MyBatis学习笔记2

最新推荐文章于 2025-05-02 21:20:09 发布

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原文链接：https://my.oschina.net/u/1030729/blog/698073

本文介绍了一个使用MyBatis 3.1.0、Struts2 2.3.1.2及Spring 3.1.1搭建的整合示例。该示例包括了数据库操作、服务层逻辑处理、事务管理等内容。

本次讲述的是MyBatis整合Struts2和Spring3的示例。

本文中使用的框架版本号为MyBatis3.1.0，Struts2.3.1.2，Spring3.1.1。

相关下载地址不再赘述，请读者自寻搜索下载。

本例中还使用到了其他的jar包，如commons-dbcp,commons-collections,commons-logging,commons-pool,log4j,slf4j。所需要的所有jar包截图如下：

1.建立一个web工程ssm，选择好运行环境：

2.导入上图中所有的jar包，文件组织方式如图所示：

2.在MySQL中建立数据库mybatis，

建表语句如下：

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(100) DEFAULT NULL,
  `password` varchar(100) DEFAULT NULL,
  `role` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=28 DEFAULT CHARSET=utf8;

INSERT INTO `user` VALUES ('1', 'zhangsan', '123456', 'user');
INSERT INTO `user` VALUES ('2', 'lisi', '123456', 'user');
INSERT INTO `user` VALUES ('3', 'admin', 'admin', 'admin');

3.工程中的文件源码如下：

UserMapper.java

package com.ssm.mapper;

import com.ssm.pojo.User;

public interface UserMapper {
	int insertUser(User user);
	User selectUser(int id);
}

UserMapper.xml

<?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.ssm.mapper.UserMapper">
	<select id="selectUser" parameterType="int" resultType="com.ssm.pojo.User">
		select * from User where id = #{id}
	</select>
	
	<insert id="insertUser" parameterType="com.ssm.pojo.User" useGeneratedKeys="true" keyProperty="id">
		insert into User(username,password,role)
		values(#{username},#{password},#{role})
	</insert>
</mapper>

User.java

package com.ssm.pojo;

import java.io.Serializable;

public class User implements Serializable {
	private static final long serialVersionUID = -4260619761538644683L;
	private Integer id;
	private String username;
	private String password;
	private String role;
	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 getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getRole() {
		return role;
	}
	public void setRole(String role) {
		this.role = role;
	}
}

UserService.java

package com.ssm.service;

import org.springframework.beans.factory.annotation.Autowired;

@Service(value="userService")
public class UserService {
	
	@Autowired
	private UserMapper userMapper;
	
	//让Spring帮助进行事务回滚
	@Transactional
	public User register(User user){
		//此处的length表示的是更改生效的行数，大于0即表示新增成功，然后user对象的id值被自动赋予新值
		int length = userMapper.insertUser(user);
		if (length>0) {
			return user;
		}else {
			//新增失败，抛出异常，让spring进行事物回滚
			throw new RuntimeException();
		}
	}
}

UserAction.java

package com.ssm.web;

import javax.annotation.Resource;
@Namespace(value="/work")
public class UserAction extends ActionSupport {
	private static final long serialVersionUID = 8907605561460172723L;
	
	@Resource(name="userService")
	private UserService userService;
	
	private User userReg;
	public User getUserReg() {
		return userReg;
	}
	public void setUserReg(User userReg) {
		this.userReg = userReg;
	}
	
	@Action(value="user", results={
			@Result(name="success",location="/WEB-INF/content/success.jsp"),
			@Result(name="error",location="/WEB-INF/content/error.jsp")
	})
	public String register(){
		userReg = userService.register(userReg);
		if (userReg!=null) {
			return SUCCESS;
		}else {
			return ERROR;
		}
	}
}

applicationContext.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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
	http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
	http://www.springframework.org/schema/tx 
	http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context-3.1.xsd
	http://www.springframework.org/schema/jdbc 
	http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd">
	
	<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
		<property name="ignoreResourceNotFound" value="true" />
		<property name="locations">
			<list>
				<value>classpath*:/config.properties</value>
			</list>
		</property>
	</bean>
	
	<!-- 开启注解配置 -->  
    <context:annotation-config />
    
    <!-- 扫描service层 -->
    <context:component-scan base-package="com.ssm.service" />
    
    <!-- 开启事务注解驱动 -->  
    <tx:annotation-driven />
	
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="typeAliasesPackage" value="com.ssm.pojo" />   
	</bean>
	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
	</bean>
	
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    
    <!-- 自动扫描映射器 -->  
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
        <property name="basePackage" value="com.ssm.mapper" />  
    </bean>
</beans>

config.properties

#mysql version database setting
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:9906/mybatis
jdbc.username=root
jdbc.password=root

log4j.properties

# Rules reminder:
# DEBUG < INFO < WARN < ERROR < FATAL

# Global logging configuration
log4j.rootLogger=DEBUG, stdout

# My logging configuration...
log4j.logger.org.mybatis.jpetstore=DEBUG

## Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p %d %C: %m%n

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
	"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<constant name="struts.enable.DynamicMethodInvocation" value="true" />
	<constant name="struts.devMode" value="true" />
	<constant name="struts.convention.package.locators" value="web" />
	<constant name="struts.convention.default.parent.package"
		value="params-default" />
	<package name="params-default" extends="convention-default">
		<interceptors>
			<interceptor-stack name="paramsStack">
				<interceptor-ref name="store">
					<param name="operationMode">AUTOMATIC</param>
				</interceptor-ref>
				<interceptor-ref name="paramsPrepareParamsStack" />
			</interceptor-stack>
		</interceptors>
		<default-interceptor-ref name="paramsStack" />
	</package>
</struts>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>注册页面</title>
</head>
<body>
欢迎注册，请在这里输入必要的注册信息：
<s:form action="work/user!register.action" method="post">
	<s:textfield name="userReg.username" label="用户名"></s:textfield>
	<s:password name="userReg.password" label="密码"></s:password>
	<s:textfield name="userReg.role" label="角色"></s:textfield>
	<s:submit value="提交"></s:submit>
</s:form>
</body>
</html>

4.运行该工程，截图如下：