一、 Sharding-jdbc簡(jiǎn)介
Sharding-jdbc是開(kāi)源的數(shù)據(jù)庫(kù)操作中間件；定位為輕量級(jí)Java框架，在Java的JDBC層提供的額外服務(wù)。它使用客戶端直連數(shù)據(jù)庫(kù)，以jar包形式提供服務(wù)，無(wú)需額外部署和依賴，可理解為增強(qiáng)版的JDBC驅(qū)動(dòng)，完全兼容JDBC和各種ORM框架。
官方文檔地址：https://shardingsphere.apache.org/document/current/cn/overview/
本文demo實(shí)現(xiàn)了分庫(kù)分表功能。如有錯(cuò)誤，歡迎各位在評(píng)論中指出。不勝感激！
二、項(xiàng)目結(jié)構(gòu)
首先創(chuàng)建一個(gè)一般的Spring boot項(xiàng)目，項(xiàng)目采用三層架構(gòu)，結(jié)構(gòu)圖如下：
POM.xml文件如下：
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<?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(shí)體類以書(shū)本為例
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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(shū)籍是實(shí)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(kāi)放保存和查詢兩個(gè)接口，代碼如下：
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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 */@RestControllerpublic 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
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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 */@Servicepublic 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
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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> {} |
創(chuàng)建數(shù)據(jù)庫(kù)表，DDL語(yǔ)句如下
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創(chuàng)建數(shù)據(jù)庫(kù)表數(shù)據(jù)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, `name` VARCHAR ( 255 ) DEFAULT NULL, `count` INT ( 11 ) DEFAULT 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, `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, `name` VARCHAR ( 255 ) DEFAULT NULL, `count` INT ( 11 ) DEFAULT 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, `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, `name` VARCHAR ( 255 ) DEFAULT NULL, `count` INT ( 11 ) DEFAULT NULL, PRIMARY KEY ( `id` )) ENGINE = INNODB DEFAULT CHARSET = utf8mb4; |
配置分庫(kù)分表策略application.properties：
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> 推薦一個(gè)艿艿寫的 3000+ Star 的 SpringCloud Alibaba 電商開(kāi)源項(xiàng)目的倉(cāng)庫(kù)：<https://github.com/YunaiV/onemall> # 數(shù)據(jù)源 db0,db1,db2sharding.jdbc.datasource.names=db0,db1,db2# 第一個(gè)數(shù)據(jù)庫(kù)sharding.jdbc.datasource.db0.type=com.zaxxer.hikari.HikariDataSourcesharding.jdbc.datasource.db0.driver-class-name=com.mysql.cj.jdbc.Driversharding.jdbc.datasource.db0.jdbc-url=jdbc:mysql://localhost:3306/db0?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTCsharding.jdbc.datasource.db0.username=rootsharding.jdbc.datasource.db0.password=Aa123456 # 第二個(gè)數(shù)據(jù)庫(kù)sharding.jdbc.datasource.db1.type=com.zaxxer.hikari.HikariDataSourcesharding.jdbc.datasource.db1.driver-class-name=com.mysql.cj.jdbc.Driversharding.jdbc.datasource.db1.jdbc-url=jdbc:mysql://localhost:3306/db1?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTCsharding.jdbc.datasource.db1.username=rootsharding.jdbc.datasource.db1.password=Aa123456 # 第三個(gè)數(shù)據(jù)庫(kù)sharding.jdbc.datasource.db2.type=com.zaxxer.hikari.HikariDataSourcesharding.jdbc.datasource.db2.driver-class-name=com.mysql.cj.jdbc.Driversharding.jdbc.datasource.db2.jdbc-url=jdbc:mysql://localhost:3306/db2?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTCsharding.jdbc.datasource.db2.username=rootsharding.jdbc.datasource.db2.password=Aa123456 # 水平拆分的數(shù)據(jù)庫(kù)（表） 配置分庫(kù) + 分表策略 行表達(dá)式分片策略# 分庫(kù)策略sharding.jdbc.config.sharding.default-database-strategy.inline.sharding-column=idsharding.jdbc.config.sharding.default-database-strategy.inline.algorithm-expression=db$->{id % 3} # 分表策略 其中book為邏輯表 分表主要取決于id行sharding.jdbc.config.sharding.tables.book.actual-data-nodes=db$->{0..2}.book_$->{0..2}sharding.jdbc.config.sharding.tables.book.table-strategy.inline.sharding-column=count# 分片算法表達(dá)式sharding.jdbc.config.sharding.tables.book.table-strategy.inline.algorithm-expression=book_$->{count % 3} # 主鍵 UUID 18位數(shù) 如果是分布式還要進(jìn)行一個(gè)設(shè)置 防止主鍵重復(fù)#sharding.jdbc.config.sharding.tables.user.key-generator-column-name=id # 打印執(zhí)行的數(shù)據(jù)庫(kù)以及語(yǔ)句sharding.jdbc.config.props..sql.show=truespring.main.allow-bean-definition-overriding=true #讀寫分離sharding.jdbc.datasource.dsmaster = |
接口測(cè)試使用postman
示例：
- GET請(qǐng)求------>http://localhost:8080/book
- POST請(qǐng)求：------->http://localhost:8080/book?id=1&name=java編程思想&count=8
demo的github地址：
https://github.com/Macky-He/spring-boot--shardingsphere-examples 如各位覺(jué)得有幫助的話，還請(qǐng)給個(gè)star鼓勵(lì)鼓勵(lì)博主，謝謝！
三、總結(jié)
分庫(kù)分表實(shí)現(xiàn)按照官方文檔做一個(gè)demo是第一步，如需深入還需要研究源碼，研究架構(gòu)，研究思想；此文僅作為入門demo搭建指南，如需深入理解，還請(qǐng)移步至官方文檔。
到此這篇關(guān)于Spring Boot 集成 Sharding-JDBC + Mybatis-Plus 實(shí)現(xiàn)分庫(kù)分表功能的文章就介紹到這了,更多相關(guān)Spring Boot實(shí)現(xiàn)分庫(kù)分表內(nèi)容請(qǐng)搜索服務(wù)器之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持服務(wù)器之家！
原文鏈接：https://blog.csdn.net/weixin_48673251/article/details/108250049
