Work with SQL Databases

11min
You can use flows to make a connection with SQL databases. 
Step 1: Install MySQL in Litmus Edge
To install MySQL in Litmus Edge:
Navigate to Applications > Marketplace.
Click Marketplace List and select Default Marketplace Catalog. 
Click the MySQL tile.
The MySQL configuration dialog box opens. 
Installation script version: From the drop-down list, select latest. 
Name: Enter a name for the application.
Leave the other fields with their default values. 
Click Launch. 
Navigate to Applications > Catalog Apps to ensure the application is running successfully.
Running MySQL application
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If you have any issues installing MySQL, do the following:
Check System > Info to make sure that you have enough space on your edge device.
Make sure that you do not have any network connectivity issues.
Navigate to Applications > Catalog Apps and click the MySQL application tile to view the logs. Review any errors. 
If you get the MySQL error message Error: Too many connections , refer to MySQL Error Message: Too Many Connections﻿. 
Step 2: Create Flow
To create the flow:
In Litmus Edge, navigate to the Flows Manager and create a new flow. See Create a Flow﻿ to learn more. 
On the Flow canvas, drag and connect an Inject node, a Template node, a MySQL node, and a Debug node.
Flows canvas with MySQL nodes connection
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Configure MySQL Node
You need to configure a database connection for the MySQL node. 
To configure the MySQL node: 
Double-click the MySQL node.
The Edit mysql node dialog box opens.
In the Database field, click the Edit icon. 
Configure the properties for the node. 
Host: Enter the IP address for your SQL server. It is 127.0.0.1 if your MySQL instance is running on the same device as Litmus Edge.
Port: If needed, update the default port value 3306. 
User: Enter the user value from the MySQL application configuration. The default value is user.
Password: Enter the password value from the MySQL application configuration. The default value is loopedge-s3cr3t!.
Database: Enter the database value from the MySQL application configuration. The default value is sample.
If needed, configure the remaining parameters.  
Click Add, and then Done.
Edit mysql node dialog box
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Configure Template Node
To configure the Template node:
Double-click the Template node.
The Edit template node dialog box opens. 
Property:  Select msg. and enter topic. 
Template: Enter below query into the form.
CREATE TABLE Example (
    id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255)
);
Edit template node dialog box
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Click Done, and then Deploy. 
Review Flow Payload
To review the flow payload:
Expand the message window beneath the flow and click the Debug icon.
Flows canvas debug section
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Click the Inject Node button to run queries after writing them.
The output result for mysql query
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Example Queries
Review the following example queries. 
Create a Table
MySQL
CREATE TABLE Example (

id int NOT NULL AUTO_INCREMENT PRIMARY KEY,

name VARCHAR(255)

);
CREATE TABLE Example (

id int NOT NULL AUTO_INCREMENT PRIMARY KEY,

name VARCHAR(255)

);
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Insert Values
MySQL
INSERT INTO Example (name)

VALUES ("Jane"),("John"),("Chris");
INSERT INTO Example (name)

VALUES ("Jane"),("John"),("Chris");
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Read the Inserted Values
MySQL
SELECT * FROM Example;
SELECT * FROM Example;
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Update Inserted Values
MySQL
UPDATE Example
SET name = "Christine"
WHERE name = "Chris";
UPDATE Example
SET name = "Christine"
WHERE name = "Chris";
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Delete Values
MySQL
DELETE FROM Example WHERE name = "Christine";
DELETE FROM Example WHERE name = "Christine";
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Updated 23 Sep 2024
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