问题：
TestNg测试端项目结构：
几个主要文件的内容：
1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE mapper
3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
5 <mapper namespace="com.course">
6 <!-- 获取登录接口case -->
7 <select id="loginCase" parameterType="Integer" resultType="com.course.model.LoginCase">
8 SELECT * FROM loginCase
9 WHERE id = #{id};
10 </select>
11 <!--添加用户接口case-->
12 <select id="addUserCase" parameterType="Integer" resultType="com.course.model.AddUserCase">
13 select * from addUserCase where id=#{id};
14 </select>
15 <!-- 获取用户信息case -->
16 <select id="getUserInfoCase" parameterType="Integer" resultType="com.course.model.GetUserInfoCase">
17 SELECT * FROM getUserInfoCase
18 WHERE id = #{id};
19 </select>
20 <!-- 获取用户列表case -->
21 <select id="getUserListCase" parameterType="Integer" resultType="com.course.model.GetUserListCase">
22 <!-- SQL语句 -->
23 select * from getUserListCase where id=#{id};
24 </select>
25 <!-- 更新/删除用户信息case -->
26 <select id="updateUserInfoCase" parameterType="Integer" resultType="com.course.model.UpdateUserInfoCase">
27 select * from updateUserInfoCase where id = #{id};
28 </select>
29
30 <!--添加用户接口-->
31 <select id="addUser" parameterType="com.course.model.AddUserCase" resultType="com.course.model.User">
32 select * from user
33 where userName=#{userName}
34 and password=#{password}
35 and sex=#{sex}
36 and age=#{age}
37 and permission=#{permission}
38 and isDelete=#{isDelete};
39 </select>
40 <!-- 获取用户信息 -->
41 <select id="getUserInfo" parameterType="com.course.model.GetUserInfoCase" resultType="com.course.model.User">
42 select * from user WHERE
43 id=#{userId};
44 </select>
45
46 <!--获取用户列表-->
47 <select id="getUserList" parameterType="com.course.model.GetUserListCase" resultType="com.course.model.User">
48 <!-- SQL语句 -->
49 select * from user
50 <trim prefix="WHERE" prefixOverrides="and">
51 <if test="null != userName and '' !=userName">
52 AND userName=#{userName}
53 </if>
54 <if test="null != sex and '' !=sex">
55 AND sex=#{sex}
56 </if>
57 <if test="null != age and '' !=age">
58 AND age=#{age}
59 </if>
60 </trim>
61 ;
62 </select>
63 <!--获取更新后的数据-->
64 <select id="getUpdateUserInfo" parameterType="com.course.model.UpdateUserInfoCase" resultType="com.course.model.User">
65 select * from user
66 <trim prefix="WHERE" prefixOverrides="and">
67 <if test="null != userName and '' !=userName">
68 AND userName=#{userName}
69 </if>
70 <if test="null != sex and '' !=sex">
71 AND sex=#{sex}
72 </if>
73 <if test="null != age and '' !=age">
74 AND age=#{age}
75 </if>
76 <if test="null != permission and '' !=permission">
77 AND permission=#{permission}
78 </if>
79 <if test="null != isDelete and '' !=isDelete">
80 AND isDelete=#{isDelete}
81 </if>
82 </trim>
83 And id = #{userId};
84 </select>
85
86 <insert id="insertUser" parameterType="com.course.model.User">
87 INSERT INTO USER(userName, password, sex, age, permission, isDelete)
88 VALUES(#{userName}, #{password}, #{sex}, #{age}, #{permission}, #{isDelete})
89 </insert>
90 </mapper>
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 4 <!-- 注意configuration中的标签有一定的顺序 5 properties, settings, typeAliases, typeHandlers, objectFactory, objectWrapperFactory, 6 reflectorFactory, plugins, environments, databaseIdProvider, mappers 7 --> 8 <configuration> 9 <!-- 设置log记录sql语句 --> 10 <settings> 11 <setting name="logImpl" value="STDOUT_LOGGING"/> 12 </settings> 13 <!-- 注册对象的空间命名 --> 14 <environments default="development"> 15 <environment id="development"> 16 <transactionManager type="JDBC" /> 17 <dataSource type="POOLED"> 18 <!-- 1.加载数据库驱动 --> 19 <property name="driver" value="com.mysql.jdbc.Driver" /> 20 <!-- 2.数据库连接地址 --> 21 <property name="url" value="jdbc:mysql://localhost:3306/course12?characterEncoding=utf8&useSSL=false" /> 22 <!-- 3.数据库用户 --> 23 <property name="username" value="root" /> 24 <!-- 4.数据库密码 --> 25 <property name="password" value="yxh1990" /> 26 </dataSource> 27 </environment> 28 </environments> 29 <!-- 注册映射文件：java对象与数据库之间的xml文件路径 --> 30 <mappers> 31 <mapper resource="mapper/SQLMapper.xml" /> 32 </mappers> 33 34 </configuration>
1 package com.course.utils;
2
3 import org.apache.ibatis.io.Resources;
4 import org.apache.ibatis.session.SqlSession;
5 import org.apache.ibatis.session.SqlSessionFactory;
6 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
7
8 import java.io.IOException;
9 import java.io.Reader;
10
11 public class DatabaseUtil {
12
13 public static SqlSession getSqlSession() throws IOException {
14 // 获取配置的资源文件
15 Reader reader = Resources.getResourceAsReader("databaseConfig.xml");
16
17 SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
18 // sqlSession就是能够执行配置文件中的sql语句
19 SqlSession sqlSession = factory.openSession();
20 return sqlSession;
21 }
22 }
GetUserInfoTest中运行过程描述：
1.通过DataBaseUtil获取一个SqlSession session=DatabaseUtil.getSqlSession()，
2.session通过映射文件获取getuserinfocase表第一行内容并封装到GetUserInfoCase实体中
3.使用HttpClient发送请求访问getUserInfo接口（参数为GetUserInfoCase），返回查询的结果
4.session通过映射文件和参数查询获取user表中的user信息
GetUserInfoTest.java
1 package com.course.cases;
2
3 import com.course.config.TestConfig;
4 import com.course.model.GetUserInfoCase;
5 import com.course.model.User;
6 import com.course.utils.DatabaseUtil;
7 import org.apache.http.HttpResponse;
8 import org.apache.http.client.methods.HttpPost;
9 import org.apache.http.entity.StringEntity;
10 import org.apache.http.util.EntityUtils;
11 import org.apache.ibatis.session.SqlSession;
12 import org.json.JSONArray;
13 import org.json.JSONObject;
14 import org.testng.Assert;
15 import org.testng.annotations.Test;
16
17 import java.io.IOException;
18 import java.util.ArrayList;
19 import java.util.Arrays;
20 import java.util.List;
21
22 public class GetUserInfoTest {
23
24 @Test(dependsOnGroups = "loginTrue", description = "获取userId为1的用户信息")
25 public void getUserInfo() throws IOException, InterruptedException {
26 SqlSession session = DatabaseUtil.getSqlSession();
27 GetUserInfoCase getUserInfoCase = session.selectOne("getUserInfoCase", 1);
28 System.out.println(getUserInfoCase.toString());
29 System.out.println(TestConfig.getUserInfoUrl);
30
31 //下边为写完接口的代码
32 JSONArray resultJson = getJsonResult(getUserInfoCase);
33
34 User user = session.selectOne(getUserInfoCase.getExpected(), getUserInfoCase);
35 System.out.println("自己查询数据库获取用户信息："+user.toString());
36
37 List userList = new ArrayList();
38 userList.add(user);
39 JSONArray jsonArray = new JSONArray(userList);
40 System.out.println("获取用户信息："+jsonArray.toString());
41 System.out.println("调用接口获取用户信息："+resultJson.toString());
42 Assert.assertEquals(jsonArray.toString(), resultJson.toString());
43 }
44
45 private JSONArray getJsonResult(GetUserInfoCase getUserInfoCase) throws IOException {
46 HttpPost post = new HttpPost(TestConfig.getUserInfoUrl);
47 JSONObject param = new JSONObject();
48 param.put("id", getUserInfoCase.getUserId());
49 // 设置请求头信息 设置header
50 post.setHeader("content-type", "application/json");
51 //将参数信息添加到方法中
52 StringEntity entity = new StringEntity(param.toString(), "utf-8");
53 post.setEntity(entity);
54 //设置cookies
55 TestConfig.defaultHttpClient.setCookieStore(TestConfig.store);
56 //声明一个对象来进行响应结果的存储
57 String result;
58 //执行post方法
59 HttpResponse response = TestConfig.defaultHttpClient.execute(post);
60 //获取响应结果
61 result = EntityUtils.toString(response.getEntity(), "utf-8");
62 System.out.println("调用接口result："+result);
63 JSONArray jsonArray = new JSONArray(result);
64 System.out.println(jsonArray.toString());
65 return jsonArray;
66 }
67 }
AddUserTest中运行过程描述：
1.通过DataBaseUtil获取一个SqlSession session=DatabaseUtil.getSqlSession()，
2.session通过映射文件获取adduserinfocase表第一行内容并封装到AddUserInfoCase实体中
3.使用HttpClient发送请求访问getUserInfo接口（参数为AddUserInfoCase），接口将信息插入user表
4.session通过映射文件和参数查询获取user表中的user信息（？此处无法查询到user，user为null）
AddUserTest.java
1 package com.course.cases;
2
3 import com.course.config.TestConfig;
4 import com.course.model.AddUserCase;
5 import com.course.model.User;
6 import com.course.utils.DatabaseUtil;
7 import org.apache.http.HttpResponse;
8 import org.apache.http.client.methods.HttpPost;
9 import org.apache.http.entity.StringEntity;
10 import org.apache.http.util.EntityUtils;
11 import org.apache.ibatis.session.SqlSession;
12 import org.json.JSONObject;
13 import org.testng.Assert;
14 import org.testng.annotations.Test;
15
16 import java.io.IOException;
17 import java.util.Random;
18
19 public class AddUserTest {
20
21 @Test(dependsOnGroups = "loginTrue", description = "添加用户接口")
22 public void addUser() throws IOException, InterruptedException {
23 SqlSession session = DatabaseUtil.getSqlSession();
24 AddUserCase addUserCase = session.selectOne("addUserCase", 1);
25 // 将查询到的addUserCase中的userName更新，防止每次都要删除user表中的记录
26 addUserCase.setUserName(addUserCase.getUserName()+ new Random().nextInt());
27 System.out.println(addUserCase.toString());
28 System.out.println(TestConfig.addUserUrl);
29
30 // 发送请求，获取结果
31 String result = getResult(addUserCase);
32 System.out.println("异步结果"+result);
33 //验证返回结果
34 /* 此处需要新建一个SqlSession才能查询新增的user，不然无法查询结果 */
35 //SqlSession session1 = DatabaseUtil.getSqlSession();
36 User user = session.selectOne("addUser", addUserCase);
37 System.out.println(user.toString());
38
39 Assert.assertEquals(addUserCase.getExpected(), result);
40 }
41
42 private String getResult(AddUserCase addUserCase) throws IOException {
43 HttpPost post = new HttpPost(TestConfig.addUserUrl);
44 JSONObject param = new JSONObject();
45 param.put("userName", addUserCase.getUserName());
46 param.put("password", addUserCase.getPassword());
47 param.put("sex", addUserCase.getSex());
48 param.put("age", addUserCase.getAge());
49 param.put("permission", addUserCase.getPermission());
50 param.put("isDelete", addUserCase.getIsDelete());
51
52 // 设置头信息
53 post.setHeader("content-type", "application/json");
54 StringEntity entity = new StringEntity(param.toString(), "utf-8");
55 post.setEntity(entity);
56
57 // 设置cookies
58 TestConfig.defaultHttpClient.setCookieStore(TestConfig.store);
59 String result; //存放返回结果
60 HttpResponse response = TestConfig.defaultHttpClient.execute(post);
61
62 result = EntityUtils.toString(response.getEntity(), "utf-8");
63
64 System.out.println(result);
65
66 return result;
67 }
68 }
如何解决上面user为null的情况？目前发现两种解决方法：
1.重新建一个SqlSession查询数据库就好了，SqlSession session1 = DatabaseUtil.getSqlSession();
2.修改SqlSession sqlSession = factory.openSession();为SqlSession sqlSession = factory.openSession(true);
1 package com.course.utils;
2
3 import org.apache.ibatis.io.Resources;
4 import org.apache.ibatis.session.SqlSession;
5 import org.apache.ibatis.session.SqlSessionFactory;
6 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
7
8 import java.io.IOException;
9 import java.io.Reader;
10
11 public class DatabaseUtil {
12
13 public static SqlSession getSqlSession() throws IOException {
14 // 获取配置的资源文件
15 Reader reader = Resources.getResourceAsReader("databaseConfig.xml");
16
17 SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
18 // sqlSession就是能够执行配置文件中的sql语句
19 SqlSession sqlSession = factory.openSession();
20 return sqlSession;
21 }
22 }
但是目前不理解，同样的为啥GetUserTest.java中没有出现该问题，在AddUserTest.java中出现问题
来源：https://www.cnblogs.com/smartsmile-yxh/p/12201621.html