這篇文章主要介紹了Mybatis基于注解開啟使用二級緩存,文中通過示例代碼介紹的非常詳細，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,需要的朋友可以參考下
創(chuàng)新互聯(lián)專業(yè)為企業(yè)提供雅安網(wǎng)站建設(shè)、雅安做網(wǎng)站、雅安網(wǎng)站設(shè)計、雅安網(wǎng)站制作等企業(yè)網(wǎng)站建設(shè)、網(wǎng)頁設(shè)計與制作、雅安企業(yè)網(wǎng)站模板建站服務(wù)，十載雅安做網(wǎng)站經(jīng)驗，不只是建網(wǎng)站，更提供有價值的思路和整體網(wǎng)絡(luò)服務(wù)。
本文主要是補充一下Mybatis中基于注解的二級緩存的開啟使用方法。
1.在Mybatis的配置文件中開啟二級緩存
<?xml version="1.0" encoding="UTF-8" ?>
開啟緩存
2.領(lǐng)域類以及Dao
重慶分公司
重慶分公司
public class User implements Serializable{
private Integer userId;
private String userName;
private Date userBirthday;
private String userSex;
private String userAddress;
private List accounts;
省略get和set方法......
}
import com.example.domain.User;
import org.apache.ibatis.annotations.*;
import org.apache.ibatis.mapping.FetchType;
import java.util.List;
@CacheNamespace(blocking = true)
public interface UserDao {
/**
* 查找所有用戶
* @return
*/
@Select("select * from User")
@Results(id = "userMap",value = {@Result(id = true,column = "id",property = "userId"),
@Result(column = "username",property = "userName"),
@Result(column = "birthday",property = "userBirthday"),
@Result(column = "sex",property = "userSex"),
@Result(column = "address",property = "userAddress"),
@Result(column = "id",property = "accounts",many = @Many(select = "com.example.dao.AccountDao.findAccountByUid",fetchType = FetchType.LAZY))
})
List findAll();
/**
* 保存用戶
* @param user
*/
@Insert("insert into user(username,birthday,sex,address) values(#{username},#{birthday},#{sex},#{address})")
void saveUser(User user);
/**
* 更新用戶
* @param user
*/
@Update("update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} where id=#{id}")
void updateUser(User user);
/**
* 刪除用戶
* @param id
*/
@Delete("delete from user where id=#{id}")
void deleteUser(Integer id);
/**
* 查詢用戶根據(jù)ID
* @param id
* @return
*/
@Select("select * from user where id=#{id}")
@ResultMap(value = {"userMap"})
User findById(Integer id);
/**
* 根據(jù)用戶名稱查詢用戶
* @param name
* @return
*/
// @Select("select * from user where username like #{name}")
@Select("select * from user where username like '%${value}%'")
List findByUserName(String name);
/**
* 查詢用戶數(shù)量
* @return
*/
@Select("select count(*) from user")
int findTotalUser();
} 3.在對應(yīng)的Dao類上面增加注釋以開啟二級緩存
@CacheNamespace(blocking = true)
4.測試
public class UserCacheTest {
private InputStream in;
private SqlSessionFactory sqlSessionFactory;
@Before
public void init()throws Exception{
in = Resources.getResourceAsStream("SqlMapConfig.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
}
@After
public void destory()throws Exception{
in.close();
}
@Test
public void testFindById(){
//第一查詢
SqlSession sqlSession1 = sqlSessionFactory.openSession();
UserDao userDao1 = sqlSession1.getMapper(UserDao.class);
User user1 = userDao1.findById(41);
System.out.println(user1);
//關(guān)閉一級緩存
sqlSession1.close();
//第二次查詢
SqlSession sqlSession2 = sqlSessionFactory.openSession();
UserDao userDao2 = sqlSession2.getMapper(UserDao.class);
User user2 = userDao2.findById(41);
System.out.println(user2);
sqlSession1.close();
System.out.println(user1 == user2);
}
}（1）未開啟二級緩存時
（2）開啟二級緩存時
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。
