微服务分布式事务实战（五）准备数据库和创建第一个微服务

1)数据库准备
在数据库中mysql 分别创建2个数据库forum1和forum2
forum1 下创建表block
forum2下创建表Theme
sql代码如下：
1 数据库1Forum1:
CREATE DATABASE IF NOT EXISTS forum1;
USE forum1;
DROP TABLE IF EXISTS block;
CREATE TABLE block (
id int(11) NOT NULL AUTO_INCREMENT,
bname varchar(45) DEFAULT NULL,
bDescription varchar(45) DEFAULT NULL COMMENT ‘板块描述\n’,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COMMENT=‘板块’;

LOCK TABLES block WRITE;
INSERT INTO block VALUES (1,‘java’,‘讨论java’),(2,‘C++’,‘讨论c++方面问题’);
UNLOCK TABLES;

2 数据库forum2
CREATE DATABASE IF NOT EXISTS forum2 ;
USE forum2;

DROP TABLE IF EXISTS theme;
CREATE TABLE theme (
id int(11) NOT NULL AUTO_INCREMENT,
tName varchar(50) DEFAULT NULL COMMENT ‘主题名’,
tDescription varchar(200) DEFAULT NULL COMMENT ‘主题描述’,
blockid int(11) DEFAULT NULL COMMENT ‘区id’,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COMMENT=‘主题’;

LOCK TABLES theme WRITE;
INSERT INTO theme VALUES (1,‘java基础’,‘java 基础’,1),(2,‘javaWeb’,‘java web’,1);
UNLOCK TABLES;
2）编写第一个微服务BlockMicroService
（1）创建工程
在这里插入图片描述
（2）添加 jar pom.xml
添加:springboot 父， mysql连接，(mybatis， spring-mybatis springboot ,阿里连接池) ,
服务中心客户端。

 <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>com.jh</groupId>
<artifactId>BlockMicroService</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>BlockMicroService</name>
<url>http://maven.apache.org</url>
<!-- 1 spring boot parent -->
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.3.RELEASE</version>
    <relativePath />
</parent>

<!--1 属性 -->
<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.7</java.version>
    <maven.compile.source>1.7</maven.compile.source>
    <maven.compile.target>1.7</maven.compile.target>
    <spring-cloud.version>Dalston.SR1</spring-cloud.version>
    <lcn.last.version>4.1.0</lcn.last.version>
</properties>

<dependencies>
    <!--2 mysql -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.43</version>
    </dependency>

    <!-- 3 包括mybatis,mybatis-spring,spring boot,spring 等 -->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.1.1</version>
    </dependency>

    <!--4  注册中心 -->

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>

    <!-- 5 连接池 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.19</version>
    </dependency>
    </dependencies>

<!-- spring cloud 依赖版本 -->
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Dalston.SR3</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
</project>

（3）编写配置文件Application.properties

配置发布服务名，端口；配置中心地址；连接mysql 参数
#1 register server
#服务名
spring.application.name =blockMicroService
#服务端口
server.port =8020
#注册中心地址
eureka.client.service-url.defaultZone=http://127.0.0.1:8001/eureka

spring.datasource.driver-class-name =com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/forum1?useUnicode=true&characterEncoding=utf8&autoReconnect=true&failOverReadOnly=false
spring.datasource.username= root
spring.datasource.password=
spring.datasource.initialize =true
init-db= true
logging.level.com.codingapi=debug
（4）编写实体，dao和映射。
实体：

public class Block {

private  int  id;
private  String bname;
private  String bDescription; 
get set …
}

Dao 和映射

package com.jh.dao;

@Mapper
public interface BlockDao {

/**
 * 查询
 * 
 * @return
 */
@Select(value = "select *  from block")
public List<Block> getBlockList();

/**
 * 插入
 * 
 * @param bname
 * @param bDescription
 * @return
 */

@Insert(value = "insert  into block(bname,bDescription)" + " values(#{bname},#{bDescription})")

public int saveBlock(@Param("bname") String bname, @Param("bDescription") String bDescription);
}

（5）编写服务层

服务接口

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public interface BlockService {

List<Block> getBlockList();

int saveBlock(String bname, String bDescription);
}

服务实现：

@Service
public class BlockServiceImpl implements BlockService {br/>@Autowired
private BlockDao blockDao;

@Override
public List<Block> getBlockList() {
return blockDao.getBlockList();br/>}
*/
@Override
public int saveBlock(String bName, String bDescription)
{
int rs1 = blockDao.saveBlock("jwg1", "111");// 保存1
return rs1;
}
}

（6）编写控制层

package com.jh.controller;br/>@RestController
public class BlockController {
/ private final Logger logger = Logger.getLogger(getClass()); /

 @Autowired
private BlockService blockService;// 区块服务，第一个服务

// 1接受请求
@RequestMapping(value = "/getBlockList", method = RequestMethod.GET)
public  List<Block> getBlockList() {
    List<Block>  blockList   = blockService.getBlockList();
    return   blockList;
}
// 
@RequestMapping(value = "/saveBlock", method = RequestMethod.GET)
public String  saveBlock() {
    //调用服务
    Integer  result=blockService.saveBlock("aa", "aa");
    return  ;
}
}

（7）编写主程序
开启springboot应用程序，注册中心客户端，mybatis扫描和定义一个数据源

package com.jh;

import javax.sql.DataSource;
@SpringBootApplication //spring boot应用程序
@EnableEurekaClient //服务中心客户端
@MapperScan("com.jh.dao")//mybatis 扫描
public class BlockMicroService {
public static void main(String[] args) {

    SpringApplication.run(BlockMicroService.class, args);
}

//1环境
@Autowired
private Environment env;

@Bean
public DataSource dataSource() {
    DruidDataSource dataSource = new DruidDataSource();

    dataSource.setUrl(env.getProperty("spring.datasource.url"));
    dataSource.setUsername(env.getProperty("spring.datasource.username"));//用户名
    dataSource.setPassword(env.getProperty("spring.datasource.password"));//密码
    dataSource.setInitialSize(10);
    dataSource.setMaxActive(50);
    dataSource.setMinIdle(1);
    dataSource.setMaxWait(60000);
    dataSource.setValidationQuery("SELECT 1");
    dataSource.setTestOnBorrow(false);
    dataSource.setTestWhileIdle(true);
    dataSource.setPoolPreparedStatements(false);

    return dataSource;
    }
}

（8）测试
启动注册中心，启动微服务
然后启动浏览器
在这里插入图片描述

微服务分布式事务实战（五）准备数据库和创建第一个微服务

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