Spring+Mybatis整合

创建mybatis数据库并创建customer表

创建一个工程，我这里选择的是maven web，也可以选择SpringBoot工程。

创建meven web工程需导入依赖。导入

            org.springframework.boot
            spring-boot-starter
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework
            spring-tx
            5.3.15
        
        
            org.springframework
            spring-jdbc
            5.3.15
        
        
            mysql
            mysql-connector-java
            5.1.45
        

        
            com.baomidou
            mybatis-plus
            3.3.2
        

        
        
            commons-dbcp
            commons-dbcp
            1.4
        
        
            commons-pool
            commons-pool
            1.6
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        

导入依赖后在resourse下创建 database.properties添加数据库连接池配置

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/mybatis?useUnicode=true&characterEncoding=utf-8
jdbc.user=root
jdbc.password=x5
jdbc.minIdle=45
jdbc.maxIdle=50
jdbc.initialSize=5
jdbc.maxActive=100
jdbc.maxWait=100
jdbc.removeAbandonedTimeout=180
jdbc.removeAbandoned=true

在resources下创建spring-mybatis.xml（名字可以随意写）添加数据库连接池并配置spring扫描包、配置sqlsession工厂和mapper动态代理

 创建Customer实体类并添加get/set、toString方法

package com.hubing.hb.pojo;

public class Customer {
    private Integer id;
    private String username;
    private String jobs;
    private String phone;

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getJobs() {
        return jobs;
    }

    public void setJobs(String jobs) {
        this.jobs = jobs;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "Customer{" +
                "id=" + id +
                ", username='" + username + ''' +
                ", jobs='" + jobs + ''' +
                ", phone='" + phone + ''' +
                '}';
    }
}

 创建dao层

package com.hubing.hb.dao;

import com.hubing.hb.pojo.Customer;

import java.util.List;

public interface CustomerDao {

    public List query();

    public void add(Customer customer);

}

在resources下创建mapper文件夹并在mapper下创建customerMapper.xml（注意：namespace的接口和方法的返回值类型）

    
        select * from customer
    
    
        insert into customer (username , jobs , phone) values (#{username} , #{jobs} , #{phone})
    

创建service层（业务层）

package com.hubing.hb.service;

import com.hubing.hb.pojo.Customer;
import com.hubing.hb.pojo.Student;

import java.util.List;

public interface CustomerService {
    public List query();

    public void add(Customer customer, Student student);

}

创建serviceimpl（业务层的接口实现类）（注意：@Service是将实现类添加到spring组件中）

package com.hubing.hb.service.impl;

import com.hubing.hb.dao.CustomerDao;
import com.hubing.hb.dao.StudentDao;
import com.hubing.hb.pojo.Customer;
import com.hubing.hb.pojo.Student;
import com.hubing.hb.service.CustomerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class CustomerServiceImpl implements CustomerService {

    @Autowired
    CustomerDao dao;

    @Autowired
    StudentDao studentDao;

    public List query() {
        List list = dao.query();
        return list;
    }

    @Transactional
    public void add(Customer customer, Student student) {
        dao.add(customer);
        studentDao.add(student);
    }

}

创建controller层实现调用

package com.hubing.hb.controller;

import com.hubing.hb.pojo.Customer;
import com.hubing.hb.pojo.Student;
import com.hubing.hb.service.CustomerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import java.util.List;

@Controller
public class CustomerController {
    @Autowired
    CustomerService service;

    public String query() {
        List list = service.query();
        System.out.println(list);
        return null;
    }

    public String add(Customer customer, Student student) {
        service.add(customer, student);
        return null;
    }
}

最后创建测试类测试

package com.hubing.hb;

import com.hubing.hb.controller.CustomerController;
import com.hubing.hb.pojo.Customer;
import com.hubing.hb.pojo.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestDemo {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-mybatis.xml");

        for (String beanName : context.getBeanDefinitionNames()) {
            System.out.println(beanName + ":" + context.getBean(beanName));
        }

        CustomerController controller = (CustomerController) context.getBean("customerController");
        Customer customer = new Customer();
        customer.setUsername("郝六");
        customer.setPhone("12222222");
        customer.setJobs("java");

      
        controller.add(customer);
    }
}

运行结果如下：