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Java mysql詳細(xì)講解雙數(shù)據(jù)源配置使用

 更新時(shí)間：2022年06月30日 08:59:46   作者：念舊、sunshine  
在開(kāi)發(fā)過(guò)程中我們常常會(huì)用到兩個(gè)數(shù)據(jù)庫(kù)，一個(gè)數(shù)據(jù)用來(lái)實(shí)現(xiàn)一些常規(guī)的增刪改查，另外一個(gè)數(shù)據(jù)庫(kù)用來(lái)實(shí)時(shí)存數(shù)據(jù)。進(jìn)行數(shù)據(jù)的統(tǒng)計(jì)分析。可以讀寫(xiě)分離。可以更好的優(yōu)化和提高效率；或者兩個(gè)數(shù)據(jù)存在業(yè)務(wù)分離的時(shí)候也需要多個(gè)數(shù)據(jù)源來(lái)實(shí)現(xiàn)

使用方式

application.properties中數(shù)據(jù)庫(kù)配置

#數(shù)據(jù)庫(kù)配置
spring.datasource.db1.jdbc-url=jdbc:mysql://localhost:3306/gds?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&useSSL=false 
spring.datasource.db1.username=root
spring.datasource.db1.password=root
spring.datasource.db1.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.db2.jdbc-url=jdbc:mysql://localhost:3306/zkhx?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&useSSL=false
spring.datasource.db2.username=root
spring.datasource.db2.password=root
spring.datasource.db2.driver-class-name=com.mysql.cj.jdbc.Driver

config文件配置

1、配置 spring.datasource.db1

注：basePackages=“com.zkhx.dao.master”：prefix= “spring.datasource.db1”

綁定master目錄下使用的是數(shù)據(jù)庫(kù)db1 也就是gds

package com.zkhx.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.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 org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
@Configuration
// 配置mybatis的接口類(lèi)放的地方
@MapperScan(basePackages = "com.zkhx.dao.master", sqlSessionFactoryRef = "dbSqlSessionFactory")
public class DataSourceConfig {
    @Bean(name = "db")
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource.db1")
    public DataSource getDateSource1() {
        return DataSourceBuilder.create().build();
    }
    @Bean
    @ConfigurationProperties(prefix = "mybatis.configuration")
    public org.apache.ibatis.session.Configuration configuration() {
        return new org.apache.ibatis.session.Configuration();
    }
    @Bean(name = "dbSqlSessionFactory")
    @Primary
    public SqlSessionFactory test1SqlSessionFactory(@Qualifier("db") DataSource datasource, org.apache.ibatis.session.Configuration configuration)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setConfiguration(configuration);
        bean.setMapperLocations(
                // 設(shè)置mybatis的xml所在位置
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/master/*.xml"));
        return bean.getObject();
    }
    @Bean("dbSqlSessionTemplate")
    // 表示這個(gè)數(shù)據(jù)源是默認(rèn)數(shù)據(jù)源
    @Primary
    public SqlSessionTemplate test1sqlsessiontemplate(
            @Qualifier("dbSqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

2、配置 spring.datasource.db2

package com.zkhx.config;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
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.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.zkhx.dao.vice", sqlSessionFactoryRef = "db2SqlSessionFactory")
public class DataSourceViceConfig {
    @Bean(name = "db2")
    @ConfigurationProperties(prefix = "spring.datasource.db2")
    public DataSource getDateSource2() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "db2SqlSessionFactory")
    public SqlSessionFactory test2SqlSessionFactory(@Qualifier("db2") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/vice/*.xml"));
        return bean.getObject();
    }
    @Bean("db2SqlSessionTemplate")
    public SqlSessionTemplate test2sqlsessiontemplate(
            @Qualifier("db2SqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

3、截圖

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zkhx.dao.vice.StDBDataDao">
</mapper>

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