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前言：

小伙伴說能不能用springboot整合一下mybatis多數(shù)據(jù)源不使用JPA進(jìn)行數(shù)據(jù)庫連接操作。那么說干就干

1 創(chuàng)建一個(gè)springboot項(xiàng)目

流程就不介紹了，按圖操作即可

springboot 中整合mybatis多數(shù)據(jù)源不使用JPA

創(chuàng)建項(xiàng)目后可能會發(fā)現(xiàn)，這個(gè)項(xiàng)目展示的有些不對勁啊，java類前面還有個(gè)小J號，這是由于maven包還沒有下載成功，你只需

要去maven projects中重新加載一下就可以了。？maven project在哪。?？聪聢D

springboot 中整合mybatis多數(shù)據(jù)源不使用JPA

項(xiàng)目創(chuàng)建成功了，那么開始說下整合mybatis

首先在我們的resources目錄下存在一個(gè)application.properties文件，這是一個(gè)全局配置文件，先將兩個(gè)數(shù)據(jù)源配置添加到這個(gè)文件中（如果你分環(huán)境了可以將數(shù)據(jù)源配置放在不同的目錄下）

//數(shù)據(jù)源1
spring.datasource.druid.crmtest.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.druid.crmtest.url=jdbc:mysql://xxxxx:3306/crm
spring.datasource.druid.crmtest.username=xxx
spring.datasource.druid.crmtest.password=xxx
spring.datasource.druid.crmtest.initial-size=2
spring.datasource.druid.crmtest.max-active=10
spring.datasource.druid.crmtest.min-idle=2
spring.datasource.druid.crmtest.max-wait=30000
spring.datasource.druid.crmtest.validation-query=SELECT 1
spring.datasource.druid.crmtest.validation-query-timeout=30000
spring.datasource.druid.crmtest.min-evictable-idle-time-millis=300000
spring.datasource.druid.crmtest.pool-prepared-statements=true
spring.datasource.druid.crmtest.max-pool-prepared-statement-per-connection-size=20
spring.datasource.druid.crmtest.test-on-borrow=false
spring.datasource.druid.crmtest.test-on-return=false
spring.datasource.druid.crmtest.test-while-idle=true
spring.datasource.druid.crmtest.time-between-eviction-runs-millis=60000
spring.datasource.druid.crmtest.filters=stat,wall
spring.datasource.druid.crmtest.connection-properties=druid.stat.slowSqlMillis=5000
spring.datasource.druid.crmtest.connection-init-sqls=set names utf8mb4;
#數(shù)據(jù)源2
spring.datasource.druid.paytest.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.druid.paytest.url=jdbc:mysql://xxxxxxx:3306/pay
spring.datasource.druid.paytest.username=xxxx
spring.datasource.druid.paytest.password=xxxxxx
spring.datasource.druid.paytest.initial-size=2
spring.datasource.druid.paytest.max-active=10
spring.datasource.druid.paytest.min-idle=2
spring.datasource.druid.paytest.max-wait=30000
spring.datasource.druid.paytest.validation-query=SELECT 1
spring.datasource.druid.paytest.validation-query-timeout=30000
spring.datasource.druid.paytest.min-evictable-idle-time-millis=300000
spring.datasource.druid.paytest.pool-prepared-statements=true
spring.datasource.druid.paytest.max-pool-prepared-statement-per-connection-size=20
spring.datasource.druid.paytest.test-on-borrow=false
spring.datasource.druid.paytest.test-on-return=false
spring.datasource.druid.paytest.test-while-idle=true
spring.datasource.druid.paytest.time-between-eviction-runs-millis=60000
spring.datasource.druid.paytest.filters=stat,wall
spring.datasource.druid.paytest.connection-properties=druid.stat.slowSqlMillis=5000
spring.datasource.druid.paytest.connection-init-sqls=set names utf8mb4;

創(chuàng)建DataSourceConfig

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.github.pagehelper.PageInterceptor;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.*;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.sql.DataSource;
import java.util.Properties;
/**
 * @Auther: lqf
 * @Date: 2018/5/22
 * @Description:
 */
@Configuration
@EnableTransactionManagement
public class DevDataSourceConfig {
    //數(shù)據(jù)源1   在springboot中做多中配置的時(shí)候需要 @Primary否則會報(bào)錯，springboot需要知道主配置是什么
    @Primary
    @Bean("crmds")
    @ConfigurationProperties("spring.datasource.druid.crmtest")
    public DataSource crmDataSource() {
        return DruidDataSourceBuilder.create().build();
    }
    //數(shù)據(jù)源2 @ConfigurationProperties("spring.datasource.druid.paytest")這個(gè)配置會自動引入你在配置文件中的配置
    @Bean("payds")
    @ConfigurationProperties("spring.datasource.druid.paytest")
    public DataSource payDataSource() {
        return DruidDataSourceBuilder.create().build();
    }
}

上面是一個(gè)總的配置將不同的數(shù)據(jù)源都配置在了這一個(gè)configuration中。下面我們來建立單獨(dú)的數(shù)據(jù)源配置（這里需要注意一點(diǎn)我們看上面引用的是druid，那么我們需要在pom文件中導(dǎo)入alibaba.druid包，在文章的最后面我會給大家展示一下pom文件）

數(shù)據(jù)源1

package com.mysql.test.demo.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.BeansException;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
/**
 * @Auther: lqf
 * @Date: 2018/5/23
 * @Description:
 */
@Configuration
@MapperScan(basePackages = {"com.mysql.test.demo.dao.crm"}, sqlSessionTemplateRef = "crmSqlSessionTemplate")
public class CrmMysqlConfig implements ApplicationContextAware {
    private ApplicationContext ctx;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.ctx = applicationContext;
    }
    @Bean("crmSqlSessionFactory")
    public SqlSessionFactoryBean crmSqlSessionFactory(@Qualifier("crmds") DataSource crmDataSource) throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(crmDataSource);
        factoryBean.setTypeAliasesPackage("com.mysql.test.demo.entity.crm");
        Resource[] resources = ctx.getResources("classpath*:/mapper/crm/*.xml");
        factoryBean.setMapperLocations(resources);
        return factoryBean;
    }
    @Bean("crmSqlSessionTemplate")
    public SqlSessionTemplate crmSqlSessionTemplate(@Qualifier("crmSqlSessionFactory") SqlSessionFactory
                                                            sqlSessionFactory) {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
    @Bean("crmTxManager")
    public DataSourceTransactionManager crmTxManager(@Qualifier("crmds") DataSource crmDataSource) {
        return new DataSourceTransactionManager(crmDataSource);
    }
}

上面的配置可以直接使用

路徑需要更換成你的項(xiàng)目路徑這里就不多說了，注重提下注解的含義吧。

@Configuration ：用于定義配置類，可替換xml配置文件，被注解的類內(nèi)部包含有一個(gè)或多個(gè)被@Bean注解的方法，這些方法將會被AnnotationConfigApplicationContext或AnnotationConfigWebApplicationContext類進(jìn)行掃描，并用于構(gòu)建bean定義，初始化Spring容器
@MapperScan(）：指定要掃描的Mapper類的包的路徑，sqlSessionTemplateRef ：SqlSessionTemplate實(shí)現(xiàn)了SqlSession，這就是說要對MyBatis的SqlSession進(jìn)行簡易替換。SqlSessionTemplate通常是被用來替代默認(rèn)的MyBatis實(shí)現(xiàn)的DefaultSqlSession，因?yàn)樗荒軈⑴c到Spring的事務(wù)中也不能被注入，因?yàn)樗蔷€程不安全的。相同應(yīng)用程序中兩個(gè)類之間的轉(zhuǎn)換可能會引起數(shù)據(jù)一致性的問題
@Qualifier：我的理解就是告訴指定具體引用那個(gè)bean，參考：//www.yisu.com/article/220973.htm

數(shù)據(jù)源2

package com.mysql.test.demo.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.BeansException;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
/**
 * @Auther: lqf
 * @Date: 2018/5/23
 * @Description:
 */
@Configuration
@MapperScan(basePackages = {"com.mysql.test.demo.dao.pay"}, sqlSessionTemplateRef = "paySqlSessionTemplate")
public class PayMysqlConfig implements ApplicationContextAware {
    private ApplicationContext ctx;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.ctx = applicationContext;
    }
    @Bean("paySqlSessionFactory")
    public SqlSessionFactoryBean crmSqlSessionFactory(@Qualifier("payds") DataSource payDataSource) throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(payDataSource);
        factoryBean.setTypeAliasesPackage("com.mysql.test.demo.entity.pay");
        Resource[] resources = ctx.getResources("classpath*:/mapper/pay/*.xml");
        factoryBean.setMapperLocations(resources);
        return factoryBean;
    }
    @Bean("paySqlSessionTemplate")
    public SqlSessionTemplate crmSqlSessionTemplate(@Qualifier("paySqlSessionFactory") SqlSessionFactory
                                                            sqlSessionFactory) {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
    @Bean("payTxManager")
    public DataSourceTransactionManager crmTxManager(@Qualifier("payds") DataSource crmDataSource) {
        return new DataSourceTransactionManager(crmDataSource);
    }
}

在pom文件中添加generator-maven插件讓我們來測試一下（文章最后展示全部pom文件）

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <configuration>
                    <configurationFile>./src/main/resources/generatorConfig.xml</configurationFile>
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
                <dependencies>
                    <!-- 數(shù)據(jù)庫驅(qū)動 -->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>${mysql.version}</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
        <finalName>agentapi</finalName>
    </build>

創(chuàng)建generatorConfig.properties文件放在resources目錄下

//數(shù)據(jù)庫連接路徑
mysql.jdbc.connectionURL=jdbc:mysql://xxxxxx:3306/crm?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull
mysql.jdbc.userId=xxx
mysql.jdbc.password=xxx
//自動生成實(shí)體類路徑包名
module.targetPackage=com.mysql.test.demo.entity.crm
//生成實(shí)體類路徑位置
module.targetProject=src/main/java
//生成mapper.xml位置和包名
map.targetPackage=mapper
map.targetProject=src/main/resources
//生成DAO的包名和位置
client.targetPackage=com.mysql.test.demo.dao.crm
client.targetProject=src/main/java

創(chuàng)建generatorConfig.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <properties resource="generatorConfig.properties"/>
    <context id="bTables" targetRuntime="MyBatis3">
        <plugin type="org.mybatis.generator.plugins.RowBoundsPlugin"></plugin>
        <plugin type="org.mybatis.generator.plugins.CaseInsensitiveLikePlugin"></plugin>
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin"></plugin>
        <plugin type="org.mybatis.generator.plugins.EqualsHashCodePlugin"></plugin>
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自動生成的注釋 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--數(shù)據(jù)庫鏈接URL，用戶名、密碼 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="${mysql.jdbc.connectionURL}" userId="${mysql.jdbc.userId}"
                        password="${mysql.jdbc.password}">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置 -->
        <javaModelGenerator targetPackage="${module.targetPackage}"
                            targetProject="${module.targetProject}">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置 -->
        <sqlMapGenerator targetPackage="${map.targetPackage}"
                         targetProject="${map.targetProject}">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置 -->
        <javaClientGenerator
                type="XMLMAPPER"
                targetPackage="${client.targetPackage}" targetProject="${client.targetProject}">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!--<table tableName="order_history_tab" domainObjectName="OrderHistoryTab" mapperName="OrderHistoryTabMapper">-->
            <!--<generatedKey column="id" sqlStatement="JDBC"/>-->
        <!--</table>-->
        //你要生成的表
        <table tableName="fy_advertisement" domainObjectName="FyAdvertisement" mapperName="FyAdvertisementMapper">
            <generatedKey column="id" sqlStatement="JDBC"/>
        </table>
    </context>
</generatorConfiguration>

如果上面的配置都完成的話那么我們來自動生成一下

springboot 中整合mybatis多數(shù)據(jù)源不使用JPA

如上圖打開maven projects如上圖進(jìn)行操作就可自動生成需要的mapper 實(shí)體 dao等信息。上圖是生成了一個(gè)數(shù)據(jù)源的那么我們來生成第二個(gè)數(shù)據(jù)源中的表操作如上圖，需要改變第二個(gè)數(shù)據(jù)源的位置信息等。（重復(fù)的事情就不做了和上面生成一樣的道理，只是改些路徑和對應(yīng)的表名）