Spring Boot 整合 Sharding-JDBC + Mybatis-Plus 實現分庫分表功能
阿新 • • 發佈:2020-08-27
一、 Sharding-jdbc簡介
“Sharding-jdbc是開源的資料庫操作中介軟體;定位為輕量級Java框架,在Java的JDBC層提供的額外服務。它使用客戶端直連資料庫,以jar包形式提供服務,無需額外部署和依賴,可理解為增強版的JDBC驅動,完全相容JDBC和各種ORM框架。
官方文件地址:https://shardingsphere.apache.org/document/current/cn/overview/
本文demo實現了分庫分表功能。如有錯誤,歡迎各位在評論中指出。不勝感激!
二、專案結構
首先建立一個一般的Spring boot專案,專案採用三層架構,結構圖如下:
POM.xml檔案如下:
<?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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.macky</groupId> <artifactId>spring-boot-shardingjdbc</artifactId> <version>0.0.1-SNAPSHOT</version> <name>spring-boot-shardingjdbc</name> <description>Demo project for spring-boot-shardingjdbc</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--mysql--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!--Mybatis-Plus--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.1</version> </dependency> <!--shardingsphere start--> <!-- for spring boot --> <dependency> <groupId>io.shardingsphere</groupId> <artifactId>sharding-jdbc-spring-boot-starter</artifactId> <version>3.1.0</version> </dependency> <!-- for spring namespace --> <dependency> <groupId>io.shardingsphere</groupId> <artifactId>sharding-jdbc-spring-namespace</artifactId> <version>3.1.0</version> </dependency> <!--shardingsphere end--> <!--lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
實體類以書本為例
package com.macky.springbootshardingjdbc.entity; import com.baomidou.mybatisplus.annotation.TableName; import com.baomidou.mybatisplus.extension.activerecord.Model; import groovy.transform.EqualsAndHashCode; import lombok.Data; import lombok.experimental.Accessors; /** * @author Macky * @Title class Book * @Description: 書籍是實體類 * @date 2019/7/13 15:23 */ @Data @EqualsAndHashCode(callSuper = true) @Accessors(chain = true) @TableName("book") public class Book extends Model<Book> { private int id; private String name; private int count; }
開放儲存和查詢兩個介面,程式碼如下:
package com.macky.springbootshardingjdbc.controller; import com.macky.springbootshardingjdbc.entity.Book; import com.macky.springbootshardingjdbc.service.BookService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.List; /** * @author Macky * @Title class BookController * @Description: TODO * @date 2019/7/12 20:53 */ @RestController public class BookController { @Autowired BookService bookService; @RequestMapping(value = "/book",method = RequestMethod.GET) public List<Book> getItems(){ return bookService.getBookList(); } @RequestMapping(value = "/book",method = RequestMethod.POST) public Boolean saveItem(Book book){ return bookService.save(book); } }
BookServiceImpl.java
package com.macky.springbootshardingjdbc.service.impl; import com.baomidou.mybatisplus.core.toolkit.Wrappers; import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl; import com.macky.springbootshardingjdbc.entity.Book; import com.macky.springbootshardingjdbc.mapper.BookMapper; import com.macky.springbootshardingjdbc.service.BookService; import org.springframework.stereotype.Service; import java.util.List; /** * @author Macky * @Title class BookServiceImpl * @Description: TODO * @date 2019/7/12 20:47 */ @Service public class BookServiceImpl extends ServiceImpl<BookMapper,Book> implements BookService { @Override public List<Book> getBookList() { return baseMapper.selectList(Wrappers.<Book>lambdaQuery()); } @Override public boolean save(Book book) { return super.save(book); } }
BookMapper.java
package com.macky.springbootshardingjdbc.mapper; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.macky.springbootshardingjdbc.entity.Book; /** * @author Macky * @Title class BookMapper * @Description: TODO * @date 2019/7/12 20:46 */ public interface BookMapper extends BaseMapper<Book> { }
建立資料庫表,DDL語句如下
建立資料庫表資料 CREATE DATABASE IF NOT EXISTS `db0`; USE `db0`; DROP TABLE IF EXISTS `book_0`; CREATE TABLE `book_0` ( `id` INT ( 11 ) NOT NULL,`name` VARCHAR ( 255 ) DEFAULT NULL,`count` INT ( 11 ) DEFAULT NULL,PRIMARY KEY ( `id` ) ) ENGINE = INNODB DEFAULT CHARSET = utf8mb4; DROP TABLE IF EXISTS `book_1`; CREATE TABLE `book_1` ( `id` INT ( 11 ) NOT NULL,PRIMARY KEY ( `id` ) ) ENGINE = INNODB DEFAULT CHARSET = utf8mb4; CREATE DATABASE IF NOT EXISTS `db1`; USE `db1`; DROP TABLE IF EXISTS `book_0`; CREATE TABLE `book_0` ( `id` INT ( 11 ) NOT NULL,PRIMARY KEY ( `id` ) ) ENGINE = INNODB DEFAULT CHARSET = utf8mb4; CREATE DATABASE IF NOT EXISTS `db2`; USE `db2`; DROP TABLE IF EXISTS `book_0`; CREATE TABLE `book_0` ( `id` INT ( 11 ) NOT NULL,PRIMARY KEY ( `id` ) ) ENGINE = INNODB DEFAULT CHARSET = utf8mb4;
配置分庫分表策略application.properties:
> 推薦一個艿艿寫的 3000+ Star 的 SpringCloud Alibaba 電商開源專案的倉庫:<https://github.com/YunaiV/onemall> # 資料來源 db0,db1,db2 sharding.jdbc.datasource.names=db0,db2 # 第一個資料庫 sharding.jdbc.datasource.db0.type=com.zaxxer.hikari.HikariDataSource sharding.jdbc.datasource.db0.driver-class-name=com.mysql.cj.jdbc.Driver sharding.jdbc.datasource.db0.jdbc-url=jdbc:mysql://localhost:3306/db0?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC sharding.jdbc.datasource.db0.username=root sharding.jdbc.datasource.db0.password=Aa123456 # 第二個資料庫 sharding.jdbc.datasource.db1.type=com.zaxxer.hikari.HikariDataSource sharding.jdbc.datasource.db1.driver-class-name=com.mysql.cj.jdbc.Driver sharding.jdbc.datasource.db1.jdbc-url=jdbc:mysql://localhost:3306/db1?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC sharding.jdbc.datasource.db1.username=root sharding.jdbc.datasource.db1.password=Aa123456 # 第三個資料庫 sharding.jdbc.datasource.db2.type=com.zaxxer.hikari.HikariDataSource sharding.jdbc.datasource.db2.driver-class-name=com.mysql.cj.jdbc.Driver sharding.jdbc.datasource.db2.jdbc-url=jdbc:mysql://localhost:3306/db2?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC sharding.jdbc.datasource.db2.username=root sharding.jdbc.datasource.db2.password=Aa123456 # 水平拆分的資料庫(表) 配置分庫 + 分表策略 行表示式分片策略 # 分庫策略 sharding.jdbc.config.sharding.default-database-strategy.inline.sharding-column=id sharding.jdbc.config.sharding.default-database-strategy.inline.algorithm-expression=db$->{id % 3} # 分表策略 其中book為邏輯表 分表主要取決於id行 sharding.jdbc.config.sharding.tables.book.actual-data-nodes=db$->{0..2}.book_$->{0..2} sharding.jdbc.config.sharding.tables.book.table-strategy.inline.sharding-column=count # 分片演算法表示式 sharding.jdbc.config.sharding.tables.book.table-strategy.inline.algorithm-expression=book_$->{count % 3} # 主鍵 UUID 18位數 如果是分散式還要進行一個設定 防止主鍵重複 #sharding.jdbc.config.sharding.tables.user.key-generator-column-name=id # 列印執行的資料庫以及語句 sharding.jdbc.config.props..sql.show=true spring.main.allow-bean-definition-overriding=true #讀寫分離 sharding.jdbc.datasource.dsmaster =
介面測試使用postman
示例:
- GET請求------>http://localhost:8080/book
- POST請求:------->http://localhost:8080/book?id=1&name=java程式設計思想&count=8
demo的github地址:
https://github.com/Macky-He/spring-boot--shardingsphere-examples 如各位覺得有幫助的話,還請給個star鼓勵鼓勵博主,謝謝!
三、總結
分庫分表實現按照官方文件做一個demo是第一步,如需深入還需要研究原始碼,研究架構,研究思想;此文僅作為入門demo搭建指南,如需深入理解,還請移步至官方文件。
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