内容简介:MyBatis多数据源的配置主要有两种方式:第二种配置相对灵活,示例如下:控制台输出:
MyBatis多数据源的配置主要有两种方式:
- 通过@MapperScan注解,对不同包下的Mapper使用不同的sqlSessionFactory
- 通过@MapperScan注解加自定义注解,对使用不同注解的Mapper使用不同的sqlSessionFactory
第二种配置相对灵活,示例如下:
package bj; import ch.qos.logback.classic.Level; import ch.qos.logback.classic.Logger; import com.zaxxer.hikari.HikariDataSource; import io.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration; import org.apache.ibatis.annotations.Mapper; import org.apache.ibatis.annotations.Select; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.annotation.MapperScan; import org.slf4j.LoggerFactory; import org.springframework.boot.SpringApplication; import org.springframework.boot.WebApplicationType; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.context.event.ApplicationReadyEvent; import org.springframework.context.ApplicationListener; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import org.springframework.jdbc.core.JdbcTemplate; import javax.annotation.Resource; import javax.sql.DataSource; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import java.util.List; import java.util.Map; /** * Created by BaiJiFeiLong@gmail.com at 2018/12/6 下午9:29 * <p> * MyBatis多数据源演示 */ @SpringBootApplication(exclude = {SpringBootConfiguration.class}) @Configuration @MapperScan(annotationClass = Mapper.class, basePackageClasses = MyBatisApp.class, sqlSessionFactoryRef = "sqlSessionFactory") public class MyBatisApp implements ApplicationListener<ApplicationReadyEvent> { /** * SecondaryMapper配置 * \@MapperScan 注解一次只能添加一个,所以需要单独再加一个配置类 * 自定义@MapperScan会替换MyBatis自动添加的默认@MapperScan。所以主@MapperScan也必须显式添加 */ @Configuration @MapperScan(annotationClass = SecondaryMapper.class, basePackageClasses = MyBatisApp.class, sqlSessionFactoryRef = "sqlSessionFactorySecond") static class SecondaryMapperConfiguration { } public static void main(String[] args) { new SpringApplication(MyBatisApp.class) {{ setWebApplicationType(WebApplicationType.NONE); }}.run(args); } @Resource private DataSource dataSource; @Resource private DataSource dataSourceSecond; @Resource private JdbcTemplate jdbcTemplate; @Resource private UserMapper userMapper; @Resource private SecondaryUserMapper secondaryUserMapper; private void initLogger() { ((Logger) LoggerFactory.getLogger(MyBatisApp.class)).setLevel(Level.DEBUG); ((Logger) LoggerFactory.getLogger(JdbcTemplate.class)).setLevel(Level.DEBUG); } private void initDatabase() { String oldDatabase = jdbcTemplate.queryForObject("SELECT DATABASE()", String.class); jdbcTemplate.execute("DROP SCHEMA IF EXISTS one"); jdbcTemplate.execute("CREATE SCHEMA one"); jdbcTemplate.execute("USE one"); jdbcTemplate.execute("CREATE TABLE user(id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(32) CHARSET 'utf8')"); jdbcTemplate.execute("INSERT INTO user(name) VALUES ('人民的儿子')"); jdbcTemplate.execute("INSERT INTO user(name) VALUES ('人民的孙子')"); jdbcTemplate.execute("INSERT INTO user(name) VALUES ('人民的曾孙子')"); jdbcTemplate.execute("DROP SCHEMA IF EXISTS two"); jdbcTemplate.execute("CREATE SCHEMA two"); jdbcTemplate.execute("USE two"); jdbcTemplate.execute("CREATE TABLE user(id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(32) CHARSET 'utf8')"); jdbcTemplate.execute("INSERT INTO user(name) VALUES ('人民的爹')"); jdbcTemplate.execute("INSERT INTO user(name) VALUES ('人民的爷')"); jdbcTemplate.execute("INSERT INTO user(name) VALUES ('人民的太爷')"); jdbcTemplate.execute("INSERT INTO user(name) VALUES ('人民的老太爷')"); jdbcTemplate.execute("USE " + oldDatabase); } @Override public void onApplicationEvent(ApplicationReadyEvent applicationReadyEvent) { initLogger(); initDatabase(); System.out.println("Users:"); userMapper.selectAll().forEach(System.out::println); System.out.println("Secondary users:"); secondaryUserMapper.selectAll().forEach(System.out::println); } /** * 主数据源 * <p> * 如果不添加@Primary注解, MyBatis可以工作,但是JdbcTemplate无法注入 * * @return . */ @Primary @Bean public DataSource dataSource() { return new HikariDataSource() {{ setJdbcUrl("jdbc:mysql://localhost/one?useUnicode=true&characterEncoding=utf8"); setUsername("root"); setPassword("root"); }}; } /** * 副数据源 * * @return . */ @Bean public DataSource dataSourceSecond() { return new HikariDataSource() {{ setJdbcUrl("jdbc:mysql://localhost/two?useUnicode=true&characterEncoding=utf8"); setUsername("root"); setPassword("root"); }}; } /** * 主SqlSessionFactory。使用主数据源。自定义SqlSessionFactory后,MyBatis就不自动添加SqlSessionFactory了,所以必须有 * * @return . * @throws Exception . */ @Bean public SqlSessionFactory sqlSessionFactory() throws Exception { return new SqlSessionFactoryBean() {{ setDataSource(dataSource); }}.getObject(); } /** * 副SqlSessionFactory。使用副数据源 * * @return . * @throws Exception . */ @Bean public SqlSessionFactory sqlSessionFactorySecond() throws Exception { return new SqlSessionFactoryBean() {{ setDataSource(dataSourceSecond); }}.getObject(); } @Mapper interface UserMapper { @Select("SELECT * FROM user") List<Map<String, Object>> selectAll(); } @SecondaryMapper interface SecondaryUserMapper { @Select("SELECT * FROM user") List<Map<String, Object>> selectAll(); } /** * 自定义Mapper注解,用于标识使用的数据源 */ @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @interface SecondaryMapper { } }
控制台输出:
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.1.0.RELEASE) 2018-12-07 11:49:02.596 INFO 5154 --- [ main] bj.MyBatisApp : Starting MyBatisApp on MacBook-Air-2.local with PID 5154 (/Users/yuchao/temp/java/hellomaven/target/classes started by yuchao in /Users/yuchao/temp/java/hellomaven) 2018-12-07 11:49:02.633 INFO 5154 --- [ main] bj.MyBatisApp : No active profile set, falling back to default profiles: default 2018-12-07 11:49:05.341 INFO 5154 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2018-12-07 11:49:05.499 INFO 5154 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed. 2018-12-07 11:49:05.547 INFO 5154 --- [ main] org.quartz.impl.StdSchedulerFactory : Using default implementation for ThreadExecutor 2018-12-07 11:49:05.569 INFO 5154 --- [ main] org.quartz.core.SchedulerSignalerImpl : Initialized Scheduler Signaller of type: class org.quartz.core.SchedulerSignalerImpl 2018-12-07 11:49:05.569 INFO 5154 --- [ main] org.quartz.core.QuartzScheduler : Quartz Scheduler v.2.3.0 created. 2018-12-07 11:49:05.570 INFO 5154 --- [ main] org.quartz.simpl.RAMJobStore : RAMJobStore initialized. 2018-12-07 11:49:05.571 INFO 5154 --- [ main] org.quartz.core.QuartzScheduler : Scheduler meta-data: Quartz Scheduler (v2.3.0) 'quartzScheduler' with instanceId 'NON_CLUSTERED' Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally. NOT STARTED. Currently in standby mode. Number of jobs executed: 0 Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 10 threads. Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered. 2018-12-07 11:49:05.571 INFO 5154 --- [ main] org.quartz.impl.StdSchedulerFactory : Quartz scheduler 'quartzScheduler' initialized from an externally provided properties instance. 2018-12-07 11:49:05.571 INFO 5154 --- [ main] org.quartz.impl.StdSchedulerFactory : Quartz scheduler version: 2.3.0 2018-12-07 11:49:05.571 INFO 5154 --- [ main] org.quartz.core.QuartzScheduler : JobFactory set to: org.springframework.scheduling.quartz.SpringBeanJobFactory@769a58e5 2018-12-07 11:49:05.780 WARN 5154 --- [ main] reactor.netty.tcp.TcpResources : [http] resources will use the default LoopResources: DefaultLoopResources {prefix=reactor-http, daemon=true, selectCount=4, workerCount=4} 2018-12-07 11:49:05.780 WARN 5154 --- [ main] reactor.netty.tcp.TcpResources : [http] resources will use the default ConnectionProvider: PooledConnectionProvider {name=http, poolFactory=reactor.netty.resources.ConnectionProvider$$Lambda$284/1788545647@10667848} 2018-12-07 11:49:06.061 INFO 5154 --- [ main] o.s.s.quartz.SchedulerFactoryBean : Starting Quartz Scheduler now 2018-12-07 11:49:06.062 INFO 5154 --- [ main] org.quartz.core.QuartzScheduler : Scheduler quartzScheduler_$_NON_CLUSTERED started. 2018-12-07 11:49:06.079 INFO 5154 --- [ main] bj.MyBatisApp : Started MyBatisApp in 4.645 seconds (JVM running for 6.354) 2018-12-07 11:49:06.084 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL query [SELECT DATABASE()] 2018-12-07 11:49:06.105 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [DROP SCHEMA IF EXISTS one] 2018-12-07 11:49:06.115 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [CREATE SCHEMA one] 2018-12-07 11:49:06.117 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [USE one] 2018-12-07 11:49:06.119 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [CREATE TABLE user(id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(32) CHARSET 'utf8')] 2018-12-07 11:49:06.153 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [INSERT INTO user(name) VALUES ('人民的儿子')] 2018-12-07 11:49:06.157 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [INSERT INTO user(name) VALUES ('人民的孙子')] 2018-12-07 11:49:06.161 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [INSERT INTO user(name) VALUES ('人民的曾孙子')] 2018-12-07 11:49:06.164 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [DROP SCHEMA IF EXISTS two] 2018-12-07 11:49:06.174 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [CREATE SCHEMA two] 2018-12-07 11:49:06.176 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [USE two] 2018-12-07 11:49:06.178 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [CREATE TABLE user(id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(32) CHARSET 'utf8')] 2018-12-07 11:49:06.226 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [INSERT INTO user(name) VALUES ('人民的爹')] 2018-12-07 11:49:06.231 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [INSERT INTO user(name) VALUES ('人民的爷')] 2018-12-07 11:49:06.235 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [INSERT INTO user(name) VALUES ('人民的太爷')] 2018-12-07 11:49:06.243 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [INSERT INTO user(name) VALUES ('人民的老太爷')] 2018-12-07 11:49:06.246 DEBUG 5154 --- [ main] o.s.jdbc.core.JdbcTemplate : Executing SQL statement [USE one] Users: 2018-12-07 11:49:06.271 DEBUG 5154 --- [ main] bj.MyBatisApp$UserMapper.selectAll : ==> Preparing: SELECT * FROM user 2018-12-07 11:49:06.297 DEBUG 5154 --- [ main] bj.MyBatisApp$UserMapper.selectAll : ==> Parameters: 2018-12-07 11:49:06.314 DEBUG 5154 --- [ main] bj.MyBatisApp$UserMapper.selectAll : <== Total: 3 {name=人民的儿子, id=1} {name=人民的孙子, id=2} {name=人民的曾孙子, id=3} Secondary users: 2018-12-07 11:49:06.318 INFO 5154 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-2 - Starting... 2018-12-07 11:49:06.324 INFO 5154 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-2 - Start completed. 2018-12-07 11:49:06.325 DEBUG 5154 --- [ main] b.M.selectAll : ==> Preparing: SELECT * FROM user 2018-12-07 11:49:06.325 DEBUG 5154 --- [ main] b.M.selectAll : ==> Parameters: 2018-12-07 11:49:06.328 DEBUG 5154 --- [ main] b.M.selectAll : <== Total: 4 {name=人民的爹, id=1} {name=人民的爷, id=2} {name=人民的太爷, id=3} {name=人民的老太爷, id=4}
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