第二天讲义地址
crud
注意事项
http://static.zhugexuetang.co...
1创建maven工程
2导入依赖
3编写SqlMapConfig.xml
类似于org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.itheima.dao.IUserDao.findById错误表示没在IUserDao.xml中配置查询的参数
Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.itheima.dao.IUserDao.findByQueryVo'. It's likely that neither a Result Type nor a Result Map was specified.
The error may exist in com/itheima/dao/IUserDao.xml
表示没有指定返回值的接收类型
SqlMapConfig.xml
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
IUserDao.xml
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
select last_insert_id();
insert into user(username,address,sex,birthday) values (#{userName},#{userAddress},#{userSex},#{userBirthday});
update user set username = #{userName},address=#{userAddress},sex=#{userSex},birthday=#{userBirthday} where id = #{userId};
delete from user where id = #{id};
已上代码中只有通过id去查的SQL在更改User类的属性名的时候不需要再sql语句里边体现
User.java
package com.itheima.domain;
import java.io.Serializable;
import java.util.Date;
public class User implements Serializable {
/\*private Integer id; private String username; private Date birthday; private String address; private String sex;
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 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; }
public String getSex() { return sex; }
public void setSex(String sex) { this.sex = sex; }
@Override public String toString() { return "User{" + "id=" + id + ", username='" + username + '\'' + ", birthday=" + birthday + ", address='" + address + '\'' + ", sex='" + sex + '\'' + '}'; }*/ private Integer userId;
private String userName;
private Date userBirthday;
private String userAddress;
private String userSex;
public Integer getUserId() {
return userId; }
public void setUserId(Integer userId) {
this.userId \= userId; }
public String getUserName() {
return userName; }
public void setUserName(String userName) {
this.userName \= userName; }
public Date getUserBirthday() {
return userBirthday; }
public void setUserBirthday(Date userBirthday) {
this.userBirthday \= userBirthday; }
public String getUserAddress() {
return userAddress; }
public void setUserAddress(String userAddress) {
this.userAddress \= userAddress; }
public String getUserSex() {
return userSex; }
public void setUserSex(String userSex) {
this.userSex \= userSex; }
@Override public String toString() {
return "User{" +
"userId=" \+ userId +
", userName='" \+ userName \+ '\\'' +
", userBirthday=" \+ userBirthday +
", userAddress='" \+ userAddress \+ '\\'' +
", userSex='" \+ userSex \+ '\\'' +
'}'; }
}
IUserDao.java
package com.itheima.dao;
import com.itheima.domain.QueryVo;
import com.itheima.domain.User;
import java.util.List;
public interface IUserDao {
/\*\* * 查询所有用户
*/
List
/**
* 添加用户
*/
void saveUser(User user);
/**
* 修改用户
*/
void updateUser(User user);
/**
* 删除用户
* @param id
*/
void deleteUser(Integer id);
/**
* 查找的单个用户
* @param id
* @return
*/
User findById(Integer id);
/**
* 根据用户名模糊查询
* @param username
* @return
*/
List
/**
* 总用户数
* @return
*/
int total();
/**
* 封装查询条件到对象
* @param q
* @return
*/
List
}
MybatisTest.java
package com.itheima.test;
import com.itheima.dao.IUserDao;
import com.itheima.domain.QueryVo;
import com.itheima.domain.User;
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.After;
import org.junit.Before;
import org.junit.Test;
import javax.jws.soap.SOAPBinding;
import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
public class MybatisTest {
private InputStream in; private SqlSession sqlSession;
private IUserDao userDao;
/**
* 在测试方法前执行
* @throws IOException
*/ @Before
public void init () throws IOException {
//读取配置文件 in = Resources.getResourceAsStream("SqlMapConfig.xml");
//获取SqlSessionFactory
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
//获取SqlSession对象
sqlSession = factory.openSession();
//获取userDao代理对象
userDao = sqlSession.getMapper(IUserDao.class);
}
/\*\* * 在测试方法后执行
*/
@After
public void destroy() throws IOException {
sqlSession.commit(); sqlSession.close();
in.close();
}
@Test public void testFindAll(){
List list = userDao.findAll(); for(User user:list){
System.out.println(user); }
}
@Test public void testSaveUser(){
User user = new User(); user.setUserName("张三");
user.setUserAddress("北京.和平路");
user.setUserSex("男");
user.setUserBirthday(new Date());
System.out.println("操作添加之前:"+user);
userDao.saveUser(user);
System.out.println("操作添加之后:"+user);
}
@Test public void testUpdateUser() throws ParseException {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); Date date = dateFormat.parse("1992-08-09 12:00:09");
User user = new User();
user.setUserId(51);
user.setUserName("张三x");
user.setUserAddress("南京鼓楼");
user.setUserSex("男");
user.setUserBirthday(date);
System.out.println("操作添加之前:"+user);
userDao.updateUser(user);
System.out.println("操作添加之后:"+user);
}
@Test public void testDeleteUser(){
User user = new User(); userDao.deleteUser(51);
}
@Test public void testFindById(){
User user = userDao.findById(51); System.out.println(user);
}
@Test public void testFindByUsername(){
List list = userDao.findByUsername("%小%"); for (User user : list){
System.out.println(user); }
}
@Test public void testTotal(){
int count = userDao.total(); System.out.println(count);
}
@Test public void testFindByQueryVo(){
QueryVo query = new QueryVo(); User user = new User();
user.setUserName("%王%");
query.setUser(user);
List
for (User u:list){
System.out.println(u); }
} }