Getting Startedwith pureQuery

Chapter 11 – Annotated-Method Programming Style 225
Listing 11.15 - An annotated method that creates an EmployeeBean object for the
employee with the specified employee number
11.5.1.2 Modify the displayLogin() method to use the new annotated method
In hrm.inProgress.pdqMethodStyle.HumanResourcesManager, modify the
displayLogin method to use the new annotated method to query the database and
create the EmployeeBean object. This is shown in Listing 11.16.
// Search the database for an employee with the employee number that the
// user entered.
employeeUsedForLogin = data.selectEmployee (employeeNumber);
Listing 11.16 - Modify the displayLogin() method to use the annotated method
11.5.2 In practice: Specify a pureQuery bean as a parameter to an SQL
statement-- Complete the “Employee Information” screen
The "Employee Information" screen displays detailed information for a single employee.
The displayEmployeeInformation method has an EmployeeBean parameter that
provides details about the employee. The screen also displays summary information about
the manager of the employee. Information about an employee’s manager is not included in
an EmployeeBean object. Add an annotated method that gets the information about an
employee’s manager.
11.5.2.1 Add an annotated method to HumanResourcesData that executes the SQL
We next need an SQL statement to determine the manager of an employee... Listing
10.12 shows the SQL query that we will use to select the information about the employee
who manages the specified employee. This SQL statement is described in Section 6.4.2.1.
Next, we need to declare an annotated method in
hrm.inProgress.pdqMethodStyle.HumanResourcesData that will execute this
query. Since we are executing a SELECT statement, we use the
com.ibm.pdq.annotation.Select annotation. We want the method to return the
manager’s information in an EmployeeBean object, and there will be at most one row, so
we choose to have EmployeeBean as the return type of the method.
We will use pureQuery parameter markers for the parameters to the SQL. We need the
employee number and the department number for the employee. Both of these pieces of
information are available in the EmployeeBean object that is a parameter to the method.
Refer to Table 11.1, which lists the various types of parameter markers. Both the ?n.name
type of parameter marker and the :name type expect that the information is a property in a
pureQuery bean. We choose to use the ?n.name type. The names of the appropriate
properties in EmployeeBean are employeeNumber and departmentNumber.
Therefore, the two parameter markers are ?1.employeeNumber and