项目结构：
Menu
package com.mstf.dao;
import java.util.Scanner;
import org.apache.ibatis.session.SqlSession;
import com.mstf.util.MyBatisUtil;
public class Menu {
private static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
SqlSession session=MyBatisUtil.getSession();
System.out.println("请输入菜单选项：");
System.err.println("1.根据订单ID查询信息");
System.err.println("2.添加客户订单信息");
String id = sc.next();
if ("1".equals(id)) {
Table.table1();
} else if ("2".equals(id)) {
Table.table2();
} else {
System.err.println("非法操作：没有此选项！");
session.close();
}
}
}
Table
package com.mstf.dao;
import java.util.List;
import java.util.Scanner;
import org.apache.ibatis.session.SqlSession;
import com.mstf.entity.T_customer;
import com.mstf.entity.T_order;
import com.mstf.util.MyBatisUtil;
public class Table {
private static Scanner sc = new Scanner(System.in);
static SqlSession session=MyBatisUtil.getSession();
/**
* 根据订单 ID 查询
* @author wangzheng
*/
public static void table1(){
System.err.println("请输入订单ID：");
String bug=sc.next();
try {
List<T_order> list = session.selectList("getT_customerT_order",bug);
for (T_order t_order : list) {
System.out.println(t_order);
}
} finally {
session.commit();
session.close();
System.out.println("查询一条数据成功！如果没有数据显示，则为无此订单ID！");
}
}
/**
* 添加一条新数据
* @author wangzheng
*/
public static void table2(){
int customer_id=0;
System.out.println("请输入客户姓名：");
String name=sc.next();
System.out.println("请输入客户年龄：");
String age=sc.next();
System.out.println("请输入客户电话：");
String tel=sc.next();
System.out.println("请输入订单编号：");
String order_number=sc.next();
System.out.println("请输入订单价格：");
String order_price=sc.next();
try {
T_customer t_customer = new T_customer(0,name,age,tel);
T_order t_order = new T_order(0,order_number,order_price,customer_id);
session.insert("insert_T_customer",t_customer);
session.insert("insert_T_order",t_order);
} finally {
session.commit();
session.close();
System.out.println("添加数据成功！");
}
}
}
T_customer
package com.mstf.entity;
public class T_customer {
private int id;
private String name;
private String age;
private String tel;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getTel() {
return tel;
}
public void setTel(String tel) {
this.tel = tel;
}
public T_customer(int id, String name, String age, String tel) {
super();
this.id = id;
this.name = name;
this.age = age;
this.tel = tel;
}
public T_customer() {
super();
}
@Override
public String toString() {
return "订单客户：[客户ID：" + id + ", 姓名：" + name + ", 年龄：" + age + ", 电话：" + tel + "]";
}
}
T_order
package com.mstf.entity;
public class T_order {
private int id;
private String order_number;
private String order_price;
private T_customer t_customer;
private int customer_id;
public int getCustomer_id() {
return customer_id;
}
public void setCustomer_id(int customer_id) {
this.customer_id = customer_id;
}
public T_customer getT_customer() {
return t_customer;
}
public void setT_customer(T_customer t_customer) {
this.t_customer = t_customer;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getOrder_number() {
return order_number;
}
public void setOrder_number(String order_number) {
this.order_number = order_number;
}
public String getOrder_price() {
return order_price;
}
public void setOrder_price(String order_price) {
this.order_price = order_price;
}
public T_order(int id, String order_number, String order_price, int customer_id) {
super();
this.id = id;
this.order_number = order_number;
this.order_price = order_price;
this.customer_id = customer_id;
}
public T_order() {
super();
}
@Override
public String toString() {
return "系统订单：[订单ID：" + id + ", 订单号：" + order_number + ", 总价：" + order_price
+ "];
" + t_customer + "
";
}
}
T_customer.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.mstf.mapper">
<select id="getT_customerT_order" resultMap="T_customerT_order" parameterType="String">
SELECT * FROM t_customer tc,t_order t WHERE tc.id=t.customer_id and t.customer_id =#{t.customer_id}
</select>
<resultMap type="T_order" id="T_customerT_order">
<id column="id" property="id"/>
<result column="order_number" property="order_number"/>
<result column="order_price" property="order_price"/>
<association property="t_customer" javaType="T_customer">
<id column="id" property="id"/>
<result column="name" property="name"/>
<result column="age" property="age"/>
<result column="tel" property="tel"/>
</association>
</resultMap>
</mapper>
T_order.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.mstf.mapper">
<insert id="insert_T_customer">
insert into t_customer (name, age, tel) values (#{name}, #{age}, #{tel})
</insert>
<insert id="insert_T_order">
insert into t_order (order_number, order_price, customer_id) VALUES (#{order_number},#{order_price},(SELECT MAX(`id`) FROM `t_customer`))
</insert>
</mapper>
MyBatisUtil
package com.mstf.util;
import java.io.Reader;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MyBatisUtil {
// 去读取编写的 mybatis_config.xml 文件加载文件中的映射
public static SqlSession getSession() {
SqlSessionFactory ssf=null;
String url="mybatis_config.xml";
Reader reader=null;
try {
reader=Resources.getResourceAsReader(url);
} catch (Exception e) {
e.printStackTrace();
}
ssf=new SqlSessionFactoryBuilder().build(reader);
return ssf.openSession();
}
}
db.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://127.0.0.1/demo username=root password=root
log4j.properties
# 全局的日志配置 log4j.rootLogger = ERROR,stdout # MyBatis 的日志配置 log4j.logger.org.fkit.mapper.UserMapper=DEBUG # 控制台输出 log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
mybatis_config.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">
<!-- XML 配置文件包含对 MyBatis 系统的核心配置 -->
<configuration>
<!-- 加载数据库配置文件 -->
<properties resource="db.properties"/>
<!-- 指定 MyBatis 所用日志的具体实现 -->
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
<!-- 给实体类类取别名 -->
<typeAliases>
<typeAlias type="com.mstf.entity.T_customer" alias="T_customer"/>
<typeAlias type="com.mstf.entity.T_order" alias="T_order"/>
</typeAliases>
<!-- 环境配置，即连接数据库 -->
<environments default="mysql">
<environment id="mysql">
<!-- 指定事务管理类型， type="JDBC" 指直接简单使用了 JDBC 的提交和回滚设置 -->
<transactionManager type="JDBC"/>
<!-- dataScurce 指数据源配置， POOLED 是 JDBC 连接对象的数据源连接池的实现 -->
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<!-- mappers 告诉了 MyBatis 去哪里找持久化类的映射文件 -->
<mappers>
<mapper resource="com/mstf/mapper/T_customer.xml"/>
<mapper resource="com/mstf/mapper/T_order.xml"/>
</mappers>
</configuration>