记录-springcloud -mybatis(代码)

代码部分：

1:pom文件

<?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>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-mybatis</name>
    <packaging>war</packaging>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.0</version>
        </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.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
    <!--spring-boot  整合 mybatis -->
       <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
    <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2：entity 包 里 的 是 实体类：随便写几个属性

package com.entity;

import java.io.Serializable;

public class User implements Serializable {

    private String name;
    private  String  age;

    public String getName() {
        return name;
    }

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

    public String getAge() {
        return age;
    }

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

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

3：mapper文件：

package com.mapper;

import com.entity.User;
import java.util.List;

import org.springframework.stereotype.Repository;

@Repository
public interface UserDao {

    public List<User> findAll();

    public  List<User> findOrd(String age);
}

4：service

package com.service;

import com.entity.User;
import com.mapper.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserService {
    /**
     * 根据接口查询所用的用户
     */
    @Autowired
    UserDao userDao;

    public List<User> findAllUser(){
        List<User> all = userDao.findAll();
        return all;
    };

    /*查寻所有的age大于12 的人的信息*/
    public  List<User> findOrd(String age){
        List<User> userDaoOrd = userDao.findOrd(age);
        return  userDaoOrd;
    }
}

5:controller

package com.controller;

import com.entity.User;
import com.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/user")
public class Test_controller {
    @Autowired
    private UserService userService;

    @RequestMapping("/getuser")
    public List<User> getUser() {
        List<User> list = userService.findAllUser();
        System.out.println(list);
        return list;
    }

     @RequestMapping("/order")
        public List<User> getOrder(){
        String age = "12";
        List<User> list = userService.findOrd(age);
        return  list;
     }
    }

6:启动类（启动类的位置要在所有的包的上一级，且不能直接放在Java包的下面，需要建一个包放）

package com.controller;

import com.entity.User;
import com.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/user")
public class Test_controller {
    @Autowired
    private UserService userService;

    @RequestMapping("/getuser")
    public List<User> getUser() {
        List<User> list = userService.findAllUser();
        System.out.println(list);
        return list;
    }

     @RequestMapping("/order")
        public List<User> getOrder(){
        String age = "12";
        List<User> list = userService.findOrd(age);
        return  list;
     }
    }

7：resouse文件夹下的mapper文件的内容

<?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.mapper.UserDao">

    <resultMap id="BaseResultMap" type="com.entity.User">
        <result column="name" jdbcType="VARCHAR" property="name" />
        <result column="age" jdbcType="VARCHAR" property="age" />
    </resultMap>

    <select id="findAll" resultType="com.entity.User">
        select * from user
    </select>

    <!--查询年龄大于 12 的所有user的信息  parameterType:传递参数的类型  resultType:返回值类型    -->
    <select id="findOrd" parameterType="String" resultType="com.entity.User">
        select * from user where age > #{age}
    </select>

</mapper>

8：application.yml

#默认使用配置
spring:
  profiles:
    active: dev

9:application-dev.yml　　(库是：test　　表是:user)

server:
  port: 8080

spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/test?userUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver

mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml
  type-aliases-package: com.entity

#showSql
logging:
  level:
    com:
      example:
        mapper : debug