springboot系列（八）springboot整合mybatis

　本篇介绍一下在springboot中整合mybatis ，使用mysql数据库，集成durid 连接池技术，全部代码是手动生成，没有使用代码生成器来构建代码。


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一、创建数据库和表

二、在pom中添加依赖

　<!-- 由于maven官方仓库在国外，本地更新很慢，建议使用中国的阿里仓库,在pom中添加如下配置 -->

<repositories><!-- 代码库 -->
    <repository>
        <id>maven-ali</id>
        <url>http://maven.aliyun.com/nexus/content/groups/public//</url>
        <releases>
            <enabled>true</enabled>
        </releases>
        <snapshots>
            <enabled>true</enabled>
            <updatePolicy>always</updatePolicy>
            <checksumPolicy>fail</checksumPolicy>
        </snapshots>
    </repository>
</repositories>


        <!-- Spring Boot Mybatis 依赖 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </dependency>

        <!-- MySQL 连接驱动依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>

        <!-- Druid 数据连接池依赖 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.9</version>
        </dependency>

三、添加数据源配置文件 application-dev.yml（dev对应的是开发环境的配置文件）

1、application-dev.yml

spring:
    datasource:
        url: jdbc:mysql://localhost:3306/springbootdb?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8
        username: root
        password: 187664
        type: com.alibaba.druid.pool.DruidDataSource
        #连接池的配置信息
        initialSize: 10
        minIdle: 10
        maxActive: 100
        maxWait: 60000
        timeBetweenEvictionRunsMillis: 60000
        minEvictableIdleTimeMillis: 300000
        validationQuery: SELECT 1 FROM DUAL
        testWhileIdle: true
        testOnBorrow: false
        testOnReturn: false
        poolPreparedStatements: true
        maxPoolPreparedStatementPerConnectionSize: 20

四、添加mybatis的配置文件

mybatis.xml

<?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>
    <settings>  
        <setting name="mapUnderscoreToCamelCase" value="true" /> 
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>
</configuration>

五、在springboot核心配置文件中配置数据源和mybatis

application.yml

#数据源配置
spring:
    profiles:
        active: dev
# Mybatis配置
mybatis:
    configLocation: classpath:mybatis.xml              #mybatis配置文件路径
    mapperLocations: classpath:mapper/**/*.xml  #所有mapper映射文件地址

六、分别创建entity、dao、service、controller 、mapper等文件，先来看看文档结构

1、user实体类

package com.chuhouqi.demo.entity;

import java.io.Serializable;

public class User implements Serializable {
    private String id;
    private String name;
    private String sex;
    private String age;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", age='" + age + '\'' +
                '}';
    }
}

2、dao接口

3、UserService接口

package com.chuhouqi.demo.service;

import com.chuhouqi.demo.entity.User;

public interface IUserService {

    public User getUser();
}

4、UserService接口的实现类

package com.chuhouqi.demo.service.impl;

import com.chuhouqi.demo.dao.IUserDao;
import com.chuhouqi.demo.entity.User;
import com.chuhouqi.demo.service.IUserService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service("userService")
public class UserServiceImpl implements IUserService {

    @Autowired
    private IUserDao userDao;

    @Override
    public User getUser() {
        return userDao.getUser();
    }
}

5、UserController类