002-cloud8-8001子模組-改pom-建yml-建庫建表

阿新 • • 發佈：2020-07-27

 1 <dependencies>
 2 
 3         <!--web/actuator這兩個一般一起使用，寫在一起-->
 4         <dependency>
 5             <groupId>org.springframework.boot</groupId>
 6             <artifactId>spring-boot-starter-web</artifactId>
 7         </dependency>
 8         <!--監控-->
 9 
         <dependency>
10             <groupId>org.springframework.boot</groupId>
11             <artifactId>spring-boot-starter-actuator</artifactId>
12         </dependency>
13 
14         <!--Mybatis和SpringBoot的整合-->
15         <dependency>
16             <groupId>org.mybatis.spring.boot</groupId>
17 
             <artifactId>mybatis-spring-boot-starter</artifactId>
18         </dependency>
19 
20         <dependency>
21             <groupId>com.alibaba</groupId>
22             <artifactId>druid</artifactId>
23             <!--如果沒寫版本,從父層面找,找到了就直接用,全域性統一-->
24 
         </dependency>
25 
26         <!--mysql-connector-java-->
27         <dependency>
28             <groupId>mysql</groupId>
29             <artifactId>mysql-connector-java</artifactId>
30         </dependency>
31         <!--jdbc-->
32         <dependency>
33             <groupId>org.springframework.boot</groupId>
34             <artifactId>spring-boot-starter-jdbc</artifactId>
35         </dependency>
36         <!--熱部署-->
37         <dependency>
38             <groupId>org.springframework.boot</groupId>
39             <artifactId>spring-boot-devtools</artifactId>
40             <scope>runtime</scope>
41             <optional>true</optional>
42         </dependency>
43         <dependency>
44             <groupId>org.projectlombok</groupId>
45             <artifactId>lombok</artifactId>
46             <optional>true</optional>
47         </dependency>
48         <dependency>
49             <groupId>org.springframework.boot</groupId>
50             <artifactId>spring-boot-starter-test</artifactId>
51             <scope>test</scope>
52         </dependency>
53     </dependencies>

8001專案-pom依賴

這裡，需要先去建立一個db2019的資料庫，設定的名字密碼要保持一致。推薦用navicat軟體，輕便簡單。

 1 # 微服務埠號
 2 server:
 3   port: 8001
 4 
 5 # 微服務名稱
 6 spring:
 7   application:
 8     name: cloud-payment-service
 9 
10   datasource:
11     type: com.alibaba.druid.pool.DruidDataSource      # 資料來源
12     driver-class-name: com.mysql.jdbc.Driver   # mysql驅動包  這裡報錯就在左側External Libraries欄找mysql下的Driver
13     url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=UTF-8&useSSL=false
14     username: root
15     password: 123456
16 
17 
18 mybatis:
19   mapper-locations: classpath:mapper/*.xml  # 掃描類路徑下mapper資料夾下的.xml配置檔案
20   type-aliases-package: com.atguigu.springcloud.entities  # 該包所有Entity類，取預設別名

yml檔案內容

 1 import org.springframework.boot.SpringApplication;
 2 import org.springframework.boot.autoconfigure.SpringBootApplication;
 3 
 4 @SpringBootApplication
 5 public class PaymentMain8001 {
 6     public static void main(String[] args) {
 7         SpringApplication.run(PaymentMain8001.class,args);
 8     }
 9     
10 }

8001啟動類

CREATE TABLE payment (
        id BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT 'ID', 
        serial VARCHAR(200) DEFAULT'', 
        PRIMARY KEY(id)
    )ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8

navicat建表

這裡要注意的是，有些工具是需要單引號，有些是需要雙引號，而navicat裡，欄位，表名都是不需要引號的。

 1 import lombok.AllArgsConstructor;
 2 import lombok.Data;
 3 import lombok.NoArgsConstructor;
 4 
 5 import java.io.Serializable;
 6 
 7 /** 先在IDEA搜lombok外掛安裝，否則這三個用不了*/
 8 @Data
 9 @AllArgsConstructor
10 @NoArgsConstructor
11 public class Payment implements Serializable {
12     private Long id; //Long  非long
13     private String serial;
14 }

Payment類

 1 package com.atguigu.springcloud.entities;
 2 
 3 import lombok.AllArgsConstructor;
 4 import lombok.Data;
 5 import lombok.NoArgsConstructor;
 6 
 7 
 8 @Data
 9 @AllArgsConstructor
10 @NoArgsConstructor
11 public class CommonResult<T> {
12 
13     //404 not_found：Integer String
14     private Integer code;
15     private String message;
16 
17     //這不是針對某一個實體類的Josn串封裝類
18     private T data;
19 
20     //當T是null時，定義一個兩個引數的構造
21     public CommonResult(Integer code, String message){
22         this(code, message, null); //資料體 預設為null
23     }
24 
25 }

CommonResult

 1 /**
 2  * 如果是用mybatis 建議用Mapper註解，  repository插入時容易翻車
 3  */
 4 @Mapper
 5 public interface PaymentDao {
 6 //    常用的讀寫方法
 7     public int create(Payment payment);
 8     public Payment getPaymentById(@Param("id") Long id);
 9 
10 }

PaymentDao介面

1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE mapper
3         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
4         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
5 
6 <mapper namespace="com.atguigu.springcloud.dao.PaymentDao">
7 
8    
9 </mapper>

mapper的xml（初始）

 1             <!--這裡 Payment報錯 可以寫全路徑。 似乎是yml中的配置未生效  不確定是否還有其他問題-->
 2     <insert id="create" parameterType="com.atguigu.springcloud.entities.Payment" useGeneratedKeys="true" keyProperty="id">
 3         insert into payment(serial) values(#{serial});
 4     </insert>
 5 
 6     <!--定義一個結果接和實體類的對映表-->
 7     <resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
 8         <id column="id" property="id" jdbcType="BIGINT"/>
 9         <id column="serial" property="serial" jdbcType="VARCHAR"/>
10     </resultMap>
11 
12     <!-- 這裡是long Long會報錯  不知道是為何-->
13     <select id="getPaymentById" parameterType="long" resultMap="BaseResultMap">
14         select * from payment where id=#{id};
15     </select>

兩個方法對應的sql以及問題處理

這裡 Payment 和Long 報錯改一下就好，具體見程式碼。

　　【不過後期測試，即使Payment標紅，專案也可以啟動，也能正常使用該SQL給資料庫插入，暫且擱置】

import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;

public interface PaymentService {
    public int create( Payment payment);
    public Payment getPaymentById(@Param("id") Long id);
}




import com.atguigu.springcloud.dao.PaymentDao;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
public class PaymentServiceImpl implements PaymentService {

    @Resource
    private PaymentDao paymentDao;

    public int create( Payment payment){
        return paymentDao.create(payment);
    }
    public Payment getPaymentById(Long id){
        return paymentDao.getPaymentById(id);
    }


}

service層介面和實現類

實現類需要新增@Service註解

 1 package com.atguigu.springcloud.controller;
 2 
 3 import com.atguigu.springcloud.entities.CommonResult;
 4 import com.atguigu.springcloud.entities.Payment;
 5 import com.atguigu.springcloud.service.PaymentService;
 6 import lombok.extern.slf4j.Slf4j;
 7 import org.springframework.web.bind.annotation.*;
 8 
 9 import javax.annotation.Resource;
10 
11 @RestController
12 @Slf4j
13 public class PaymentController {
14     @Resource
15     private PaymentService paymentService;
16 
17     @PostMapping(value = "/payment/create")
18     public CommonResult create(Payment payment) {
19         int result = paymentService.create(payment);
20         log.info("*****插入結果：" + result);
21         if (result > 0) {
22             return new CommonResult(200, "插入資料庫成功", result);
23         }
24         return new CommonResult(444, "插入資料庫失敗", null);
25     }
26 
27     @GetMapping(value = "/payment/get/{id}")    //寫操作POST  讀get    還有pull等等
28     public CommonResult getPaymentById(@PathVariable("id") Long id) {
29 
30         Payment payment = paymentService.getPaymentById(id);
31         log.info("*****查詢結果：" + payment);
32         if (payment != null) {
33             return new CommonResult(200, "查詢資料庫成功", payment);
34         } else {
35             return new CommonResult(444, "查詢ID:" + id + "沒有對應記錄", null);
36         }
37     }
38 
39 }