How does springboot connect two databases?
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First, start the class
1. Startup class requires @ MapperScan annotation without mybatis
@ SpringBootApplicationpublic class AppPush {public static void main (String [] args) {SpringApplication.run (AppPush.class,args);}} II. Application.yml file
Configure two or more database connections. I use postgresql here, and the same is true with mysql, etc.
Spring: datasource:# driver-class-name: org.postgresql.Driver# url: jdbc:postgresql://127.0.0.1/aaa# username: root# password: root one: driver-class-name: org.postgresql.Driver url: jdbc:postgresql://127.0.0.1/aaa username: root password: root two: driver-class-name: org.postgresql. Driver url: jdbc:postgresql://127.0.0.1/bbb username: root password: root Create a configuration class
1. Note: @ MapperScan's basePackages is the path to your package.
SqlSessionFactoryRef can be named freely, but the two classes cannot be repeated!
One configuration class
Package com.wys.config;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;import org.springframework.boot.context.properties.ConfigurationProperties;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.DriverManagerDataSource;import javax.sql.DataSource;/** * @ program: * @ description: database configuration 1 * @ author: wys * @ create: 2019-12-03 16:20 * * / @ Configuration@MapperScan (basePackages = "com.wys.mapper.**", sqlSessionFactoryRef = "oneSqlSessionFactory") public class OneDataSourceConfig {@ Value ("${spring.datasource.one.driver-class-name}") String driverClass @ Value ("${spring.datasource.one.url}") String url; @ Value ("${spring.datasource.one.username}") String userName; @ Value ("${spring.datasource.one.password}") String passWord; @ Primary @ Bean (name = "oneDataSource") @ ConfigurationProperties ("spring.datasource.one") public DataSource masterDataSource () {DriverManagerDataSource dataSource = new DriverManagerDataSource (); dataSource.setDriverClassName (driverClass) DataSource.setUrl (url); dataSource.setUsername (userName); dataSource.setPassword (passWord); return dataSource;} @ Bean (name = "oneSqlSessionFactory") public SqlSessionFactory sqlSessionFactory (@ Qualifier ("oneDataSource") DataSource dataSource) throws Exception {SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean (); sessionFactoryBean.setDataSource (dataSource) SessionFactoryBean.setMapperLocations (new PathMatchingResourcePatternResolver () .getResources ("classpath:mybatis/mapper-postgre/*.xml")); return sessionFactoryBean.getObject ();} @ Bean (name = "oneSqlSessionTemplate") public SqlSessionTemplate sqlSessionFactoryTemplate (@ Qualifier ("oneSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {return new SqlSessionTemplate (sqlSessionFactory);}}
Two configuration class
Package com.wys.config;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;import org.springframework.boot.context.properties.ConfigurationProperties;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.DriverManagerDataSource;import javax.sql.DataSource;/** * @ program: * @ description: database configuration 2 * @ author: wys * @ create: 2019-12-03 17:03 * * / @ Configuration@MapperScan (basePackages = "com.wys.mappers", sqlSessionFactoryRef = "twoSqlSessionFactory") public class TwoDataSourceConfig {@ Value ("${spring.datasource.two.driver-class-name}") String driverClass @ Value ("${spring.datasource.two.url}") String url; @ Value ("${spring.datasource.two.username}") String userName; @ Value ("${spring.datasource.two.password}") String passWord; @ Bean (name = "twoDataSource") @ ConfigurationProperties ("spring.datasource.two") public DataSource masterDataSource () {DriverManagerDataSource dataSource = new DriverManagerDataSource (); dataSource.setDriverClassName (driverClass) DataSource.setUrl (url); dataSource.setUsername (userName); dataSource.setPassword (passWord); return dataSource;} @ Bean (name = "twoSqlSessionFactory") public SqlSessionFactory sqlSessionFactory (@ Qualifier ("twoDataSource") DataSource dataSource) throws Exception {SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean (); sessionFactoryBean.setDataSource (dataSource) SessionFactoryBean.setMapperLocations (new PathMatchingResourcePatternResolver () .getResources ("classpath:mybatis/mapper-postgres/*.xml")); return sessionFactoryBean.getObject ();} @ Bean (name = "twoSqlSessionTemplate") public SqlSessionTemplate sqlSessionFactoryTemplate (@ Qualifier ("twoSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {return new SqlSessionTemplate (sqlSessionFactory);}} IV. Structure
Some people may not know the structure of the project. I put a class structure diagram below to make it clearer and easier to understand.
Note: the main difference from the previous project is that there is one more mapper package and one more xml package for mapper, and different database mapper can be put into different packages.
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