标签：lis word 4.0 SQ cto mode apache junit web
首先，来个项目全景预览，文章尾部附上Demo下载链接
【1】pom.xml配置（加入jar包）
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zyq</groupId> <artifactId>test</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>test Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <!-- https://mvnrepository.com/artifact/junit/junit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.5</version> </dependency> <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>6.0.6</version> </dependency> </dependencies> <build> <finalName>test</finalName> </build> </project>
【2】创建对象实体User.java
package com.zyq.entity; public class User { private int id; private String name; private String phone; public int getId() { return id; } public String getName() { return name; } public String getPhone() { return phone; } public void setId(int id) { this.id = id; } public void setName(String name) { this.name = name; } public void setPhone(String phone) { this.phone = phone; } @Override public String toString() { return "User [id=" + id + ", name=" + name + ", phone=" + phone + "]"; } }
【3】创建Dao层接口
package com.zyq.dao; import java.util.List; import com.zyq.entity.User; public interface UserDao { /** * 获取所有用户 */ List<User> getUserList(); /** * 获取单个用户 */ User getUserById(int id); /** * 添加用户 */ void addUser(User user); /** * 更新用户 */ void updateUser(User user); /** * 删除单个用户 */ void deleteUserById(int id); }
【4】mapper.xml配置（每个语句id与Dao层接口名称需要保持一致，parameterType="user" 中的user是取的别名，详见【5】）
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zyq.dao.UserDao"> <!-- 查询用户 --> <select id="getUserList" resultType="user"> SELECT * FROM user </select> <!-- 查询所有用户 --> <select id="getUserById" parameterType="int" resultType="user"> SELECT * FROM user WHERE id = #{id} </select> <!-- 新增用户 --> <insert id="addUser" parameterType="user"> INSERT INTO user (id, name, phone) VALUES (#{id}, #{name}, #{phone}) </insert> <!-- 修改用户 --> <update id="updateUser" parameterType="user"> UPDATE user SET name=#{name}, phone=#{phone} WHERE id=#{id} </update> <!-- 删除用户 --> <delete id="deleteUserById" parameterType="int"> DELETE FROM user WHERE id=#{id} </delete> </mapper>
【5】mybatis-config.xml配置（主要用于加载数据源信息，特别说明：数据源中的url本来是用&链接，但在xml文件中，需要用转义为&）
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 别名 --> <typeAliases> <typeAlias type="com.zyq.entity.User" alias="user"/> </typeAliases> <!-- 数据源 --> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"></transactionManager> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC"/> <property name="username" value="root"/> <property name="password" value="zyq123"/> </dataSource> </environment> </environments> <!-- 加载mapper文件 --> <mappers> <mapper resource="mapper.xml"/> </mappers> </configuration>
【6】MySessionFactory（创建session，与数据库发生交互）
package com.zyq.until; import java.io.InputStream; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; public class MySessionFactory { private static String mybatisResource = "mybatis-config.xml"; private static SqlSessionFactory sqlSessionFactory; public static SqlSessionFactory getSqlSessionFactory() throws Exception{ if (sqlSessionFactory == null) { InputStream inputStream = Resources.getResourceAsStream(mybatisResource); sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); } return sqlSessionFactory; } public static SqlSession getSession(){ try { return getSqlSessionFactory().openSession(); } catch (Exception e) { e.printStackTrace(); } return null; } }
【7】创建表
顺便表中首先插入几条数据用于测试
【8】MybatisTest（测试类。特别说明：这里事务由于回滚，并不会将修改后的数据保存在数据库中）
package test; import java.util.List; import org.apache.ibatis.session.SqlSession; import org.junit.Before; import org.junit.Test; import com.zyq.dao.UserDao; import com.zyq.entity.User; import com.zyq.until.MySessionFactory; public class MybatisTest { private SqlSession session; private UserDao userDao; @Before public void initSession() { session = MySessionFactory.getSession(); userDao = session.getMapper(UserDao.class); } /** * 单元测试 ：根据ID查询用户 */ @Test public void getUserByIdTest(){ int id = 1; User user = userDao.getUserById(id); if (user != null) { System.out.println(user.toString()); } else { System.out.println("不存在id=" + id + "的用户！"); } } /** * 单元测试 ：获取所有用户 */ @Test public void getUserListTest(){ List<User> users = userDao.getUserList(); if (users != null && !users.isEmpty()) { for (User user : users) { System.out.println(user.toString()); } } else { System.out.println("当前数据库无用户！"); } } /** * 单元测试 ：添加用户 */ @Test public void addUserTest(){ User user = new User(); user.setId(101); user.setName("诸葛亮"); user.setPhone("13256565656"); userDao.addUser(user); // 检测新增是否成功 User check = userDao.getUserById(user.getId()); session.commit(); // 这一句释放开会提交记录到数据库，注释则不会，下同 if (check != null) { System.out.println("添加成功！"); } else { System.out.println("添加失败！"); } } /** * 单元测试：根据ID修改用户信息 */ @Test public void updateUserTest(){ int id = 1; User user = userDao.getUserById(id); if (user != null) { // 这里调用了String.format()方法，不明白的请自行百度 System.out.println(String.format("存在id=%s的用户：%s", id, user.toString())); // 修改内容为在原数据后面加一个"_upd" user.setName(user.getName() + "_upd"); user.setPhone(user.getPhone() + "_upd"); userDao.updateUser(user); session.commit(); // 修改后查询对比 User check = userDao.getUserById(id); System.out.println("修改后的用户：" + check.toString()); } else { System.out.println(String.format("不存在id=%s的用户！", id)); } } /** * 单元测试：根据ID删除用户 */ @Test public void deleteUserByIdTest(){ int id = 1; User user = userDao.getUserById(id); if (user != null) { System.out.println("已存在的用户：" + user.toString()); userDao.deleteUserById(id); session.commit(); // 检测删除是否成功 User check = userDao.getUserById(id); if (check == null) { System.out.println("删除成功！"); } else { System.out.println("删除失败！"); } } else { System.out.println("不存在id=" + id + "的用户！"); } } }
以上就是一个简单的Mybatis配置及使用过程，
下面附上项目源码下载地址：提取码【5m26】
https://pan.baidu.com/s/1YPWeqUZStArXTzy3cKj9gA
在下载项目导入后你需要注意2点，即可到测试类进行测试：
（1）到数据库中建立一个user表，并插入几条数据，详见【7】
（2）修改数据源，如果是本地的话，则只需要修改用户名（username）和密码（password），详见【5】
标签：lis word 4.0 SQ cto mode apache junit web
原文地址：https://www.cnblogs.com/zhangyuanqiang/p/9107434.html
