springboot 整合 mybatis 开发

最新推荐文章于 2025-06-02 09:40:08 发布

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本文详细介绍了如何在SpringBoot项目中整合MyBatis，包括pom.xml配置、application.yml配置、实体类、Mapper文件、Service层及Controller层的实现，通过具体示例展示了数据的插入操作。

springboot 整合 mybatis 开发

1.springboot项目能正常访问
在这里插入图片描述
2. pom.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.study</groupId>
    <artifactId>cdmy</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cdmy</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <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>

        <!--web项目-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.31</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.2</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.0</version>
        </dependency>

        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.23</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.6</version>
        </dependency>
        <dependency>
            <groupId>javax.transaction</groupId>
            <artifactId>javax.transaction-api</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.persistence</groupId>
            <artifactId>persistence-api</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.20</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.20</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>

</project>

springboot 的application.yml配置
需要注意声明的是，这个yml配置文件中的注释特别注意，如果加了中文注释，程序起来的时候，可能报错

server:
  port: 52000
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=PRC&useSSL=false
    username: root
    password: 123456
    initialSize: 1
    minIdle: 3
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 30000
    validationQuery: select 'x'
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    maxPoolPreparedStatementPerConnectionSize: 20
    filters: stat,wall,slf4j
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

mybatis:
  mapper-locations: classpath:com/study/cdmy/dao/mapping/*Mapper.xml
  type-aliases-package: com.study.cdmy
logging:
  com.study.cdmy
        level
         debug

编写代码 user类为例子

UserMapper.xml 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.study.cdmy.dao.UserMapper">

    <!---通用查询结果列-->
    <sql id="all_column">
	o.id,	o.username,	o.age
	</sql>

    <!---通用查询结果列-->
    <sql id="all_where">
        <if test="id != null ">
            and o.id = #{id}
        </if>
        <if test="username != null and username != '' ">
            and o.username = #{username}
        </if>
        <if test="age != null ">
            and o.age = #{age}
        </if>
    </sql>
    <!-- 插入一条记录,添加 （匹配有值的字段）-->
    <insert id="insert">
        INSERT INTO user
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">
                id,
            </if>
            <if test="username != null">
                username,
            </if>
            <if test="age != null">
                age,
            </if>

        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="id!=null">
                #{id},
            </if>
            <if test="username!=null">
                #{username},
            </if>
            <if test="age!=null">
                #{age},
            </if>
        </trim>
    </insert>


    <!-- 实体类与数据库字段映射-->
    <resultMap type="com.study.cdmy.entity.User" id="UserResultMap">
        <!-- 用id属性来映射主键字段 -->
        <id property="id" column="id"/>    <!-- 用result属性来映射非主键字段 -->
        <result property="username" column="username"/>
        <result property="age" column="age"/>
    </resultMap>

</mapper>

UserMapper.java

package com.study.cdmy.dao;

import com.study.cdmy.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;


/**
 * 
 * -数据库操作接口层
 * 
 **/
@Mapper
@Repository
public interface UserMapper{

    public int insert( User entity);
}

UserService.java

package com.study.cdmy.service;

import com.study.cdmy.entity.User;
import com.study.cdmy.dao.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 
 * -业务逻辑处理层
 * 
 **/
@Service
public class UserService{

    @Autowired
    UserMapper userMapper;

    public Integer insert(String username,Integer age){
        User user =new User(username,age);
        Integer ok = userMapper.insert(user);
        return ok;
    }

}

UserController.java

package com.study.cdmy.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.study.cdmy.service.UserService;
/**
* 控制层
* Created by cd
*/
@RestController
@RequestMapping(value = "/test",method = RequestMethod.POST)
public class UserController{
    @Autowired
    UserService userService;

    @RequestMapping(value = "test")
    public String test(){
        return "success";
    }

    /**
     * 
     * @param username
     * @param age
     * @return
     */
    @RequestMapping(value = "insert")
    public String insert(String username,Integer age){
        Integer insert = userService.insert(username, age);
        if(insert >0){
            return "插入成功";
        }else {
            return "插入失败";
        }
    }

}