• SpringBoot使用Mybatis


    SpringBoot使用Mybatis

    Orm 框架的本质是简化编程中操作数据库的编码,发展到现在基本上就剩两家了,一个是宣称可以不用写一句

    Sql 的 Hibernate,一个是可以灵活调试动态 Sql 的 Mybatis ,两者各有特点,在企业级系统开发中可以根据需求灵

    活使用。发现一个有趣的现象:传统企业大都喜欢使用 Hibernate ,互联网行业通常使用 Mybatis 。

    Hibernate 特点就是所有的 Sql 都用 Java 代码来生成,不用跳出程序去写(看) Sql ,有着编程的完整性,发展

    到最顶端就是 Spring Data Jpa 这种模式了,基本上根据方法名就可以生成对应的 Sql 了。

    Mybatis 初期使用比较麻烦,需要各种配置文件、实体类、Dao 层映射关联、还有一大推其它配置。当然 Mybatis

    也发现了这种弊端,初期开发了generator https://github.com/mybatis/generator 可以根据表结果自动生

    产实体类、配置文件和 Dao 层代码,可以减轻一部分开发量;后期也进行了大量的优化可以使用注解了,自动管

    理 Dao 层和配置文件等,发展到最顶端就是今天要讲的这种模式了,mybatis-spring-boot-starter 就是

    Spring Boot+ Mybatis 可以完全注解不用配置文件,也可以简单配置轻松上手。

    现在想想 Spring Boot 就是牛逼呀,任何东西只要关联到 Spring Boot 都是化繁为简。

    1、mybatis-spring-boot-starter

    官方说明:MyBatis Spring-Boot-Starter will help you use MyBatis with Spring Boot

    其实就是 Mybatis 看 Spring Boot 这么火热也开发出一套解决方案来凑凑热闹,但这一凑确实解决了很多问题,

    使用起来确实顺畅了许多。mybatis-spring-boot-starter主要有两种解决方案,一种是使用注解解决一切问

    题,一种是简化后的老传统。

    当然任何模式都需要首先引入mybatis-spring-boot-starter的 Pom 文件:

    <dependency>
    	<groupId>org.mybatis.spring.bootgroupId>
    	<artifactId>mybatis-spring-boot-starterartifactId>
    	<version>2.0.0version>
    dependency>
    
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    好了下来分别介绍两种开发模式。

    2、无配置文件注解版

    就是一切使用注解搞定。

    2.1 pom依赖

    
    <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0modelVersion>
        <parent>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-parentartifactId>
            <version>2.1.0.RELEASEversion>
            <relativePath/>
        parent>
    
        <groupId>com.examplegroupId>
        <artifactId>spring-boot-mybatis-annotationartifactId>
        <version>0.0.1-SNAPSHOTversion>
        <name>spring-boot-mybatis-annotationname>
        <description>spring-boot-mybatis-annotationdescription>
    
        <properties>
            <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
            <java.version>1.8java.version>
        properties>
    
        <dependencies>
    
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-starter-webartifactId>
            dependency>
    
            <dependency>
                <groupId>org.mybatis.spring.bootgroupId>
                <artifactId>mybatis-spring-boot-starterartifactId>
                <version>2.0.0version>
            dependency>
    
            <dependency>
                <groupId>mysqlgroupId>
                <artifactId>mysql-connector-javaartifactId>
            dependency>
    
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-starter-testartifactId>
                <scope>testscope>
            dependency>
    
        dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.bootgroupId>
                    <artifactId>spring-boot-maven-pluginartifactId>
                plugin>
            plugins>
        build>
    
    project>
    
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    2.2 application.properties

    mybatis.type-aliases-package=com.example.model
    
    spring.datasource.url=jdbc:mysql://localhost:3306/test_user?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
    spring.datasource.username=root
    spring.datasource.password=root
    spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
    
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    Spring Boot 会自动加载 spring.datasource.* 相关配置,数据源就会自动注入到 sqlSessionFactory 中,

    sqlSessionFactory 会自动注入到 Mapper 中,对了,你一切都不用管了,直接拿起来使用就行了。

    在启动类中添加对 mapper 包扫描@MapperScan

    package com.example;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    @MapperScan("com.example.mapper")
    public class SpringBootMybatisAnnotationApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringBootMybatisAnnotationApplication.class, args);
        }
    
    }
    
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    或者直接在 Mapper 类上面添加注解@Mapper,建议使用上面那种,不然每个 mapper 加个注解也挺麻烦的。

    2.3 开发 Mapper

    第三步是最关键的一块, Sql 生产都在这里

    package com.example.mapper;
    
    import com.example.enums.UserSexEnum;
    import com.example.model.User;
    import org.apache.ibatis.annotations.*;
    import org.springframework.stereotype.Component;
    
    import java.util.List;
    
    @Component
    public interface UserMapper {
    
        @Select("SELECT * FROM users")
        @Results({
                @Result(property = "userSex", column = "user_sex", javaType = UserSexEnum.class),
                @Result(property = "nickName", column = "nick_name")
        })
        List<User> getAll();
    
        @Select("SELECT * FROM users WHERE id = #{id}")
        @Results({
                @Result(property = "userSex", column = "user_sex", javaType = UserSexEnum.class),
                @Result(property = "nickName", column = "nick_name")
        })
        User getOne(Long id);
    
        @Insert("INSERT INTO users(userName,passWord,user_sex) VALUES(#{userName}, #{passWord}, #{userSex})")
        void insert(User user);
    
        @Update("UPDATE users SET userName=#{userName},nick_name=#{nickName} WHERE id =#{id}")
        void update(User user);
    
        @Delete("DELETE FROM users WHERE id =#{id}")
        void delete(Long id);
    
    }
    
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    package com.example.enums;
    
    public enum UserSexEnum {
    	MAN, WOMAN
    }
    
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    package com.example.model;
    
    import com.example.enums.UserSexEnum;
    
    import java.io.Serializable;
    
    public class User implements Serializable {
    
    	private static final long serialVersionUID = 1L;
    	private Long id;
    	private String userName;
    	private String passWord;
    	private UserSexEnum userSex;
    	private String nickName;
    
    	public User() {
    		super();
    	}
    
    	public User(String userName, String passWord, UserSexEnum userSex) {
    		super();
    		this.passWord = passWord;
    		this.userName = userName;
    		this.userSex = userSex;
    	}
    
    	public Long getId() {
    		return id;
    	}
    
    	public void setId(Long id) {
    		this.id = id;
    	}
    
    	public String getUserName() {
    		return userName;
    	}
    
    	public void setUserName(String userName) {
    		this.userName = userName;
    	}
    
    	public String getPassWord() {
    		return passWord;
    	}
    
    	public void setPassWord(String passWord) {
    		this.passWord = passWord;
    	}
    
    	public UserSexEnum getUserSex() {
    		return userSex;
    	}
    
    	public void setUserSex(UserSexEnum userSex) {
    		this.userSex = userSex;
    	}
    
    	public String getNickName() {
    		return nickName;
    	}
    
    	public void setNickName(String nickName) {
    		this.nickName = nickName;
    	}
    
    	@Override
    	public String toString() {
    		// TODO Auto-generated method stub
    		return "userName " + this.userName + ", pasword " + this.passWord + ", sex " + userSex.name();
    	}
    
    }
    
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    为了更接近生产我特地将 user_sex、nick_name 两个属性在数据库加了下划线和实体类属性名不一致,另外

    user_sex 使用了枚举。

    DROP TABLE IF EXISTS `users`;
    CREATE TABLE `users` (
      `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键id',
      `userName` varchar(32) DEFAULT NULL COMMENT '用户名',
      `passWord` varchar(32) DEFAULT NULL COMMENT '密码',
      `user_sex` varchar(32) DEFAULT NULL,
      `nick_name` varchar(32) DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
    
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    • @Select 是查询类的注解,所有的查询均使用这个

    • @Result 修饰返回的结果集,关联实体类属性和数据库字段一一对应,如果实体类属性和数据库属性名保持

      一致,就不需要这个属性来修饰。

    • @Insert 插入数据库使用,直接传入实体类会自动解析属性到对应的值

    • @Update 负责修改,也可以直接传入对象

    • @delete 负责删除

    了解更多属性参考这里:http://www.mybatis.org/mybatis-3/zh/java-api.html

    注意,使用#符号和$符号的不同:

    // This example creates a prepared statement, something like select * from teacher where name = ?;
    @Select("Select * from teacher where name = #{name}")
    Teacher selectTeachForGivenName(@Param("name") String name);
    
    // This example creates n inlined statement, something like select * from teacher where name = 'someName';
    @Select("Select * from teacher where name = '${name}'")
    Teacher selectTeachForGivenName(@Param("name") String name);
    
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    2.4 控制器

    package com.example.web;
    
    import com.example.mapper.UserMapper;
    import com.example.model.User;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    
    @RestController
    public class UserController {
    
        @Autowired
        private UserMapper userMapper;
    
        @RequestMapping("/getUsers")
        public List<User> getUsers() {
            List<User> users = userMapper.getAll();
            return users;
        }
    
        @RequestMapping("/getUser")
        public User getUser(Long id) {
            User user = userMapper.getOne(id);
            return user;
        }
    
        @RequestMapping("/add")
        public void save(User user) {
            userMapper.insert(user);
        }
    
        @RequestMapping(value = "update")
        public void update(User user) {
            userMapper.update(user);
        }
    
        @RequestMapping(value = "/delete/{id}")
        public void delete(@PathVariable("id") Long id) {
            userMapper.delete(id);
        }
    
    
    }
    
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    2.5 测试

    上面三步就基本完成了相关 Mapper 层开发,使用的时候当作普通的类注入进入就可以了。

    package com.example.mapper;
    
    import com.example.enums.UserSexEnum;
    import com.example.model.User;
    import org.junit.Assert;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    import java.util.List;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class UserMapperTest {
    
        @Autowired
        private UserMapper userMapper;
    
        @Test
        public void testInsert() throws Exception {
            userMapper.insert(new User("aa1", "a123456", UserSexEnum.MAN));
            userMapper.insert(new User("bb1", "b123456", UserSexEnum.WOMAN));
            userMapper.insert(new User("cc1", "b123456", UserSexEnum.WOMAN));
            Assert.assertEquals(3, userMapper.getAll().size());
        }
    
        @Test
        public void testQuery() throws Exception {
            List<User> users = userMapper.getAll();
            System.out.println(users.toString());
        }
    
    
        @Test
        public void testUpdate() throws Exception {
            User user = userMapper.getOne(1l);
            System.out.println(user.toString());
            user.setNickName("neo");
            userMapper.update(user);
            Assert.assertTrue(("neo".equals(userMapper.getOne(1l).getNickName())));
        }
    
    }
    
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    运行testInsert()

    在这里插入图片描述

    运行testQuery()

    [userName aa1, pasword a123456, sex MAN, userName bb1, pasword b123456, sex WOMAN, userName cc1, pasword b123456, sex WOMAN]
    
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    运行testUpdate()

    在这里插入图片描述

    3、极简xml版本

    极简 xml 版本保持映射文件的老传统,接口层只需要定义空方法,系统会自动根据方法名在映射文件中找对应的

    Sql。

    3.1 pom依赖

    
    <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0modelVersion>
        <parent>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-parentartifactId>
            <version>2.1.0.RELEASEversion>
            <relativePath/>
        parent>
    
        <groupId>com.examplegroupId>
        <artifactId>spring-boot-mybatis-xmlartifactId>
        <version>0.0.1-SNAPSHOTversion>
        <name>spring-boot-mybatis-xmlname>
        <description>spring-boot-mybatis-xmldescription>
    
        <properties>
            <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
            <java.version>1.8java.version>
        properties>
    
        <dependencies>
    
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-starter-webartifactId>
            dependency>
    
            <dependency>
                <groupId>org.mybatis.spring.bootgroupId>
                <artifactId>mybatis-spring-boot-starterartifactId>
                <version>2.0.0version>
            dependency>
    
            <dependency>
                <groupId>mysqlgroupId>
                <artifactId>mysql-connector-javaartifactId>
            dependency>
    
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-starter-testartifactId>
                <scope>testscope>
            dependency>
    
        dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.bootgroupId>
                    <artifactId>spring-boot-maven-pluginartifactId>
                plugin>
            plugins>
        build>
    
    project>
    
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    3.2 配置文件

    pom 文件和上个版本一样,只是application.properties新增以下配置

    mybatis.config-location=classpath:mybatis/mybatis-config.xml
    mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
    mybatis.type-aliases-package=com.example.model
    spring.datasource.url=jdbc:mysql://localhost:3306/test_user?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
    spring.datasource.username=root
    spring.datasource.password=root
    spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
    
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    指定了 Mybatis 基础配置文件和实体类映射文件的地址。

    mybatis-config.xml 配置

    
    DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
    	<typeAliases>
    		<typeAlias alias="Integer" type="java.lang.Integer" />
    		<typeAlias alias="Long" type="java.lang.Long" />
    		<typeAlias alias="HashMap" type="java.util.HashMap" />
    		<typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
    		<typeAlias alias="ArrayList" type="java.util.ArrayList" />
    		<typeAlias alias="LinkedList" type="java.util.LinkedList" />
    	typeAliases>
    configuration>
    
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    这里也可以添加一些 Mybatis 基础的配置。

    3.3 添加 User 的映射文件

    UserMapper.xml文件

    
    DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    <mapper namespace="com.example.mapper.UserMapper" >
        <resultMap id="BaseResultMap" type="com.example.model.User" >
            <id column="id" property="id" jdbcType="BIGINT" />
            <result column="userName" property="userName" jdbcType="VARCHAR" />
            <result column="passWord" property="passWord" jdbcType="VARCHAR" />
            <result column="user_sex" property="userSex" javaType="com.example.enums.UserSexEnum"/>
            <result column="nick_name" property="nickName" jdbcType="VARCHAR" />
        resultMap>
        
        <sql id="Base_Column_List" >
            id, userName, passWord, user_sex, nick_name
        sql>
    
        <select id="getAll" resultMap="BaseResultMap"  >
           SELECT 
           <include refid="Base_Column_List" />
    	   FROM users
        select>
    
        <select id="getOne" parameterType="java.lang.Long" resultMap="BaseResultMap" >
            SELECT 
           <include refid="Base_Column_List" />
    	   FROM users
    	   WHERE id = #{id}
        select>
    
        <insert id="insert" parameterType="com.example.model.User" >
           INSERT INTO 
           		users
           		(userName,passWord,user_sex) 
           	VALUES
           		(#{userName}, #{passWord}, #{userSex})
        insert>
        
        <update id="update" parameterType="com.example.model.User" >
           UPDATE 
           		users 
           SET 
           	<if test="userName != null">userName = #{userName},if>
           	<if test="passWord != null">passWord = #{passWord},if>
           	nick_name = #{nickName}
           WHERE 
           		id = #{id}
        update>
        
        <delete id="delete" parameterType="java.lang.Long" >
           DELETE FROM
           		 users 
           WHERE 
           		 id =#{id}
        delete>
    
    mapper>
    
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    其实就是把上个版本中 Mapper 的 Sql 搬到了这里的 xml 中了

    3.4 编写 Mapper 层的代码

    package com.example.mapper;
    
    import com.example.model.User;
    import org.springframework.stereotype.Component;
    
    import java.util.List;
    
    @Component
    public interface UserMapper {
    
        List<User> getAll();
    
        User getOne(Long id);
    
        void insert(User user);
    
        void update(User user);
    
        void delete(Long id);
    
    }
    
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    对比上一步,这里只需要定义接口方法。

    package com.example.enums;
    
    public enum UserSexEnum {
    	MAN, WOMAN
    }
    
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    package com.example.model;
    
    import com.example.enums.UserSexEnum;
    
    import java.io.Serializable;
    
    public class User implements Serializable {
    
        private static final long serialVersionUID = 1L;
        private Long id;
        private String userName;
        private String passWord;
        private UserSexEnum userSex;
        private String nickName;
    
        public User() {
            super();
        }
    
        public User(String userName, String passWord, UserSexEnum userSex) {
            super();
            this.passWord = passWord;
            this.userName = userName;
            this.userSex = userSex;
        }
    
        public Long getId() {
            return id;
        }
    
        public void setId(Long id) {
            this.id = id;
        }
    
        public String getUserName() {
            return userName;
        }
    
        public void setUserName(String userName) {
            this.userName = userName;
        }
    
        public String getPassWord() {
            return passWord;
        }
    
        public void setPassWord(String passWord) {
            this.passWord = passWord;
        }
    
        public UserSexEnum getUserSex() {
            return userSex;
        }
    
        public void setUserSex(UserSexEnum userSex) {
            this.userSex = userSex;
        }
    
        public String getNickName() {
            return nickName;
        }
    
        public void setNickName(String nickName) {
            this.nickName = nickName;
        }
    
        @Override
        public String toString() {
            return "userName " + this.userName + ", pasword " + this.passWord + "sex " + userSex.name();
        }
    
    }
    
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    3.5 控制器

    package com.example.web;
    
    import com.example.mapper.UserMapper;
    import com.example.model.User;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    @RestController
    public class UserController {
    
        @Autowired
        private UserMapper userMapper;
    
        @RequestMapping("/getUsers")
        public List<User> getUsers() {
            List<User> users = userMapper.getAll();
            return users;
        }
    
        @RequestMapping("/getUser")
        public User getUser(Long id) {
            User user = userMapper.getOne(id);
            return user;
        }
    
        @RequestMapping("/add")
        public void save(User user) {
            userMapper.insert(user);
        }
    
        @RequestMapping(value = "update")
        public void update(User user) {
            userMapper.update(user);
        }
    
        @RequestMapping(value = "/delete/{id}")
        public void delete(@PathVariable("id") Long id) {
            userMapper.delete(id);
        }
    
    
    }
    
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    3.6 启动类

    package com.example;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    @MapperScan("com.example.mapper")
    public class SpringBootMybatisXmlApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(SpringBootMybatisXmlApplication.class, args);
    	}
    }
    
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    3.7 测试

    package com.example.mapper;
    
    import com.example.enums.UserSexEnum;
    import com.example.model.User;
    import org.junit.Assert;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    import java.util.List;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class UserMapperTest {
    
        @Autowired
        private UserMapper userMapper;
    
        @Test
        public void testInsert() throws Exception {
            userMapper.insert(new User("aa1", "a123456", UserSexEnum.MAN));
            userMapper.insert(new User("bb1", "b123456", UserSexEnum.WOMAN));
            userMapper.insert(new User("cc1", "b123456", UserSexEnum.WOMAN));
            Assert.assertEquals(3, userMapper.getAll().size());
        }
    
        @Test
        public void testQuery() throws Exception {
            List<User> users = userMapper.getAll();
            System.out.println(users.toString());
        }
    
    
        @Test
        public void testUpdate() throws Exception {
            User user = userMapper.getOne(1l);
            System.out.println(user.toString());
            user.setNickName("neo");
            userMapper.update(user);
            Assert.assertTrue(("neo".equals(userMapper.getOne(1l).getNickName())));
        }
    
    }
    
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    package com.example.web;
    
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.http.MediaType;
    import org.springframework.test.context.junit4.SpringRunner;
    import org.springframework.test.web.servlet.MockMvc;
    import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
    import org.springframework.test.web.servlet.setup.MockMvcBuilders;
    import org.springframework.web.context.WebApplicationContext;
    
    import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class UserControllerTest {
    
        @Autowired
        private WebApplicationContext wac;
        private MockMvc mockMvc;
    
        @Before
        public void setUp() throws Exception {
            mockMvc = MockMvcBuilders.webAppContextSetup(wac).build(); //初始化MockMvc对象
        }
    
        @Test
        public void getUsers() throws Exception {
            mockMvc.perform(MockMvcRequestBuilders.post("/getUsers")
                    .accept(MediaType.APPLICATION_JSON_UTF8)).andDo(print());
        }
    
    }
    
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    运行getUsers()

                 Body = [{"id":1,"userName":"aa1","passWord":"a123456","userSex":"MAN","nickName":"neo"},{"id":2,"userName":"bb1","passWord":"b123456","userSex":"WOMAN","nickName":null},{"id":3,"userName":"cc1","passWord":"b123456","userSex":"WOMAN","nickName":null}]
    
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    4、如何选择

    两种模式各有特点,注解版适合简单快速的模式,其实像现在流行的这种微服务模式,一个微服务就会对应一个自

    已的数据库,多表连接查询的需求会大大的降低,会越来越适合这种模式。

    老传统模式比适合大型项目,可以灵活的动态生成 Sql ,方便调整 Sql ,也有痛痛快快,洋洋洒洒的写 Sql 的感

    觉。

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  • 原文地址:https://blog.csdn.net/qq_30614345/article/details/134297577