前言
今天团队里一个刚毕业的新人,手里的一个任务是把项目改成多数据源的,弄了好久没弄出来,找我帮忙,我之前也没做过,所以记录一下踩过的坑。
编写数据源配置类
我这边用的是静态的多数据源配置
第一个数据源配置
- 注意,@Primary注解表明这是主库
- MybatisSqlSessionFactoryBean 不要用错,如果没加Mybatis,那么MybatisPlus的原生方法都会失效
- 要加分页的配置
package com.xxx.xxx.configuration;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
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;
@Configuration
@MapperScan(basePackages = "com.xxx.xxx.stats.mapper.xxx",sqlSessionFactoryRef = "sepdamSqlSessionFactory")
public class SepdamDataSourceConfig {
@Primary
@Bean(name = "sepdamDataSource")
@ConfigurationProperties("spring.datasource.sepdam")
public DataSource sepdamDataSource(){
return DataSourceBuilder.create().build();
}
@Bean(name = "sepdamSqlSessionFactory")
public SqlSessionFactory sqlSessionFactory(@Qualifier("sepdamDataSource") DataSource dataSource) throws Exception {
MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
sessionFactoryBean.setDataSource(dataSource);
sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/**/*.xml"));
Interceptor interceptor = new PageInterceptor();
Properties properties = new Properties();
//数据库
properties.setProperty("helperDialect", "mysql");
//是否将参数offset作为PageNum使用
properties.setProperty("offsetAsPageNum", "true");
//是否进行count查询
properties.setProperty("rowBoundsWithCount", "true");
//是否分页合理化
properties.setProperty("reasonable", "false");
interceptor.setProperties(properties);
sessionFactoryBean.setPlugins(new Interceptor[] {
interceptor});
return sessionFactoryBean.getObject();
}
}
第二个数据源配置类
- 注意:与第一个配置类相比,不能有@Primary注解,因为只能有一个主库
- 其他与第一个配置类一样即可,注意细节,mapper的位置,xml的位置,配置文件中数据源的名称等
package com.xxx.xxx.configuration;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.github.pagehelper.PageInterceptor;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
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.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
import java.util.Properties;
@Configuration
@MapperScan(basePackages = "com.xxx.xxx.stats.mapper.db2",sqlSessionFactoryRef = "db2SqlSessionFactory")
public class DataSource2Config {
@Bean(name = "db2DataSource")
@ConfigurationProperties("spring.datasource.sepdam2")
public DataSource db2DataSource(){
return DataSourceBuilder.create().build();
}
@Bean(name = "db2SqlSessionFactory")
public SqlSessionFactory sqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
sessionFactoryBean.setDataSource(dataSource);
sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/**/*.xml"));
Interceptor interceptor = new PageInterceptor();
Properties properties = new Properties();
//数据库
properties.setProperty("helperDialect", "mysql");
//是否将参数offset作为PageNum使用
properties.setProperty("offsetAsPageNum", "true");
//是否进行count查询
properties.setProperty("rowBoundsWithCount", "true");
//是否分页合理化
properties.setProperty("reasonable", "false");
interceptor.setProperties(properties);
sessionFactoryBean.setPlugins(new Interceptor[] {
interceptor});
return sessionFactoryBean.getObject();
}
}