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Validating Input Data in a Data Request

Validators are added to individual input mappings in a query. Input validation allows data services to validate the input parameters in a request and stop the execution of the request if the input doesn’t meet the required criteria. WSO2 Micro Integrator provides a set of built-in validators for some of the most common use cases. It also provides an extension mechanism to write custom validators.

Prerequisites

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

  1. Install the MySQL server.
  2. Create a database named EmployeeDatabse .

    CREATE DATABASE EmployeeDatabase;
  3. Create the Employee table inside the Employees database:

    USE EmployeeDatabase;
    
    CREATE TABLE Employees (EmployeeNumber int(11) NOT NULL, FirstName varchar(255) NOT NULL, LastName varchar(255) DEFAULT NULL, Email varchar(255) DEFAULT NULL, Salary varchar(255));

Synapse configuration

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

<data name="input_validator_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/EmployeeDatabase</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, Salary) values(:EmployeeNumber,:FirstName,:LastName,:Email,:Salary)</sql>
      <param name="EmployeeNumber" sqlType="STRING"/>
      <param name="FirstName" sqlType="STRING">
            <validateLength maximum="10" minimum="3"/>
      </param>
      <param name="LastName" sqlType="STRING"/>
      <param name="Email" sqlType="STRING"/>
      <param name="Salary" 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="Salary" query-param="Salary"/>
      </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_HOME/lib directory.

    Note

    If you are running this sample using the embedded Micro Integrator of WSO2 Integration Studio, the lib directory is located in MI_TOOLING_HOME/Contents/Eclipse/runtime/microesb/ (for Linux/MacOS/CentOS) or MI_TOOLING_HOME/runtime/microesb/lib/ (for Windows).

    If the driver class does not exist in the relevant directory 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 invalid and valid data 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/input_validator_sample?wsdl

  3. Update the addEmployeeOp operation (under input_validator_sample.SOAP12Binding) with the request body as shown below:

        <dat:addEmployeeOp>
            <dat:EmployeeNumber>6001</dat:EmployeeNumber>
            <dat:FirstName>AB</dat:FirstName>
            <dat:LastName>Nick</dat:LastName>
            <dat:Email>test@test.com</dat:Email>
            <dat:Salary>1500</dat:Salary>
        </dat:addEmployeeOp>
  4. Invoke the addEmployeeOp operation.

    A validation error is thrown as the response because the addEmployeeOp operation has failed. This is because the FirstName value only has 2 characters.

  5. Now, change the FirstName value in the request as shown below and invoke the operation again.

        <dat:addEmployeeOp>
            <dat:EmployeeNumber>6001</dat:EmployeeNumber>
            <dat:FirstName>ABC</dat:FirstName>
            <dat:LastName>Nick</dat:LastName>
            <dat:Email>test@test.com</dat:Email>
            <dat:Salary>1500</dat:Salary>
        </dat:addEmployeeOp>
    The employee details are added to the database table.

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