1.mybatis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>
<!--- 配置環境-->
<environments default="mysql">
<!---配置mysql的環境-->
<environment id="mysql">
<!--- 配置事務的類型-->
<transactionManager type="JDBC"></transactionManager>
<!--- 配置數據源(連接池)-->
<dataSource type="POOLED">
<!--- 配置連接數據庫的4個基本信息-->
<!--property name="driver" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///test1?characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai"/>
<property name="username" value="root"/>
<property name="password" value="root"/> < 方式二 直接配置-->
</dataSource>
</environment>
</environments>
<!---指定映射配置文件的位置,映射配置文件指的是每個dao獨立的配置文件 -->
<mappers>
<mapper class="com.xatu.dao.IUserDao"></mapper> <!--select註釋方式 -->
</mappers>
</configuration>
關於url中&useSSL=false&serverTimezone=Asia/Shanghai
這一部分是由於我的mysql數據庫版本是8.0.16;如果不加這些會報錯。
2.User類
public class User implements Serializable {
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
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 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 + '\'' +
'}';
}
}
注意此類中的變量名要與數據庫中變量的名字一一對應
3.操作類:Dao接口
public interface IUserDao {
/*
查詢所有操作
*/
@Select("select * from user")
List<User> findAll();
/**
* 保存用戶
* @param user
*/
@Select("insert into user values(#{username},#{birthday},#{sex},#{address})")
void saveUser(User user);
/**
* 刪除用戶
*/
@Select("delete from user where id=47")
void delUser();
/**
* 查詢操作
* @return
*/
@Select("select * from user where id=46")
User selectUser();
/**
* 更新操作
*/
@Select("update user set username=#{username} where id=46")
void updateUser(User user);
}
4.測試類:
public class MybatisTest2 {
static SqlSession sqlSession=null;
static IUserDao dao=null;
static InputStream is=null;
@Before
public void init() throws IOException {
is = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();
SqlSessionFactory sqlSessionFactory = builder.build(is);
sqlSession = sqlSessionFactory.openSession();
dao = sqlSession.getMapper(IUserDao.class);
}
@After
public void destory() throws IOException {
sqlSession.commit();
sqlSession.close();
is.close();
}
@Test
public void testupdate() { //更新操作
User us=new User();
us.setUsername("小馬寶莉");
dao.updateUser(us);
}
@Test
public void testSelectAll(){ //查詢所有
List<User> users = dao.findAll();
for (User user :
users) {
System.out.println(user);
}
}
@Test
public void deleteUser(){ //刪除操作
dao.delUser();
}
@Test
public void saveUser(){
User user = dao.selectUser();
System.out.println(user);
}
}