Spring 整合 MyBatis的實(shí)現(xiàn)步驟

更新時(shí)間：2023年02月24日 11:12:37 作者：Java Fans

SpringMVC 本來就是 Spring 框架的一部分，這兩者無須再做整合，所以 SSM 整合的關(guān)鍵就是Spring對(duì)MyBatis的整合，三大框架整合完成后，將以 Spring 為核心，調(diào)用有關(guān)資源，高效運(yùn)作，這篇文章主要介紹了 Spring 整合 MyBatis的實(shí)現(xiàn)步驟,需要的朋友可以參考下

Spring 整合 MyBatis 可以實(shí)現(xiàn)讓數(shù)據(jù)庫連接，事務(wù)管理，實(shí)例化對(duì)象的創(chuàng)建與依賴關(guān)系等都統(tǒng)一由 Spring 負(fù)責(zé)，以及數(shù)據(jù)庫的增刪改查操作由 spring-mybatis 整合包提供的 SqlSessionTemplate 對(duì)象來操作，或者利用整合包掃描接口，依據(jù) Mapper 映射文件直接創(chuàng)建代理實(shí)現(xiàn)類，無須程序員手工實(shí)現(xiàn)接口，大大簡(jiǎn)化了開發(fā)流程。SpringMVC 本來就是 Spring 框架的一部分，這兩者無須再做整合，所以 SSM 整合的關(guān)鍵就是Spring對(duì)MyBatis的整合，三大框架整合完成后，將以 Spring 為核心，調(diào)用有關(guān)資源，高效運(yùn)作。

一、Spring 項(xiàng)目整體目錄結(jié)構(gòu)

二、Spring 整合 MyBatis 開發(fā)環(huán)境

Spring 整合 MyBatis 開發(fā)環(huán)境除了需要 Spring 的jar包和 MyBatis 的jar包，還需要 Spring 與 MyBatis 整合的中間件 mybatis-spring-xxx.jar，此外還需要數(shù)據(jù)庫驅(qū)動(dòng)jar包 mysql-connector-java-xxx.jar。

三、Mapper 接口無實(shí)現(xiàn)類開發(fā)整合

項(xiàng)目案例：Spring + MyBatis 實(shí)現(xiàn)對(duì) user 數(shù)據(jù)庫的查詢。

實(shí)現(xiàn)步驟：

【1】創(chuàng)建一個(gè) Maven 項(xiàng)目，然后再 pom.xml 文件中添加相關(guān)依賴

<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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>cn.kgc.sm</groupId>
  <artifactId>spring06</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>spring06</name>
  <url>http://maven.apache.org</url>

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

  <dependencies>
    <!--測(cè)試工具-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!--mysql驅(qū)動(dòng)-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
    </dependency>

    <!--druid-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.9</version>
    </dependency>

    <!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.9</version>
    </dependency>

    <!--IOC 依賴注入-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.3.9</version>
    </dependency>

    <!--mybatis&spring 整合包-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.5</version>
    </dependency>

    <!--aspects 切面-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>5.3.9</version>
    </dependency>

    <!--jdbc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.3.9</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.3.9</version>
    </dependency>

    <!--lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.16</version>
    </dependency>

    <!-- 日志工具-->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <!--mybatis分頁插件-->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.2.1</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.3.9</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

【2】在 resources —> config 目錄下，創(chuàng)建數(shù)據(jù)庫配置文件 jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///java2218?serverTimezone=UTC&useSSL=false&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root

【3】在 resources —> config 目錄下，創(chuàng)建 MyBatis 配置文件 mybatis-config.xml

<?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>
    <settings>
        <setting name="logImpl" value="LOG4J"/>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--全局開啟二級(jí)緩存-->
        <setting name="cacheEnabled" value="true"/>
    </settings>
    <!--配置mybatis分頁插件-->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <!-- 配置mysql方言 -->
            <property name="helperDialect" value="mysql" />
            <!-- 設(shè)置為true時(shí)，如果pageSize=0就會(huì)查詢出全部的結(jié)果 -->
            <property name="pageSizeZero" value="true" />
            <!-- 3.3.0版本可用，分頁參數(shù)合理化，默認(rèn)false禁用 -->
            <!-- 啟用合理化時(shí)，如果pageNum<1會(huì)查詢第一頁，如果pageNum>pages會(huì)查詢最后一頁 -->
            <!-- 禁用合理化時(shí)，如果pageNum<1或pageNum>pages會(huì)返回空數(shù)據(jù) -->
            <property name="reasonable" value="true" />
        </plugin>
    </plugins>
</configuration>

【4】在 resources —> config 目錄下，創(chuàng)建 Spring 配置文件 spring-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 https://www.springframework.org/schema/context/spring-context.xsd">
    
    <!--引入外部數(shù)據(jù)源的配置參數(shù)-->
    <context:property-placeholder location="classpath:config/jdbc.properties"></context:property-placeholder>

    <!--初始化數(shù)據(jù)庫連接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--設(shè)置數(shù)據(jù)庫連接池-->
        <property name="dataSource" ref="dataSource"></property>
        <!--設(shè)置mybatis全局配置文件位置-->
        <property name="configLocation" value="config/mybatis-config.xml"></property>
        <!--設(shè)置別名的包-->
        <property name="typeAliasesPackage" value="cn.kgc.sm"></property>
        <!--設(shè)置mapper.xml文件的位置-->
        <property name="mapperLocations" value="mapper/*.xml"></property>
    </bean>

    <!--mapper接口掃描  生成接口代理對(duì)象 同時(shí)完成對(duì)象的托管-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.kgc.sm.mapper"></property>
    </bean>

    <!--開啟包掃描  base-package  設(shè)置需要掃描的包 -->
    <context:component-scan base-package="cn.kgc.sm"></context:component-scan>
</beans>

【5】創(chuàng)建實(shí)體類 User

package cn.kgc.sm.entity;

import lombok.Data;

@Data
public class User {

  private Integer uId;
  private String uName;
  private String uPassword;
  private Integer uState;

}

【6】創(chuàng)建 Mapper 接口 UserMapper

package cn.kgc.sm.mapper;

import cn.kgc.sm.entity.User;

import java.util.List;

public interface UserMapper {
    List<User> selectAll();
}

【7】創(chuàng)建與 UserMapper 接口映射的 UserMapper.xml 文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.kgc.sm.mapper.UserMapper">

  <select id="selectAll" resultType="user">
    select * from user
  </select>
</mapper>

【8】創(chuàng)建 Service 業(yè)務(wù)層接口 UserService

package cn.kgc.sm.service;

import cn.kgc.sm.entity.User;
import cn.kgc.sm.mapper.UserMapper;

import java.util.List;

public interface UserService {
    List<User> selectAll();
}

【9】創(chuàng)建 UserService 接口的實(shí)現(xiàn)類 UserServiceImpl

package cn.kgc.sm.service.impl;

import cn.kgc.sm.entity.User;
import cn.kgc.sm.mapper.UserMapper;
import cn.kgc.sm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserMapper userMapper;


    @Override
    public List<User> selectAll() {
        System.out.println("users = ");
        List<User> users = userMapper.selectAll();

        System.out.println("users = " + users);
        return users;
    }
}

【10】創(chuàng)建測(cè)試類

package cn.kgc.sm.mapper;

import cn.kgc.sm.entity.User;
import cn.kgc.sm.service.UserService;
import junit.framework.TestCase;
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 java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:config/spring-config.xml")
public class UserMapperTest {
    @Autowired
    UserService userService;

    @Test
    public void Test01(){
        List<User> users = userService.selectAll();
        users.forEach(user -> System.out.println("user = " + user));
//        for (User user : users) {
//            System.out.println("user = " + user);
//        }
    }

}

運(yùn)行結(jié)果：