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# Validate database values

In this use case, a test executes an action that modifies a database. The goal of this use case is to validate that the resulting values in the database are correct.

The following table shows a typical flow for a Web Services of the script. You can use a similar validation for other protocols.

Step | API function
--- | ---
Connect to database | lr_db_connect (in vuser_init section)
Web Service call | web_service_call
Execute an SQL query | lr_db_executeSQLStatement
Retrieve and save the data | lr_db_getvalue to <param_name>
Check the data | lr_checkpoint
Disconnect from database | lr_db_disconnect (in vuser_end section)

For more information, see the Function Reference.

The following example illustrates this process of checking the data:

    Action()
    {
    /* A Web Service call that modifies a database on the back end. */
        web_service_call( "StepName=addAddr_102",
            "SOAPMethod=Axis2AddrBookService|Axis2AddrBookPort|addAddr",
            "ResponseParam=response",
            "Service=Axis2AddrBookService",
            "ExpectedResponse=SoapResult",
            "Snapshot=t1227169681.inf",
            BEGIN_ARGUMENTS,
            "xml:arg0="
                "<arg0>"
                    "<name>{Customers}</name>"
                    "<city>{City}</city>"
                "</arg0>",
            END_ARGUMENTS,
            LAST);
    /* Query the database by the customer name that was modified by the Web Service*/
        lr_db_executeSQLStatement("StepName=MyStep",
            "ConnectionName=MyConnection",
            "SQLQuery=SELECT * FROM Addresses WHERE name = '{Customers}' ",
            "DatasetName=ds1",
            LAST);
    /* Get the values retrieved by the database query. */
        lr_db_getvalue("StepName=MyStep",
            "DatasetName=ds1",
            "Column=Name",
            "Row=current",
            "OutParam=CustomerName",
            LAST);
    /* Compare the actual value with the expected value stored in the database. */
        lr_checkpoint("StepName=validateCustomer",
            "ActualValue={Customers}",
            "ExpectedValue={CustomerName}",
            "Compare=Equals",
            "StopOnValidationError=false",
            LAST);
    return 0;
    }

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