Spring Boot + Mybatis 實現動態數據源

動態數據源

在不少具體應用場景的時候,咱們須要用到動態數據源的狀況,好比多租戶的場景,系統登陸時須要根據用戶信息切換到用戶對應的數據庫。又好比業務A要訪問A數據庫,業務B要訪問B數據庫等,均可以使用動態數據源方案進行解決。接下來,咱們就來說解如何實現動態數據源,以及在過程當中剖析動態數據源背後的實現原理。html

實現案例

本教程案例基於 Spring Boot + Mybatis + MySQL 實現。java

數據庫設計

首先須要安裝好MySQL數據庫,新建數據庫 master,slave,分別建立用戶表,用來測試數據源,SQL腳本以下。mysql

-- ----------------------------------------------------
--  用戶
-- ----------------------------------------------------
--  Table structure for `sys_user`
-- ----------------------------------------------------
DROP TABLE IF EXISTS `sys_user`;
CREATE TABLE `sys_user` (
  `id` bigint NOT NULL AUTO_INCREMENT COMMENT '編號',
  `name` varchar(50) NOT NULL COMMENT '用戶名',
  `password` varchar(100) COMMENT '密碼',
  `salt` varchar(40) COMMENT '鹽',
  `email` varchar(100) COMMENT '郵箱',
  `mobile` varchar(100) COMMENT '手機號',
  `status` tinyint COMMENT '狀態  0:禁用   1:正常',
  `dept_id` bigint(20) COMMENT '機構ID',
  `create_by` varchar(50) COMMENT '建立人',
  `create_time` datetime COMMENT '建立時間',
  `last_update_by` varchar(50) COMMENT '更新人',
  `last_update_time` datetime COMMENT '更新時間',
  `del_flag` tinyint DEFAULT 0 COMMENT '是否刪除  -1:已刪除  0:正常',
  PRIMARY KEY (`id`),
  UNIQUE INDEX (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用戶';

新建工程

新建一個Spring Boot工程,最終代碼結構以下。git

 

添加依賴

添加Spring Boot,Spring Aop,Mybatis,MySQL,Swagger相關依賴。Swagger方便用來測試接口。web

pom.xmlspring

<?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>

    <groupId>top.ivan.demo</groupId>
    <artifactId>springboot-dynamic-datasource</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot-dynamic-datasource</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <mybatis.spring.version>1.3.2</mybatis.spring.version>
        <swagger.version>2.8.0</swagger.version>
    </properties>

    <dependencies>
           <!-- spring boot -->
        <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>
        <!-- spring aop -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.spring.version}</version>
        </dependency>
        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- swagger -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${swagger.version}</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${swagger.version}</version>
        </dependency>
    </dependencies>

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

</project>

配置文件

修改配置文件,添加兩個數據源,能夠是同一個主機地址的兩個數據庫master,slave,也但是兩個不一樣主機的地址,根據實際狀況配置。sql

application.yml數據庫

spring:
  datasource:
    master:
      driver-class-name: com.mysql.jdbc.Driver
      type: com.zaxxer.hikari.HikariDataSource
      jdbcUrl: jdbc:mysql://127.0.0.1:3306/master?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
      username: root
      password: 123
    slave:
      driver-class-name: com.mysql.jdbc.Driver
      type: com.zaxxer.hikari.HikariDataSource
      jdbcUrl: jdbc:mysql://127.0.0.1:3306/slave?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
      username: root
      password: 123

啓動類

啓動類添加 exclude = {DataSourceAutoConfiguration.class}, 以禁用數據源默認自動配置。apache

數據源默認自動配置會讀取 spring.datasource.* 的屬性建立數據源,因此要禁用以進行定製。springboot

@ComponentScan(basePackages = "com.louis.springboot") 是掃描範圍,都知道不用多說。

DynamicDatasourceApplication.java

package com.louis.springboot.dynamic.datasource;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;

/**
 * 啓動器
 * @author Louis
 * @date Oct 31, 2018
 */
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})    // 禁用數據源自動配置
@ComponentScan(basePackages = "com.louis.springboot")
public class DynamicDatasourceApplication {

    public static void main(String[] args) {
        SpringApplication.run(DynamicDatasourceApplication.class, args);
    }
}

數據源配置類

建立一個數據源配置類,主要作如下幾件事情:

1. 配置 dao,model,xml mapper文件的掃描路徑。

2. 注入數據源配置屬性,建立master、slave數據源。

3. 建立一個動態數據源,並裝入master、slave數據源。

4. 將動態數據源設置到SQL會話工廠和事務管理器。

如此,當進行數據庫操做時,就會經過咱們建立的動態數據源去獲取要操做的數據源了。

package com.louis.springboot.dynamic.datasource.config;

import java.util.HashMap;
import java.util.Map;

import javax.sql.DataSource;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import com.louis.springboot.dynamic.datasource.dds.DynamicDataSource;

/**
 * Mybatis配置
 * @author Louis
 * @date Oct 31, 2018
 */
@Configuration
@MapperScan(basePackages = {"com.louis.**.dao"}) // 掃描DAO
public class MybatisConfig {

    @Bean("master")
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource.master")
    public DataSource master() {
        return DataSourceBuilder.create().build();
    }

    @Bean("slave")
    @ConfigurationProperties(prefix = "spring.datasource.slave")
    public DataSource slave() {
        return DataSourceBuilder.create().build();
    }

    @Bean("dynamicDataSource")
    public DataSource dynamicDataSource() {
        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        Map<Object, Object> dataSourceMap = new HashMap<>(2);
        dataSourceMap.put("master", master());
        dataSourceMap.put("slave", slave());
        // 將 master 數據源做爲默認指定的數據源
        dynamicDataSource.setDefaultDataSource(master());
        // 將 master 和 slave 數據源做爲指定的數據源
        dynamicDataSource.setDataSources(dataSourceMap);
        return dynamicDataSource;
    }

    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean() throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        // 配置數據源,此處配置爲關鍵配置,若是沒有將 dynamicDataSource做爲數據源則不能實現切換
        sessionFactory.setDataSource(dynamicDataSource());
        sessionFactory.setTypeAliasesPackage("com.louis.**.model");    // 掃描Model
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sessionFactory.setMapperLocations(resolver.getResources("classpath*:**/sqlmap/*.xml"));    // 掃描映射文件
        return sessionFactory;
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        // 配置事務管理, 使用事務時在方法頭部添加@Transactional註解便可
        return new DataSourceTransactionManager(dynamicDataSource());
    }
}

動態數據源類

咱們上一步把這個動態數據源設置到了SQL會話工廠和事務管理器,這樣在操做數據庫時就會經過動態數據源類來獲取要操做的數據源了。

動態數據源類集成了Spring提供的AbstractRoutingDataSource類,AbstractRoutingDataSource 中獲取數據源的方法就是 determineTargetDataSource,而此方法又經過 determineCurrentLookupKey 方法獲取查詢數據源的key。

因此若是咱們須要動態切換數據源,就能夠經過如下兩種方式定製:

1. 覆寫 determineCurrentLookupKey 方法

經過覆寫 determineCurrentLookupKey 方法,從一個自定義的 DynamicDataSourceContextHolder.getDataSourceKey() 獲取數據源key值,這樣在咱們想動態切換數據源的時候,只要經過  DynamicDataSourceContextHolder.setDataSourceKey(key)  的方式就能夠動態改變數據源了。這種方式要求在獲取數據源以前,要先初始化各個數據源到 DynamicDataSource 中,咱們案例就是採用這種方式實現的,因此在 MybatisConfig 中把master和slave數據源都事先初始化到DynamicDataSource 中。

2. 能夠經過覆寫 determineTargetDataSource,由於數據源就是在這個方法建立並返回的,因此這種方式就比較自由了,支持到任何你但願的地方讀取數據源信息,只要最終返回一個 DataSource 的實現類便可。好比你能夠到數據庫、本地文件、網絡接口等方式讀取到數據源信息而後返回相應的數據源對象就能夠了。

DynamicDataSource.java

package com.louis.springboot.dynamic.datasource.dds;

import java.util.Map;

import javax.sql.DataSource;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

/**
 * 動態數據源實現類
 * @author Louis
 * @date Oct 31, 2018
 */
public class DynamicDataSource extends AbstractRoutingDataSource {
    
    
    /**
     * 若是不但願數據源在啓動配置時就加載好,能夠定製這個方法,從任何你但願的地方讀取並返回數據源
     * 好比從數據庫、文件、外部接口等讀取數據源信息,並最終返回一個DataSource實現類對象便可
     */
    @Override
    protected DataSource determineTargetDataSource() {
        return super.determineTargetDataSource();
    }
    
    /**
     * 若是但願全部數據源在啓動配置時就加載好,這裏經過設置數據源Key值來切換數據,定製這個方法
     */
    @Override
    protected Object determineCurrentLookupKey() {
        return DynamicDataSourceContextHolder.getDataSourceKey();
    }
    
    /**
     * 設置默認數據源
     * @param defaultDataSource
     */
    public void setDefaultDataSource(Object defaultDataSource) {
        super.setDefaultTargetDataSource(defaultDataSource);
    }
    
    /**
     * 設置數據源
     * @param dataSources
     */
    public void setDataSources(Map<Object, Object> dataSources) {
        super.setTargetDataSources(dataSources);
        // 將數據源的 key 放到數據源上下文的 key 集合中,用於切換時判斷數據源是否有效
        DynamicDataSourceContextHolder.addDataSourceKeys(dataSources.keySet());
    }
}

數據源上下文

動態數據源的切換主要是經過調用這個類的方法來完成的。在任何想要進行切換數據源的時候均可以經過調用這個類的方法實現切換。好比系統登陸時,根據用戶信息調用這個類的數據源切換方法切換到用戶對應的數據庫。

主要方法介紹:

1. 切換數據源

在任何想要進行切換數據源的時候均可以經過調用這個類的方法實現切換。

    /**
     * 切換數據源
     * @param key
     */
    public static void setDataSourceKey(String key) {
        contextHolder.set(key);
    }

2. 重置數據源

將數據源重置回默認的數據源。默認數據源經過 DynamicDataSource.setDefaultDataSource(ds) 進行設置。

    /**
     * 重置數據源
     */
    public static void clearDataSourceKey() {
        contextHolder.remove();
    }

3. 獲取當前數據源key

    /**
     * 獲取數據源
     * @return
     */
    public static String getDataSourceKey() {
        return contextHolder.get();
    }

完整代碼以下

DynamicDataSourceContextHolder.java

package com.louis.springboot.dynamic.datasource.dds;

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

/**
 * 動態數據源上下文
 * @author Louis
 * @date Oct 31, 2018
 */
public class DynamicDataSourceContextHolder {

    private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>() {
        /**
         * 將 master 數據源的 key做爲默認數據源的 key
         */
        @Override
        protected String initialValue() {
            return "master";
        }
    };


    /**
     * 數據源的 key集合,用於切換時判斷數據源是否存在
     */
    public static List<Object> dataSourceKeys = new ArrayList<>();

    /**
     * 切換數據源
     * @param key
     */
    public static void setDataSourceKey(String key) {
        contextHolder.set(key);
    }

    /**
     * 獲取數據源
     * @return
     */
    public static String getDataSourceKey() {
        return contextHolder.get();
    }

    /**
     * 重置數據源
     */
    public static void clearDataSourceKey() {
        contextHolder.remove();
    }

    /**
     * 判斷是否包含數據源
     * @param key 數據源key
     * @return
     */
    public static boolean containDataSourceKey(String key) {
        return dataSourceKeys.contains(key);
    }
    
    /**
     * 添加數據源keys
     * @param keys
     * @return
     */
    public static boolean addDataSourceKeys(Collection<? extends Object> keys) {
        return dataSourceKeys.addAll(keys);
    }
}

註解式數據源

到這裏,在任何想要動態切換數據源的時候,只要調用  DynamicDataSourceContextHolder.setDataSourceKey(key)  就能夠完成了。

接下來咱們實現經過註解的方式來進行數據源的切換,原理就是添加註解(如@DataSource(value="master")),而後實現註解切面進行數據源切換。

建立一個動態數據源註解,擁有一個value值,用於標識要切換的數據源的key。

DataSource.java

package com.louis.springboot.dynamic.datasource.dds;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 動態數據源註解
 * @author Louis
 * @date Oct 31, 2018
 */
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DataSource {
    
    /**
     * 數據源key值
     * @return
     */
    String value();
    
}

建立一個AOP切面,攔截帶 @DataSource 註解的方法,在方法執行前切換至目標數據源,執行完成後恢復到默認數據源。

DynamicDataSourceAspect.java

package com.louis.springboot.dynamic.datasource.dds;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

/**
 * 動態數據源切換處理器
 * @author Louis
 * @date Oct 31, 2018
 */
@Aspect
@Order(-1)  // 該切面應當先於 @Transactional 執行
@Component
public class DynamicDataSourceAspect {
    
    /**
     * 切換數據源
     * @param point
     * @param dataSource
     */
    @Before("@annotation(dataSource))")
    public void switchDataSource(JoinPoint point, DataSource dataSource) {
        if (!DynamicDataSourceContextHolder.containDataSourceKey(dataSource.value())) {
            System.out.println("DataSource [{}] doesn't exist, use default DataSource [{}] " + dataSource.value());
        } else {
            // 切換數據源
            DynamicDataSourceContextHolder.setDataSourceKey(dataSource.value());
            System.out.println("Switch DataSource to [" + DynamicDataSourceContextHolder.getDataSourceKey()
                + "] in Method [" + point.getSignature() + "]");
        }
    }

    /**
     * 重置數據源
     * @param point
     * @param dataSource
     */
    @After("@annotation(dataSource))")
    public void restoreDataSource(JoinPoint point, DataSource dataSource) {
        // 將數據源置爲默認數據源
        DynamicDataSourceContextHolder.clearDataSourceKey();
        System.out.println("Restore DataSource to [" + DynamicDataSourceContextHolder.getDataSourceKey() 
            + "] in Method [" + point.getSignature() + "]");
    }
}

到這裏,動態數據源相關的處理代碼就完成了。

編寫用戶業務代碼

接下來編寫用戶查詢業務代碼,用來進行測試,只需添加一個查詢接口便可。

編寫一個控制器,包含兩個查詢方法,分別註解 master 和 slave 數據源。

SysUserController.java

package com.louis.springboot.dynamic.datasource.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.louis.springboot.dynamic.datasource.dds.DataSource;
import com.louis.springboot.dynamic.datasource.service.SysUserService;

/**
 * 用戶控制器
 * @author Louis
 * @date Oct 31, 2018
 */
@RestController
@RequestMapping("user")
public class SysUserController {

    @Autowired
    private SysUserService sysUserService;
    
    
    @DataSource(value="master")
    @PostMapping(value="/findAll")
    public Object findAll() {
        return sysUserService.findAll();
    }
    
    @DataSource(value="slave")
    @PostMapping(value="/findAll2")
    public Object findAll2() {
        return sysUserService.findAll();
    }

}

 

下面是正常的業務代碼,沒有什麼好說明的,直接貼代碼了。

SysUser.java

public class SysUser {

    private Long id;
    
    private String name;

    private String password;

    private String salt;

    private String email;

    private String mobile;

    private Byte status;

    private Long deptId;
    
    private String deptName;
    
    private Byte delFlag;
    
    private String createBy;

    private Date createTime;

    private String lastUpdateBy;

    private Date lastUpdateTime;

  ...setter and getter }

 

SysUserMapper.java

package com.louis.springboot.dynamic.datasource.dao;

import java.util.List;

import com.louis.springboot.dynamic.datasource.model.SysUser;

public interface SysUserMapper {
    int deleteByPrimaryKey(Long id);

    int insert(SysUser record);

    int insertSelective(SysUser record);

    SysUser selectByPrimaryKey(Long id);

    int updateByPrimaryKeySelective(SysUser record);

    int updateByPrimaryKey(SysUser record);
    
    List<SysUser> findAll();
}

 

SysUserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.louis.springboot.dynamic.datasource.dao.SysUserMapper">
  <resultMap id="BaseResultMap" type="com.louis.springboot.dynamic.datasource.model.SysUser">
    <id column="id" jdbcType="BIGINT" property="id" />
    <result column="name" jdbcType="VARCHAR" property="name" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="salt" jdbcType="VARCHAR" property="salt" />
    <result column="email" jdbcType="VARCHAR" property="email" />
    <result column="mobile" jdbcType="VARCHAR" property="mobile" />
    <result column="status" jdbcType="TINYINT" property="status" />
    <result column="dept_id" jdbcType="BIGINT" property="deptId" />
    <result column="create_by" jdbcType="BIGINT" property="createBy" />
    <result column="create_time" jdbcType="TIMESTAMP" property="createTime" />
    <result column="last_update_by" jdbcType="BIGINT" property="lastUpdateBy" />
    <result column="last_update_time" jdbcType="TIMESTAMP" property="lastUpdateTime" />
    <result column="del_flag" jdbcType="TINYINT" property="delFlag" />
  </resultMap>
  <sql id="Base_Column_List">
    id, name, password, salt, email, mobile, status, dept_id, create_by, create_time, 
    last_update_by, last_update_time, del_flag
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from sys_user
    where id = #{id,jdbcType=BIGINT}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
    delete from sys_user
    where id = #{id,jdbcType=BIGINT}
  </delete>
  <insert id="insert" parameterType="com.louis.springboot.dynamic.datasource.model.SysUser">
    insert into sys_user (id, name, password, 
      salt, email, mobile, 
      status, dept_id, create_by, 
      create_time, last_update_by, last_update_time, 
      del_flag)
    values (#{id,jdbcType=BIGINT}, #{name,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{salt,jdbcType=VARCHAR}, #{email,jdbcType=VARCHAR}, #{mobile,jdbcType=VARCHAR}, 
      #{status,jdbcType=TINYINT}, #{deptId,jdbcType=BIGINT}, #{createBy,jdbcType=BIGINT}, 
      #{createTime,jdbcType=TIMESTAMP}, #{lastUpdateBy,jdbcType=BIGINT}, #{lastUpdateTime,jdbcType=TIMESTAMP}, 
      #{delFlag,jdbcType=TINYINT})
  </insert>
  <insert id="insertSelective" parameterType="com.louis.springboot.dynamic.datasource.model.SysUser">
    insert into sys_user
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="id != null">
        id,
      </if>
      <if test="name != null">
        name,
      </if>
      <if test="password != null">
        password,
      </if>
      <if test="salt != null">
        salt,
      </if>
      <if test="email != null">
        email,
      </if>
      <if test="mobile != null">
        mobile,
      </if>
      <if test="status != null">
        status,
      </if>
      <if test="deptId != null">
        dept_id,
      </if>
      <if test="createBy != null">
        create_by,
      </if>
      <if test="createTime != null">
        create_time,
      </if>
      <if test="lastUpdateBy != null">
        last_update_by,
      </if>
      <if test="lastUpdateTime != null">
        last_update_time,
      </if>
      <if test="delFlag != null">
        del_flag,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="id != null">
        #{id,jdbcType=BIGINT},
      </if>
      <if test="name != null">
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="salt != null">
        #{salt,jdbcType=VARCHAR},
      </if>
      <if test="email != null">
        #{email,jdbcType=VARCHAR},
      </if>
      <if test="mobile != null">
        #{mobile,jdbcType=VARCHAR},
      </if>
      <if test="status != null">
        #{status,jdbcType=TINYINT},
      </if>
      <if test="deptId != null">
        #{deptId,jdbcType=BIGINT},
      </if>
      <if test="createBy != null">
        #{createBy,jdbcType=BIGINT},
      </if>
      <if test="createTime != null">
        #{createTime,jdbcType=TIMESTAMP},
      </if>
      <if test="lastUpdateBy != null">
        #{lastUpdateBy,jdbcType=BIGINT},
      </if>
      <if test="lastUpdateTime != null">
        #{lastUpdateTime,jdbcType=TIMESTAMP},
      </if>
      <if test="delFlag != null">
        #{delFlag,jdbcType=TINYINT},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.louis.springboot.dynamic.datasource.model.SysUser">
    update sys_user
    <set>
      <if test="name != null">
        name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        password = #{password,jdbcType=VARCHAR},
      </if>
      <if test="salt != null">
        salt = #{salt,jdbcType=VARCHAR},
      </if>
      <if test="email != null">
        email = #{email,jdbcType=VARCHAR},
      </if>
      <if test="mobile != null">
        mobile = #{mobile,jdbcType=VARCHAR},
      </if>
      <if test="status != null">
        status = #{status,jdbcType=TINYINT},
      </if>
      <if test="deptId != null">
        dept_id = #{deptId,jdbcType=BIGINT},
      </if>
      <if test="createBy != null">
        create_by = #{createBy,jdbcType=BIGINT},
      </if>
      <if test="createTime != null">
        create_time = #{createTime,jdbcType=TIMESTAMP},
      </if>
      <if test="lastUpdateBy != null">
        last_update_by = #{lastUpdateBy,jdbcType=BIGINT},
      </if>
      <if test="lastUpdateTime != null">
        last_update_time = #{lastUpdateTime,jdbcType=TIMESTAMP},
      </if>
      <if test="delFlag != null">
        del_flag = #{delFlag,jdbcType=TINYINT},
      </if>
    </set>
    where id = #{id,jdbcType=BIGINT}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.louis.springboot.dynamic.datasource.model.SysUser">
    update sys_user
    set name = #{name,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      salt = #{salt,jdbcType=VARCHAR},
      email = #{email,jdbcType=VARCHAR},
      mobile = #{mobile,jdbcType=VARCHAR},
      status = #{status,jdbcType=TINYINT},
      dept_id = #{deptId,jdbcType=BIGINT},
      create_by = #{createBy,jdbcType=BIGINT},
      create_time = #{createTime,jdbcType=TIMESTAMP},
      last_update_by = #{lastUpdateBy,jdbcType=BIGINT},
      last_update_time = #{lastUpdateTime,jdbcType=TIMESTAMP},
      del_flag = #{delFlag,jdbcType=TINYINT}
    where id = #{id,jdbcType=BIGINT}
  </update>
  <select id="findAll" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from sys_user
  </select>
</mapper>

 

SysUserService.java

package com.louis.springboot.dynamic.datasource.service;

import java.util.List;

import com.louis.springboot.dynamic.datasource.model.SysUser;

/**
 * 用戶管理
 * @author Louis
 * @date Oct 31, 2018
 */
public interface SysUserService {

    /**
     * 查找所有用戶信息
     * @return
     */
    List<SysUser> findAll();
}

 

SysUserServiceImpl.java

package com.louis.springboot.dynamic.datasource.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.louis.springboot.dynamic.datasource.dao.SysUserMapper;
import com.louis.springboot.dynamic.datasource.model.SysUser;
import com.louis.springboot.dynamic.datasource.service.SysUserService;

@Service
public class SysUserServiceImpl  implements SysUserService {

    @Autowired
    private SysUserMapper sysUserMapper;

    /**
     * 查找所有用戶信息
     * @return
     */
    public List<SysUser> findAll() {
        return sysUserMapper.findAll();
    }
    
}

 

測試效果

啓動系統,訪問 http://localhost:8080/swagger-ui.html,分別測試兩個接口,成功返回數據。

user/findAll (master數據源)

 

user/findAll2 (slave數據源)

 

 

源碼下載

碼雲:https://gitee.com/liuge1988/spring-boot-demo.git


做者:朝雨憶輕塵
出處:https://www.cnblogs.com/xifengxiaoma/ 版權全部,歡迎轉載,轉載請註明原文做者及出處。

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