SpringBoot整合MyBatis（转）

其他 2018-07-03 22:20:18 阅读次数: 0

怎么说了，写博客虽然是一件很费时间的事情，而且还是个菜鸟，但是如果写的东西能够帮助到别人，还是值得开心的。

回顾：

上篇写了JdbcTemplate，但是想到使用Mybatis，JPA的人估计不少，所以这篇写一下SpringBoot整合Mybatis，JPA的话以后有时间再弄，因为自己也没用过。

一、数据准备

其实还是上篇的，以防有人是直接看这篇的，就还是贴出来吧。

  1. CREATE TABLE `tb_user` (
  2. `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  3. `username` varchar(50) NOT NULL COMMENT '用户名',
  4. `age` int(11) NOT NULL COMMENT '年龄',
  5. `ctm` datetime NOT NULL COMMENT '创建时间',
  6. PRIMARY KEY (`id`)
  7. ) ENGINE=InnoDB DEFAULT CHARSET=utf8
  1. INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('张三', '18', NOW()) ;
  2. INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('李四', '20', NOW()) ;
  3. INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('王五', '19', NOW()) ;

二、引入依赖

  1. <!-- Spring-Mybatis -->
  2. <dependency>
  3. <groupId>org.mybatis.spring.boot </groupId>
  4. <artifactId>mybatis-spring-boot-starter </artifactId>
  5. <version>1.3.0 </version>
  6. </dependency>
  8. <!-- MySQL -->
  9. <dependency>
  10. <groupId>mysql </groupId>
  11. <artifactId>mysql-connector-java </artifactId>
  12. </dependency>

另外web依赖也需要，因为我们采用MVC模式。

  1. <!-- Add typical dependencies for a web application -->
  2. <dependency>
  3. <groupId>org.springframework.boot </groupId>
  4. <artifactId>spring-boot-starter-web </artifactId>
  5. </dependency>

三、数据库配置文件

  1. spring:
  2. datasource:
  3. driver-class-name : com.mysql.jdbc.Driver
  4. url: jdbc: mysql: //localhost:3306/db_user
  5. username: root
  6. password: root

四、代码

最开始使用mybati比较麻烦，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。

于是两种使用方式都介绍一下，一、无配置注解版 二、配置文件版

1.无配置文件注解版

加入配置文件

  1. mybatis:
  2. type-aliases-package: cn .saytime .bean

这里写图片描述

实体类User.class

  1. package cn.saytime.bean;
  3. import java.util.Date;
  5. /**
  6. * @ClassName cn.saytime.bean.User
  7. * @Description
  8. * @date 2017-07-04 22:47:28
  9. */
  10. public class User {
  12. private int id;
  13. private String username;
  14. private int age;
  15. private Date ctm;
  17. public User() {
  18. }
  20. public User(String username, int age) {
  21. this.username = username;
  22. this.age = age;
  23. this.ctm = new Date();
  24. }
  26. // Getter、Setter
  27. }

UserMapper.class

  1. package cn.saytime.mapper;
  3. import cn.saytime.bean.User;
  4. import org.apache.ibatis.annotations.Delete;
  5. import org.apache.ibatis.annotations.Insert;
  6. import org.apache.ibatis.annotations.Param;
  7. import org.apache.ibatis.annotations.Select;
  8. import org.apache.ibatis.annotations.Update;
  10. import java.util.List;
  12. // @Mapper 这里可以使用@Mapper注解，但是每个mapper都加注解比较麻烦，所以统一配置@MapperScan在扫描路径在application类中
  13. public interface UserMapper {
  15. @Select ( "SELECT * FROM tb_user WHERE id = #{id}" )
  16. User getUserById(Integer id);
  18. @Select ( "SELECT * FROM tb_user" )
  19. public List<User> getUserList();
  21. @Insert ( "insert into tb_user(username, age, ctm) values(#{username}, #{age}, now())" )
  22. public int add(User user);
  24. @Update ( "UPDATE tb_user SET username = #{user.username} , age = #{user.age} WHERE id = #{id}" )
  25. public int update(@Param("id") Integer id, @Param("user") User user);
  27. @Delete ( "DELETE from tb_user where id = #{id} " )
  28. public int delete(Integer id);
  29. }

Mybatis 注解使用 http://www.mybatis.org/mybatis-3/zh/java-api.html

UserService.class

  1. package cn.saytime.service;
  3. import cn.saytime.bean.User;
  4. import org.springframework.stereotype.Service;
  6. import java.util.List;
  8. /**
  9. * @ClassName cn.saytime.service.UserService
  10. * @Description
  11. */
  12. public interface UserService {
  14. User getUserById(Integer id);
  16. public List<User> getUserList();
  18. public int add(User user);
  20. public int update(Integer id, User user);
  22. public int delete(Integer id);
  23. }

UserServiceimpl.class

  1. package cn .saytime .service .impl;
  3. import cn .saytime .bean .User;
  4. import cn .saytime .mapper .UserMapper;
  5. import cn .saytime .service .UserService;
  6. import org .springframework .beans .factory .annotation .Autowired;
  7. import org .springframework .stereotype .Service;
  9. import java .util .List;
  11. /**
  12. * @ClassName cn.saytime.service.impl.UserServiceImpl
  13. * @Description
  14. */
  15. @Service
  16. public class UserServiceImpl implements UserService {
  18. @Autowired
  19. private UserMapper userMapper;
  21. @Override
  22. public User getUserById(Integer id) {
  23. return userMapper .getUserById( id);
  24. }
  26. @Override
  27. public List<User> getUserList() {
  28. return userMapper .getUserList();
  29. }
  31. @Override
  32. public int add(User user) {
  33. return userMapper .add( user);
  34. }
  36. @Override
  37. public int update(Integer id, User user) {
  38. return userMapper .update( id, user);
  39. }
  41. @Override
  42. public int delete(Integer id) {
  43. return userMapper .delete( id);
  44. }
  45. }

JsonResult.class 通用json返回类

  1. package cn.saytime.bean;
  3. public class JsonResult {
  5. private String status = null;
  7. private Object result = null;
  9. public JsonResult status(String status) {
  10. this.status = status;
  11. return this;
  12. }
  14. // Getter Setter
  15. }

UserController.class（Restful风格）

  1. package cn.saytime.web;
  3. import cn.saytime.bean.JsonResult;
  4. import cn.saytime.bean.User;
  5. import cn.saytime.service.UserService;
  6. import org.springframework.beans.factory. annotation.Autowired;
  7. import org.springframework.http.HttpStatus;
  8. import org.springframework.http.ResponseEntity;
  9. import org.springframework.web.bind. annotation.PathVariable;
  10. import org.springframework.web.bind. annotation.RequestBody;
  11. import org.springframework.web.bind. annotation.RequestMapping;
  12. import org.springframework.web.bind. annotation.RequestMethod;
  13. import org.springframework.web.bind. annotation.RequestParam;
  14. import org.springframework.web.bind. annotation.RestController;
  16. import java.util.List;
  18. /**
  19. * @ClassName cn.saytime.web.UserController
  20. * @Description
  21. * @date 2017-07-04 22:46:14
  22. */
  23. @RestController
  24. public class UserController {
  26. @Autowired
  27. private UserService userService;
  29. /**
  30. * 根据ID查询用户
  31. * @param id
  32. * @return
  33. */
  34. @RequestMapping (value = "user/{id}" , method = RequestMethod.GET)
  35. public ResponseEntity<JsonResult> getUserById ( @PathVariable (value = "id" ) Integer id){
  36. JsonResult r = new JsonResult();
  37. try {
  38. User user = userService.getUserById(id);
  39. r.setResult(user);
  40. r.setStatus( "ok");
  41. } catch (Exception e) {
  42. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  43. r.setStatus( "error");
  44. e.printStackTrace();
  45. }
  46. return ResponseEntity.ok(r);
  47. }
  49. /**
  50. * 查询用户列表
  51. * @return
  52. */
  53. @RequestMapping (value = "users" , method = RequestMethod.GET)
  54. public ResponseEntity<JsonResult> getUserList (){
  55. JsonResult r = new JsonResult();
  56. try {
  57. List<User> users = userService.getUserList();
  58. r.setResult(users);
  59. r.setStatus( "ok");
  60. } catch (Exception e) {
  61. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  62. r.setStatus( "error");
  63. e.printStackTrace();
  64. }
  65. return ResponseEntity.ok(r);
  66. }
  68. /**
  69. * 添加用户
  70. * @param user
  71. * @return
  72. */
  73. @RequestMapping (value = "user" , method = RequestMethod.POST)
  74. public ResponseEntity<JsonResult> add ( @RequestBody User user){
  75. JsonResult r = new JsonResult();
  76. try {
  77. int orderId = userService.add(user);
  78. if (orderId < 0) {
  79. r.setResult(orderId);
  80. r.setStatus( "fail");
  81. } else {
  82. r.setResult(orderId);
  83. r.setStatus( "ok");
  84. }
  85. } catch (Exception e) {
  86. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  87. r.setStatus( "error");
  89. e.printStackTrace();
  90. }
  91. return ResponseEntity.ok(r);
  92. }
  94. /**
  95. * 根据id删除用户
  96. * @param id
  97. * @return
  98. */
  99. @RequestMapping (value = "user/{id}" , method = RequestMethod.DELETE)
  100. public ResponseEntity<JsonResult> delete ( @PathVariable (value = "id" ) Integer id){
  101. JsonResult r = new JsonResult();
  102. try {
  103. int ret = userService.delete(id);
  104. if (ret < 0) {
  105. r.setResult(ret);
  106. r.setStatus( "fail");
  107. } else {
  108. r.setResult(ret);
  109. r.setStatus( "ok");
  110. }
  111. } catch (Exception e) {
  112. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  113. r.setStatus( "error");
  115. e.printStackTrace();
  116. }
  117. return ResponseEntity.ok(r);
  118. }
  120. /**
  121. * 根据id修改用户信息
  122. * @param user
  123. * @return
  124. */
  125. @RequestMapping (value = "user/{id}" , method = RequestMethod.PUT)
  126. public ResponseEntity<JsonResult> update ( @PathVariable ( "id" ) Integer id, @RequestBody User user){
  127. JsonResult r = new JsonResult();
  128. try {
  129. int ret = userService.update(id, user);
  130. if (ret < 0) {
  131. r.setResult(ret);
  132. r.setStatus( "fail");
  133. } else {
  134. r.setResult(ret);
  135. r.setStatus( "ok");
  136. }
  137. } catch (Exception e) {
  138. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  139. r.setStatus( "error");
  141. e.printStackTrace();
  142. }
  143. return ResponseEntity.ok(r);
  144. }
  146. }

Application.java

  1. package cn.saytime;
  3. import org.mybatis.spring. annotation.MapperScan;
  4. import org.springframework.boot.SpringApplication;
  5. import org.springframework.boot.autoconfigure.SpringBootApplication;
  7. @SpringBootApplication
  8. @MapperScan ( "cn.saytime.mapper" )
  9. public class SpringbootMybaitsApplication {
  11. public static void main(String[] args) {
  12. SpringApplication.run(SpringbootMybaitsApplication. class, args);
  13. }
  14. }

使用PostMan通过测试。

2.配置文件版

加入配置文件

  1. mybatis:
  2. mapper- locations: classpath:mybatis /mapper/*.xml
  3. config- location: classpath:mybatis/mybatis-config.xml

项目目录结构：

这里写图片描述

代码部分，相比于上面那种方式，改变的只有配置文件以及下面几个部分。

UserMapper.class

  1. package cn .saytime .mapper;
  3. import cn .saytime .bean .User;
  4. import org .apache .ibatis .annotations .Delete;
  5. import org .apache .ibatis .annotations .Insert;
  6. import org .apache .ibatis .annotations .Param;
  7. import org .apache .ibatis .annotations .Select;
  8. import org .apache .ibatis .annotations .Update;
  9. import org .springframework .stereotype .Repository;
  11. import java .util .List;
  13. /**
  14. * @ClassName cn.saytime.mapper.UesrMapper
  15. * @Description
  16. */
  17. @Repository
  18. public interface UserMapper {
  20. User getUserById( Integer id);
  22. public List< User> getUserList();
  24. public int add( User user);
  26. public int update( @Param("id") Integer id, @Param("user") User user);
  28. public int delete( Integer id);
  29. }

mybatis-config.xml

  1. <?xml version="1.0" encoding="UTF-8" ?>
  2. <!DOCTYPE configuration
  3. PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  4. "http://mybatis.org/dtd/mybatis-3-config.dtd">
  5. <configuration>
  6. <typeAliases>
  7. </typeAliases>
  8. </configuration>

userMapper.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  3. <mapper namespace="cn.saytime.mapper.UserMapper" >
  4. <resultMap id="BaseResultMap" type="cn.saytime.bean.User" >
  5. <id column="id" property="id" jdbcType="INTEGER" />
  6. <result column="username" property="username" jdbcType="VARCHAR" />
  7. <result column="age" property="age" jdbcType="INTEGER" />
  8. <result column="ctm" property="ctm" jdbcType="TIMESTAMP"/>
  9. </resultMap>
  11. <sql id="Base_Column_List" >
  12. id, username, age, ctm
  13. </sql>
  15. <select id="getUserList" resultMap="BaseResultMap" >
  16. SELECT
  17. <include refid="Base_Column_List" />
  18. FROM tb_user
  19. </select>
  21. <select id="getUserById" parameterType="java.lang.Integer" resultMap="BaseResultMap" >
  22. SELECT
  23. <include refid="Base_Column_List" />
  24. FROM tb_user
  25. WHERE id = #{id}
  26. </select>
  28. <insert id="add" parameterType="cn.saytime.bean.User" >
  29. INSERT INTO
  30. tb_user
  31. (username,age,ctm)
  32. VALUES
  33. (#{username}, #{age}, now())
  34. </insert>
  36. <update id="update" parameterType="java.util.Map" >
  37. UPDATE
  38. tb_user
  39. SET
  40. username = #{user.username},age = #{user.age}
  41. WHERE
  42. id = #{id}
  43. </update>
  45. <delete id="delete" parameterType="java.lang.Integer" >
  46. DELETE FROM
  47. tb_user
  48. WHERE
  49. id = #{id}
  50. </delete>
  51. </mapper>

上面这种方式也使用PostMan通过测试。

五、简要说明

不知道大家有没有注意到一点，就是引入Springboot-mybatis依赖的时候，并不是spring官方的starter，往常的springboot集成的依赖，比如web，redis等，groupId以及artifactId的地址如下：

  1. <dependency>
  2. <groupId>org.springframework.boot </groupId>
  3. <artifactId>spring-boot-starter-web </artifactId>
  4. </dependency>

而这里是mybatis为spring提供的starter依赖，所以依赖地址是：

  1. <dependency>
  2. <groupId>org.mybatis.spring.boot </groupId>
  3. <artifactId>mybatis-spring-boot-starter </artifactId>
  4. <version>1.3.0 </version>
  5. </dependency>

而且值得注意的是，这里必须要指定版本号，往常我们使用springboot之所以不需要指定版本号，是因为我们引入的Maven Parent 中指定了SpringBoot的依赖，SpringBoot官方依赖Pom文件中已经指定了它自己集成的第三方依赖的版本号，对于Mybatis，Spring官方并没有提供自己的starter，所以必须跟正常的maven依赖一样，要加版本号。

SpringBoot自己集成的starter依赖，可以查看 http://docs.spring.io/spring-boot/docs/1.5.4.RELEASE/reference/htmlsingle/#using-boot-starter

版权声明：本文为博主原创文章，转载请注明出处http://blog.csdn.net/saytime https://blog.csdn.net/saytime/article/details/74783296

怎么说了，写博客虽然是一件很费时间的事情，而且还是个菜鸟，但是如果写的东西能够帮助到别人，还是值得开心的。

回顾：

上篇写了JdbcTemplate，但是想到使用Mybatis，JPA的人估计不少，所以这篇写一下SpringBoot整合Mybatis，JPA的话以后有时间再弄，因为自己也没用过。

一、数据准备

其实还是上篇的，以防有人是直接看这篇的，就还是贴出来吧。

  1. CREATE TABLE `tb_user` (
  2. `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  3. `username` varchar(50) NOT NULL COMMENT '用户名',
  4. `age` int(11) NOT NULL COMMENT '年龄',
  5. `ctm` datetime NOT NULL COMMENT '创建时间',
  6. PRIMARY KEY (`id`)
  7. ) ENGINE=InnoDB DEFAULT CHARSET=utf8
  1. INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('张三', '18', NOW()) ;
  2. INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('李四', '20', NOW()) ;
  3. INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('王五', '19', NOW()) ;

二、引入依赖

  1. <!-- Spring-Mybatis -->
  2. <dependency>
  3. <groupId>org.mybatis.spring.boot </groupId>
  4. <artifactId>mybatis-spring-boot-starter </artifactId>
  5. <version>1.3.0 </version>
  6. </dependency>
  8. <!-- MySQL -->
  9. <dependency>
  10. <groupId>mysql </groupId>
  11. <artifactId>mysql-connector-java </artifactId>
  12. </dependency>

另外web依赖也需要，因为我们采用MVC模式。

  1. <!-- Add typical dependencies for a web application -->
  2. <dependency>
  3. <groupId>org.springframework.boot </groupId>
  4. <artifactId>spring-boot-starter-web </artifactId>
  5. </dependency>

三、数据库配置文件

  1. spring:
  2. datasource:
  3. driver-class-name : com.mysql.jdbc.Driver
  4. url: jdbc: mysql: //localhost:3306/db_user
  5. username: root
  6. password: root

四、代码

最开始使用mybati比较麻烦，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。

于是两种使用方式都介绍一下，一、无配置注解版 二、配置文件版

1.无配置文件注解版

加入配置文件

  1. mybatis:
  2. type-aliases-package: cn .saytime .bean

这里写图片描述

实体类User.class

  1. package cn.saytime.bean;
  3. import java.util.Date;
  5. /**
  6. * @ClassName cn.saytime.bean.User
  7. * @Description
  8. * @date 2017-07-04 22:47:28
  9. */
  10. public class User {
  12. private int id;
  13. private String username;
  14. private int age;
  15. private Date ctm;
  17. public User() {
  18. }
  20. public User(String username, int age) {
  21. this.username = username;
  22. this.age = age;
  23. this.ctm = new Date();
  24. }
  26. // Getter、Setter
  27. }

UserMapper.class

  1. package cn.saytime.mapper;
  3. import cn.saytime.bean.User;
  4. import org.apache.ibatis.annotations.Delete;
  5. import org.apache.ibatis.annotations.Insert;
  6. import org.apache.ibatis.annotations.Param;
  7. import org.apache.ibatis.annotations.Select;
  8. import org.apache.ibatis.annotations.Update;
  10. import java.util.List;
  12. // @Mapper 这里可以使用@Mapper注解，但是每个mapper都加注解比较麻烦，所以统一配置@MapperScan在扫描路径在application类中
  13. public interface UserMapper {
  15. @Select ( "SELECT * FROM tb_user WHERE id = #{id}" )
  16. User getUserById(Integer id);
  18. @Select ( "SELECT * FROM tb_user" )
  19. public List<User> getUserList();
  21. @Insert ( "insert into tb_user(username, age, ctm) values(#{username}, #{age}, now())" )
  22. public int add(User user);
  24. @Update ( "UPDATE tb_user SET username = #{user.username} , age = #{user.age} WHERE id = #{id}" )
  25. public int update(@Param("id") Integer id, @Param("user") User user);
  27. @Delete ( "DELETE from tb_user where id = #{id} " )
  28. public int delete(Integer id);
  29. }

Mybatis 注解使用 http://www.mybatis.org/mybatis-3/zh/java-api.html

UserService.class

  1. package cn.saytime.service;
  3. import cn.saytime.bean.User;
  4. import org.springframework.stereotype.Service;
  6. import java.util.List;
  8. /**
  9. * @ClassName cn.saytime.service.UserService
  10. * @Description
  11. */
  12. public interface UserService {
  14. User getUserById(Integer id);
  16. public List<User> getUserList();
  18. public int add(User user);
  20. public int update(Integer id, User user);
  22. public int delete(Integer id);
  23. }

UserServiceimpl.class

  1. package cn .saytime .service .impl;
  3. import cn .saytime .bean .User;
  4. import cn .saytime .mapper .UserMapper;
  5. import cn .saytime .service .UserService;
  6. import org .springframework .beans .factory .annotation .Autowired;
  7. import org .springframework .stereotype .Service;
  9. import java .util .List;
  11. /**
  12. * @ClassName cn.saytime.service.impl.UserServiceImpl
  13. * @Description
  14. */
  15. @Service
  16. public class UserServiceImpl implements UserService {
  18. @Autowired
  19. private UserMapper userMapper;
  21. @Override
  22. public User getUserById(Integer id) {
  23. return userMapper .getUserById( id);
  24. }
  26. @Override
  27. public List<User> getUserList() {
  28. return userMapper .getUserList();
  29. }
  31. @Override
  32. public int add(User user) {
  33. return userMapper .add( user);
  34. }
  36. @Override
  37. public int update(Integer id, User user) {
  38. return userMapper .update( id, user);
  39. }
  41. @Override
  42. public int delete(Integer id) {
  43. return userMapper .delete( id);
  44. }
  45. }

JsonResult.class 通用json返回类

  1. package cn.saytime.bean;
  3. public class JsonResult {
  5. private String status = null;
  7. private Object result = null;
  9. public JsonResult status(String status) {
  10. this.status = status;
  11. return this;
  12. }
  14. // Getter Setter
  15. }

UserController.class（Restful风格）

  1. package cn.saytime.web;
  3. import cn.saytime.bean.JsonResult;
  4. import cn.saytime.bean.User;
  5. import cn.saytime.service.UserService;
  6. import org.springframework.beans.factory. annotation.Autowired;
  7. import org.springframework.http.HttpStatus;
  8. import org.springframework.http.ResponseEntity;
  9. import org.springframework.web.bind. annotation.PathVariable;
  10. import org.springframework.web.bind. annotation.RequestBody;
  11. import org.springframework.web.bind. annotation.RequestMapping;
  12. import org.springframework.web.bind. annotation.RequestMethod;
  13. import org.springframework.web.bind. annotation.RequestParam;
  14. import org.springframework.web.bind. annotation.RestController;
  16. import java.util.List;
  18. /**
  19. * @ClassName cn.saytime.web.UserController
  20. * @Description
  21. * @date 2017-07-04 22:46:14
  22. */
  23. @RestController
  24. public class UserController {
  26. @Autowired
  27. private UserService userService;
  29. /**
  30. * 根据ID查询用户
  31. * @param id
  32. * @return
  33. */
  34. @RequestMapping (value = "user/{id}" , method = RequestMethod.GET)
  35. public ResponseEntity<JsonResult> getUserById ( @PathVariable (value = "id" ) Integer id){
  36. JsonResult r = new JsonResult();
  37. try {
  38. User user = userService.getUserById(id);
  39. r.setResult(user);
  40. r.setStatus( "ok");
  41. } catch (Exception e) {
  42. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  43. r.setStatus( "error");
  44. e.printStackTrace();
  45. }
  46. return ResponseEntity.ok(r);
  47. }
  49. /**
  50. * 查询用户列表
  51. * @return
  52. */
  53. @RequestMapping (value = "users" , method = RequestMethod.GET)
  54. public ResponseEntity<JsonResult> getUserList (){
  55. JsonResult r = new JsonResult();
  56. try {
  57. List<User> users = userService.getUserList();
  58. r.setResult(users);
  59. r.setStatus( "ok");
  60. } catch (Exception e) {
  61. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  62. r.setStatus( "error");
  63. e.printStackTrace();
  64. }
  65. return ResponseEntity.ok(r);
  66. }
  68. /**
  69. * 添加用户
  70. * @param user
  71. * @return
  72. */
  73. @RequestMapping (value = "user" , method = RequestMethod.POST)
  74. public ResponseEntity<JsonResult> add ( @RequestBody User user){
  75. JsonResult r = new JsonResult();
  76. try {
  77. int orderId = userService.add(user);
  78. if (orderId < 0) {
  79. r.setResult(orderId);
  80. r.setStatus( "fail");
  81. } else {
  82. r.setResult(orderId);
  83. r.setStatus( "ok");
  84. }
  85. } catch (Exception e) {
  86. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  87. r.setStatus( "error");
  89. e.printStackTrace();
  90. }
  91. return ResponseEntity.ok(r);
  92. }
  94. /**
  95. * 根据id删除用户
  96. * @param id
  97. * @return
  98. */
  99. @RequestMapping (value = "user/{id}" , method = RequestMethod.DELETE)
  100. public ResponseEntity<JsonResult> delete ( @PathVariable (value = "id" ) Integer id){
  101. JsonResult r = new JsonResult();
  102. try {
  103. int ret = userService.delete(id);
  104. if (ret < 0) {
  105. r.setResult(ret);
  106. r.setStatus( "fail");
  107. } else {
  108. r.setResult(ret);
  109. r.setStatus( "ok");
  110. }
  111. } catch (Exception e) {
  112. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  113. r.setStatus( "error");
  115. e.printStackTrace();
  116. }
  117. return ResponseEntity.ok(r);
  118. }
  120. /**
  121. * 根据id修改用户信息
  122. * @param user
  123. * @return
  124. */
  125. @RequestMapping (value = "user/{id}" , method = RequestMethod.PUT)
  126. public ResponseEntity<JsonResult> update ( @PathVariable ( "id" ) Integer id, @RequestBody User user){
  127. JsonResult r = new JsonResult();
  128. try {
  129. int ret = userService.update(id, user);
  130. if (ret < 0) {
  131. r.setResult(ret);
  132. r.setStatus( "fail");
  133. } else {
  134. r.setResult(ret);
  135. r.setStatus( "ok");
  136. }
  137. } catch (Exception e) {
  138. r.setResult(e.getClass().getName() + ":" + e.getMessage());
  139. r.setStatus( "error");
  141. e.printStackTrace();
  142. }
  143. return ResponseEntity.ok(r);
  144. }
  146. }

Application.java

  1. package cn.saytime;
  3. import org.mybatis.spring. annotation.MapperScan;
  4. import org.springframework.boot.SpringApplication;
  5. import org.springframework.boot.autoconfigure.SpringBootApplication;
  7. @SpringBootApplication
  8. @MapperScan ( "cn.saytime.mapper" )
  9. public class SpringbootMybaitsApplication {
  11. public static void main(String[] args) {
  12. SpringApplication.run(SpringbootMybaitsApplication. class, args);
  13. }
  14. }

使用PostMan通过测试。

2.配置文件版

加入配置文件

  1. mybatis:
  2. mapper- locations: classpath:mybatis /mapper/*.xml
  3. config- location: classpath:mybatis/mybatis-config.xml

项目目录结构：

这里写图片描述

代码部分，相比于上面那种方式，改变的只有配置文件以及下面几个部分。

UserMapper.class

  1. package cn .saytime .mapper;
  3. import cn .saytime .bean .User;
  4. import org .apache .ibatis .annotations .Delete;
  5. import org .apache .ibatis .annotations .Insert;
  6. import org .apache .ibatis .annotations .Param;
  7. import org .apache .ibatis .annotations .Select;
  8. import org .apache .ibatis .annotations .Update;
  9. import org .springframework .stereotype .Repository;
  11. import java .util .List;
  13. /**
  14. * @ClassName cn.saytime.mapper.UesrMapper
  15. * @Description
  16. */
  17. @Repository
  18. public interface UserMapper {
  20. User getUserById( Integer id);
  22. public List< User> getUserList();
  24. public int add( User user);
  26. public int update( @Param("id") Integer id, @Param("user") User user);
  28. public int delete( Integer id);
  29. }

mybatis-config.xml

  1. <?xml version="1.0" encoding="UTF-8" ?>
  2. <!DOCTYPE configuration
  3. PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  4. "http://mybatis.org/dtd/mybatis-3-config.dtd">
  5. <configuration>
  6. <typeAliases>
  7. </typeAliases>
  8. </configuration>

userMapper.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  3. <mapper namespace="cn.saytime.mapper.UserMapper" >
  4. <resultMap id="BaseResultMap" type="cn.saytime.bean.User" >
  5. <id column="id" property="id" jdbcType="INTEGER" />
  6. <result column="username" property="username" jdbcType="VARCHAR" />
  7. <result column="age" property="age" jdbcType="INTEGER" />
  8. <result column="ctm" property="ctm" jdbcType="TIMESTAMP"/>
  9. </resultMap>
  11. <sql id="Base_Column_List" >
  12. id, username, age, ctm
  13. </sql>
  15. <select id="getUserList" resultMap="BaseResultMap" >
  16. SELECT
  17. <include refid="Base_Column_List" />
  18. FROM tb_user
  19. </select>
  21. <select id="getUserById" parameterType="java.lang.Integer" resultMap="BaseResultMap" >
  22. SELECT
  23. <include refid="Base_Column_List" />
  24. FROM tb_user
  25. WHERE id = #{id}
  26. </select>
  28. <insert id="add" parameterType="cn.saytime.bean.User" >
  29. INSERT INTO
  30. tb_user
  31. (username,age,ctm)
  32. VALUES
  33. (#{username}, #{age}, now())
  34. </insert>
  36. <update id="update" parameterType="java.util.Map" >
  37. UPDATE
  38. tb_user
  39. SET
  40. username = #{user.username},age = #{user.age}
  41. WHERE
  42. id = #{id}
  43. </update>
  45. <delete id="delete" parameterType="java.lang.Integer" >
  46. DELETE FROM
  47. tb_user
  48. WHERE
  49. id = #{id}
  50. </delete>
  51. </mapper>

上面这种方式也使用PostMan通过测试。

五、简要说明

不知道大家有没有注意到一点，就是引入Springboot-mybatis依赖的时候，并不是spring官方的starter，往常的springboot集成的依赖，比如web，redis等，groupId以及artifactId的地址如下：

  1. <dependency>
  2. <groupId>org.springframework.boot </groupId>
  3. <artifactId>spring-boot-starter-web </artifactId>
  4. </dependency>

而这里是mybatis为spring提供的starter依赖，所以依赖地址是：

  1. <dependency>
  2. <groupId>org.mybatis.spring.boot </groupId>
  3. <artifactId>mybatis-spring-boot-starter </artifactId>
  4. <version>1.3.0 </version>
  5. </dependency>

而且值得注意的是，这里必须要指定版本号，往常我们使用springboot之所以不需要指定版本号，是因为我们引入的Maven Parent 中指定了SpringBoot的依赖，SpringBoot官方依赖Pom文件中已经指定了它自己集成的第三方依赖的版本号，对于Mybatis，Spring官方并没有提供自己的starter，所以必须跟正常的maven依赖一样，要加版本号。

SpringBoot自己集成的starter依赖，可以查看 http://docs.spring.io/spring-boot/docs/1.5.4.RELEASE/reference/htmlsingle/#using-boot-starter

版权声明：本文为博主原创文章，转载请注明出处http://blog.csdn.net/saytime https://blog.csdn.net/saytime/article/details/74783296

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