc-cvent

At this point, you have a simple Go application for working with Cvent data. From here, you can easily expand the application, adding deeper read/write functionality through familiar SQL queries.

Ready to get started?

Download a free trial of the Cvent ODBC Driver to get started:

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Cvent ODBC Driver

The Cvent ODBC Driver is a powerful tool that allows you to connect with live data from Cvent, directly from any applications that support ODBC connectivity.

Access Cvent data like you would a database - read, write, and update Cvent 0, etc. through a standard ODBC Driver interface.

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