1. Bina pangkalan data dan jadual
1 demo pangkalan data1 letakkan jadual pengguna
SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for user -- ---------------------------- DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of user -- ---------------------------- INSERT INTO `user` VALUES ('1', 'aa'); INSERT INTO `user` VALUES ('2', 'bb');
2 jadual peranan
SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for role -- ---------------------------- DROP TABLE IF EXISTS `role`; CREATE TABLE `role` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of role -- ---------------------------- INSERT INTO `role` VALUES ('1', 'CC'); INSERT INTO `role` VALUES ('2', 'DD');
2. pakej import pom.xml
<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> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-thymeleaf</artifactid> </dependency> <dependency> <groupid>mysql</groupid> <artifactid>mysql-connector-java</artifactid> <scope>runtime</scope> </dependency> <dependency> <groupid>mysql</groupid> <artifactid>mysql-connector-java</artifactid> </dependency> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-jdbc</artifactid> </dependency> <dependency> <groupid>org.mybatis.spring.boot</groupid> <artifactid>mybatis-spring-boot-starter</artifactid> <version>2.0.1</version> </dependency> <!-- aop --> <dependency> <groupid>org.aspectj</groupid> <artifactid>aspectjweaver</artifactid> </dependency> <!-- alibaba druid--> <dependency> <groupid>com.alibaba</groupid> <artifactid>druid-spring-boot-starter</artifactid> <version>1.1.10</version> </dependency> <!-- dynamic--> <dependency> <groupid>com.typesafe.dynamicdatasource</groupid> <artifactid>dynamic-data-source_2.11</artifactid> </dependency>
3. Jana dengan pemalam penjana Kelas entiti jadual pengguna dan peranan, mapper.java, mapper.xml
User.java Role.java UserMapper.java RoleMapper.java UserMapper.xml RoleMapper.xml
4. Konfigurasikan application.yml
server: port: 8088 mybatis: mapper-locations: classpath:mapper/*.xml spring: datasource: db1: url: jdbc:mysql://localhost:3306/demo1?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT username: root password: root type: com.alibaba.druid.pool.DruidDataSource #驱动包 driver-class-name: com.mysql.cj.jdbc.Driver #初始连接数 initial-size: 5 #最小空闲数 min-idle: 5 #最大活动数 max-active: 20 #等待超时时间 max-wait: 60000 #配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 time-between-eviction-runs-millis: 60000 # 配置一个连接在池中最小生存的时间,单位是毫秒 min-evictable-idle-time-millis: 300000 #验证数据库连接的查询语句,MYSQL是select 1 validation-query: SELECT 1 FROM DUAL #空闲时测试,testOnBorrow和testOnReturn在生产环境一般是不开启的,主要是性能考虑。失效连接主要通过testWhileIdle保证 test-while-idle: true test-on-borrow: false test-on-return: false #打开PSCache,并指定每个链接上的PSCache大小 pool-prepared-statements: true max-pool-prepared-statement-per-connection-size: 20 #配置监控统计拦截的filters,去掉后监控界面sql无法统计,‘wall'用于防火墙,此处是filter修改的地方 filters: stat,wall #通过connectproperties属性来打开mergesql功能:慢sql记录 connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000 #合并多个DruidDataSource useGlobalDataSourceStat: true db2: url: jdbc:mysql://localhost:3306/demo2?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT username: root password: root type: com.alibaba.druid.pool.DruidDataSource #驱动包 driver-class-name: com.mysql.cj.jdbc.Driver #初始连接数 initial-size: 5 #最小空闲数 min-idle: 5 #最大活动数 max-active: 20 #等待超时时间 max-wait: 60000 #配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 time-between-eviction-runs-millis: 60000 # 配置一个连接在池中最小生存的时间,单位是毫秒 min-evictable-idle-time-millis: 300000 #验证数据库连接的查询语句,MYSQL是select 1 validation-query: SELECT 1 FROM DUAL #空闲时测试,testOnBorrow和testOnReturn在生产环境一般是不开启的,主要是性能考虑。失效连接主要通过testWhileIdle保证 test-while-idle: true test-on-borrow: false test-on-return: false #打开PSCache,并指定每个链接上的PSCache大小 pool-prepared-statements: true max-pool-prepared-statement-per-connection-size: 20 #配置监控统计拦截的filters,去掉后监控界面sql无法统计,‘wall'用于防火墙,此处是filter修改的地方 filters: stat,wall #通过connectproperties属性来打开mergesql功能:慢sql记录 connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000 #合并多个DruidDataSource useGlobalDataSourceStat: true
5. Mulakan kelas mengimbas fail mapper.java
@SpringBootApplication @MapperScan("com.example.demo.dao") public class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } }
6. Takrifkan DataSourceConfig, import konfigurasi dalam application.yml ke dalam DataSource dan masukkannya ke dalam kacang
@Configuration public class DataSourceConfig { //从配置文件配置数据源 @Primary @Bean(name="datasource1") @ConfigurationProperties("spring.datasource.db1") public DataSource dataSource1(){ return new DruidDataSource(); } //从配置文件配置数据源 @Bean(name="datasource2") @ConfigurationProperties("spring.datasource.db2") public DataSource dataSource2(){ return new DruidDataSource(); } //动态数据源 进行数据源切换 @Bean(name="dynamicDataSource") public DataSource dynamicDataSource(){ DynamicDataSource dynamicDatasource=new DynamicDataSource(); //设置默认数据源 dynamicDatasource.setDefaultTargetDataSource(dataSource1()); //配置多数据源 Map<object> dsMap=new HashMap(); dsMap.put("datasource1",dataSource1()); dsMap.put("datasource2",dataSource2()); //将多数据源放到数据源池中 dynamicDatasource.setTargetDataSources(dsMap); return dynamicDatasource; } }</object>
7 Tentukan kelas pensuisan sumber data dinamik DynamicDataSourceContextHolder
Tentukan kelas sumber data dinamik Dyce
public class DynamicDataSourceContextHolder { private static final ThreadLocal<string> contextHolder=new ThreadLocal(); //设置数据源名称 public static void setDB(String dbType){ contextHolder.set(dbType); } //获取数据源名称 public static String getDB(){ return contextHolder.get(); } //清除数据源名 public static void clearDB(){ contextHolder.remove(); } }</string>
9. Tentukan kelas konfigurasi mybatis dan letakkan DynamicDataSource ke dalam SqlSessionFactoryBean
public class DynamicDataSource extends AbstractRoutingDataSource { @Override protected Object determineCurrentLookupKey() { return DynamicDataSourceContextHolder.getDB(); } }
10 sumber data TargetDataSource
@EnableTransactionManagement @Configuration public class MyBatisConfig { @Resource(name = "dynamicDataSource") private DataSource dynamicDataSource; @Bean public SqlSessionFactory sqlSessionFactory() throws Exception { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setDataSource(dynamicDataSource);//将动态数据源bean配置到sqlsessionfactory sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml")); return sqlSessionFactoryBean.getObject(); } @Bean public PlatformTransactionManager platformTransactionManager() { return new DataSourceTransactionManager(dynamicDataSource); } }
11. Tentukan aspek DynamicDataSourceAspect, yang digunakan untuk memintas anotasi dan melaksanakan fungsi penukaran sumber data
12. Ujian kelas Ujian
@Target({ElementType.METHOD,ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface TargetDataSource { String value() default "datasource1"; }
Ujian
1 >
Kembali http://localhost:8088/ds1
↓
2. Masukkan
Kembalihttp://localhost:8088/ds2
↓
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