SpringBoot使用mybatis
1.导入 MyBatis 所需要的依赖
<!--mybatis-spring-boot-starter:整合--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.4</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
2.配置数据库连接信息(application.properties)
spring.datasource.username=rootspring.datasource.password=123spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8spring.datasource.driver-class-name=com.mysql.jdbc.Driver
测试：
@SpringBootTestclass Springboot05MybatisApplicationTests { @Autowired DataSource dataSource; @Test void contextLoads() throws SQLException { System.out.println(dataSource.getClass()); System.out.println(dataSource.getConnection()); } }
打印出：class com.zaxxer.hikari.HikariDataSourceHikariProxyConnection@1172943149 wrapping com.mysql.jdbc.JDBC4Connection@3dc95b8b
说明配置完成
3.然后进行crud操作：
先编写一个实体类：（注意这里使用了lombok插件)
import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import org.springframework.beans.factory.annotation.Autowired; @Data@AllArgsConstructor@NoArgsConstructorpublic class User { private int id; private String name; private String pwd; }
创建mapper目录以及对应的 Mapper 接口
import com.chen.pojo.User;import org.apache.ibatis.annotations.Mapper;import org.springframework.stereotype.Repository; import java.util.List; //这个注解表示了这时一个mybatis的mapper类：Dao@Mapper @Repositorypublic interface UserMapper { List<User> queryUserList(); User queryUserById(int id); int addUSer(User user); int updateUser(User user); int deleteUser(int id); }
对应的Mapper映射文件
<?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.chen.mapper.UserMapper"> <!--select查询语句--> <!--id为方法名,resultType为结果返回类型--> <select id="queryUserList" resultType="User"> select * from mybatis.user; </select> <!--通过id进行select查询语句，parameterType为传参类型，resultType为结果返回类型--> <select id="queryUserById" parameterType="int" resultType="User"> select *from mybatis.user where id=#{id}; </select> <!--插入语句，对象中的属性，可以直接取出来--> <insert id="addUSer" parameterType="User" > insert into mybatis.user(name,pwd) values (#{name},#{pwd}); </insert> <!--更改用户语句--> <insert id="updateUser" parameterType="User" > update mybatis.user set name =#{name},pwd=#{pwd} where id=#{id}; </insert> <!--删除用户--> <delete id="deleteUser" parameterType="int"> delete from mybatis.user where id=#{id}; </delete> </mapper>
编写用户的UserController 进行测试！
import com.chen.mapper.UserMapper;import com.chen.pojo.User;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestControllerpublic class UserController { @Autowired private UserMapper userMapper; @GetMapping("/queryUserList") public List<User> queryUserList(){ List<User> userList=userMapper.queryUserList(); for(User user:userList){ System.out.println(user); } return userList; } //添加一个用户 @GetMapping("/addUser") public String addUser(){ int n=userMapper.addUSer(new User(5,"阿毛","4566977")); return String.valueOf(n); } //修改一个用户 @GetMapping("/updateUser") public String updateUser(){ int n=userMapper.updateUser(new User(5,"阿毛","4566977")); return String.valueOf(n); } //删除一个用户 @GetMapping("/deleteUser") public String deleteUser(){ int n=userMapper.deleteUser(18); return String.valueOf(n); } }
最后创建该实体类数据库：mybatis
DROP TABLE IF EXISTS `user`;CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(25) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL, `pwd` varchar(25) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE) ENGINE = InnoDB AUTO_INCREMENT = 18 CHARACTER SET = gbk COLLATE = gbk_chinese_ci ROW_FORMAT = Compact; -- ------------------------------ Records of user-- ----------------------------INSERT INTO `user` VALUES (3, '小黑', '789');INSERT INTO `user` VALUES (4, '可可2', '151');INSERT INTO `user` VALUES (5, '阿毛', '4566977');INSERT INTO `user` VALUES (6, '小明', 'cafa1414f');INSERT INTO `user` VALUES (7, '嘻嘻3', '101112');INSERT INTO `user` VALUES (8, '很爱很爱你', '101112');INSERT INTO `user` VALUES (9, '小霞', '159');INSERT INTO `user` VALUES (10, '嘻嘻5', '101112');INSERT INTO `user` VALUES (11, '陈锦贤', 'dad45');INSERT INTO `user` VALUES (12, '陈锦贤2', 'd2ad45');INSERT INTO `user` VALUES (13, '小明', '123456');INSERT INTO `user` VALUES (14, '小明2', '456');INSERT INTO `user` VALUES (17, '阿毛', '4566977'); SET FOREIGN_KEY_CHECKS = 1;
然后就可以启动项目进行测试了：
浏览器打开：
http://localhost:8080/queryUserList
其它的删除，添加，修改也是如此！
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莫找借口失败，只找理由成功。(不为失败找理由，要为成功找方法)
