mybatis注解開發(fā)的環(huán)境搭建
- pom.xml and SqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.itheima</groupId>
<artifactId>day04_eesy_03annotation_mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
</dependencies>
</project>
<?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>
<!-- 引入外部配置文件-->
<properties resource="jdbcConfig.properties"></properties>
<!--配置別名-->
<typeAliases>
<package name="com.itheima.domain"></package>
</typeAliases>
<!-- 配置環(huán)境-->
<environments default="mysql">
<environment id="mysql">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</dataSource>
</environment>
</environments>
<!-- 指定帶有注解的dao接口所在位置 -->
<mappers>
<mapper class="com.itheima.dao.IUserDao"></mapper>
</mappers>
</configuration>
- User.java and IUserDao.java
package com.itheima.domain;
import java.io.Serializable;
import java.util.Date;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public class User implements Serializable{
private Integer id;
private String username;
private String address;
private String sex;
private Date birthday;
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 getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
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;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", address='" + address + '\'' +
", sex='" + sex + '\'' +
", birthday=" + birthday +
'}';
}
}
package com.itheima.dao;
import com.itheima.domain.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
* 在mybatis中針對,CRUD一共有四個(gè)注解
* @Select @Insert @Update @Delete
*/
public interface IUserDao {
/**
* 查詢所有用戶
* @return
*/
@Select("select * from user")
List<User> findAll();
}
mybatis注解開發(fā)測試和使用注意事項(xiàng)
package com.itheima.test;
import com.itheima.dao.IUserDao;
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 java.io.InputStream;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public class MybatisAnnoTest {
/**
* 測試基于注解的mybatis使用
* @param args
*/
public static void main(String[] args) throws Exception{
//1.獲取字節(jié)輸入流
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//2.根據(jù)字節(jié)輸入流構(gòu)建SqlSessionFactory
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
//3.根據(jù)SqlSessionFactory生產(chǎn)一個(gè)SqlSession
SqlSession session = factory.openSession();
//4.使用SqlSession獲取Dao的代理對象
IUserDao userDao = session.getMapper(IUserDao.class);
//5.執(zhí)行Dao的方法
List<User> users = userDao.findAll();
for(User user : users){
System.out.println(user);
}
//6.釋放資源
session.close();
in.close();
}
}
mybatis注解開發(fā)保存和更新功能
package com.itheima.dao;
import com.itheima.domain.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
* 在mybatis中針對,CRUD一共有四個(gè)注解
* @Select @Insert @Update @Delete
*/
public interface IUserDao {
/**
* 查詢所有用戶
* @return
*/
@Select("select * from user")
List<User> findAll();
/**
* 保存用戶
* @param user
*/
@Insert("insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday})")
void saveUser(User user);
/**
* 更新用戶
* @param user
*/
@Update("update user set username=#{username},sex=#{sex},birthday=#{birthday},address=#{address} where id=#{id}")
void updateUser(User user);
}
package com.itheima.test;
import com.itheima.dao.IUserDao;
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 java.io.InputStream;
import java.util.Date;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public class AnnotationCRUDTest {
private InputStream in;
private SqlSessionFactory factory;
private SqlSession session;
private IUserDao userDao;
@Before
public void init()throws Exception{
in = Resources.getResourceAsStream("SqlMapConfig.xml");
factory = new SqlSessionFactoryBuilder().build(in);
session = factory.openSession();
userDao = session.getMapper(IUserDao.class);
}
@After
public void destroy()throws Exception{
session.commit();
session.close();
in.close();
}
@Test
public void testSave(){
User user = new User();
user.setUsername("mybatis annotation");
user.setAddress("北京市昌平區(qū)");
userDao.saveUser(user);
}
@Test
public void testUpdate(){
User user = new User();
user.setId(57);
user.setUsername("mybatis annotation update");
user.setAddress("北京市海淀區(qū)");
user.setSex("男");
user.setBirthday(new Date());
userDao.updateUser(user);
}
}
mybatis注解開發(fā)CRUD和其他操作
/**
* 刪除用戶
* @param userId
*/
@Delete("delete from user where id=#{id} ")
void deleteUser(Integer userId);
/**
* 根據(jù)id查詢用戶
* @param userId
* @return
*/
@Select("select * from user where id=#{id} ")
User findById(Integer userId);
/**
* 根據(jù)用戶名稱模糊查詢
* @param username
* @return
*/
// @Select("select * from user where username like #{username} ")
@Select("select * from user where username like '%${value}%' ")
List<User> findUserByName(String username);
/**
* 查詢總用戶數(shù)量
* @return
*/
@Select("select count(*) from user ")
int findTotalUser();
@Test
public void testDelete(){
userDao.deleteUser(51);
}
@Test
public void testFindOne(){
User user = userDao.findById(57);
System.out.println(user);
}
@Test
public void testFindByName(){
// List<User> users = userDao.findUserByName("%mybatis%");
List<User> users = userDao.findUserByName("mybatis");
for(User user : users){
System.out.println(user);
}
}
@Test
public void testFindTotal(){
int total = userDao.findTotalUser();
System.out.println(total);
}
mybatis注解建立實(shí)體類屬性和數(shù)據(jù)庫表中列的對應(yīng)關(guān)系
package com.itheima.domain;
import java.io.Serializable;
import java.util.Date;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public class User implements Serializable{
private Integer userId;
private String userName;
private String userAddress;
private String userSex;
private Date userBirthday;
public void setAccounts(List<Account> accounts) {
this.accounts = accounts;
}
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 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;
}
public Date getUserBirthday() {
return userBirthday;
}
public void setUserBirthday(Date userBirthday) {
this.userBirthday = userBirthday;
}
@Override
public String toString() {
return "User{" +
"userId=" + userId +
", userName='" + userName + '\'' +
", userAddress='" + userAddress + '\'' +
", userSex='" + userSex + '\'' +
", userBirthday=" + userBirthday +
'}';
}
}
package com.itheima.dao;
import com.itheima.domain.User;
import org.apache.ibatis.annotations.*;
import org.apache.ibatis.mapping.FetchType;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
* 在mybatis中針對,CRUD一共有四個(gè)注解
* @Select @Insert @Update @Delete
*/
public interface IUserDao {
/**
* 查詢所有用戶
* @return
*/
@Select("select * from user")
@Results(id="userMap",value={
@Result(id=true,column = "id",property = "userId"),
@Result(column = "username",property = "userName"),
@Result(column = "address",property = "userAddress"),
@Result(column = "sex",property = "userSex"),
@Result(column = "birthday",property = "userBirthday"),
})
List<User> findAll();
/**
* 根據(jù)id查詢用戶
* @param userId
* @return
*/
@Select("select * from user where id=#{id} ")
@ResultMap("userMap")
User findById(Integer userId);
/**
* 根據(jù)用戶名稱模糊查詢
* @param username
* @return
*/
@Select("select * from user where username like #{username} ")
@ResultMap("userMap")
List<User> findUserByName(String username);
}
mybatis注解開發(fā)一對一的查詢配置
package com.itheima.domain;
import java.io.Serializable;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public class Account implements Serializable {
private Integer id;
private Integer uid;
private Double money;
//多對一（mybatis中稱之為一對一）的映射：一個(gè)賬戶只能屬于一個(gè)用戶
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 getUid() {
return uid;
}
public void setUid(Integer uid) {
this.uid = uid;
}
public Double getMoney() {
return money;
}
public void setMoney(Double money) {
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", uid=" + uid +
", money=" + money +
'}';
}
}
package com.itheima.dao;
import com.itheima.domain.Account;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.mapping.FetchType;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public interface IAccountDao {
/**
* 查詢所有賬戶誓沸，并且獲取每個(gè)賬戶所屬的用戶信息
* @return
*/
@Select("select * from account")
@Results(id="accountMap",value = {
@Result(id=true,column = "id",property = "id"),
@Result(column = "uid",property = "uid"),
@Result(column = "money",property = "money"),
@Result(property = "user",column = "uid",one=@One(select="com.itheima.dao.IUserDao.findById",fetchType= FetchType.EAGER))
})
List<Account> findAll();
/**
* 根據(jù)用戶id查詢賬戶信息
* @param userId
* @return
*/
@Select("select * from account where uid = #{userId}")
List<Account> findAccountByUid(Integer userId);
}
mybatis注解開發(fā)一對多的查詢配置
//一對多關(guān)系映射：一個(gè)用戶對應(yīng)多個(gè)賬戶
private List<Account> accounts;
public List<Account> getAccounts() {
return accounts;
}
public void setAccounts(List<Account> accounts) {
this.accounts = accounts;
}
/**
* 查詢所有用戶
* @return
*/
@Select("select * from user")
@Results(id="userMap",value={
@Result(id=true,column = "id",property = "userId"),
@Result(column = "username",property = "userName"),
@Result(column = "address",property = "userAddress"),
@Result(column = "sex",property = "userSex"),
@Result(column = "birthday",property = "userBirthday"),
@Result(property = "accounts",column = "id",
many = @Many(select = "com.itheima.dao.IAccountDao.findAccountByUid",
fetchType = FetchType.LAZY))
})
List<User> findAll();
package com.itheima.dao;
import com.itheima.domain.Account;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.mapping.FetchType;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public interface IAccountDao {
/**
* 查詢所有賬戶唉地，并且獲取每個(gè)賬戶所屬的用戶信息
* @return
*/
@Select("select * from account")
@Results(id="accountMap",value = {
@Result(id=true,column = "id",property = "id"),
@Result(column = "uid",property = "uid"),
@Result(column = "money",property = "money"),
@Result(property = "user",column = "uid",one=@One(select="com.itheima.dao.IUserDao.findById",fetchType= FetchType.EAGER))
})
List<Account> findAll();
/**
* 根據(jù)用戶id查詢賬戶信息
* @param userId
* @return
*/
@Select("select * from account where uid = #{userId}")
List<Account> findAccountByUid(Integer userId);
}
package com.itheima.test;
import com.itheima.dao.IUserDao;
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 java.io.InputStream;
import java.util.List;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public class AnnotationCRUDTest {
private InputStream in;
private SqlSessionFactory factory;
private SqlSession session;
private IUserDao userDao;
@Before
public void init()throws Exception{
in = Resources.getResourceAsStream("SqlMapConfig.xml");
factory = new SqlSessionFactoryBuilder().build(in);
session = factory.openSession();
userDao = session.getMapper(IUserDao.class);
}
@After
public void destroy()throws Exception{
session.commit();
session.close();
in.close();
}
@Test
public void testFindAll(){
List<User> users = userDao.findAll();
// for(User user : users){
// System.out.println("---每個(gè)用戶的信息----");
// System.out.println(user);
// System.out.println(user.getAccounts());
// }
}
@Test
public void testFindOne(){
User user = userDao.findById(57);
System.out.println(user);
}
@Test
public void testFindByName(){
List<User> users = userDao.findUserByName("%mybatis%");
for(User user : users){
System.out.println(user);
}
}
}
mybatis注解開發(fā)使用二級緩存
- SecondLevelCatchTest.java
package com.itheima.test;
import com.itheima.dao.IUserDao;
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 java.io.InputStream;
/**
* @author 黑馬程序員
* @Company http://www.ithiema.com
*/
public class SecondLevelCatchTest {
private InputStream in;
private SqlSessionFactory factory;
@Before
public void init()throws Exception{
in = Resources.getResourceAsStream("SqlMapConfig.xml");
factory = new SqlSessionFactoryBuilder().build(in);
}
@After
public void destroy()throws Exception{
in.close();
}
@Test
public void testFindOne(){
SqlSession session = factory.openSession();
IUserDao userDao = session.getMapper(IUserDao.class);
User user = userDao.findById(57);
System.out.println(user);
session.close();//釋放一級緩存
SqlSession session1 = factory.openSession();//再次打開session
IUserDao userDao1 = session1.getMapper(IUserDao.class);
User user1 = userDao1.findById(57);
System.out.println(user1);
session1.close();
}
}
- IUserDao.java and SqlMapConfig.xml
@CacheNamespace(blocking = true)
public interface IUserDao {
***
}
<!--配置開啟二級緩存-->
<settings>
<setting name="cacheEnabled" value="true"/>
</settings>
