13.从零开始学springboot-jdbc-多数据源

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上节实现springboot jpa多数据源案例，本节介绍springboot jdbc多数据源案例。包括创建springboot空项目、添加依赖和配置、新建数据库及表、完善目录结构等步骤，还给出项目地址和数据源配置文件注释参考博文。

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前言

上一节实现了springboot jpa多数据源案例，本节将实现springboot jdbc多数据源案例

创建项目

IDEA创建一个springboot空项目即可，过程略

添加依赖

pom.xml:

        <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-jdbc</artifactId>
        </dependency>

添加配置

application.yml:

spring:
  datasource:
    master:
      username: root
      password: 123456
      jdbc-url: jdbc:mysql://192.168.145.131:3306/test
#      url: jdbc:mysql://192.168.145.131:3306/test
      driver-class-name: com.mysql.cj.jdbc.Driver
    slave:
      username: root
      password: 123456
      jdbc-url: jdbc:mysql://192.168.145.131:3306/test2
#      url: jdbc:mysql://192.168.145.131:3306/test2
      driver-class-name: com.mysql.cj.jdbc.Driver
  jpa:
    properties:
      hibernate:
        hbm2ddl:
          auto: update

建库

我们新增test/test2数据库
test新建表

DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
  `id` int(11) NOT NULL,
  `age` int(11) NOT NULL,
  `grade` int(11) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

INSERT INTO `student` VALUES ('1', '1', '1', '1');

test2新建表：

DROP TABLE IF EXISTS `teacher`;
CREATE TABLE `teacher` (
  `id` int(11) NOT NULL,
  `age` varchar(255) DEFAULT NULL,
  `course` varchar(255) DEFAULT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

INSERT INTO `teacher` VALUES ('1', '1', '1', '1');

完善

目录结构

config/DataSource:

package com.mrcoder.sbjdbcmultidb.config;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
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.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;

@Configuration
public class DataSourceConfig {
    //方案一
    @Primary
    @Bean(name = "masterDataSource")
    @Qualifier("masterDataSource")
    @ConfigurationProperties(prefix="spring.datasource.master")
    public DataSource masterDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "slaveDataSource")
    @Qualifier("slaveDataSource")
    @ConfigurationProperties(prefix="spring.datasource.slave")
    public DataSource slaveDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "masterJdbcTemplate")
    @Qualifier("masterJdbcTemplate")
    public JdbcTemplate masterJdbcTemplate(@Qualifier("masterDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name = "slaveJdbcTemplate")
    @Qualifier("slaveJdbcTemplate")
    public JdbcTemplate slaveJdbcTemplate(@Qualifier("slaveDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }




    //方案二(请将方案一注释，application.yml修改jdbc-url为url)

//    //master库
//    @Primary
//    @Bean(name = "masterDataSourceProperties")
//    @Qualifier("masterDataSourceProperties")
//    @ConfigurationProperties(prefix = "spring.datasource.master")
//    public DataSourceProperties masterDataSourceProperties() {
//        return new DataSourceProperties();
//    }
//
//    @Primary
//    @Bean(name = "masterDataSource")
//    @Qualifier("masterDataSource")
//    @ConfigurationProperties(prefix = "spring.datasource.master")
//    public DataSource masterDataSource(@Qualifier("masterDataSourceProperties") DataSourceProperties dataSourceProperties) {
//        return dataSourceProperties.initializeDataSourceBuilder().build();
//    }
//
//    //slave库
//    @Bean(name = "slaveDataSourceProperties")
//    @Qualifier("slaveDataSourceProperties")
//    @ConfigurationProperties(prefix = "spring.datasource.slave")
//    public DataSourceProperties slaveDataSourceProperties() {
//        return new DataSourceProperties();
//    }
//
//    @Bean(name = "slaveDataSource")
//    @Qualifier("slaveDataSource")
//    @ConfigurationProperties(prefix = "spring.datasource.slave")
//    public DataSource slaveDataSource(@Qualifier("slaveDataSourceProperties") DataSourceProperties dataSourceProperties) {
//        return dataSourceProperties.initializeDataSourceBuilder().build();
//    }

}

entity/Student:

package com.mrcoder.sbjdbcmultidb.entity;

public class Student {
    private int id;

    private String name;

    private int age;

    private int grade;

    public Student() {
    }

    public Student(String name, int age, int grade) {
        this.name = name;
        this.age = age;
        this.grade = grade;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", grade=" + grade +
                '}';
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }
}

entity/Teacher:

package com.mrcoder.sbjdbcmultidb.entity;

public class Teacher {

    private int id;
    private String name;
    private String age;
    private String course;

    public Teacher() {
    }

    public Teacher(String name, String age, String course) {
        this.name = name;
        this.age = age;
        this.course = course;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age='" + age + '\'' +
                ", course='" + course + '\'' +
                '}';
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getCourse() {
        return course;
    }

    public void setCourse(String course) {
        this.course = course;
    }
}

controller/JdbcMultidbController:

package com.mrcoder.sbjdbcmultidb.controller;

import com.mrcoder.sbjdbcmultidb.entity.Student;
import com.mrcoder.sbjdbcmultidb.entity.Teacher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class JdbcMultidbController {


    //master
    @Autowired
    @Qualifier("masterJdbcTemplate")
    protected JdbcTemplate masterTempleate;

    //slave
    @Autowired
    @Qualifier("slaveJdbcTemplate")
    protected JdbcTemplate slaveTempleate;

    @RequestMapping(value = "/list")
    public void list(){
        String studentSql = "select * from student";
        RowMapper<Student> studentRowMapper = new BeanPropertyRowMapper<>(Student.class);
        List<Student> studentList = masterTempleate.query(studentSql, studentRowMapper);

        String teacherSql = "select * from teacher";
        RowMapper<Teacher> teacherRowMapper = new BeanPropertyRowMapper<>(Teacher.class);
        List<Teacher> teacherList = slaveTempleate.query(teacherSql, teacherRowMapper);

        System.out.println(studentList);
        System.out.println(teacherList);

    }
}