四尚筹网项目-后台-Spring整合MyBatis

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一、目标与思路

1.1、 目标

adminMapper通过IOC容器装配到当前组件中后，就可以直接调用它的方法，享受到框架给我们提供的方便。

package com.atguigu.crowd.service.impl;

import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.mapper.AdminMapper;
import com.atguigu.crowd.service.api.AdminService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service
public class AdminServiceImpl implements AdminService {
    @Autowired
    private AdminMapper adminMapper;

    @Override
    public Admin getAdminList(Integer adminId) {
        // adminMapper 通过IOC容器装配到当前组件中后，就可以直接调用它的方法，享受框架给我们提供的方便。
        return adminMapper.selectByPrimaryKey(adminId);
    }
}

1.2、思路

image.png

二、操作清单

在子工程中加入搭建环境所需要的具体依赖
准备 jdbc.properties
创建 Spring 配置文件专门配置 Spring 和 MyBatis 整合相关
在 Spring 的配置文件中加载 jdbc.properties 属性文件
配置数据源
测试从数据源中获取数据库连接
配置 SqlSessionFactoryBean
装配数据源
指定 XxxMapper.xml 配置文件的位置
指定 MyBatis 全局配置文件的位置（可选）
配置 MapperScannerConfigurer
测试是否可以装配 XxxMapper 接口并通过这个接口操作数据库

2.1、在子工程中加入搭建环境所需的具体依赖

image.png

<!-- Spring 依赖 -->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-orm</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-webmvc</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
	<groupId>org.aspectj</groupId>
	<artifactId>aspectjweaver</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/cglib/cglib -->
<dependency>
	<groupId>cglib</groupId>
	<artifactId>cglib</artifactId>
</dependency>
<!-- mysql 驱动 -->
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- 数据源 -->
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
</dependency>
<!-- MyBatis -->
<dependency>
	<groupId>org.mybatis</groupId>
	<artifactId>mybatis</artifactId>
</dependency>
<!-- MyBatis 与 Spring 整合 -->
<dependency>
	<groupId>org.mybatis</groupId>
	<artifactId>mybatis-spring</artifactId>
</dependency>
<!-- MyBatis 分页插件 -->
<dependency>
	<groupId>com.github.pagehelper</groupId>
	<artifactId>pagehelper</artifactId>
</dependency>
<!-- Spring 进行 JSON 数据转换依赖 -->
<dependency>
	<groupId>com.fasterxml.jackson.core</groupId>
	<artifactId>jackson-core</artifactId>
</dependency>
<dependency>
	<groupId>com.fasterxml.jackson.core</groupId>
	<artifactId>jackson-databind</artifactId>
</dependency>
<!-- JSTL 标签库 -->
<dependency>
	<groupId>jstl</groupId>
	<artifactId>jstl</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
	<groupId>com.google.code.gson</groupId>
	<artifactId>gson</artifactId>
</dependency>

2.2、数据库连接信息

image.png

jdbc.user=root
jdbc.password=root
jdbc.url=jdbc:mysql://localhost:3306/project_crowd?useUnicode=true&characterEncoding=UTF-8
jdbc.driver=com.mysql.jdbc.Driver

2.3、mybatis-config.xml

image.png

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
</configuration>

2.4、创建 spring-persist-mybatis.xml

创建 Spring 配置文件专门配置 Spring 和 MyBatis 整合相关
image.png

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
</beans>

2.4.1、配置数据源

在 spring-persist-mybatis.xml 配置文件进行配置

    <!-- 加载外部属性文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="driverClassName" value="${jdbc.driver}"/>
    </bean>

创建 Spring 的 Junit 测试类
image.png

package com.atguigu.crowd.test;

import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.mapper.AdminMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

// 指定 Spring 给 Junit 提供的运行器类
@RunWith(SpringJUnit4ClassRunner.class)
// 加载 Spring 配置文件的注解
@ContextConfiguration(locations = {"classpath:spring-persist-mybatis.xml"})
public class CrowdSpringTest {
    @Autowired
    private DataSource dataSource;
    @Test
    public void testDataSource() throws SQLException {
        // 1.通过数据源对象获取数据源连接
        Connection connection = dataSource.getConnection();
        // 2.打印数据库连接
        System.out.println(connection);
    }
}

修改atcrowdfunding02-admin-webui的pom文件，主要是添加测试相关的依赖。

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>atcrowdfunding01-admin-parent</artifactId>
        <groupId>com.atguigu.crowd</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>atcrowdfunding02-admin-webui</artifactId>
    <packaging>war</packaging>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.atguigu.crowd</groupId>
            <artifactId>atcrowdfunding03-admin-component</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!-- junit测试 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

</project>

image.png

2.4.2、配置 SqlSessionFactoryBean

修改atcrowdfunding02-admin-webui/src/main/resources/mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <!-- 加载外部属性文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="driverClassName" value="${jdbc.driver}"/>
    </bean>
    <!-- 配置SqlSessionFactoryBean整合MyBatis -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定MyBatis全局配置文件位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>

        <!-- 指定Mapper.xml配置文件位置 -->
        <property name="mapperLocations" value="classpath:mybatis/mapper/*Mapper.xml"/>

        <!-- 装配数据源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>

2.4.3、配置 MapperScannerConfigurer

修改atcrowdfunding02-admin-webui/src/main/resources/mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <!-- 加载外部属性文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="driverClassName" value="${jdbc.driver}"/>
    </bean>
    <!-- 配置SqlSessionFactoryBean整合MyBatis -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定MyBatis全局配置文件位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>

        <!-- 指定Mapper.xml配置文件位置 -->
        <property name="mapperLocations" value="classpath:mybatis/mapper/*Mapper.xml"/>

        <!-- 装配数据源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!-- 配置MapperScannerConfigurer来扫描Mapper接口所在的包 -->
    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.atguigu.crowd.mapper"/>
    </bean>

</beans>

测试

package com.atguigu.crowd.test;

import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.mapper.AdminMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

// 指定 Spring 给 Junit 提供的运行器类
@RunWith(SpringJUnit4ClassRunner.class)
// 加载 Spring 配置文件的注解
@ContextConfiguration(locations = {"classpath:spring-persist-mybatis.xml"})
public class CrowdSpringTest {
    @Autowired
    private DataSource dataSource;
    @Autowired
    private AdminMapper adminMapper;
    @Test
    public void testAdminMapperAutowired() {
        Admin admin = new Admin(null,"zhangsan","123123","张三","zhangsan@163.com",null);
        int count = adminMapper.insert(admin);
        System.out.println("受影响的行数:"+count三尚筹网项目-后台-基于 Maven 的 MyBatis 逆向工程


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