Spring boot+Mybatis连接多种数据库oracle，mysql，sqlserver
应用场景
根据业务我需求，根据不通数据库放入不同的数据，进行项目重构整合，重构到一种数据库中，因为数据库涉及的表多，数据量大，下面，我进行的操作是到处数据库中的表结构。具体演示用配置类配置三种数据库。
项目结构
POM依赖
ps：这里注意一下SQL server的驱动特别要注意jdk的版本，MySQL的驱动我用的是最新的，Oracle驱动maven上下载不上的必须手动去官网下载然后添加到maven的本地仓库。
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-web
2.1.4.RELEASE
org.springframework.boot
spring-boot-autoconfigure
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.0.1
org.springframework.boot
spring-boot-starter-test
test
com.alibaba
fastjson
1.1.41
com.alibaba
druid
1.1.16
ch.qos.logback
logback-core
1.2.3
org.projectlombok
lombok
mysql
mysql-connector-java
8.0.15
com.microsoft.sqlserver
mssql-jdbc
6.1.0.jre8
com.oracle
ojdbc14
10.2.0.1.0
配置文件如下
server.port=8989
#mysql
spring.datasource.mysql.url=jdbc:mysql://localhost:3306/xxx?useUnicode=true&useSSL=true
spring.datasource.mysql.driverclassname=com.mysql.cj.jdbc.Driver
spring.datasource.mysql.password=xxx
spring.datasource.mysql.username=xxxx
#sqlserver
spring.datasource.sqlserver.url=jdbc:sqlserver://localhost:1433;DatabaseName=xxxx
spring.datasource.sqlserver.driverclassname=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.datasource.sqlserver.username=xxxx
spring.datasource.sqlserver.password=xxxx
#oracle
spring.datasource.oracle.driverclassname=oracle.jdbc.driver.OracleDriver
spring.datasource.oracle.url=jdbc:oracle:thin:@localhost:1521:xe
spring.datasource.oracle.username=xxxx
spring.datasource.oracle.password=xxxx
我的DAO层是用mybatis 注解开发。
这都不是重点，重点是单个数据库操作要放到单独的一个包下，不然会报错
重点，看这儿！！！
1. 首先启动类把自动配置数据源关闭
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
public class TableApplication {
public static void main(String[] args) {
SpringApplication.run(TableApplication.class, args);
}
}
2.配置多种数据源，我用的是alibaba的Druid连接池，创建多种数据源的时候必须要有一个主数据源。用@Primary注解，下面有演示。
- MySQL
package com.nec.table.conf;
import com.alibaba.druid.pool.DruidDataSource;
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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.nec.table.dao.mysql", sqlSessionFactoryRef = "mysqlSqlSessionFactory")
@PropertySource({"classpath:application.properties"})
public class MysqlSqlSessionFactoryConfig {
//从配置文件中获取值
@Value("${spring.datasource.mysql.url}")
private String mysqlurl;
@Value("${spring.datasource.mysql.type}")
private String mysqldriverClassName;
@Value("${spring.datasource.mysql.username}")
private String mysqlusername;
@Value("${spring.datasource.mysql.password}")
private String mysqlpassword;
//创建数据源
@Bean(name = "mysqlDataSource")
public DataSource mysqlDataSource() {
DruidDataSource druidDataSource = new DruidDataSource();
druidDataSource.setDriverClassName(mysqldriverClassName);
druidDataSource.setUrl(mysqlurl);
druidDataSource.setUsername(mysqlusername);
druidDataSource.setPassword(mysqlpassword);
return druidDataSource;
}
//事务管理
@Bean("mysqlTransactionManager")
public DataSourceTransactionManager mysqlTransactionManager() {
DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager(mysqlDataSource());
return dataSourceTransactionManager;
}
@Bean(name = "mysqlSqlSessionFactory")
public SqlSessionFactory sqlSessionFactory1(@Qualifier("mysqlDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
return factoryBean.getObject();
}
}
2.SQL server 是主数据源，看操作！！
package com.nec.table.conf;
import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.PropertySource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.nec.table.dao.sqlserver", sqlSessionFactoryRef = "sqlserverSqlSessionFactory")
@PropertySource({"classpath:application.properties"})
public class SqlServerSqlSessionFactoryConfig {
@Value("${spring.datasource.sqlserver.url}")
private String sqlserverurl;
@Value("${spring.datasource.sqlserver.type}")
private String sqlserverdriverClassName;
@Value("${spring.datasource.sqlserver.username}")
private String sqlserverusername;
@Value("${spring.datasource.sqlserver.password}")
private String sqlserverpassword;
@Bean(name = "sqlserverDataSource")
@Primary
public DataSource sqlserverDataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setUsername(sqlserverusername);
dataSource.setPassword(sqlserverpassword);
dataSource.setUrl(sqlserverurl);
dataSource.setDriverClassName(sqlserverdriverClassName);
return dataSource;
}
@Bean("sqlServerTractional")
@Primary
public DataSourceTransactionManager sqlServerTractional() {
DataSourceTransactionManager transactionManager = new DataSourceTransactionManager(sqlserverDataSource());
return transactionManager;
}
@Bean(name = "sqlserverSqlSessionFactory")
@Primary
public SqlSessionFactory sqlSessionFactory3(@Qualifier("sqlserverDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
return factoryBean.getObject();
}
}
3.Oracle
package com.nec.table.conf;
import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.nec.table.dao.oracle", sqlSessionFactoryRef = "oracleSqlSessionFactory")
public class OracleSqlSessionFactoryConfig {
@Value("${spring.datasource.oracle.url}")
private String oracleurl;
@Value("${spring.datasource.oracle.type}")
private String oracledriverClassName;
@Value("${spring.datasource.oracle.username}")
private String oracleusername;
@Value("${spring.datasource.oracle.password}")
private String oraclepassword;
@Bean(name = "oracleDataSource")
public DataSource oracleDataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(oracledriverClassName);
dataSource.setUrl(oracleurl);
dataSource.setUsername(oracleusername);
dataSource.setPassword(oraclepassword);
return dataSource;
}
@Bean("oracleTransactionManager")
public DataSourceTransactionManager oracleTransactionManager() {
DataSourceTransactionManager manager = new DataSourceTransactionManager(oracleDataSource());
return manager;
}
@Bean(name = "oracleSqlSessionFactory")
public SqlSessionFactory sqlSessionFactory2(@Qualifier("oracleDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
return factoryBean.getObject();
}
}