MyBatis-Plus之實現多數據源

多數據源的目的在於一個代碼模塊可調用多個數據庫的數據進行某些業務操做。mysql

MyBatis-Plus開發者寫了一個多數據源叫dynamic-datasource-spring-boot-starter,很是簡單易用。git

dynamic-datasource-spring-boot-starter文檔github

官方文檔部分截圖:
image.png
第三方集成的,基本上是目前比較主流的(用的比較多)。spring

1、添加Maven依賴

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
    <version>2.5.4</version>
</dependency>

2、配置文件修改(application.yml)

spring:
  datasource:
    dynamic:
      primary: db1 #設置默認的數據源,默認值爲master
      datasource:
        db1:  #數據源db1
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://127.0.0.1:3306/wordpress_master?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
          username: root
          password: 123456
        db2: #數據源db2
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://127.0.0.1:3306/wordpress_slave?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
          username: root
          password: 123456
      type: com.alibaba.druid.pool.DruidDataSource
      druid:
        initial-size: 10
        max-active: 100
        min-idle: 10
        max-wait: 60000
        pool-prepared-statements: true
        max-pool-prepared-statement-per-connection-size: 20
        time-between-eviction-runs-millis: 60000
        min-evictable-idle-time-millis: 300000
        #Oracle須要打開註釋
        #validation-query: SELECT 1 FROM DUAL
        test-while-idle: true
        test-on-borrow: false
        test-on-return: false
        stat-view-servlet:
          enabled: true
          url-pattern: /druid/*
          #login-username: admin
          #login-password: admin
        filter:
          stat:
            log-slow-sql: true
            slow-sql-millis: 1000
            merge-sql: false
          wall:
            config:
              multi-statement-allow: true

3、完成成一、2步後,啓動應用

若是控制檯不報錯且出現以下圖所示,就表示成功整合:
image.pngsql

4、注意事項

啓動主類須要排除Druid相關依賴,不然會出現以下錯誤:數據庫

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class

解決辦法,加上以下代碼便可:app

@SpringBootApplication(exclude = DruidDataSourceAutoConfigure.class)

本文部份內容來源個人博客。ide

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