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Sample IVR app that uses database actions

This article tries to explain how to use the built-in database action in Voicent IVR Studio through a simple sample app. The following figure shows the call flow.

For an incoming call, the app first checks a database table and find all entries. If the total number of entries is greater than 0, then it reads back each entry one-by-one. If there is no entry, it informs the caller.

Setup Database

In this sample, we use mysql database engine. First we create a database named test, then we create a table named test. It does not matter what how you define the table as long as you have a column called name. A sample table could look like the following:

id name phone
100 Mike 4081112222
101 Mary 4081113333

Setup JDBC Driver

Select the root element “Incoming Call”, right click on properties…, then click the Setup JDBC… button.

Make sure you choose the correct JDBC connection string and other info for your application.

Setup Variables

From the same root element’s property window, select the Variable tab. Add the following 4 variables as follows:

Name initial Value Comment
rc jsoninit() The variable to hold the database query result
entry jsoninit() The variable to hold one row of the query
total 0 The total number of entries returned
index 0 Loop variable to go through the query result

The result of a database query is saved in a JSON array. In this case, variable rc is used to hold the value. To initialize a JSON variable, use jsoninit().

The Database Action

In this sample, we use a simple select all statement from the test table.

The result is then saved in the variable rc by using a setvar action, rc = getentry, where getentry is the name of the database action.

Check Total Rows Returned

We use the built-in function jsonsize to check the total rows returned. To make it easier to later actions, we assign the result to a variable total, where total = jsonsize(rc).

Get One Specific Row

To get a specific row, use the array format. For this example, we use the setvar action to set entry = rc[index]. You can then access the name column by notation.

The Sample IVR App

The sample app can be download here: IVR Database Action Sample.

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