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)。考慮到可以跨服務(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(lèi)

我們可以建立個(gè)datasourceBean文件夾專(zhuān)門(mén)管理數(shù)據(jù)源的實(shí)體類(lèi)。

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

@Configurationpublic 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; }}

@Configurationpublic 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; }}

@Configurationpublic 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(lèi)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(lèi)

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(lài)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(lài)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好吧啦網(wǎng)。