目录

一、问题说明

 二、读写分离示例

三、Mysql主从复制

3.1 介绍

3.2 配置

3.2.1 前置条件

 3.2.2 配置-主库Master

3.2.2.1 第一步

3.2.2.2 第二步 

 3.2.2.3 第三步

3.2.2.4 第四步

3.2.3 配置-从库Slave

3.2.3.1 第一步

3.2.3.2 第二步

3.2.3.3 第三步

3.2.3.4 第四步

3.3 测试

四、读写分离案例

4.1 背景

4.2 Sharding-JDBC介绍

4.3 入门案例

4.4 功能测试

五、项目实现读写分离

5.1 数据库环境准备（主从复制）

5.2 代码改造

5.2.1 maven坐标

 5.2.2 配置读写分离规则与允许定义bean覆盖

5.3 功能测试

---

前言：实现数据读写分离

一、问题说明

 二、读写分离示例

三、Mysql主从复制

3.1 介绍

3.2 配置

3.2.1 前置条件

 3.2.2 配置-主库Master

3.2.2.1 第一步

3.2.2.2 第二步 

systemctl restart mysqld

 3.2.2.3 第三步

  

GRANT REPLICATION SLAVE ON *.* to 'xiaoming'@'%' identified by 'Root@123456';

3.2.2.4 第四步

show master status;

  

3.2.3 配置-从库Slave

3.2.3.1 第一步

3.2.3.2 第二步

systemctl restart mysqld

3.2.3.3 第三步

# 根据master第四步查询结果更改

change master to master_host='192.168.138.100',master_user='xiaoming',master_password='Root@123456',master_log_file='mysql-bin.000001',master_log_pos=441;

如有错误按图操作

start slave;

3.2.3.4 第四步

 

show slave status;

 复制到文本编译器查看

3.3 测试

使用数据库连接工具测试，主库进行操作，查看从库

四、读写分离案例

4.1 背景

4.2 Sharding-JDBC介绍

4.3 入门案例

server:
  port: 8080
mybatis-plus:
  configuration:
    #在映射实体或者属性时，将数据库中表名和字段名中的下划线去掉，按照驼峰命名法映射
    map-underscore-to-camel-case: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  global-config:
    db-config:
      id-type: ASSIGN_ID
spring:
  shardingsphere:
    datasource:
      names:
        master,slave
      # 主数据源
      master:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://192.168.138.100:3306/rw?characterEncoding=utf-8
        username: root
        password: root
      # 从数据源
      slave:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://192.168.138.101:3306/rw?characterEncoding=utf-8
        username: root
        password: root
    masterslave:
      # 读写分离配置
      load-balance-algorithm-type: round_robin #轮询
      # 最终的数据源名称
      name: dataSource
      # 主库数据源名称
      master-data-source-name: master
      # 从库数据源名称列表，多个逗号分隔
      slave-data-source-names: slave
    props:
      sql:
        show: true #开启SQL显示，默认false
  main:
    allow-bean-definition-overriding: true  # 不配置会出现下图报错

  报错：

4.4 功能测试

略

五、项目实现读写分离

5.1 数据库环境准备（主从复制）

5.2 代码改造

5.2.1 maven坐标

<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.runa</groupId>
  <artifactId>reggie_take_out_spuer</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.4.5</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <name>reggie_take_out_spuer</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <!--阿里云短信服务-->
    <dependency>
      <groupId>com.aliyun</groupId>
      <artifactId>aliyun-java-sdk-core</artifactId>
      <version>4.5.16</version>
    </dependency>
    <dependency>
      <groupId>com.aliyun</groupId>
      <artifactId>aliyun-java-sdk-dysmsapi</artifactId>
      <version>2.1.0</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
    </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>
      <scope>compile</scope>
    </dependency>

    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.4.2</version>
    </dependency>

    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.20</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.76</version>
    </dependency>

    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.6</version>
    </dependency>

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

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid-spring-boot-starter</artifactId>
      <version>1.1.23</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!--redis-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>

    <!--  spring Cache         -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>

    <!--  Shardingsphere  Cache         -->
    <dependency>
      <groupId>org.apache.shardingsphere</groupId>
      <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
      <version>4.0.0-RC1</version>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>2.4.5</version>
      </plugin>
    </plugins>
  </build>
</project>

 5.2.2 配置读写分离规则与允许定义bean覆盖

server:
  port: 8080
spring:
  application:
    # 应用名称 可选
    name: reggie_take_out_spuer
  shardingsphere:
    datasource:
      names:
        master,slave
      # 主数据源
      master:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://192.168.138.100:3306/reggie?characterEncoding=utf-8
        username: root
        password: root
      # 从数据源
      slave:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://192.168.138.101:3306/reggie?characterEncoding=utf-8
        username: root
        password: root
    masterslave:
      # 读写分离配置
      load-balance-algorithm-type: round_robin #轮询
      # 最终的数据源名称
      name: dataSource
      # 主库数据源名称
      master-data-source-name: master
      # 从库数据源名称列表，多个逗号分隔
      slave-data-source-names: slave
    props:
      sql:
        show: true #开启SQL显示，默认false
  main:
    allow-bean-definition-overriding: true
  redis:
    host: 127.0.0.1
    port: 6379
    password: 123456
    database: 0
  cache:
    redis:
      time-to-live: 1800000  # 设置缓存数据的过期时间
mybatis-plus:
  configuration:
    #在映射实体或者属性时，将数据库中表名和字段名中的下划线去掉，按照驼峰命名法映射
    map-underscore-to-camel-case: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  global-config:
    db-config:
      id-type: ASSIGN_ID
# 文件上传目录
reggie:
  path: D:\images\

5.3 功能测试

略