标签：文件名 info address create 需要 auto property exist 工程
创建mybatis数据库,运行以下sql语句
/* SQLyog Ultimate v8.32 MySQL - 5.5.27 : Database - mybatis ********************************************************************* */ /*!40101 SET NAMES utf8 */; /*!40101 SET SQL_MODE=‘‘*/; /*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */; /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */; /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE=‘NO_AUTO_VALUE_ON_ZERO‘ */; /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */; /*Table structure for table `items` */ DROP TABLE IF EXISTS `items`; CREATE TABLE `items` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(32) NOT NULL COMMENT ‘商品名称‘, `price` float(10,1) NOT NULL COMMENT ‘商品定价‘, `detail` text COMMENT ‘商品描述‘, `pic` varchar(64) DEFAULT NULL COMMENT ‘商品图片‘, `createtime` datetime NOT NULL COMMENT ‘生产日期‘, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8; /*Data for the table `items` */ insert into `items`(`id`,`name`,`price`,`detail`,`pic`,`createtime`) values (1,‘台式机‘,3333.0,‘该电脑质量非常好！！！！‘,‘‘,‘2015-01-01 00:00:00‘),(2,‘笔记本‘,6000.0,‘笔记本性能好，质量好！！！！！‘,NULL,‘2015-02-09 13:22:57‘),(3,‘背包‘,200.0,‘名牌背包，容量大质量好！！！！‘,NULL,‘2015-02-06 13:23:02‘); /*Table structure for table `orderdetail` */ DROP TABLE IF EXISTS `orderdetail`; CREATE TABLE `orderdetail` ( `id` int(11) NOT NULL AUTO_INCREMENT, `orders_id` int(11) NOT NULL COMMENT ‘订单id‘, `items_id` int(11) NOT NULL COMMENT ‘商品id‘, `items_num` int(11) DEFAULT NULL COMMENT ‘商品购买数量‘, PRIMARY KEY (`id`), KEY `FK_orderdetail_1` (`orders_id`), KEY `FK_orderdetail_2` (`items_id`), CONSTRAINT `FK_orderdetail_1` FOREIGN KEY (`orders_id`) REFERENCES `orders` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION, CONSTRAINT `FK_orderdetail_2` FOREIGN KEY (`items_id`) REFERENCES `items` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8; /*Data for the table `orderdetail` */ insert into `orderdetail`(`id`,`orders_id`,`items_id`,`items_num`) values (1,3,1,1),(2,3,2,3),(3,4,3,4),(4,4,2,3); /*Table structure for table `orders` */ DROP TABLE IF EXISTS `orders`; CREATE TABLE `orders` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL COMMENT ‘下单用户id‘, `number` varchar(32) NOT NULL COMMENT ‘订单号‘, `createtime` datetime NOT NULL COMMENT ‘创建订单时间‘, `note` varchar(100) DEFAULT NULL COMMENT ‘备注‘, PRIMARY KEY (`id`), KEY `FK_orders_1` (`user_id`), CONSTRAINT `FK_orders_id` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8; /*Data for the table `orders` */ insert into `orders`(`id`,`user_id`,`number`,`createtime`,`note`) values (3,1,‘1000010‘,‘2015-02-04 13:22:35‘,NULL),(4,1,‘1000011‘,‘2015-02-03 13:22:41‘,NULL),(5,10,‘1000012‘,‘2015-02-12 16:13:23‘,NULL); /*Table structure for table `user` */ DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(32) NOT NULL COMMENT ‘用户名称‘, `birthday` date DEFAULT NULL COMMENT ‘生日‘, `sex` char(1) DEFAULT NULL COMMENT ‘性别‘, `address` varchar(256) DEFAULT NULL COMMENT ‘地址‘, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=27 DEFAULT CHARSET=utf8; /*Data for the table `user` */ insert into `user`(`id`,`username`,`birthday`,`sex`,`address`) values (1,‘王五‘,NULL,‘2‘,NULL),(10,‘张三‘,‘2014-07-10‘,‘1‘,‘北京市‘),(16,‘张小明‘,NULL,‘1‘,‘河南郑州‘),(22,‘陈小明‘,NULL,‘1‘,‘河南郑州‘),(24,‘张三丰‘,NULL,‘1‘,‘河南郑州‘),(25,‘陈小明‘,NULL,‘1‘,‘河南郑州‘),(26,‘王五‘,NULL,NULL,NULL); /*!40101 SET SQL_MODE=@OLD_SQL_MODE */; /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */; /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */; /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
创建工程包结构,以及导入jar包
log4j的配置文件
### direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.err log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### direct messages to file mylog.log ### log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.File=d:/mylog.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### set log levels - for more verbose logging change ‘info‘ to ‘debug‘ ### log4j.rootLogger=debug, stdout
db.properties数据库连接配置文件
jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/mybatis jdbc.username=root jdbc.password=123
SqlMapConfig.xml全局的配置文件,mybatis必须的配置文件
<?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> <properties resource="db.properties"> </properties> <typeAliases> <!-- 批量别名定义，扫描整个包下的类，别名为类名（大小写不敏感） --> <package name="com.baoyuan.mybatis"/> </typeAliases> <!--名称随意 --> <environments default="development"> <!--id必须和上面的一致 --> <environment id="development"> <!--固定格式JDBC --> <transactionManager type="JDBC"></transactionManager> <dataSource type="POOLED"> <property name="driver" value="${jdbc.driverClassName}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </dataSource> </environment> </environments> <mappers> <!-- 注意：此种方法要求mapper接口名称和mapper映射文件名称相同，且放在同一个目录中。 --> <package name="com.baoyuan.mybatis.mapper"/> </mappers> </configuration>
user这个pojo类
package com.baoyuan.mybatis.pojo; import java.util.Date; import java.util.List; public class User { private Integer id; private String username;// 用户姓名 private String sex;// 性别 private Date birthday;// 生日 private String address;// 地址 private List<Order> orders; public List<Order> getOrders() { return orders; } public void setOrders(List<Order> orders) { this.orders = orders; } 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 getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return "User [id=" + id + ", username=" + username + ", sex=" + sex + ", birthday=" + birthday + ", address=" + address + ", orders=" + orders + "]"; } }
user和order一对多关联查询使用resultType方式定义的pojo类
package com.baoyuan.mybatis.pojo; import java.util.Date; public class UserOrder extends User{ private String number; private Date createtime; private String note; public String getNumber() { return number; } public void setNumber(String number) { this.number = number; } public Date getCreatetime() { return createtime; } public void setCreatetime(Date createtime) { this.createtime = createtime; } public String getNote() { return note; } public void setNote(String note) { this.note = note; } @Override public String toString() { return "UserOrder ["+super.toString()+"number=" + number + ", createtime=" + createtime + ", note=" + note + "]"; } }
user进行xml(<if><foreach><where>等)标签使用测试用到的pojo类
package com.baoyuan.mybatis.pojo; import java.util.List; public class UserWarp { private User user; private List<Integer> ids; public List<Integer> getIds() { return ids; } public void setIds(List<Integer> ids) { this.ids = ids; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } @Override public String toString() { return "UserWarp [user=" + user + ", ids=" + ids + "]"; } }
user 的mapper接口
package com.baoyuan.mybatis.mapper; import java.util.List; import com.baoyuan.mybatis.pojo.User; import com.baoyuan.mybatis.pojo.UserOrder; import com.baoyuan.mybatis.pojo.UserWarp; public interface UserMapper { public User findUserById(Integer id); public List<User> findUserByusername(String username); public List<User> findUserByWhere(User user); //select * from user wehre id in (1,3,5) public List<User> findUserByIds(UserWarp userWarp); //查询所有 public List<User> findUserByAll(); //查询用户及其下的订单详情 public List<UserOrder> findUserOrdersById(Integer id); public List<User> findUserOrdersByIdToMap(Integer id); }
UserMapper.xml配置文件
<?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.baoyuan.mybatis.mapper.UserMapper"> <select id="findUserById" parameterType="int" resultType="user"> select * from user where id =#{id} </select> <select id="findUserByusername" parameterType="java.lang.String" resultType="user"> select * from user where username like ‘%${value}%‘ </select> <select id="findUserByWhere" parameterType="user" resultType="user"> select * from user <!-- where 自动去掉第一个and --> <where> <!--判断然后添加条件 --> <if test="id != null and id != ‘‘"> and id =#{id} </if> <if test="username != null and username != ‘‘"> and username like ‘%${username}%‘ </if> </where> </select> <!-- 使用包装类型查询用户 使用ognl从对象中取属性值，如果是包装对象可以使用【属性.XXX.XXX】来取内容的属性 --> <select id="findUserByWarp" parameterType="userWarp" resultType="user"> select * from user where username like ${user.username} </select> <!--查询Id为(1,3,5)的用户 select * from user where id in (1,2,3) --> <select id="findUserByIds" parameterType="userWarp" resultType="user"> select * from user <where> <!--如果Ids不为null,并且部位‘‘ --> <if test="ids!=null"> <!-- open:表示用什么开始 close:表示用什么结束 separator:表示用什么分割 --> <foreach collection="ids" open="and id in (" close=")" separator="," item="id"> #{id} </foreach> </if> </where> </select> <select id="findUserByAll" resultType="user"> <!--include 表示运哪个sql片段 注意：如果引用其它mapper.xml的sql片段，则在引用时需要加上namespace，如下：<include refid="namespace.sql片段”/> --> <include refid="query_all" /> user </select> <!--sql片段的抽取 --> <sql id="query_all"> select * from </sql> <!--set自动去掉多余的,为null和‘‘就不进行更新 --> <update id="updateUserByWhere" parameterType="user"> update ‘user‘ <set> <if test="username!=null and username !=‘‘"> username=#{username} </if> <if test="sex!=null and sex !=‘‘"> sex=#{sex} </if> <if test="address!=null and address !=‘‘"> address=#{address} </if> <if test="birthday!=null and birthday!=‘‘"> birthday=#{birthday} </if> </set> where id =#{id} </update> <!--一对多关联查询 :查询用户及其下的订单详情 --> <select id="findUserOrdersById" resultType="UserOrder" parameterType="int"> SELECT u.*, o.id , o.createtime, o.note, o.number FROM `user` u LEFT JOIN `order` o ON u.id = o.user_id WHERE u.id=#{id} </select> <resultMap type="user" id="find_user_order_byid"> <!-- 用户信息映射 --> <id property="id" column="id"/> <result property="username" column="username"/> <result property="birthday" column="birthday"/> <result property="sex" column="sex"/> <result property="address" column="address"/> <!-- 一对多关联映射 property;表示属性名称 ofType:表示映射的类的全路径,这里写的是别名 --> <collection property="orders" ofType="order"> <!--用户id已经在user对象中存在，此处可以不设置--> <!-- <result property="userId" column="id"/> --> <result property="number" column="number"/> <result property="createtime" column="createtime"/> <result property="note" column="note"/> </collection> </resultMap> <!--一对多关联查询 :查询用户及其下的订单详情 ,使用resultMap --> <select id="findUserOrdersByIdToMap" resultMap="find_user_order_byid" parameterType="int"> SELECT u.*, o.id , o.createtime, o.note, o.number FROM `user` u LEFT JOIN `order` o ON u.id = o.user_id WHERE u.id=#{id} </select> </mapper>
user的测试代码
package com.baoyuan.mybatis.test; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Before; import org.junit.Test; import com.baoyuan.mybatis.mapper.OrderMapper; import com.baoyuan.mybatis.mapper.UserMapper; import com.baoyuan.mybatis.pojo.User; import com.baoyuan.mybatis.pojo.UserOrder; import com.baoyuan.mybatis.pojo.UserWarp; public class TestUserMapper { private SqlSessionFactory sqlSessionFactory; //在运行test之前给sqlsessionfactory 赋值 @Before public void init() throws IOException{ SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder(); InputStream inputStream=Resources.getResourceAsStream("SqlMapConfig.xml"); this.sqlSessionFactory= builder.build(inputStream); } //根据Id查询用户 @Test public void findUserById(){ SqlSession sqlSession=null; try { sqlSession = sqlSessionFactory.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); User user = mapper.findUserById(1); System.out.println(user); } catch (Exception e) { e.printStackTrace(); }finally{ if(sqlSession!=null){ sqlSession.close(); } } } //根据用户名模糊查询 @Test public void findUserByusername(){ SqlSession sqlSession=null; try { sqlSession = sqlSessionFactory.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); List<User> list = mapper.findUserByusername("王"); System.out.println(list); } catch (Exception e) { e.printStackTrace(); }finally{ if(sqlSession!=null){ sqlSession.close(); } } } //根据不同条件查询 @Test public void findUserByWhere(){ SqlSession sqlSession=null; try { sqlSession = sqlSessionFactory.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); User user=new User(); user.setId(1); user.setUsername("狗"); List<User> list = mapper.findUserByWhere(user); System.out.println(list); } catch (Exception e) { e.printStackTrace(); }finally{ if(sqlSession!=null){ sqlSession.close(); } } } //根据一堆id查询是这些id的用户 @Test public void findUserByIds(){ SqlSession sqlSession=null; try { sqlSession = sqlSessionFactory.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); UserWarp userWarp=new UserWarp(); List<Integer> ids=new ArrayList<>(); ids.add(1); ids.add(3); ids.add(5); userWarp.setIds(ids); List<User> list = mapper.findUserByIds(userWarp); System.out.println(list); } catch (Exception e) { e.printStackTrace(); }finally{ if(sqlSession!=null){ sqlSession.close(); } } } //查询所有用户 @Test public void findUserByAll(){ SqlSession sqlSession=null; try { sqlSession = sqlSessionFactory.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); List<User> list = mapper.findUserByAll(); System.out.println(list); } catch (Exception e) { e.printStackTrace(); }finally{ if(sqlSession!=null){ sqlSession.close(); } } } //查询用户及其下的订单详情 @Test public void findUserOrdersById(){ SqlSession sqlSession=null; try { sqlSession = sqlSessionFactory.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); List<UserOrder> list = mapper.findUserOrdersById(1); System.out.println(list); } catch (Exception e) { e.printStackTrace(); }finally{ if(sqlSession!=null){ sqlSession.close(); } } } //查询用户及其下的订单详情 @Test public void findUserOrdersByIdToMap(){ SqlSession sqlSession=null; try { sqlSession = sqlSessionFactory.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); List<User> list = mapper.findUserOrdersByIdToMap(1); System.out.println(list); } catch (Exception e) { e.printStackTrace(); }finally{ if(sqlSession!=null){ sqlSession.close(); } } } }
下面是关于订单的
order的pojo类
package com.baoyuan.mybatis.pojo; import java.util.Date; public class Order { private Integer id; private Integer userId; private String number; private Date createtime; private String note; private User user; public User getUser() { return user; } public void setUser(User user) { this.user = user; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public Integer getUserId() { return userId; } public void setUserId(Integer userId) { this.userId = userId; } public String getNumber() { return number; } public void setNumber(String number) { this.number = number == null ? null : number.trim(); } public Date getCreatetime() { return createtime; } public void setCreatetime(Date createtime) { this.createtime = createtime; } public String getNote() { return note; } public void setNote(String note) { this.note = note == null ? null : note.trim(); } @Override public String toString() { return "Order [id=" + id + ", userId=" + userId + ", number=" + number + ", createtime=" + createtime + ", note=" + note + "]"; } }
一对一查询订单和对应用户用到的pojo
package com.baoyuan.mybatis.pojo; public class OrderToUser extends Order{ private String username; private String address; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return super.toString()+"OrderToUser [username=" + username + ", address=" + address + "]"; } }
order定义的mapper接口
package com.baoyuan.mybatis.mapper; import com.baoyuan.mybatis.pojo.Order; import com.baoyuan.mybatis.pojo.OrderToUser; public interface OrderMapper { public OrderToUser findOrderUserById(Integer id); public Order findOrderByIdToMap(Integer id); public Order findOrderUserByIdToMap(Integer id); }
order的mybatis配置文件
<?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.baoyuan.mybatis.mapper.OrderMapper"> <!--关联查询:查询对应订单详情和用户名,用户地址运用resultType --> <select id="findOrderUserById" parameterType="int" resultType="com.baoyuan.mybatis.pojo.OrderToUser"> SELECT o.*, u.username, u.address FROM `order` o, `user` u WHERE o.user_id = u.id AND o.id =#{id} </select> <resultMap type="order" id="find_order_resultMap"> <!-- 定义单表查询列名和pojo属性名相同可以不写 --> <!-- <id column="id" property="id"/> --> <result column="user_id" property="userId"/> </resultMap> <!--一对一关联查询时:查询对应订单详情和用户名,用户地址,发现userid为null,原因:数据库列名与pojo类的属性名不一样 ,所以用resultMap --> <select id="findOrderByIdToMap" parameterType="int" resultMap="find_order_resultMap" > select * from `order` where id =#{id} </select> <!--关联查询的所有字段都要写 ,先要在order中要有User的引用属性 --> <resultMap type="order" id="find_order_user_byid"> <id column="id" property="id"/> <result column="user_id" property="userId"/> <result column="number" property="number"/> <result column="createtime" property="createtime"/> <result column="note" property="note"/> <association property="user" javaType="com.baoyuan.mybatis.pojo.User"> <!-- 一对一关联映射 --> <!-- property:Orders对象的user属性 javaType：user属性对应 的类型 --> <id column="user_id" property="id"/> <result column="username" property="username"/> <result column="address" property="address"/> <result column="sex" property="sex"/> <result column="birthday" property="birthday"/> </association> </resultMap> <!--一对一关联查询:查询对应订单详情和用户名,用户地址运用resultMap --> <select id="findOrderUserByIdToMap" parameterType="int" resultMap="find_order_user_byid"> SELECT o.*, u.username, u.address FROM `order` o, `user` u WHERE o.user_id = u.id AND o.id =#{id} </select> </mapper>
oreer订单的测试代码
package com.baoyuan.mybatis.test; import java.io.IOException; import java.io.InputStream; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Before; import org.junit.Test; import com.baoyuan.mybatis.mapper.OrderMapper; import com.baoyuan.mybatis.pojo.Order; import com.baoyuan.mybatis.pojo.OrderToUser; public class TestOrderMapper { private SqlSessionFactory sqlSessionFactory; @Before public void init() throws IOException{ SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder(); InputStream inputStream=Resources.getResourceAsStream("SqlMapConfig.xml"); this.sqlSessionFactory= builder.build(inputStream); } //查询订单及用户 @Test public void findOrderUserById(){ SqlSession sqlSession=null; try { //获取sqlsesison sqlSession = sqlSessionFactory.openSession(); //获取mapper代理类 OrderMapper mapper = sqlSession.getMapper(OrderMapper.class); OrderToUser orderToUser = mapper.findOrderUserById(3); System.out.println(orderToUser); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } finally{ if(sqlSession!=null){ sqlSession.close(); } } } //根据resultMap查询订单 @Test public void findOrderByIdToMap(){ SqlSession sqlSession=null; try { //获取sqlsesison sqlSession = sqlSessionFactory.openSession(); //获取mapper代理类 OrderMapper mapper = sqlSession.getMapper(OrderMapper.class); Order order = mapper.findOrderByIdToMap(3); System.out.println(order); } catch (Exception e) { e.printStackTrace(); } finally{ if(sqlSession!=null){ sqlSession.close(); } } } //根据resultMap查询订单及用户 @Test public void findOrderUserByIdToMap(){ SqlSession sqlSession=null; try { //获取sqlsesison sqlSession = sqlSessionFactory.openSession(); //获取mapper代理类 OrderMapper mapper = sqlSession.getMapper(OrderMapper.class); Order order = mapper.findOrderUserByIdToMap(3); System.out.println(order); } catch (Exception e) { e.printStackTrace(); } finally{ if(sqlSession!=null){ sqlSession.close(); } } } }
注意点:dtd约束是有顺序的
关联查询的配置:
当POJO中属性名和查询的列名不一致的时候使用resultmap比较多。
当POJO中的属性名和查询的列名一致的时候，是使用resutltype.(推荐使用)
mybatis的动态sql编写以及一对一关系查询和一对多的查询
标签：文件名 info address create 需要 auto property exist 工程
原文地址：http://www.cnblogs.com/jiangxiangit/p/7261032.html
