Spring boot 整合 Mybatis 实现增删改查(MyEclipse版)

1、首先搭建好一个Spring boot 程序，编写好启动类。

启动类代码如下：

@SpringBootApplication
public class Start {public static void main(String[] args) {SpringApplication.run(Start.class, "--server.port=9999");//后面是直接设置端口号}
}

2、要整合mybatis需要引进依赖，顺便把热部署依赖也加上去，代码如下

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.6.RELEASE</version><relativePath /></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.1.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!-- 热部署 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><optional>true</optional></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><!-- 热部署 --><configuration><fork>true</fork></configuration></plugin></plugins></build>

　　3、依赖包下载完之后，添加配置文件application.properties内容如下：

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/cpt?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password =root

　　把它直接放到src/main/resources这个目录下就可以了。

4、加点mybatis配置文件mybatis-config.xml，代码如下

<?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><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>

　5、接下来就可以写实例，代码如下；

UserEntity.java

package root.entity;import java.io.Serializable;import root.enums.UserSexEnum;public class UserEntity implements Serializable {private static final long serialVersionUID = 1L;private Long id;private String userName;private String passWord;private UserSexEnum userSex;private String nickName;public UserEntity() {super();}public UserEntity(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;}@Overridepublic String toString() {// TODO Auto-generated method stubreturn "userName " + this.userName + ", pasword " + this.passWord + "sex " + userSex.name();}}

　　UserMapper.java

package root.mapper;import java.util.List;import root.entity.UserEntity;public interface UserMapper {List<UserEntity> getAll();UserEntity getOne(Long id);void insert(UserEntity user);void update(UserEntity user);void delete(Long id);}

　　他对应的xml文件代码如下：

<?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="root.mapper.UserMapper" ><resultMap id="BaseResultMap" type="root.entity.UserEntity" ><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="root.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 usersWHERE id = #{id}</select><insert id="insert" parameterType="root.entity.UserEntity" >INSERT INTO users(userName,passWord,user_sex) VALUES(#{userName}, #{passWord}, #{userSex})</insert><update id="update" parameterType="root.entity.UserEntity" >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 FROMusers WHERE id =#{id}</delete></mapper>

　　UserSexEnum.java

public enum UserSexEnum {MAN, WOMAN
}

　　UserController.java

package root.controller;import java.util.List;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 root.entity.UserEntity;
import root.mapper.UserMapper;@RestController
public class UserController {@Autowiredprivate UserMapper userMapper;@RequestMapping("/getUsers")public List<UserEntity> getUsers() {List<UserEntity> users=userMapper.getAll();return users;}@RequestMapping("/getUser")public UserEntity getUser(Long id) {UserEntity user=userMapper.getOne(id);return user;}@RequestMapping("/add")public void save(UserEntity user) {userMapper.insert(user);}@RequestMapping(value="update")public void update(UserEntity user) {userMapper.update(user);}@RequestMapping(value="/delete/{id}")public void delete(@PathVariable("id") Long id) {userMapper.delete(id);}}

6、最后在启动类里面加上@MapperScan("root.mapper")扫描进来

7、我的工程目录结构如下：

到这里一个简单的spring boot整合mybatis访问数据库实现增删改就好了

转载于:https://www.cnblogs.com/caopt/p/8488438.html

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