9、SpringBoot-mybatis-druid多源数据多源数据

系列导航

完结

当一个mybatis工程中想操作多个数据库的时候就需要配置多数据源的工程，这里分享一个例子

1数据库中创建表

zy数据库：

CREATE TABLE TEST_BLOCK_T

(

  BLOCK_ID         VARCHAR2(10 BYTE) PRIMARY   KEY,    --编码

  BLOCK_NAME       VARCHAR2(200 BYTE)                    --资源名称

);

 Insert into TEST_BLOCK_T (BLOCK_ID, BLOCK_NAME) Values ('1', 'java');

COMMIT;

yc数据库：

CREATE TABLE TEST_USER_T

(

  USER_ID         VARCHAR2(10 BYTE) PRIMARY   KEY,

  NAME            VARCHAR2(200 BYTE)

);

Insert into TEST_USER_T (USER_ID, NAME) Values ('1', '张三');

COMMIT;

2、pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>

    <artifactId>demo</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>demo</name>

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

    <properties>

        <java.version>1.8</java.version>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <spring-boot.version>2.1.17.RELEASE</spring-boot.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <!-- oracle驱动 -->

        <dependency>

            <groupId>com.oracle</groupId>

            <artifactId>ojdbc6</artifactId>

            <version>11.2.0.3</version>

        </dependency>

        <!-- 集成druid -->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>druid-spring-boot-starter</artifactId>

            <version>1.1.10</version>

        </dependency>

        <!-- 集成mybatis -->

        <dependency>

            <groupId>org.mybatis.spring.boot</groupId>

            <artifactId>mybatis-spring-boot-starter</artifactId>

            <version>1.3.2</version>

        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-dependencies</artifactId>

                <version>${spring-boot.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <version>3.8.1</version>

                <configuration>

                    <source>1.8</source>

                    <target>1.8</target>

                    <encoding>UTF-8</encoding>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <version>2.1.17.RELEASE</version>

                <configuration>

                    <mainClass>com.example.demo.DemoApplication</mainClass>

                </configuration>

                <executions>

                    <execution>

                        <id>repackage</id>

                        <goals>

                            <goal>repackage</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

</project>

3、 application.properties配置

# 应用名称

spring.application.name=demo

# 应用服务 WEB 访问端口

server.port=8080

# druid配置

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

#mybatis-plus控制台打印sql

mybatis-plus.configuration.log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

zy.datasource.username=zy

zy.datasource.password=1

zy.datasource.url=jdbc:oracle:thin:@192.168.0.100:1521:orcl

zy.datasource.driver-class-name=oracle.jdbc.OracleDriver

yc.datasource.username=yc

yc.datasource.password=1

yc.datasource.url=jdbc:oracle:thin:@192.168.0.100:1521:orcl

yc.datasource.driver-class-name=oracle.jdbc.OracleDriver

4、文件目录

5、源码

启动类

package com.example.demo;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class DemoApplication {

    public static void main(String[] args) {

        SpringApplication.run(DemoApplication.class, args);

    }

}

数据源yc配置类

这里注意指定扫描mapper和xml文件的路径

package com.example.demo.config;

import com.alibaba.druid.pool.DruidDataSource;

import javax.sql.DataSource;

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;

@Configuration

@MapperScan(basePackages = YcDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "ycSqlSessionFactory")

public class YcDataSourceConfig {

    /**

     * 配置多数据源 关键就在这里 这里配置了不同的数据源扫描不同mapper

     */

    static final String PACKAGE = "com.example.demo.mapper.yc";

    static final String MAPPER_LOCATION = "classpath:mybatis/yc/mapper/*.xml";

    /**

     * 连接数据库信息 这个其实更好的是用配置中心完成

     */

    @Value("${yc.datasource.url}")

    private String url;

    @Value("${yc.datasource.username}")

    private String username;

    @Value("${yc.datasource.password}")

    private String password;

    @Value("${yc.datasource.driver-class-name}")

    private String driverClassName;

    @Bean("ycDataSource")

    public DataSource ycDataSource(){

        DruidDataSource dataSource = new DruidDataSource();

        dataSource.setUrl(url);

        dataSource.setUsername(username);

        dataSource.setPassword(password);

        dataSource.setDriverClassName(driverClassName);

        return dataSource;

    }

    @Bean(name = "ycTransactionManager")

    public DataSourceTransactionManager ycTransactionManager() {

        return new DataSourceTransactionManager(ycDataSource());

    }

    @Bean(name = "ycSqlSessionFactory")

    public SqlSessionFactory ycSqlSessionFactory(@Qualifier("ycDataSource") DataSource ycDataSource)

            throws Exception {

        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();

        sessionFactory.setDataSource(ycDataSource);

        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(YcDataSourceConfig.MAPPER_LOCATION));

        return sessionFactory.getObject();

    }

}

数据源zy配置类

这里注意指定扫描mapper和xml文件的路径

package com.example.demo.config;

import com.alibaba.druid.pool.DruidDataSource;

import com.alibaba.druid.support.http.StatViewServlet;

import javax.sql.DataSource;

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.boot.web.servlet.ServletRegistrationBean;

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;

@Configuration

@MapperScan(basePackages = ZyDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "zySqlSessionFactory")

public class ZyDataSourceConfig {

    /**

     * 配置多数据源 关键就在这里 这里配置了不同的数据源扫描不同mapper

     */

    static final String PACKAGE = "com.example.demo.mapper.zy";

    static final String MAPPER_LOCATION = "classpath:mybatis/zy/mapper/*.xml";

    /**

     * 连接数据库信息 这个其实更好的是用配置中心完成

     */

    @Value("${zy.datasource.url}")

    private String url;

    @Value("${zy.datasource.username}")

    private String username;

    @Value("${zy.datasource.password}")

    private String password;

    @Value("${zy.datasource.driver-class-name}")

    private String driverClassName;

    //    注解@Primary表示是主数据源

    @Bean("zyDataSource")

    @Primary

    public DataSource zyDataSource(){

        DruidDataSource dataSource = new DruidDataSource();

        dataSource.setUrl(url);

        dataSource.setUsername(username);

        dataSource.setPassword(password);

        dataSource.setDriverClassName(driverClassName);

        return dataSource;

    }

    //设置登录druid监控的用户名和密码

    @Bean

    public ServletRegistrationBean druidServlet() {

        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

        // IP白名单

        servletRegistrationBean.addInitParameter("allow", "127.0.0.1");

        // IP黑名单(共同存在时，deny优先于allow)

//        servletRegistrationBean.addInitParameter("deny", "192.168.1.100");

        //控制台管理用户

        servletRegistrationBean.addInitParameter("loginUsername", "admin");

        servletRegistrationBean.addInitParameter("loginPassword", "admin");

        //是否能够重置数据 禁用HTML页面上的“Reset All”功能

        servletRegistrationBean.addInitParameter("resetEnable", "false");

        return servletRegistrationBean;

    }

    @Bean(name = "zyTransactionManager")

    @Primary

    public DataSourceTransactionManager zyTransactionManager() {

        return new DataSourceTransactionManager(zyDataSource());

    }

    @Bean(name = "zySqlSessionFactory")

    @Primary

    public SqlSessionFactory zySqlSessionFactory(@Qualifier("zyDataSource") DataSource zyDataSource)

            throws Exception {

        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();

        sessionFactory.setDataSource(zyDataSource);

        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(ZyDataSourceConfig.MAPPER_LOCATION));

        return sessionFactory.getObject();

    }

}

实体类User

package com.example.demo.domain.yc;

public class User {

    private static final long serialVersionUID = 1L;

    private String userId;

    /**

     * $field.comment。

     */

    private String name;

    public String getUserId() {

        return userId;

    }

    public void setUserId(String userId) {

        this.userId = userId;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public String toString() {

        return "User{" +

                "userId='" + userId + '\'' +

                ", name='" + name + '\'' +

                '}';

    }

}

实体类block

package com.example.demo.domain.zy;

public class Block {

    private static final long serialVersionUID = 1L;

    private String blockId;

    /**

     * $field.comment。

     */

    private String blockName;

    public String getBlockId() {

        return blockId;

    }

    public void setBlockId(String blockId) {

        this.blockId = blockId;

    }

    public String getBlockName() {

        return blockName;

    }

    public void setBlockName(String blockName) {

        this.blockName = blockName;

    }

    @Override

    public String toString() {

        return "XyDicBlockT{" +

                "blockId='" + blockId + '\'' +

                ", blockName='" + blockName + '\'' +

                '}';

    }

}

mapper类

package com.example.demo.mapper.yc;

import com.example.demo.domain.yc.User;

public interface UserMapper {

    // 对应xml映射文件元素的ID

    User selectByPrimaryKey(String userId);

}

package com.example.demo.mapper.zy;

import com.example.demo.domain.zy.Block;

public interface BlockMapper  {

    // 对应xml映射文件元素的ID

    Block selectByPrimaryKey(String blockId);

}

service类

package com.example.demo.service;

import com.example.demo.mapper.yc.UserMapper;

import com.example.demo.mapper.zy.BlockMapper;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

@Service

public class ManySourceService {

    @Autowired

    BlockMapper BlockMapper;

    @Autowired

    UserMapper userMapper;

    //获取zy库中的block中的数据

    public String getZyBlock() {

        return  BlockMapper.selectByPrimaryKey("1").toString();

    }

    //获取yc库中的user中的数据

    public String getYcUser() {

        return  userMapper.selectByPrimaryKey("1").toString() ;

    }

}

xml文件

<?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.example.demo.mapper.yc.UserMapper">

    <resultMap id="BaseResultMap" type="com.example.demo.domain.yc.User">

        <result property="userId" column="USER_ID"/>

        <result property="name" column="NAME"/>

    </resultMap>

    <sql id="Base_Column_List">

        USER_ID,NAME

    </sql>

    <select id="selectByPrimaryKey" parameterType="String"  resultMap="BaseResultMap">

        select

        <include refid="Base_Column_List" />

        from TEST_USER_T

        where USER_ID =  #{userId,jdbcType=VARCHAR}

    </select>

</mapper>

<?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.example.demo.mapper.zy.BlockMapper">

    <resultMap id="BaseResultMap" type="com.example.demo.domain.zy.Block">

        <result property="blockId" column="block_Id"/>

        <result property="blockName" column="block_Name"/>

    </resultMap>

    <sql id="Base_Column_List">

        block_id,block_name

    </sql>

    <select id="selectByPrimaryKey" parameterType="String"  resultMap="BaseResultMap">

        select

        <include refid="Base_Column_List" />

        from TEST_BLOCK_T

        where block_Id = #{blockId,jdbcType=VARCHAR}

    </select>

</mapper>

6、启动项目访问项目

（1）访问http://localhost:8080/hello/getZyBlock 成功取到zy库里的数据

（2）访问http://localhost:8080/hello/getYcUser 成功取到yc库里的数据

（3）查看druid的数据源信息

先要执行一下上面两个请求这个页面才能出来（估计是不执行以上请求连接池里没有数据）

浏览器输入：http://localhost:8080/druid/

上下拖动发现有两个数据源

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