乾貨 | Servicecomb使用Mybatis入門案例

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作者 | 付高揚

本篇文章主要講述如何快速搭建ServiceComb工程，並且結合MyBatis框架實現操作數據庫。

完整Demo參考：https://github.com/servicestage-demo/cse-java-demo-list/tree/master/demo-cse-mybatis

創建工程

首先在本地搭建ServiceComb工程

爲了能夠使開發者可以快速構建ServiceComb應用程序，官方爲我們提供了一套腳手架，這樣能夠方便學習者及應用開發者快速入門，同時極大的提高了效率。

快速開發引導頁：http://start.servicecomb.io/

填寫好工程group、artifact等信息（ServiceComb參數可以使用默認），就可以生成一個ServiceComb工程了，將工程下載到本地，導入到Eclipse或者IDEA等開發工具中。

配置microservice.yaml

servicecomb.service.registry.address：CSE（微服務引擎）服務註冊發現地址
servicecomb.rest.address：本地應用訪問地址
AK、SK獲取請參考鏈接：https://support.huaweicloud.com/devg-apisign/api-sign-provide.html#p3

APPLICATION_ID: demo-face-recognition
service_description:
# name of the declaring microservice
  name: demo-face-recognition
  version: 0.0.1
  environment: development
servicecomb:
  service:
    registry:
      address: https://cse.xxx.myhuaweicloud.com:port
  rest:
    address: 0.0.0.0:8081
  credentials:
    accessKey: Your AK
    secretKey: Your SK
    project: cn-north-1
    akskCustomerCipher: default
  handler:
    chain:
      Provider:
        default: tracing-provider

也可以使用本地註冊中心，到官網http://servicecomb.apache.org/cn/release/下載ServiceComb Service-Center（選最新版本）

本地microservice.yaml配置參考：

APPLICATION_ID: demo-face-recognition
service_description:
  name: demo-face-recognition
  version: 1.0.0
service_description:
  name: demo-provider
  version: 1.0.0
servicecomb:
  rest:
    address: 0.0.0.0:9000
  service:
    registry:
      address: http://127.0.0.1:30100

配置jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/test
username=root
password=root

配置mybatis

mybatis-config.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>
  <!-- 引用db.properties配置文件 -->
  <properties resource="jdbc.properties" />


  <typeAliases>
    <typeAlias
      type="org.apache.servicecomb.samples.mybatis.util.DruidDataSourceFactory"
      alias="DRUID" />
  </typeAliases>


  <!-- development : 開發模式 work : 工作模式 -->
  <environments default="work">
    <environment id="work">
      <transactionManager type="JDBC" />
      <!-- 配置數據庫連接信息 -->
      <dataSource type="DRUID">
        <!-- value屬性值引用db.properties配置文件中配置的值 -->
        <property name="driver" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
      </dataSource>
    </environment>
  </environments>


  <!-- mybatis的mapper文件，每個xml配置文件對應一個接口 -->
  <mappers>
    <mapper resource="mapper/userMapper.xml" />
  </mappers>
</configuration>

配置mapper文件（接口可以自行定義）

userMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"      
 "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<mapper
  namespace="org.apache.servicecomb.samples.mybatis.dao.userDao">
  <select id="findAllUsers"
    resultType="org.apache.servicecomb.samples.mybatis.entity.User">
    select * from user;
  </select>


  <insert id="addUser"
    parameterType="org.apache.servicecomb.samples.mybatis.entity.User">
    insert into user(sid, name, gender, department)
    values(null, #{name}, #{gender}, #{department})
  </insert>
</mapper>

目錄結構說明

目錄說明:

+---lib
\---src
    \---org
        \---apache
            \---servicecomb
                \---samples
                    \---mybatis
    \---resources
      \---mapper
+   pom.xml
+   ReadMe.md
+   VERSION

調用示例

調用URL：http://127.0.0.1:8081/user
請求方式：GET
Response示例：
[{
  "sid": 1,
   "name": "小明",
   "gender": "男",
   "department": "華爲雲服務"
}]

pom.xml參考

<?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>
  <groupId>org.apache.servicecomb.samples</groupId>
  <artifactId>demo-mybatis</artifactId>
  <name>Java Chassis::Samples::Demo-Mybatis</name>
  <version>1.2.0</version>
  <packaging>jar</packaging>


  <description>Quick Start Demo for Using ServiceComb Java Chassis</description>


  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <java-chassis.version>${project.version}</java-chassis.version>
    <spring-boot-1.version>1.5.14.RELEASE</spring-boot-1.version>
  </properties>


  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.apache.servicecomb</groupId>
        <artifactId>java-chassis-dependencies</artifactId>
        <version>${java-chassis.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>${spring-boot-1.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>


  <dependencies>
    <dependency>
      <groupId>org.hibernate.validator</groupId>
      <artifactId>hibernate-validator</artifactId>
    </dependency>
    <dependency>
      <groupId>javax.validation</groupId>
      <artifactId>validation-api</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
    </dependency>


    <dependency>
      <groupId>org.apache.servicecomb</groupId>
      <artifactId>spring-boot-starter-provider</artifactId>
    </dependency>


    <dependency>
      <groupId>org.apache.servicecomb</groupId>
      <artifactId>handler-flowcontrol-qps</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.servicecomb</groupId>
      <artifactId>handler-bizkeeper</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.servicecomb</groupId>
      <artifactId>handler-tracing-zipkin</artifactId>
    </dependency>
    <dependency>
      <groupId>com.huawei.paas.cse</groupId>
      <artifactId>cse-solution-service-engine</artifactId>
      <version>2.3.56</version>
    </dependency>
    <dependency>
      <groupId>org.apache.servicecomb</groupId>
      <artifactId>tracing-zipkin</artifactId>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.1</version>
    </dependency>


    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>


    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.14</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
          <execution>
            <id>copy-dependencies</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
            <configuration>
              <outputDirectory>
                ${project.build.directory}/dtm-lib
              </outputDirectory>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <outputDirectory>${project.build.directory}</outputDirectory>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
              <classpathPrefix>./dtm-lib/</classpathPrefix>
              <mainClass>org.apache.servicecomb.samples.gc.GCApplication</mainClass>
              <useUniqueVersions>false</useUniqueVersions>
            </manifest>
            <manifestEntries>
              <Class-Path>.</Class-Path>
            </manifestEntries>
          </archive>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <compilerArgument>-parameters</compilerArgument>
          <encoding>UTF-8</encoding>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
          <fork>true</fork>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

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