How to configure two data sources in springboot project

The content of this article is about the method of configuring two data sources in the springboot project. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

This article mainly introduces how to configure two data sources (mysql and oracle) in a springboot project;

1. Introducing related dependencies

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>
<!--oracle 驱动 -->
<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>ojdbc6</artifactId>
    <version>11.1.0.7.0</version>
</dependency>

When the ojdbc driver package version is too low, an error will be reported as shown below, that is, the driver jar is incompatible with the database version:

##2. Configure data source connection parameters in applicationContext.yml:

Spring:
        datasource:
            base:
                 driver-class-name: com.mysql.jdbc.Driver
                 jdbc-url: ${base.db.url}
                 username: ${base.db.username}
                 password: ${base.db.password}
            oa:
                 driver-class-name: oracle.jdbc.driver.OracleDriver
                 jdbc-url: ${oa.db.urL}
                 username: ${oa.db.username}
                 password: ${oa.db.password}
            hikari:
                 max-lifetime: 60000
                 login-timeout: 5
                 validation-timeout: 3000
                 connection-timeout: 60000
                 idle-timeout: 60000

3. Multiple data source configuration files, read the corresponding connection parameters

Package com.**.config;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;

public class MultiDataSourceConfig {

    @Bean (name = "primaryDataSource")
    @Qualifier("primaryDataSource")
    @Primary //定义主数据源
    @ConfigurationProperties (prefix = "spring.datasource.Base")
    public DataSource primaryDataSource () { return DataSourceBuilder.create().build (); }

    @Bean (name = "secondaryDataSource")
    @Qualifier ("secondaryDataSource")
    @ConfigurationProperties (prefix = "spring.datasource.oa")
    public DataSource secondaryDataSource () { return DataSourceBuilder.create().build (); }

}

3. Main data source configuration, specify scanning of the corresponding mapper file and the corresponding xml file. When using the mapper file under the mapper package, the corresponding sql session will be automatically used

Package com.**.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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframeworkcore.io.support.PathMatchingResourcePatternResolver;
import org.spr ingframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import javax.sql.DataSource;

@Configuration
@MapperScan (basePackages = "com.**.mapper", sqlSessionTemplateRef = "primarySqlSessionTemplate")
public class SqlSessionTemplate1 {

    @Bean (name = "primarySqlSessionFactory")
    @Primary
    public SqlSessionFactory primarySqlSessionFactory  (@Qualifier("primaryDataSource") DataSource dataSource)
            throws Exception{
        SqLSessionFactoryBean bean = new SqlSessionFactoryBean ();
        bean.setDataSource (dataSource);
        bean.setMapperLocations (new PathMatchingResourcePatternResolver().getResources (locationPattern: "classpath: mybatis/mapper/*. XmL"));
        return bean.getObject();
    }

    /**
     * 配置声明式事务管理器
     */
    @Bean (name = "primaryTransactionManager")
    @Primary
    public PlatformTransactionManager primaryTransactionManager  (@Qualifier("primaryDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager  (dataSource);
    }

    @Bean (name = "primarySqlSessionTemplate")
    @Primary
    public SqlSessionTemplatel primarySqlSessionTemplate(@Qualifier("primarySqlSesionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplatel(sqlSessionFactory);
    }
}

4. Second data source configuration, specify to scan the corresponding mapper file and the corresponding xml file. When using the mapper file under the mapper package, the corresponding sql session will be automatically used

Package com.**.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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.secondary;
import org.springframeworkcore.io.support.PathMatchingResourcePatternResolver;
import org.spr ingframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan (basePackages = "com.**.oraclemapper", sqlSessionTemplateRef = "secondarySqlSessionTemplate")
public class SqlSessionTemplate2 {
    @Bean (name = "secondarySqlSessionFactory")
    public SqlSessionFactory secondarySqlSessionFactory  (@Qualifier("secondaryDataSource") DataSource dataSource)
            throws Exception{
        SqLSessionFactoryBean bean = new SqlSessionFactoryBean ();
        bean.setDataSource (dataSource);
        bean.setMapperLocations (new PathMatchingResourcePatternResolver().getResources (locationPattern: "classpath: mybatis/oraclemapper/*. XmL"));
        return bean.getObject();
    }

    /**
     * 配置声明式事务管理器
     */
    @Bean (name = "secondaryTransactionManager")
    public PlatformTransactionManager secondaryTransactionManager  (@Qualifier("secondaryDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager  (dataSource);
    }

    @Bean (name = "secondarySqlSessionTemplate")
    public SqlSessionTemplatel secondarySqlSessionTemplate(@Qualifier("secondarySqlSesionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplatel(sqlSessionFactory);
    }
}

At this point, the service layer can be used like a single data source.

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