用于DAO和Web服务的数据库插入方法的Junit测试用例

我正在实施一个基于Web服务的大学管理系统。 该系统将某些课程添加到数据库中。 下面是我正在使用的代码。

Course.java

public class Course { private String courseName; private String location; private String courseId; public String getCourseId() { return courseId; } public void setCourseId(String courseId) { this.courseId = courseId; } public String getCourseName() { return courseName; } public void setCourseName(String courseName) { this.courseName = courseName; } public String getLocation() { return location; } public void setLocation(String location) { this.location = location; } } 

那么另一个文件如下

CourseDaoImpl.java

 public class CourseDaoImpl implements IDao { Connection conn = null; Statement stmt = null; public CourseDaoImpl(){ try { Class.forName("com.mysql.jdbc.Driver").newInstance(); conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/univesitydb", "root", "root"); stmt = conn.createStatement(); if (!conn.isClosed()) System.out.println("Successfully connectiod"); } catch (SQLException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } @Override public String add(Object object) { Course c = (Course) object ; String courseId = c.getCourseId(); String courseName = c.getCourseName(); String location = c.getLocation(); String result = ""; int rowcount; try { String query = "Insert into course (courseId,courseName,location) values" + " ('" + courseId + "', '" + courseName + "', '" + location + "')"; rowcount = stmt.executeUpdate(query); if (rowcount > 0) { result = "true"; System.out.println("Course inserted successful"); } else { result = "false:The data could not be inserted in the databse"; } } catch (SQLException e) { e.printStackTrace(); } return result; } 

第三个是如下的Web服务文件，它与前两个交互并将数据添加到数据库。

CourseService.java

 package edu.service; import edu.dao.IDao; import edu.dao.impl.CourseDaoImpl; import edu.db.entity.Course; public class CourseService { public String addCourse(String courseId, String courseName, String location) { Course c = new Course(); c.setCourseId(courseId); c.setCourseName(courseName); c.setLocation(location); IDao dao = new CourseDaoImpl(); return dao.add(c); } 

看看我的代码清单，任何机构都可以建议我如何为我的add方法编写测试用例。 我是JAVA的初学者，我从朋友那里学习了这个java部分，现在需要为我的数据库方法实现Junit测试，比如上面的添加课程。

请建议一些我可以学习，阅读和使用的东西来实现我的数据库方法的Junit测试。

Answer 1

这是在spring项目中使用junit的一个示例dao测试。

 import java.util.List; import junit.framework.Assert; import org.jboss.tools.example.springmvc.domain.Member; import org.jboss.tools.example.springmvc.repo.MemberDao; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import org.springframework.test.context.transaction.TransactionConfiguration; import org.springframework.transaction.annotation.Transactional; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:test-context.xml", "classpath:/META-INF/spring/applicationContext.xml"}) @Transactional @TransactionConfiguration(defaultRollback=true) public class MemberDaoTest { @Autowired private MemberDao memberDao; @Test public void testFindById() { Member member = memberDao.findById(0l); Assert.assertEquals("John Smith", member.getName()); Assert.assertEquals("[e-mail]", member.getEmail()); Assert.assertEquals("2125551212", member.getPhoneNumber()); return; } @Test public void testFindByEmail() { Member member = memberDao.findByEmail("[e-mail]"); Assert.assertEquals("John Smith", member.getName()); Assert.assertEquals("[e-mail]", member.getEmail()); Assert.assertEquals("2125551212", member.getPhoneNumber()); return; } @Test public void testRegister() { Member member = new Member(); member.setEmail("[e-mail]"); member.setName("Jane Doe"); member.setPhoneNumber("2125552121"); memberDao.register(member); Long id = member.getId(); Assert.assertNotNull(id); Assert.assertEquals(2, memberDao.findAllOrderedByName().size()); Member newMember = memberDao.findById(id); Assert.assertEquals("Jane Doe", newMember.getName()); Assert.assertEquals("[e-mail]", newMember.getEmail()); Assert.assertEquals("2125552121", newMember.getPhoneNumber()); return; } @Test public void testFindAllOrderedByName() { Member member = new Member(); member.setEmail("[e-mail]"); member.setName("Jane Doe"); member.setPhoneNumber("2125552121"); memberDao.register(member); List members = memberDao.findAllOrderedByName(); Assert.assertEquals(2, members.size()); Member newMember = members.get(0); Assert.assertEquals("Jane Doe", newMember.getName()); Assert.assertEquals("[e-mail]", newMember.getEmail()); Assert.assertEquals("2125552121", newMember.getPhoneNumber()); return; } } 

Answer 2

您的类的设计将使它们难以测试。 使用硬编码连接字符串或在方法中使用new实例化协作者可以被视为测试反模式。 看看DependencyInjection模式。 像Spring这样的框架在这​​里可能会有所帮助。

要对DAO进行测试，您需要在unit testing中控制数据库连接。 因此，您要做的第一件事就是将它从DAO中提取到一个类中，您可以模拟或指向特定的测试数据库，您可以在测试运行之前和之后设置和检查它。

测试db / DAO代码的技术解决方案可能是dbunit 。 您可以在无模式XML中定义测试数据，并让dbunit在测试数据库中填充它。 但你仍然需要自己连接所有东西。 然而，使用Spring，你可以使用类似spring-test-dbunit的东西，它可以为你提供大量的杠杆和额外的工具。

当你称自己为初学者时，我怀疑这一切都非常令人生畏。 您应该问自己是否真的需要测试数据库代码。 如果不是，您至少应该重构代码，这样您就可以轻松模拟所有数据库访问。 对于一般的嘲笑，看看Mockito 。

Answer 3

 @Test public void testSearchManagementStaff() throws SQLException { boolean res=true; ManagementDaoImp mdi=new ManagementDaoImp(); boolean b=mdi.searchManagementStaff("[e-mail]"," 123456"); assertEquals(res,b); } 

Answer 4

/ *

公共类UserDAO {

 public boolean insertUser(UserBean u) { boolean flag = false; MySqlConnection msq = new MySqlConnection(); try { String sql = "insert into regis values(?,?,?,?,?)"; Connection connection = msq.getConnection(); PreparedStatement statement = null; statement = (PreparedStatement) connection.prepareStatement(sql); statement.setString(1, u.getname()); statement.setString(2, u.getlname()); statement.setString(3, u.getemail()); statement.setString(4, u.getusername()); statement.setString(5, u.getpasswords()); statement.executeUpdate(); flag = true; } catch (Exception e) { } finally { return flag; } } public String userValidate(UserBean u) { String login = ""; MySqlConnection msq = new MySqlConnection(); try { String email = u.getemail(); String Pass = u.getpasswords(); String sql = "SELECT name FROM regis WHERE email=? and passwords=?"; com.mysql.jdbc.Connection connection = msq.getConnection(); com.mysql.jdbc.PreparedStatement statement = null; ResultSet rs = null; statement = (com.mysql.jdbc.PreparedStatement) connection.prepareStatement(sql); statement.setString(1, email); statement.setString(2, Pass); rs = statement.executeQuery(); if (rs.next()) { login = rs.getString("name"); } else { login = "false"; } } catch (Exception e) { } finally { return login; } } public boolean getmessage(UserBean u) { boolean flag = false; MySqlConnection msq = new MySqlConnection(); try { String sql = "insert into feedback values(?,?)"; Connection connection = msq.getConnection(); PreparedStatement statement = null; statement = (PreparedStatement) connection.prepareStatement(sql); statement.setString(1, u.getemail()); statement.setString(2, u.getfeedback()); statement.executeUpdate(); flag = true; } catch (Exception e) { } finally { return flag; } } public boolean insertOrder(cartbean u) { boolean flag = false; MySqlConnection msq = new MySqlConnection(); try { String sql = "insert into cart (product_id, email, Tprice, quantity) values (?,?,2000,?)"; Connection connection = msq.getConnection(); PreparedStatement statement = null; statement = (PreparedStatement) connection.prepareStatement(sql); statement.setString(1, u.getpid()); statement.setString(2, u.getemail()); statement.setString(3, u.getquantity()); statement.executeUpdate(); flag = true; } catch (Exception e) { System.out.print("hi"); } finally { return flag; } } 

}