标签:配置文件 support unicode 移动 连接 not inf static host
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
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。
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:
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‘);
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.tanlei.pojo 包中。
User.java代码内容如下:
package com.tanlei.pojo; /** * @author:Mr.Tan * @Create:2018-11-08-10-27 **/ 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.tanlei.pojo; /** * @author:Mr.Tan * @Create:2018-11-08-10-26 **/ public class Order { private int orderId; private String orderNo; private float money; private int userId; private User user; public int getOrderId() { return orderId; } public void setOrderId(int orderId) { this.orderId = orderId; } 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; } public int getUserId() { return userId; } public void setUserId(int userId) { this.userId = userId; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } }
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"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <!--init-method="init" destroy-method="close">spring 容器在初始化bean 和容器销毁之前的所做的操作--> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://127.0.0.1:3306/test?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/Configure.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.tanlei.mapper.UserMapper" /> </bean> </beans>
配置文件 Configuration.xml 的内容如下:
<?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标签 是写实体类的别名--> <typeAliases > <typeAlias alias="User" type="com.tanlei.pojo.User"></typeAlias> <typeAlias alias="Order" type="com.tanlei.pojo.Order"></typeAlias> </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"></transactionManager> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"></property> <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8"></property> <property name="username" value="root"></property> <property name="password" value="password"></property> </dataSource> </environment> </environments>--> <mappers> <!-- 注释掉咯... <mapper resource="mybatis/user.xml"></mapper>--> <mapper resource="com/tanlei/mapper/UserMapper.xml" /> </mappers> </configuration>
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.tanlei.mapper.UserMapper"> <!--为了返回list类型而定义的returnMap--> <!--id属性 ,resultMap标签的标识。 type属性 ,返回值的全限定类名,或类型别名。--> <resultMap id="resultUser" type="User"> <id property="id" column="id"></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> <!--根据用户id查找订单和用户信息--> <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> <!--根据用户id查找单个用户--> <select id="getUserById" parameterType="int" resultMap="resultUser"> SELECT * FROM user WHERE id=#{id} </select> </mapper>
我们创建一个测试类为:Main.java , 就在 src 目录中。其代码如下:
import com.tanlei.mapper.UserMapper; import com.tanlei.pojo.Order; import com.tanlei.pojo.User; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; /** * @author:Mr.Tan * @Create:2018-11-08-10-28 **/ public class Main { /* 从类路径ClassPath中寻找指定的XML配置文件,找到并装载 完成ApplicationContext的实例化工作。例如: //装载单个配置文件实例化ApplicationContext容器 ApplicationContext cxt = new ClassPathXmlApplicationContext("applicationContext.xml"); //装载多个配置文件实例化ApplicationContext容器 String[] configs = {"bean1.xml","bean2.xml","bean3.xml"}; ApplicationContext cxt = new ClassPathXmlApplicationContext(configs); */ private static ApplicationContext ctx; static { ctx=new ClassPathXmlApplicationContext("config/applicationContext.xml"); } public static void main(String[] args) { UserMapper userMapper= (UserMapper) ctx.getBean("userMapper"); // 测试id=1的用户查询,可根据数据库中的情况修改. User user =userMapper.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=userMapper.getUserOrders(1); for(Order order:orders){ System.out.println("订单号:"+order.getOrderNo() + ",订单金额:" + order.getMoney()); } } }
标签:配置文件 support unicode 移动 连接 not inf static host
原文地址:https://www.cnblogs.com/tanlei-sxs/p/9922591.html