springboot 整合 mybatis 多数据源配置

Posted 2020-10-15 草木不语

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一、mysql的多数据源的配置

1. 项目结构

包名	说明
com.kk.configuration	数据库配置层
com.kk.testcss.controller	控制层
com.kk.testcss.dao	数据库操作层，又分了不同的两个包，分别操作数据源1 和数据源2
com.kk.testcss.service	业务逻辑层
com.kk.model	实体类
com.kk.Application	启动类

2.数据库配置

springboot 主配置文件 application.properties 文件添加数据库的基本信息

#数据源1
network.datasource.url=jdbc:mysql://127.0.0.1:3306/db2?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&useSSL=false
network.datasource.username=root
network.datasource.password=root
network.datasource.driverClassName=com.mysql.jdbc.Driver

#数据源2
message.datasource.url=jdbc:mysql://127.0.0.1:3306/db2?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&useSSL=false
message.datasource.username=root
message.datasource.password=root
message.datasource.driverClassName=com.mysql.jdbc.Driver

3. 需要导入的依赖

pom.xml 文件如下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.kk</groupId>
	<artifactId>csstestdemo1</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>csstestdemo1</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.8.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.0</version>
		</dependency>
		<!-- Druid 数据连接池依赖  不能支持sqlserver 2000-->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.25</version>
		</dependency>

		<!--sql server 2000 依赖-->
		<dependency>
			<groupId>com.microsoft</groupId>
			<artifactId>sql-server</artifactId>
			<version>1.0.0</version>
			<scope>system</scope>
			<systemPath>${project.basedir}/src/main/resources/lib/mssqlserver2.jar</systemPath>
		</dependency>

		<!--freemarker前端页面模板依赖-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-freemarker</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

4. 项目结构

5. 多数据源配置

编写数据源1的配置类

package com.kk.configuration;
import com.kk.testcss.utils.InitialDatabase;
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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = com.kk.configuration.NetworkConfig.PACKAGE, sqlSessionFactoryRef = "NetworkSqlSessionFactory")
public class NetworkConfig {
    static final String PACKAGE = "com.kk.testcss.dao.network";
    static final String MAPPER_LOCATION = "classpath:mapper/network/*.xml";

    @Value("${network.datasource.driverClassName}")
    private String driverClass;

    @Value("${network.datasource.url}")
    private String url;

    @Value("${network.datasource.username}")
    private String user;

    @Value("${network.datasource.password}")
    private String password;

    @Bean(name = "NetworkDataSource")
    @Primary
    public DataSource NetworkDataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(user);
        dataSource.setPassword(password);
        return dataSource;
    }

    @Bean(name = "NetworkTransactionManager")
    @Primary
    public DataSourceTransactionManager NetworkTransactionManager() {
        return new DataSourceTransactionManager(NetworkDataSource());
    }

    @Bean(name = "NetworkSqlSessionFactory")
    @Primary
    public SqlSessionFactory NetworkSqlSessionFactory(@Qualifier("NetworkDataSource") DataSource NetworkDataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(NetworkDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(com.kk.configuration.NetworkConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

编写数据源2的配置类

package com.kk.configuration;

import com.microsoft.jdbcx.sqlserver.SQLServerDataSource;
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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = com.kk.configuration.MessageConfig.PACKAGE, sqlSessionFactoryRef = "MessageSqlSessionFactory")
public class MessageConfig {
    static final String PACKAGE = "com.kk.testcss.dao.message";
    static final String MAPPER_LOCATION = "classpath:mapper/message/*.xml";

    @Value("${message.datasource.driverClassName}")
    private String driverClass;

    @Value("${message.datasource.url}")
    private String url;

    @Value("${message.datasource.username}")
    private String user;

    @Value("${message.datasource.password}")
    private String password;

    @Bean(name = "MessageDataSource")
    @Primary
    public DataSource NetworkDataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(user);
        dataSource.setPassword(password);
        return dataSource;
    }

    @Bean(name = "MessageTransactionManager")
    public DataSourceTransactionManager MessageTransactionManager() {
        return new DataSourceTransactionManager(MessageDataSource());
    }

    @Bean(name = "MessageSqlSessionFactory")
    public SqlSessionFactory MessageSqlSessionFactory(@Qualifier("MessageDataSource") DataSource MessageDataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(MessageDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(com.kk.configuration.MessageConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

@Primary 标志这个 Bean 如果在多个同类 Bean 候选时，该 Bean 优先被考虑。「多数据源配置的时候注意，必须要有一个主数据源，用 @Primary 标志该 Bean」
@MapperScan 扫描 Mapper 接口并容器管理
@Value 获取全局配置文件 application.properties 的 kv 配置,并自动装配
sqlSessionFactoryRef 表示定义了 key ，表示一个唯一 SqlSessionFactory 实例

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