Batch Requesting

The batch requests feature allows you to send multiple (IN-Only) requests to a datasource using a single operation (batch operation).

Prerequisites

Let's create a MySQL database with the required data.

  1. Install the MySQL server.

  2. Create the following database: Company

    CREATE DATABASE Company;

  3. Create the Employees table:

    USE Company;


CREATE TABLE `Employees` (`EmployeeNumber` int(11) NOT NULL, `FirstName` varchar(255) NOT NULL, `LastName` varchar(255) DEFAULT NULL, `Email` varchar(255) DEFAULT NULL, `JobTitle` varchar(255) DEFAULT NULL, `OfficeCode` int(11) NOT NULL, PRIMARY KEY (`EmployeeNumber`,`OfficeCode`));

Synapse configuration

Given below is the data service configuration you need to build. See the instructions on how to build and run this example.

Tip

Be sure to replace the datasource username and password with the correct values for your MySQL instance.

<data name="batch_requesting_sample" transports="http https local">
   <config enableOData="false" id="Datasource">
      <property name="driverClassName">com.mysql.jdbc.Driver</property>
      <property name="url">jdbc:mysql://localhost:3306/Company</property>
      <property name="username">root</property>
      <property name="password">password</property>
   </config>
   <query id="addEmployeeQuery" useConfig="Datasource">
      <sql>insert into Employees (EmployeeNumber, FirstName, LastName, Email, JobTitle, OfficeCode) values(:EmployeeNumber,:FirstName,:LastName,:Email,:JobTitle,:Officecode)</sql>
      <param name="EmployeeNumber" sqlType="STRING"/>
      <param name="FirstName" sqlType="STRING"/>
      <param name="LastName" sqlType="STRING"/>
      <param name="Email" sqlType="STRING"/>
      <param name="JobTitle" sqlType="STRING"/>
      <param name="Officecode" sqlType="STRING"/>
   </query>
   <operation name="addEmployeeOp">
      <call-query href="addEmployeeQuery">
         <with-param name="EmployeeNumber" query-param="EmployeeNumber"/>
         <with-param name="FirstName" query-param="FirstName"/>
         <with-param name="LastName" query-param="LastName"/>
         <with-param name="Email" query-param="Email"/>
         <with-param name="JobTitle" query-param="JobTitle"/>
         <with-param name="Officecode" query-param="Officecode"/>
      </call-query>
   </operation>
</data>

Build and run

Create the artifacts:

  1. Set up WSO2 Integration Studio. The path to this folder is referred to as MI_TOOLING_HOME throughout this tutorial.

  2. Download the JDBC driver for MySQL from here and copy it to the MI_TOOLING_HOME/Contents/Eclipse/runtime/microesb/lib/ (for MacOS) or MI_TOOLING_HOME/runtime/microesb/lib/ (for Windows) directory.

    Note

    If the driver class does not exist in the relevant folders when you create the datasource, you will get an exception such as Cannot load JDBC driver class com.mysql.jdbc.Driver.

  3. Create a Data Service project

  4. Create the data service with the configurations given above.
  5. Deploy the artifacts in your Micro Integrator.

Let's send a request with multiple transactions to the data service:

  1. Download and Install SoapUI to run this SOAP service.

  2. Create a new SOAP project in SoapUI by using the following wsdl file: 

    http://localhost:8290/services/batch_requesting_sample?wsdl

  3. Update the addEmployeeOp operation (under batch_requesting_sampleSOAP11Binding) with the request body as shown below:

!!! Tip In this example, we are sending two transactions with details of two employees.

```xml
<p:addEmployeeOp_batch_req xmlns:p="http://ws.wso2.org/dataservice">
      <!--1 or more occurrences-->
      <addEmployeeOp xmlns="http://ws.wso2.org/dataservice">
         <!--Exactly 1 occurrence-->
         <xs:EmployeeNumber xmlns:xs="http://ws.wso2.org/dataservice">1002</xs:EmployeeNumber>
         <!--Exactly 1 occurrence-->
         <xs:FirstName xmlns:xs="http://ws.wso2.org/dataservice">John</xs:FirstName>
         <!--Exactly 1 occurrence-->
         <xs:LastName xmlns:xs="http://ws.wso2.org/dataservice">Doe</xs:LastName>
         <!--Exactly 1 occurrence-->
         <xs:Email xmlns:xs="http://ws.wso2.org/dataservice">[email protected]</xs:Email>
         <!--Exactly 1 occurrence-->
         <xs:JobTitle xmlns:xs="http://ws.wso2.org/dataservice">Consultant</xs:JobTitle>
         <!--Exactly 1 occurrence-->
         <xs:Officecode xmlns:xs="http://ws.wso2.org/dataservice">01</xs:Officecode>
      </addEmployeeOp>
      <addEmployeeOp xmlns="http://ws.wso2.org/dataservice">
         <!--Exactly 1 occurrence-->
         <xs:EmployeeNumber xmlns:xs="http://ws.wso2.org/dataservice">1004</xs:EmployeeNumber>
         <!--Exactly 1 occurrence-->
         <xs:FirstName xmlns:xs="http://ws.wso2.org/dataservice">Peter</xs:FirstName>
         <!--Exactly 1 occurrence-->
         <xs:LastName xmlns:xs="http://ws.wso2.org/dataservice">Parker</xs:LastName>
         <!--Exactly 1 occurrence-->
         <xs:Email xmlns:xs="http://ws.wso2.org/dataservice">[email protected]</xs:Email>
         <!--Exactly 1 occurrence-->
         <xs:JobTitle xmlns:xs="http://ws.wso2.org/dataservice">Consultant</xs:JobTitle>
         <!--Exactly 1 occurrence-->
         <xs:Officecode xmlns:xs="http://ws.wso2.org/dataservice">01</xs:Officecode>
      </addEmployeeOp>
   </p:addEmployeeOp_batch_req>
```
  1. Invoke the addEmployeeOp operation.

You will find that all the records have been inserted into the Employees database simultaneously.

Tip

Want to confirm that the records are added to the database? Run the following MySQL command.

SELECT * FROM Employees
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