Writing this Article For Reference and this might help others .

I, am New to JBPM , if Anything Mentioned In the article is Wrong Please Suggest it in the comments .

Reference video:
In Order Use Execute-Sql-Work-Item-Handler:
Please Follow this Video Guide From YouTube:
jBPM ExecuteSqlWorkItemHandler | KIE TUTORIALS
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Installing
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`Please make sure that you have toggled the Execute-Sql in the Custom Tasks Administration section.
Steps to Follow :

1. Click on the gear icon in the nav bar, scroll down and open Custom Tasks Administration .
2. Search for Execute-Sql and toggle it to the yes state. If prompted for jndi name just add : java:jboss/datasources/ Adding Dependencies In order to add external Data source, Navigate to your:
3. Project> Settings >Deployments> Work Item handlers >
4. Add a new Work Item Handler

`

• Name: ExecuteSQL

• Value:
  new org.jbpm.process.workitem.executesql.ExecuteSqlWorkItemHandler("java:jboss/datasources/")

• Resolver type: MVEL
  `

• Navigate to Dependencies and add a dependency From [Here][2] .
   Or else 

• GroupID : org.jbpm.contrib | Artifact ID : execute-sql-workitem | Version : 7.42.0.Final

• Save the Configuration and the Create the Business Process as required.`
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  Drivers Deployment
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• Download the Zip from below link

• [mysqljdbcdriver.zip][3]

• Extract the zip and copy the mysql-connector-java-5.1.47-bin.jar file.

  Navigate JBPM Installation Folder \standalone\deployments
  paste the file there.

• Navigate to JBPM Installation Folder \modules\com

  • Create folder named: Mysql
  • Inside mysql folder create a folder named main. The main Folder Directory would look like: JBPM Installation Folder \modules\com\mysql\main

• Navigate to JBPM Installation Folder \bin\drivers

  • Copy mysql-connector-java.jar file.
  • Repeat the Steps 2 and 3
  • Navigate to JBPM Installation Folder \modules\com\mysql\main Paste the file.
  • Create a .xml file named module.xml.
  • The Contents of the module.xml file is: <?xml version='1.0' encoding='UTF-8'?> Adding The External Data Source  - - - - - - - - - - - - - - - -

• Now open Another Terminal in the bin and Execute the Following Command " jboss-cli.bat -c "

• Configure Your DataSource From the Below Command :

  xa-data-source add - name=

  • jndi-name="java:/jboss/datasources/" - user-name=jbpm - password=jbpm - driver-name=mysql-connector-java.jar - xa-datasource-class=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource - xa-datasource-properties=[{ServerName=localhost,PortNumber=3306,DatabaseName=}] *replace & with the with database name.and the other parameters with their respective values .

• Now You can Use the External DataSource .
  
  Reference Links
  
  For PostgreSql : https://karinavarela.me/2020/06/17/persisting-custom-data-configuring-external-persistence/
  
  MySql : http://www.mastertheboss.com/bpm/jbpm6/configuring-jbpm-to-use-mysql-as-database/

 [2]: https://mvnrepository.com/artifact/org.jbpm.contrib/execute-sql-workitem/7.42.0.Final
 [3]: https://dbschema.com/jdbc-drivers/MySqlJdbcDriver.zip