StringBoot 整合Mybatis

1.SpringBoot 简介

1.1 Spring Team在现有Spring框架的基础上发布了一个创新的框架：Spring Boot。
1.2 Spring Boot的开发团队是：PivotalSpring Boot的主要作用是：简化开发，减少配置（简化配置和部署spring应用程序的过程）。
1.3 Spring Boot框架提倡：一键部署、习惯优于配置Spring Boot还是一个微框架，它与目1.4 前流行的微服务紧密联系，可以开发微应用。

2.引入依赖

<!-- 引入Mybatis依赖 -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.6</version>
</dependency>

<!-- 引入Mysql依赖 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.44</version>
</dependency>

<!-- 导入数据源C3p0 -->
<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.1</version>
</dependency>

<!-- spring Mybatis 整合包 -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>

3.配置数据源，和加载Mybatis配置

3.1.在application.properties中配置数据源

#配置数据源
spring.datasource.url=jdbc:mysql://localhost:3306/llmjsh?characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root

# 加载mybatis 配置
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.config-location=classpath:mybatis/mybatis-config.xml

比如这样！！！

4.在 src/main/resources 下创建 mybatis 文件夹，并在 mybatis 文件夹中创建 “mybatis-config.xml” 配置文件，内容如下：

<?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>
    <settings>
        <!-- 获取数据库自增主键值 -->
        <setting name="useGeneratedKeys" value="true"/>
        <!-- 使用列别名替换列名，默认为 true -->
        <setting name="useColumnLabel" value="true"/>
        <!-- 开启驼峰命名转换：Table(create_time) => Entity(createTime) -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

5.创建数据库

5.创建实体类

此处省略get，set

public class Student implements Serializable {
    private int uid;
    private String name;
    private String sex;
    private String age;
    private String address;
    }

6.创建dao接口

public interface Studentdao {
    Student studentAll();

}

7.创建Service

public interface StudentService { Student studentAll();
}

8.创建ServiceImpl 实现类

@Service("studentService")
public class StudentServiceImpl implements  StudentService{

    @Resource
    private Studentdao studentdao;

    @Override
    public Student studentAll() {
        return studentdao.studentAll();
    }
}

7.创建StudentMapper.xml

<?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.llmjsh.springboot1.dao.Studentdao">

    <select id="studentAll" resultType="com.llmjsh.springboot1.pojo.Student">
        select * from tb_Student
    </select>

</mapper>

8.在controller中调用

@Controller
public class StudentController {

    @Resource
    private StudentServiceImpl studentService;

    @RequestMapping(value = "/hello",produces="text/html;charset=UTF-8")
    @ResponseBody
    public Student Test(){
        Student students = studentService.studentAll();
        System.out.println(students);
        return students;
    }


}

9.运行输出结果如下

10.项目目录结构展示