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Mybatis与Spring集成(易百教程)

时间:2018-07-18 00:34:12      阅读:176      评论:0      收藏:0      [点我收藏+]

标签:技术分享   cto   配置   sso   列表   enc   common   stat   erb   

整个Mybatis与Spring集成示例要完成的步骤如下:

1、示例功能描述

2、创建工程

3、数据库表结构及数据记录

4、实例对象

5、配置文件

6、测试执行,输出结果

1、示例功能描述

在本示例中,需要完成这样的一个简单功能,即,指定一个用户(ID=1),查询出这个用户的基本信息,并关联查询这个用户的所有订单。

2、创建工程

 首先创建一个工程的名称为:mybatis07-spring,在 src 源代码目录下建立文件夹 config,并将原来的 mybatis 配置文件 Configuration.xml 移动到这个文件夹中, 并在 config 文家夹中建立 Spring 配置文件:applicationContext.xml。工程结构目录如下:

技术分享图片

3、数据库表结构及数据记录

在本示例中,用到两个表:用户表和订单表,其结构和数据记录如下:

CREATE TABLE `user` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `username` varchar(64) NOT NULL DEFAULT ‘‘,
  `mobile` varchar(16) NOT NULL DEFAULT ‘‘,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (‘1‘, ‘yiibai‘, ‘13838009988‘);
INSERT INTO `user` VALUES (‘2‘, ‘saya‘, ‘13838009988‘);

订单表结构和数据如下:

CREATE TABLE `order` (
  `order_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `user_id` int(10) unsigned NOT NULL DEFAULT ‘0‘,
  `order_no` varchar(16) NOT NULL DEFAULT ‘‘,
  `money` float(10,2) unsigned DEFAULT ‘0.00‘,
  PRIMARY KEY (`order_id`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of order
-- ----------------------------
INSERT INTO `order` VALUES (‘1‘, ‘1‘, ‘1509289090‘, ‘99.90‘);
INSERT INTO `order` VALUES (‘2‘, ‘1‘, ‘1519289091‘, ‘290.80‘);
INSERT INTO `order` VALUES (‘3‘, ‘1‘, ‘1509294321‘, ‘919.90‘);
INSERT INTO `order` VALUES (‘4‘, ‘1‘, ‘1601232190‘, ‘329.90‘);
INSERT INTO `order` VALUES (‘5‘, ‘1‘, ‘1503457384‘, ‘321.00‘);
INSERT INTO `order` VALUES (‘6‘, ‘1‘, ‘1598572382‘, ‘342.00‘);
INSERT INTO `order` VALUES (‘7‘, ‘1‘, ‘1500845727‘, ‘458.00‘);
INSERT INTO `order` VALUES (‘8‘, ‘1‘, ‘1508458923‘, ‘1200.00‘);
INSERT INTO `order` VALUES (‘9‘, ‘1‘, ‘1504538293‘, ‘2109.00‘);
INSERT INTO `order` VALUES (‘10‘, ‘1‘, ‘1932428723‘, ‘5888.00‘);
INSERT INTO `order` VALUES (‘11‘, ‘1‘, ‘2390423712‘, ‘3219.00‘);
INSERT INTO `order` VALUES (‘12‘, ‘1‘, ‘4587923992‘, ‘123.00‘);
INSERT INTO `order` VALUES (‘13‘, ‘1‘, ‘4095378812‘, ‘421.00‘);
INSERT INTO `order` VALUES (‘14‘, ‘1‘, ‘9423890127‘, ‘678.00‘);
INSERT INTO `order` VALUES (‘15‘, ‘1‘, ‘7859213249‘, ‘7689.00‘);
INSERT INTO `order` VALUES (‘16‘, ‘1‘, ‘4598450230‘, ‘909.20‘);

4、实例对象

用户表和订单表分别对应两个实例对象,分别是:User.java 和 Order.java,它们都在 com.yiibai.pojo 包中。

User.java代码内容如下:

package com.yiibai.pojo;

import java.util.List;

/** 
 * @describe: User
 * @author: Yiibai 
 * @version: V1.0
 * @copyright http://www.yiibai.com
 */  
public class User {
	private int id;
	private String username;
	private String mobile;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getMobile() {
		return mobile;
	}
	public void setMobile(String mobile) {
		this.mobile = mobile;
	}
	
}

Order.java代码内容如下:

 

package com.yiibai.pojo;

/**
 * @describe: Order - 订单
 * @author: Yiibai
 * @version: V1.0
 * @copyright http://www.yiibai.com
 */
public class Order {
	private int orderId;
	private String orderNo;
	private float money;
	private int userId;
	private User user;
	
	
	public int getUserId() {
		return userId;
	}
	public void setUserId(int userId) {
		this.userId = userId;
	}
	public int getOrderId() {
		return orderId;
	}
	public void setOrderId(int orderId) {
		this.orderId = orderId;
	}
	public User getUser() {
		return user;
	}
	public void setUser(User user) {
		this.user = user;
	}
	public String getOrderNo() {
		return orderNo;
	}
	public void setOrderNo(String orderNo) {
		this.orderNo = orderNo;
	}
	public float getMoney() {
		return money;
	}
	public void setMoney(float money) {
		this.money = money;
	}

}

5、配置文件

这个实例中有三个重要的配置文件,它们分别是:applicationContext.xml , Configuration.xml 以及 UserMaper.xml。

applicationContext.xml  配置文件里最主要的配置:

<?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>
	<typeAliases>
		<typeAlias alias="User" type="com.yiibai.pojo.User" />
		<typeAlias alias="Order" type="com.yiibai.pojo.Order" />
	</typeAliases>
	<!-- Mybatis和Spring 集成之后,这些可以完全删除(注释掉),数据库连接的管理交给 Spring 来管理 -->
	<!--
		<environments default="development"> <environment id="development">
		<transactionManager type="JDBC"/> <dataSource type="POOLED"> <property
		name="driver" value="com.mysql.jdbc.Driver"/> <property name="url"
		value="jdbc:mysql://127.0.0.1:3306/yiibai?characterEncoding=utf8" />
		<property name="username" value="root"/> <property name="password"
		value=""/> </dataSource> </environment> </environments>
	-->
	<mappers>
		<mapper resource="com/yiibai/maper/UserMaper.xml" />
	</mappers>
</configuration>

配置文件 Configuration.xml 的内容如下:

 

<?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:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="  
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd  
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd  
            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd  
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"
	default-autowire="byName" default-lazy-init="false">
	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url"
			value="jdbc:mysql://127.0.0.1:3306/yiibai?characterEncoding=utf8" />
		<property name="username" value="root" />
		<property name="password" value="" />
	</bean>

	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!--dataSource属性指定要用到的连接池-->
		<property name="dataSource" ref="dataSource" />
		<!--configLocation属性指定mybatis的核心配置文件-->
		<property name="configLocation" value="config/Configuration.xml" />
	</bean>

	<bean id="userMaper" class="org.mybatis.spring.mapper.MapperFactoryBean"> 
		<!--sqlSessionFactory属性指定要用到的SqlSessionFactory实例-->
		<property name="sqlSessionFactory" ref="sqlSessionFactory" />
		<!--mapperInterface属性指定映射器接口,用于实现此接口并生成映射器对象-->
		<property name="mapperInterface" value="com.yiibai.maper.UserMaper" />
	</bean>
</beans> 

UserMaper.xml 用于定义查询和数据对象映射,其内容如下:

 

<?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.yiibai.maper.UserMaper">
	
		<!-- 为了返回list 类型而定义的returnMap -->
	<resultMap type="User" id="resultUser">
        <id column="id" property="id" />
        <result column="username" property="username" />
        <result column="mobile" property="mobile" />
    </resultMap>
    
	<!-- User 联合 Order 查询 方法的配置 (多对一的方式)  -->	
	<resultMap id="resultUserOrders" type="Order">
	    <id property="orderId" column="order_id" />
	    <result property="orderNo" column="order_no" />
	    <result property="money" column="money" />
	    <result property="userId" column="user_id" />
	    
	    <association property="user" javaType="User">
	        <id property="id" column="id" />
	        <result property="username" column="username" />
	        <result property="mobile" column="mobile" />	        
	    </association>	    
	</resultMap> 
	
	<select id="getUserOrders" parameterType="int" resultMap="resultUserOrders">
	   SELECT u.*,o.* FROM `user` u, `order` o 
	          WHERE u.id=o.user_id AND u.id=#{id}
	</select>
	
	<select id="getUserById" resultMap="resultUser" parameterType="int">
		SELECT *
		FROM user
		WHERE id=#{id}
	</select>    
</mapper>

6、测试执行,输出结果

我们创建一个测试类为:Main.java , 就在 src 目录中。其代码如下:

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


import com.yiibai.maper.UserMaper;
import com.yiibai.pojo.Order;
import com.yiibai.pojo.User;

/**
 * Description
 * @author yiibai
 * @date 2015-4-12
 * @copyright http://www.yiibai.com
 * @email yiibai.com@gmai.com
 * @version 1.0
 */

public class Main {

	private static ApplicationContext ctx;

	static {
		ctx = new ClassPathXmlApplicationContext(
				"config/applicationContext.xml");
	}

	public static void main(String[] args) {
		UserMaper userMaper = (UserMaper) ctx.getBean("userMaper");
		// 测试id=1的用户查询,可根据数据库中的情况修改.
		User user = userMaper.getUserById(1);
		System.out.println("获取用户 ID=1 的用户名:"+user.getUsername());

		// 得到文章列表测试
		System.out.println("得到用户id为1的所有订单列表:");
		System.out.println("=============================================");
		List<Order> orders = userMaper.getUserOrders(1);

		for (Order order : orders) {
			System.out.println("订单号:"+order.getOrderNo() + ",订单金额:" + order.getMoney());
		}

	}

}

运行结果如下:

log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
获取用户 ID=1 的用户名:yiibai
得到用户id为1的所有订单列表:
=============================================
订单号:1509289090,订单金额:99.9
订单号:1519289091,订单金额:290.8
订单号:1509294321,订单金额:919.9
订单号:1601232190,订单金额:329.9
订单号:1503457384,订单金额:321.0
订单号:1598572382,订单金额:342.0
订单号:1500845727,订单金额:458.0
订单号:1508458923,订单金额:1200.0
订单号:1504538293,订单金额:2109.0
订单号:1932428723,订单金额:5888.0
订单号:2390423712,订单金额:3219.0
订单号:4587923992,订单金额:123.0
订单号:4095378812,订单金额:421.0
订单号:9423890127,订单金额:678.0
订单号:7859213249,订单金额:7689.0
订单号:4598450230,订单金额:909.2

Mybatis与Spring集成(易百教程)

标签:技术分享   cto   配置   sso   列表   enc   common   stat   erb   

原文地址:https://www.cnblogs.com/pingxin/p/p00015.html

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