BAEL-970 A Guide to Apache Commons DbUtils (#2125)

* BAEL-970 A Guide to Apache Commons DbUtils * BAEL-970 A Guide to Apache Commons DbUtils * BAEL-970 A Guide to Apache Commons DbUtils - Added employeeId to Email class - Minor corrections
2017-07-10 20:04:02 -05:00
parent 1b9353c83e
commit 9c643cd652
6 changed files with 361 additions and 1 deletions
@@ -0,0 +1,38 @@
+package com.baeldung.commons.dbutils;
+
+public class Email {
+    private Integer id;
+    private Integer employeeId;
+    private String address;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getEmployeeId() {
+        return employeeId;
+    }
+
+    public void setEmployeeId(Integer employeeId) {
+        this.employeeId = employeeId;
+    }
+    
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    @Override
+    public String toString() {
+        return "Email{" + "id=" + id + ", address=" + address + '}';
+    }
+
+}
@@ -0,0 +1,67 @@
+package com.baeldung.commons.dbutils;
+
+import java.util.Date;
+import java.util.List;
+
+public class Employee {
+    private Integer id;
+    private String firstName;
+    private String lastName;
+    private Double salary;
+    private Date hiredDate;
+    private List<Email> emails;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public Double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(Double salary) {
+        this.salary = salary;
+    }
+
+    public Date getHiredDate() {
+        return hiredDate;
+    }
+
+    public void setHiredDate(Date hiredDate) {
+        this.hiredDate = hiredDate;
+    }
+
+    public List<Email> getEmails() {
+        return emails;
+    }
+
+    public void setEmails(List<Email> emails) {
+        this.emails = emails;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee{" + "id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", salary=" + salary + ", hiredDate=" + hiredDate + '}';
+    }
+
+}
@@ -0,0 +1,45 @@
+package com.baeldung.commons.dbutils;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.apache.commons.dbutils.BasicRowProcessor;
+import org.apache.commons.dbutils.BeanProcessor;
+
+import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.handlers.BeanListHandler;
+
+public class EmployeeHandler extends BeanListHandler<Employee> {
+
+    private Connection connection;
+
+    public EmployeeHandler(Connection con) {
+        super(Employee.class, new BasicRowProcessor(new BeanProcessor(getColumnsToFieldsMap())));
+        this.connection = con;
+    }
+
+    @Override
+    public List<Employee> handle(ResultSet rs) throws SQLException {
+        List<Employee> employees = super.handle(rs);
+
+        QueryRunner runner = new QueryRunner();
+        BeanListHandler<Email> handler = new BeanListHandler<>(Email.class);
+        String query = "SELECT * FROM email WHERE employeeid = ?";
+        for (Employee employee : employees) {
+            List<Email> emails = runner.query(connection, query, handler, employee.getId());
+            employee.setEmails(emails);
+        }
+        return employees;
+    }
+
+    public static Map<String, String> getColumnsToFieldsMap() {
+        Map<String, String> columnsToFieldsMap = new HashMap<>();
+        columnsToFieldsMap.put("FIRST_NAME", "firstName");
+        columnsToFieldsMap.put("LAST_NAME", "lastName");
+        columnsToFieldsMap.put("HIRED_DATE", "hiredDate");
+        return columnsToFieldsMap;
+    }
+}