spring 集成 mybatis的實(shí)例詳解

更新時(shí)間：2021年01月08日 11:35:51 作者：corona_sgj

這篇文章主要介紹了spring 集成 mybatis的實(shí)例詳解,本文給大家介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或工作具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

環(huán)境配置

1>先創(chuàng)建maven的quickstart項(xiàng)目;并且創(chuàng)建dao層,service層,controller層,po層,mapper,resources以及下面的配置文件(db.properties,log4j.properties,mybatis.xml,spring.xml).

在這里插入圖片描述

2>配置pom.xml

修改jdk版本;

添加依賴:

junit版本改為4.12;spring-context;spring-test;spring-jdbc;spring-tx(事務(wù));aspectjweaver(切面編程);c3p0(連接池);mybatis;mybatis-spring;mysql-connector-java(mysql驅(qū)動(dòng)包);slf4j-log4j12,slf4j-api(日志打印);

設(shè)置資源目錄和插件

 <build>
 <!--
  Maven 項(xiàng)目:如果源代碼(src/main/java)存在xml、properties、tld 等文件
  Maven 默認(rèn)不會(huì)自動(dòng)編譯該文件到輸出目錄,如果要編譯源代碼中xml properties tld 等文件
  需要顯式配置 resources 標(biāo)簽
 -->
 <resources>
  <resource>
  <directory>src/main/resources</directory>
  </resource>
  <resource>
  <directory>src/main/java</directory>
  <includes>
   <include>**/*.xml</include>
   <include>**/*.properties</include>
   <include>**/*.tld</include>
  </includes>
  <filtering>false</filtering>
  </resource>
 </resources>
 </build>

3>配置spring.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"
  xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
  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.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop.xsd
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx.xsd">
  <!-- 掃描基本包 -->
  <context:component-scan base-package="com.xxxx" />

  <!-- 加載properties 配置文件 -->
  <context:property-placeholder location="classpath:db.properties" />

  <!-- aop -->
  <aop:aspectj-autoproxy />

  <!-- 配置c3p0 數(shù)據(jù)源 -->
  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driver}"></property>
    <property name="jdbcUrl" value="${jdbc.url}"></property>
    <property name="user" value="${jdbc.username}"></property>
    <property name="password" value="${jdbc.password}"></property>
  </bean>

  <!-- 配置事務(wù)管理器 -->
  <bean id="txManager"
     class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
  </bean>

  <!-- 設(shè)置事物增強(qiáng) -->
  <tx:advice id="txAdvice" transaction-manager="txManager">
    <tx:attributes>
      <tx:method name="add*" propagation="REQUIRED" />
      <tx:method name="insert*" propagation="REQUIRED" />
      <tx:method name="update*" propagation="REQUIRED" />
      <tx:method name="delete*" propagation="REQUIRED" />
    </tx:attributes>
  </tx:advice>

  <!-- aop 切面配置 -->
  <aop:config>
    <aop:pointcut id="servicePointcut" expression="execution(* com.xxxx.service..*.*(..))" />
    <aop:advisor advice-ref="txAdvice" pointcut-ref="servicePointcut" />
  </aop:config>

  <!-- 配置 sqlSessionFactory -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="classpath:mybatis.xml" />
    <property name="mapperLocations" value="classpath:com/xxxx/mapper/*.xml" />
  </bean>

  <!-- 配置掃描器 -->
  <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!-- 掃描com.xxxx.dao這個(gè)包以及它的子包下的所有映射接口類 -->
    <property name="basePackage" value="com.xxxx.dao" />
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
  </bean>
</beans>

4>配置 mybatis.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>
 <!-- 定義類別名 -->
 <typeAliases>
  <package name="com.xxxx.po"/>
 </typeAliases>
</configuration>

5>配置 db.properties

jdbc.url中?前面的spring_mybatis是數(shù)據(jù)庫(kù)名字,注意要修改下

password是密碼,也是要修改下的

6>添加日志

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_mybatis?
useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
jdbc.username=root
jdbc.password=root

log4j.properties

log4j.rootLogger=DEBUG, Console
# Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

添加源代碼

1>在po 包下創(chuàng)建 JavaBean 文件 User.java

public class User {
 private Integer userId;
 private String userName;
 private String userPwd;
 private String userEmail;
 private Date createDate;
 private Date updateDate;
 
 /**
  set get toString 方法省略
 **/
}

2>在dao層添加UserDao接口

public interface UserDao {
 User queryUserByUserId(Integer userId);
}

3>在mapper包添加UserMapper.xml 映射文件

sql代碼寫(xiě)在這地方

<?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">
<mapper namespace="com.xxxx.dao.UserDao">
  <select id="queryUserByUserId" parameterType="int"
resultType="com.xxxx.po.User">
   select user_id as userId,user_name as userName,user_pwd as userPwd
   from tb_user
   where user_id = #{userId}
  </select>
</mapper>

4>添加 UserService.java

@Service
public class UserService {
 @Autowired
 private UserDao userDao;
 public User queryUserByUserId(Integer userId){
  return userDao.queryUserByUserId(userId);
 }
}

5>添加 UserController.java

@Controller
public class UserController {
 // 注入userService
 @Resource
 private UserService userService;
 /**
 * 通過(guò)用戶ID查詢用戶對(duì)象
 * @param userId
 * @return
 */
 public User queryUserByUserId(Integer userId) {
  User user = userService.queryUserByUserId(userId);
  return user;
 }
}

執(zhí)行測(cè)試

public class App {
 public static void main(String[] args) {
  // 加載Spring的配置
  BeanFactory factory = new ClassPathXmlApplicationContext("spring.xml");
  // 得到UserController對(duì)象
  UserController userController = (UserController)
factory.getBean("userController");
  // 調(diào)用方法
  User user = userController.queryUserByUserId(1);
System.out.println(user.toString());
 }
}

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