SpringBoot Mybatis動(dòng)態(tài)數(shù)據(jù)源切換方案實(shí)現(xiàn)過(guò)程

更新時(shí)間：2020年04月17日 10:01:21 作者：經(jīng)典雞翅

這篇文章主要介紹了SpringBoot+Mybatis實(shí)現(xiàn)動(dòng)態(tài)數(shù)據(jù)源切換方案過(guò)程,文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友可以參考下

背景

最近讓我做一個(gè)大數(shù)據(jù)的系統(tǒng)，分析了一下，麻煩的地方就是多數(shù)據(jù)源切換抽取數(shù)據(jù)?？紤]到可以跨服務(wù)器跨數(shù)據(jù)庫(kù)抽數(shù)，再整理數(shù)據(jù)，就配置了這個(gè)動(dòng)態(tài)數(shù)據(jù)源的解決方案。在此分享給大家。

實(shí)現(xiàn)方案

數(shù)據(jù)庫(kù)配置文件

我們項(xiàng)目使用的是yml形式的配置文件，采用的是hikari的數(shù)據(jù)庫(kù)連接池。第一步我們自然是配置多個(gè)數(shù)據(jù)庫(kù)源頭。
我們找到spring的datasource，在下方配置三個(gè)數(shù)據(jù)源。

spring:
 application:
 name: dynamicDatasource
 datasource:
 test1:
  driver-class-name: com.mysql.jdbc.Driver
  url: jdbc:mysql://127.0.0.1:3306/test1?serverTimezone=GMT%2B8&characterEncoding=utf-8&useSSL=false
  username: root
  password: 123456
 test2:
  driver-class-name: com.mysql.jdbc.Driver
  url: jdbc:mysql://127.0.0.1:3306/test2?serverTimezone=GMT%2B8&characterEncoding=utf-8&useSSL=false
  username: root
  password: 123456
 test3:
  driver-class-name: com.mysql.jdbc.Driver
  url: jdbc:mysql://127.0.0.1:3306/test3?serverTimezone=GMT%2B8&characterEncoding=utf-8&useSSL=false
  username: root
  password: 123456
 hikari:
  leak-detection-threshold: 2000

定義數(shù)據(jù)源實(shí)體類

我們可以建立個(gè)datasourceBean文件夾專門管理數(shù)據(jù)源的實(shí)體類。

我們這里要建立三個(gè)實(shí)體類。分別對(duì)應(yīng)test1，test2，test3

@Configuration
public class Test1DataSourceBean {

 @Value("${spring.datasource.test1.driver-class-name}")
 private String test1Driver;

 @Value("${spring.datasource.test1.url}")
 private String test1Url;

 @Value("${spring.datasource.test1.username}")
 private String test1Username;

 @Value("${spring.datasource.test1.password}")
 private String test1Password;

 @Bean(name="test1DataSource")
 public DataSource test1DataSource() throws Exception{
  HikariDataSource dataSource = new HikariDataSource();
  dataSource.setDriverClassName(test1Driver);
  dataSource.setJdbcUrl(test1Url);
  dataSource.setUsername(test1Username);
  dataSource.setPassword(test1Password);
  return dataSource;
 }
}

@Configuration
public class Test2DataSourceBean {

 @Value("${spring.datasource.test2.driver-class-name}")
 private String test2Driver;

 @Value("${spring.datasource.test2.url}")
 private String test2Url;

 @Value("${spring.datasource.test2.username}")
 private String test2Username;

 @Value("${spring.datasource.test2.password}")
 private String test2Password;

 @Bean(name="test2DataSource")
 public DataSource test2DataSource() throws Exception{
  HikariDataSource dataSource = new HikariDataSource();
  dataSource.setDriverClassName(test2Driver);
  dataSource.setJdbcUrl(test2Url);
  dataSource.setUsername(test2Username);
  dataSource.setPassword(test2Password);
  return dataSource;
 }
}

@Configuration
public class Test3DataSourceBean {

 @Value("${spring.datasource.test3.driver-class-name}")
 private String test3Driver;

 @Value("${spring.datasource.test3.url}")
 private String test3Url;

 @Value("${spring.datasource.test3.username}")
 private String test3Username;

 @Value("${spring.datasource.test3.password}")
 private String test3Password;

 @Bean(name="test3DataSource")
 public DataSource test3DataSource() throws Exception{
  HikariDataSource dataSource = new HikariDataSource();
  dataSource.setDriverClassName(test3Driver);
  dataSource.setJdbcUrl(test3Url);
  dataSource.setUsername(test3Username);
  dataSource.setPassword(test3Password);
  return dataSource;
 }
}

定義一個(gè)枚舉類管理數(shù)據(jù)源

public enum DatabaseType {

 test1("test1", "test1"),
 test2("test2", "test2"),
 test3("test3","test3");

 private String name;
 private String value;

 DatabaseType(String name, String value){
  this.name = name;
  this.value = value;
 }

 public String getName(){
  return name;
 }

 public String getValue(){
  return value;
 }
}

定義一個(gè)線程安全的數(shù)據(jù)源容器

public class DatabaseContextHolder {
 private static final ThreadLocal<DatabaseType> contextHolder = new ThreadLocal<>();
 public static void setDatabaseType(DatabaseType type){
  contextHolder.set(type);
 }
 public static DatabaseType getDatabaseType(){
  return contextHolder.get();
 }
}

定義動(dòng)態(tài)數(shù)據(jù)源

public class DynamicDataSource extends AbstractRoutingDataSource{
 protected Object determineCurrentLookupKey() {
  return DatabaseContextHolder.getDatabaseType();
 }
}

mybatis配置類

網(wǎng)上的很多文章配置出來(lái)都會(huì)產(chǎn)生數(shù)據(jù)源循環(huán)依賴的問(wèn)題，這里解決了這個(gè)問(wèn)題。

@Configuration
@MapperScan(basePackages="cn.test.jichi", sqlSessionFactoryRef="sessionFactory")
public class MybatisConfig {

 /**
  * @Description:設(shè)置動(dòng)態(tài)數(shù)據(jù)源
  */
 @Bean(name="dynamicDataSource")
 @Primary
 public DynamicDataSource DataSource(
   @Qualifier("test1DataSource") DataSource test1DataSource,
   @Qualifier("test2DataSource") DataSource test2DataSource,
   @Qualifier("test3DataSource") DataSource test3DataSource){
  Map<Object, Object> targetDataSource = new HashMap<>();
  targetDataSource.put(DatabaseType.test1, test1DataSource);
  targetDataSource.put(DatabaseType.test2, test2DataSource);
  targetDataSource.put(DatabaseType.test3, test3DataSource);
  DynamicDataSource dataSource = new DynamicDataSource();
  dataSource.setTargetDataSources(targetDataSource);
  dataSource.setDefaultTargetDataSource(test1DataSource);
  return dataSource;
 }

 /**
  * @Description:根據(jù)動(dòng)態(tài)數(shù)據(jù)源創(chuàng)建sessionFactory
  */
 @Bean(name="sessionFactory")
 public SqlSessionFactory sessionFactory(
   @Qualifier("test1DataSource") DataSource test1DataSource,
   @Qualifier("test2DataSource") DataSource test2DataSource,
   @Qualifier("test3DataSource") DataSource test3DataSource) throws Exception{
  SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
  //構(gòu)造方法，解決動(dòng)態(tài)數(shù)據(jù)源循環(huán)依賴問(wèn)題。
  sessionFactoryBean.setDataSource(this.DataSource(test1DataSource,test2DataSource, test3DataSource));
  return sessionFactoryBean.getObject();
 }
}

示例

 public void testDymnaicDatasource(){
  //不切換數(shù)據(jù)源默認(rèn)是自己的。
  System.out.println("-----默認(rèn)數(shù)據(jù)源");
  DemoEntity totalCount = demoMapper.getTotalCount();
  String nameCount1 = totalCount.getNameCount();
  String ageCount2 = totalCount.getAgeCount();
  System.out.println("nameCount:"+nameCount1);
  System.out.println("ageCount:"+ageCount2);
  //數(shù)據(jù)源切換為branch
  System.out.println("-----數(shù)據(jù)源為test2");
  DynamicDataSourceUtils.chooseBranchDataSource();
  Integer nameCount = demoMapper.getNameCount();
  Integer ageCount = demoMapper.getAgeCount();
  System.out.println("nameCount:"+nameCount);
  System.out.println("ageCount:"+ageCount);
  //數(shù)據(jù)源為basic
  System.out.println("-----數(shù)據(jù)源為test3");
  DynamicDataSourceUtils.chooseBasicDataSource();
  Integer ageCount1 = demoMapper.getAgeCount();
  System.out.println("ageCount:"+ageCount1);

 }

總結(jié)

至此實(shí)現(xiàn)了多數(shù)據(jù)源的動(dòng)態(tài)切換。可以在同一個(gè)方法里面進(jìn)行操作多個(gè)數(shù)據(jù)源。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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