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

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.3.15</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.15</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>3.3.2</version>
        </dependency>

        <!--dbcp连接池-->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.6</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

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

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

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
        "
>
    <context:component-scan base-package="com.hubing.*"/>

    <context:property-placeholder location="classpath:database.properties"/>
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close" scope="singleton">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="minIdle" value="${jdbc.minIdle}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
    </bean>
    <!--配置sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--<property name="configLocation" value="classpath:mybatis-config.xml"/>-->
        <property name="typeAliasesPackage" value="com.hubing.hb.pojo"></property>
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>
    <!--扫描映射文件(mapper动态代理)-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.hubing.hb.dao"/>
    </bean>
    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 开启注解 -->
    <mvc:annotation-driven/>
    <!--transaction-manager="transactionManager"一定要加上,否则会报错,该配置是以事物的方式开启注解-->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

 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<Customer> 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）

<?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">

<!-- 1.namespace:接口的一个路径 ,2.id :接口下抽象方法名
    3.接口的返回值和resultType 对应上 ，4接口的参数 对应上-->
<mapper namespace="com.hubing.hb.dao.CustomerDao">
    <select id="query" resultType="com.hubing.hb.pojo.Customer">
        select * from customer
    </select>
    <insert id="add">
        insert into customer (username , jobs , phone) values (#{username} , #{jobs} , #{phone})
    </insert>
</mapper>

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<Customer> 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<Customer> query() {
        List<Customer> 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<Customer> 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：