百度百科：https://baike.baidu.com/item/MyBatis/2824918?fr=aladdin
1.创建数据库
image.png
2.创建数据库order表-执行语句
CREATE TABLE `order` (
`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` date 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_order_id` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
3.order表插入数据-执行语句
INSERT INTO `order` VALUES ('3', '1', '1000010', '2015-02-04 13:22:35', null);
INSERT INTO `order` VALUES ('4', '1', '1000011', '2015-02-03 13:22:41', null);
INSERT INTO `order` VALUES ('5', '10', '1000012', '2015-02-12 16:13:23', null);
4.创建数据库user表-执行语句
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;
5.user表插入数据-执行语句
INSERT INTO `user` VALUES ('1', '王五', null, '2', null);
INSERT INTO `user` VALUES ('10', '张三', '2014-07-10', '1', '北京市');
INSERT INTO `user` VALUES ('16', '张小明', null, '1', '河南郑州');
INSERT INTO `user` VALUES ('22', '陈小明', null, '1', '河南郑州');
INSERT INTO `user` VALUES ('24', '张三丰', null, '1', '河南郑州');
INSERT INTO `user` VALUES ('25', '陈小明', null, '1', '河南郑州');
INSERT INTO `user` VALUES ('26', '王五', null, null, null);
6.数据库表执行结果
7.Eclipse中创建Maven工程
image.png
8.添加compiler包
image.png
9.编辑pom.xml配置文件
image.png
10.创建model层User类
image.png
User类
package com.neuedu.mybatis1.model;
import java.util.Date;
public class User {
private int id;
private String username;
private Date birthday;
private String sex;
private String address;
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 Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", birthday=" + birthday + ", sex=" + sex
+ ", address=" + address + "]";
}
}
11.增加mysql包
image.png
12.创建SqlMapConfig.xml文件
image.png
13.导入MyBatis包
image.png
14.编辑SqlMapConfig.xml文件
15.创建config文件夹
config文件夹
16.创建log4j.properties日志文件
日志文件
17.编辑log4j.properties日志文件
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
日志文件
18.在config文件夹内创建UserMapper.xml文件
创建UserMapper.xml文件
19.编辑UserMapper.xml文件（重点）
- 查询方法
- 增加方法
- 删除方法
- 更新方法
insert into user values(null,#{username},#{birthday},#{sex},#{address})
select max(id) from user
insert into user values(null,#{username},#{birthday},#{sex},#{address})
delete from user where id = #{id}
update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} where id = #{id}
20.创建junit包
创建junit包
22.新建SessionFactoryUtil类
image.png
23.编辑SessionFactoryUtil文件
- 重点:单例模式
package com.neuedu.mybatis1.utils;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class SessionFactoryUtil {
//SqlSessionFactory是一个单例模式
//取得一个单例的SqlSessionFactory
public static SqlSessionFactory sf = null;
//静态代码块---加载类的时候执行的静态代码块
static{
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
InputStream is = null;
try {
is = Resources.getResourceAsStream("sqlMapConfig.xml");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
sf = builder.build(is);
}
public static SqlSessionFactory getSqlSessionFactory(){
return sf;
}
}
24.创建junit类型的文件UTest
image.png
25.编辑UTest文件
- 重点：方法名上方必须加@Test
- 创建SessionFactoryUtil文件之后，使用单例模式，在UTest里可以直接调用
- SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
- SqlSession sqlSession = factory.openSession();
- 注意最后需要进行提交事务和关闭
- sqlSession.commit(); 提交事务
- sqlSession.close();关闭
package test;
import java.io.IOException;
import java.util.Date;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.junit.Test;
import com.neuedu.mybatis1.model.User;
import com.neuedu.mybatis1.utils.SessionFactoryUtil;
public class UTest {
@Test
//保存测试用例：根据用户ID查询
public void testGetById() throws IOException {
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
//从工厂中创建连接
SqlSession sqlSession = factory.openSession();
User user = sqlSession.selectOne("user.getById",1);
System.out.println(user);
sqlSession.close();
}
@Test
public void testGetByUserName() throws IOException {
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
//从工厂中创建连接
SqlSession sqlSession = factory.openSession();
List list = sqlSession.selectList("user.getByUserName","小");
//关闭连接资源(放到连接池中)
for(User u:list)
System.out.println(u);
sqlSession.close();
}
@Test
public void testsave() throws IOException {
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
//从工厂中创建连接
SqlSession sqlSession = factory.openSession();
User user = new User();
user.setUsername("小王");
user.setBirthday(new Date());
user.setSex("男");
user.setAddress("辽宁铁岭");
sqlSession.insert("user.save",user);
//提交事务，默认是不提交
sqlSession.commit();
System.out.println(user);
sqlSession.close();
}
@Test
public void testsave2() throws IOException {
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
//从工厂中创建连接
SqlSession sqlSession = factory.openSession();
User user = new User();
user.setUsername("小王");
user.setBirthday(new Date());
user.setSex("男");
user.setAddress("辽宁铁岭");
sqlSession.insert("user.save2",user);
//提交事务，默认是不提交
sqlSession.commit();
System.out.println(user);
sqlSession.close();
}
@Test
public void testdelete() throws IOException {
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
SqlSession sqlSession = factory.openSession();
sqlSession.delete("user.delete",43);
sqlSession.commit();
sqlSession.close();
}
@Test
public void testupdate() throws IOException {
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
//从工厂中创建连接
SqlSession sqlSession = factory.openSession();
User user = sqlSession.selectOne("user.getById",24);
user.setUsername("小李");
user.setBirthday(new Date());
user.setSex("男");
user.setAddress("辽宁沈阳");
sqlSession.update("user.update",user);
//提交事务，默认是不提交
sqlSession.commit();
sqlSession.close();
}
}
26.创建OrderMapper.xml文件，编辑OrderMapper.xml文件。创建OTest文件，编辑OTest文件。在SqlMapConfig.xml添加xml文件路径(原理同User)
- 注意：因为Order是在数据库中是关键字(Order by)，所以在进行查询数据库中的order表时，应该将order加上单引号，注意是键盘Tab键的上方的单引号
- OrderMapper.xml
select max(id) from `order`
insert into `order` values(null,#{user_id},#{number},#{createtime},#{note})
delete from `order` where id = #{id}
update `order` set user_id=#{user_id},number=#{number},createtime=#{createtime},note=#{note} where id = #{id}
- OTest
package test;
import java.io.IOException;
import java.util.Date;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.junit.Test;
import com.neuedu.mybatis1.model.Order;
import com.neuedu.mybatis1.utils.SessionFactoryUtil;
public class OTest {
//增
@Test
public void insert() throws IOException{
//1.调用uil
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
//2.创建连接
SqlSession sqlSession = factory.openSession();
//3.创建对象
Order order = new Order();
//4.放入值
order.setUser_id(10);
order.setNumber("101101");
order.setCreatetime(new Date());
order.setNote("2544");
//5.调用方法
sqlSession.insert("or.insert",order);
//6.提交
sqlSession.commit();
//7.关闭
sqlSession.close();
}
//删
@Test
public void delete() throws IOException{
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
SqlSession sqlSession = factory.openSession();
sqlSession.delete("or.delete",3);
sqlSession.commit();
sqlSession.close();
}
//改
@Test
public void update() throws IOException{
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
SqlSession sqlSession = factory.openSession();
Order order = sqlSession.selectOne("or.select",4);
order.setUser_id(26);
order.setNumber("10145401");
order.setCreatetime(new Date());
order.setNote("2554");
//5.调用方法
sqlSession.update("or.update",order);
//6.提交
sqlSession.commit();
//7.关闭
sqlSession.close();
}
//查
@Test
public void select() throws IOException{
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
SqlSession sqlSession = factory.openSession();
Order order = sqlSession.selectOne("or.select",4);
System.out.println(order);
sqlSession.close();
}
@Test
//根据user_id查集合
public void selectList() throws IOException{
SqlSessionFactory factory = SessionFactoryUtil.getSqlSessionFactory();
SqlSession sqlSession = factory.openSession();
List list = sqlSession.selectList("or.selectList",10);
for(Order o:list){
System.out.println(o);
}
sqlSession.close();
}
}
- 在SqlMapConfig.xml新增xml文件路径