SELECT * FROM user WHERE tenant_id = 1;

<?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>2.1.7.RELEASE</version>
        <relativePath/>
    </parent>
    <groupId>com.xd</groupId>
    <artifactId>mybatis-plus-multi-tenancy</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis-plus-multi-tenancy</name>
    <description>基于Spring Boot Mybatis-Plus的多租戶架構(gòu)</description>


    <properties>
        <java.version>1.8</java.version>
        <mybatis-plus.version>3.1.2</mybatis-plus.version>
    </properties>


    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--Mybatis-Plus依賴-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>
        <!--測試相關(guān)依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.0.M1</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
        </dependency>
    </dependencies>


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


</project>

# 數(shù)據(jù)源配置
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.hikari.minimum-idle=3
spring.datasource.hikari.maximum-pool-size=10
# 不能小于30秒，否則默認回到1800秒
spring.datasource.hikari.max-lifetime=30000
spring.datasource.hikari.connection-test-query=SELECT 1
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/multi?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root

logging.level.com.xd.mybatisplusmultitenancy=debug

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主鍵',
  `name` varchar(30) DEFAULT NULL COMMENT '姓名',
  `tenant_id` int(11) NOT NULL COMMENT '多租戶ID',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

SET FOREIGN_KEY_CHECKS = 1;

package com.xd.mybatisplusmultitenancy.config;

import com.baomidou.mybatisplus.extension.plugins.tenant.TenantHandler;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.LongValue;
import net.sf.jsqlparser.expression.NullValue;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

/**
 * @Classname PreTenantHandler
 * @Description 租戶處理器 -主要實現(xiàn)mybatis-plus https://mp.baomidou.com/guide/tenant.html
 * @Author Created by Lihaodong (alias:小東啊) lihaodongmail@163.com
 * @Date 2019-08-09 23:34
 * @Version 1.0
 */
@Slf4j
@Component
public class MyTenantHandler implements TenantHandler {

    /**
     * 多租戶標識
     */
    private static final String SYSTEM_TENANT_ID = "tenant_id";

    /**
     * 需要過濾的表
     */
    private static final List<String> IGNORE_TENANT_TABLES = new ArrayList<>();

    @Autowired
    private MyContext apiContext;


    /**
     * 租戶Id
     *
     * @return
     */
    @Override
    public Expression getTenantId() {
        // 從當前系統(tǒng)上下文中取出當前請求的服務(wù)商ID，通過解析器注入到SQL中。
        Long tenantId = apiContext.getCurrentTenantId();
        log.debug("當前租戶為{}", tenantId);
        if (tenantId == null) {
            return new NullValue();
        }
        return new LongValue(tenantId);
    }

    /**
     * 租戶字段名
     *
     * @return
     */
    @Override
    public String getTenantIdColumn() {
        return SYSTEM_TENANT_ID;
    }

    /**
     * 根據(jù)表名判斷是否進行過濾
     * 忽略掉一些表：如租戶表（sys_tenant）本身不需要執(zhí)行這樣的處理
     *
     * @param tableName
     * @return
     */
    @Override
    public boolean doTableFilter(String tableName) {
        return IGNORE_TENANT_TABLES.stream().anyMatch((e) -> e.equalsIgnoreCase(tableName));
    }
}

package com.xd.mybatisplusmultitenancy.config;

import com.baomidou.mybatisplus.core.parser.ISqlParser;
import com.baomidou.mybatisplus.extension.parsers.BlockAttackSqlParser;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PerformanceInterceptor;
import com.baomidou.mybatisplus.extension.plugins.tenant.TenantHandler;
import com.baomidou.mybatisplus.extension.plugins.tenant.TenantSqlParser;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.LongValue;

import java.util.ArrayList;
import java.util.List;

/**
 * @Classname MybatisPlusConfig
 * @Description TODO
 * @Author Created by Lihaodong (alias:小東啊) lihaodongmail@163.com
 * @Date 2019-08-09 22:44
 * @Version 1.0
 */
@Configuration
@MapperScan("com.xd.mybatisplusmultitenancy.mapper")
public class MybatisPlusConfig {


    @Autowired
    private MyTenantHandler myTenantHandler;

    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();

        // SQL解析處理攔截：增加租戶處理回調(diào)。

        List<ISqlParser> sqlParserList = new ArrayList<>();
        // 攻擊 SQL 阻斷解析器、加入解析鏈
        sqlParserList.add(new BlockAttackSqlParser());
        // 多租戶攔截
        TenantSqlParser tenantSqlParser = new TenantSqlParser();
        tenantSqlParser.setTenantHandler(myTenantHandler);
        sqlParserList.add(tenantSqlParser);
        paginationInterceptor.setSqlParserList(sqlParserList);
        return paginationInterceptor;
    }

    /**
     * 性能分析攔截器，不建議生產(chǎn)使用
     * 用來觀察 SQL 執(zhí)行情況及執(zhí)行時長
     */
    @Bean(name = "performanceInterceptor")
    public PerformanceInterceptor performanceInterceptor() {
        return new PerformanceInterceptor();
    }
}

package com.xd.mybatisplusmultitenancy.config;


import org.springframework.stereotype.Component;


import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


/**
 * @Classname ApiContext
 * @Description 當前系統(tǒng)的上下文
 * @Author Created by Lihaodong (alias:小東啊) lihaodongmail@163.com
 * @Date 2019-08-09 22:47
 * @Version 1.0
 */
@Component
public class MyContext {


    private static final String KEY_CURRENT_TENANT_ID = "KEY_CURRENT_PROVIDER_ID";
    private static final Map<String, Object> M_CONTEXT = new ConcurrentHashMap<>();


    public void setCurrentTenantId(Long tenantId) {
        M_CONTEXT.put(KEY_CURRENT_TENANT_ID, tenantId);
    }


    public Long getCurrentTenantId() {
        return (Long) M_CONTEXT.get(KEY_CURRENT_TENANT_ID);
    }
}

package com.xd.mybatisplusmultitenancy.test;


import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.xd.mybatisplusmultitenancy.MybatisPlusMultiTenancyApplication;
import com.xd.mybatisplusmultitenancy.config.MyContext;
import com.xd.mybatisplusmultitenancy.entity.User;
import com.xd.mybatisplusmultitenancy.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.junit.Assert;
import org.junit.Before;
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.MethodSorters;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


import java.sql.Wrapper;


/**
 * @Classname MybatisPlusMultiTenancyApplicationTests
 * @Description TODO
 * @Author Created by Lihaodong (alias:小東啊) lihaodongmail@163.com
 * @Date 2019-08-09 22:50
 * @Version 1.0
 */
@Slf4j
@RunWith(SpringRunner.class)
@FixMethodOrder(MethodSorters.JVM)
@SpringBootTest(classes = MybatisPlusMultiTenancyApplication.class)
public class MybatisPlusMultiTenancyApplicationTests {




    @Autowired
    private MyContext apiContext;


    @Autowired
    private UserMapper userMapper;


    /**
     * 模擬當前系統(tǒng)的多租戶Id
     */
    @Before
    public void before() {
        // 在上下文中設(shè)置當前多租戶id
        apiContext.setCurrentTenantId(1L);
    }


    @Test
    public void insert() {
        // 新增數(shù)據(jù)
        User user = new User().setName("小明");
        //判斷一個條件是true還是false
        Assert.assertTrue(userMapper.insert(user) > 0);
        user = userMapper.selectById(user.getId());
        log.info("插入數(shù)據(jù):{}", user);
        // 判斷是否相等
        Assert.assertEquals(apiContext.getCurrentTenantId(), user.getTenantId());
    }


    @Test
    public void selectList() {
        userMapper.selectList(null).forEach((e) -> {
            log.info("查詢數(shù)據(jù){}", e);
            Assert.assertEquals(apiContext.getCurrentTenantId(), e.getTenantId());
        });
    }
}