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。工程结构目如下：
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
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());
}
}
}