今天就跟大家聊聊有关springboot 中怎么利用mybatis 配置多数据源，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
一、项目启动成功后创建bean的方式
pom.xml
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!-- maven仓库中没有oracle数据库驱动，这里将jar 放到工程下进行引入 -->
<dependency>
<groupId>com.ojdbc</groupId>
<artifactId>ojdbc</artifactId>
<version>10.2.0.1</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/lib/ojdbc14-10.2.0.1.0.jar</systemPath>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>application.properties
#oracle数据库
spring.datasource.master.url=jdbc:oracle:thin:@localhost:1521:test
spring.datasource.master.username=oracle
spring.datasource.master.password=123456
spring.datasource.master.driverClassName=oracle.jdbc.OracleDriver
spring.datasource.master.initialSize=5
spring.datasource.master.maxActive=15
spring.datasource.master.minIdle=5
spring.datasource.master.poolPreparedStatements=true
spring.datasource.master.validationQuery=SELECT 1 FROM DUAL
#配置执行多条sql比如：批量处理
#对应的错误：sql injection violation, multi-statement not allow
spring.datasource.master.wall.multiStatementAllow=true
#配置执行特殊sql比如sql server的创建临时表（declare）语句
#对应的错误：sql injection violation, class com.alibaba.druid.sql.ast.statement.SQLDeclareStatement not allow
spring.datasource.master.wall.noneBaseStatementAllow=true
#mysql数据库
spring.datasource.slave.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8
spring.datasource.slave.username=mysql
spring.datasource.slave.password=123456
spring.datasource.slave.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.slave.initialSize=5
spring.datasource.slave.maxActive=15
spring.datasource.slave.minIdle=5
spring.datasource.slave.poolPreparedStatements=true
spring.datasource.slave.validationQuery=SELECT 1
#配置执行多条sql比如：批量处理
#对应的错误：sql injection violation, multi-statement not allow
spring.datasource.master.wall.multiStatementAllow=true
#配置执行特殊sql比如sql server的创建临时表（declare）语句
#对应的错误：sql injection violation, class com.alibaba.druid.sql.ast.statement.SQLDeclareStatement not allow
spring.datasource.master.wall.noneBaseStatementAllow=true
MasterDataSourceConfig.java
注：Primary注解代表该数据源为主数据源
package com.core.dataSource;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
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.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.DataSourceTransactionManager;
import javax.sql.DataSource;
/**
* oracle数据配置
*/
@Configuration
//配置mapper文件目录，进行扫描
@MapperScan(basePackages = "com.wawj.core.mapper.master", sqlSessionTemplateRef = "masterSqlSessionTemplate")
public class MasterDataSourceConfig {
/**
* 创建数据源
* @return
*/
@Bean
@Primary
@ConfigurationProperties(prefix = "spring.datasource.master")
public DataSource masterDataSource() {
return DruidDataSourceBuilder.create().build();
}
/**
* 创建工厂
* @param dataSource
* @return
* @throws Exception
*/
@Bean
@Primary
public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
//指定mapper.xml的目录
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/master/**/*.xml"));
//指定实体类目录
bean.setTypeAliasesPackage("com.wawj.core.entity");
return bean.getObject();
}
/**
* 创建事务
* @param dataSource
* @return
*/
@Bean
@Primary
public DataSourceTransactionManager masterTransactionManager(@Qualifier("masterDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
/**
* 创建模板
* @param sqlSessionFactory
* @return
*/
@Bean
@Primary
public SqlSessionTemplate masterSqlSessionTemplate(@Qualifier("masterSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}SlaveDataSourceConfig.java
package com.core.dataSource;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
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.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.DataSourceTransactionManager;
import javax.sql.DataSource;
/**
* mysql数据配置
*/
@Configuration
//配置mapper文件目录，进行扫描
@MapperScan(basePackages = "com.wawj.core.mapper.slave", sqlSessionTemplateRef = "slaveSqlSessionTemplate")
public class SlaveDataSourceConfig {
/**
* 创建数据源
* @return
*/
@Bean
@ConfigurationProperties(prefix = "spring.datasource.slave")
public DataSource slaveDataSource() {
return DruidDataSourceBuilder.create().build();
}
/**
* 创建工厂
* @param dataSource
* @return
* @throws Exception
*/
@Bean
public SqlSessionFactory slaveSqlSessionFactory(@Qualifier("slaveDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
//指定mapper.xml的目录
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/slave/**/*.xml"));
//指定实体类目录
bean.setTypeAliasesPackage("com.wawj.core.entity");
return bean.getObject();
}
/**
* 创建事务
* @param dataSource
* @return
*/
@Bean
public DataSourceTransactionManager slaveTransactionManager(@Qualifier("slaveDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
/**
* 创建模板
* @param sqlSessionFactory
* @return
*/
@Bean
public SqlSessionTemplate slaveSqlSessionTemplate(@Qualifier("slaveSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}这种方式初始化的是时候在druid控制台（http://localhost:8080/druid/login.html）中的数据源标签是没有，要请求过后才会显示当前连接的数据源
二、使用dynamic-datasource 动态配置（项目启动的时候创建）
pom.xml
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>2.5.6</version>
</dependency>
<!-- maven仓库中没有oracle数据库驱动，这里将jar 放到工程下进行引入 -->
<dependency>
<groupId>com.ojdbc</groupId>
<artifactId>ojdbc</artifactId>
<version>10.2.0.1</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/lib/ojdbc14-10.2.0.1.0.jar</systemPath>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>application.properties
#全局默认值，可以全局更改
spring.datasource.dynamic.druid.initial-size=5
spring.datasource.dynamic.druid.max-active=5
spring.datasource.dynamic.druid.min-idle=5
spring.datasource.dynamic.druid.pool-prepared-statements=true
#配置执行多条sql比如：批量处理
#对应的错误：sql injection violation, multi-statement not allow
spring.datasource.dynamic.druid.wall.multi-statement-allow=true
#配置执行特殊sql比如sql server的创建临时表（declare）语句
#对应的错误：sql injection violation, class com.alibaba.druid.sql.ast.statement.SQLDeclareStatement not allow
spring.datasource.dynamic.druid.wall.none-base-statement-allow=true
#oracle数据库
spring.datasource.dynamic.datasource.master.driver-class-name=oracle.jdbc.OracleDriver
spring.datasource.dynamic.datasource.master.druid.validation-query=SELECT 1 FROM DUAL
spring.datasource.dynamic.datasource.master.url=jdbc:oracle:thin:@localhost:1521:test
spring.datasource.dynamic.datasource.master.username=oracle
spring.datasource.dynamic.datasource.master.password=123456
#mysql数据库
spring.datasource.dynamic.datasource.slave.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.dynamic.datasource.slave.druid.validation-query=SELECT 1
spring.datasource.dynamic.datasource.slave.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8
spring.datasource.dynamic.datasource.slave.username=mysql
spring.datasource.dynamic.datasource.slave.password=123456
#指定master为主数据源
spring.datasource.dynamic.primary=master
#排除原生Druid的快速配置类（DruidDataSourceAutoConfigure会注入一个DataSourceWrapper，其会在原生的spring.datasource下找url,username,password等。而我们动态数据源的配置路径是变化的。）
spring.autoconfigure.exclude=com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
#设置dynamic登录名
spring.datasource.druid.stat-view-servlet.login-username=admin
#设置dynamic密码
spring.datasource.druid.stat-view-servlet.login-password=admin
#mybatis mapper location
mybatis-plus.mapper-locations=classpath:mapper/**/*.xml
mybatis-plus.type-aliases-package=com.wawj.core.entity
这种方式使用注解（@DS("数据源名称")）切换数据源
@DS 可以注解在方法上和类上，同时存在方法注解优先于类上注解。
注解在service实现或mapper接口方法上，但强烈不建议同时在service和mapper注解。 (可能会有问题)
| 注解 | 结果 |
|---|
| 没有@DS | 默认数据源 |
| @DS("dsName") | dsName可以为组名也可以为具体某个库的名称 |
补充：排除原生的DruidDataSourceAutoConfigure也可以在springboot启动类排除（某些springBoot的版本上面可能无法排除就在application.properties中配置排除）
@SpringBootApplication(exclude = DruidDataSourceAutoConfigure.class)
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
或
#application.properties
spring.autoconfigure.exclude=com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure看完上述内容，你们对springboot 中怎么利用mybatis 配置多数据源有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注天达云行业资讯频道，感谢大家的支持。