<?xml version="." encoding="UTF-" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper .//EN" "http://mybatis.org/dtd/mybatis--mapper.dtd">
<!-- 為這個(gè)mapper指定一個(gè)唯一的namespace，namespace的值習(xí)慣上設(shè)置成包名+sql映射文件名，這樣就能夠保證namespace的值是唯一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后綴)
-->
<mapper namespace="me.gacl.mapping.userMapper">
<!-- 在select標(biāo)簽中編寫(xiě)查詢(xún)的SQL語(yǔ)句， 設(shè)置select標(biāo)簽的id屬性為getUser，id屬性值必須是唯一的，不能夠重復(fù)
使用parameterType屬性指明查詢(xún)時(shí)使用的參數(shù)類(lèi)型，resultType屬性指明查詢(xún)返回的結(jié)果集類(lèi)型
resultType="me.gacl.domain.User"就表示將查詢(xún)結(jié)果封裝成一個(gè)User類(lèi)的對(duì)象返回
User類(lèi)就是users表所對(duì)應(yīng)的實(shí)體類(lèi)
-->
<!-- 
根據(jù)id查詢(xún)得到一個(gè)user對(duì)象
-->
<select id="getUser" parameterType="int" 
resultType="me.gacl.domain.User">
select * from users where id=#{id}
</select>
<!-- 創(chuàng)建用戶(hù)(Create) -->
<insert id="addUser" parameterType="me.gacl.domain.User">
insert into users(name,age) values(#{name},#{age})
</insert>
<!-- 刪除用戶(hù)(Remove) -->
<delete id="deleteUser" parameterType="int">
delete from users where id=#{id}
</delete>
<!-- 修改用戶(hù)(Update) -->
<update id="updateUser" parameterType="me.gacl.domain.User">
update users set name=#{name},age=#{age} where id=#{id}
</update>
<!-- 查詢(xún)?nèi)坑脩?hù)-->
<select id="getAllUsers" resultType="me.gacl.domain.User">
select * from users
</select>
</mapper> 

package me.gacl.test;
import java.util.List;
import me.gacl.domain.User;
import me.gacl.util.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
public class TestCRUDByXmlMapper {
@Test
public void testAdd(){
//SqlSession sqlSession = MyBatisUtil.getSqlSession(false);
SqlSession sqlSession = MyBatisUtil.getSqlSession(true);
/**
* 映射sql的標(biāo)識(shí)字符串，
* me.gacl.mapping.userMapper是userMapper.xml文件中mapper標(biāo)簽的namespace屬性的值，
* addUser是insert標(biāo)簽的id屬性值，通過(guò)insert標(biāo)簽的id屬性值就可以找到要執(zhí)行的SQL
*/
String statement = "me.gacl.mapping.userMapper.addUser";//映射sql的標(biāo)識(shí)字符串
User user = new User();
user.setName("用戶(hù)孤傲蒼狼");
user.setAge();
//執(zhí)行插入操作
int retResult = sqlSession.insert(statement,user);
//手動(dòng)提交事務(wù)
//sqlSession.commit();
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(retResult);
}
@Test
public void testUpdate(){
SqlSession sqlSession = MyBatisUtil.getSqlSession(true);
/**
* 映射sql的標(biāo)識(shí)字符串，
* me.gacl.mapping.userMapper是userMapper.xml文件中mapper標(biāo)簽的namespace屬性的值，
* updateUser是update標(biāo)簽的id屬性值，通過(guò)update標(biāo)簽的id屬性值就可以找到要執(zhí)行的SQL
*/
String statement = "me.gacl.mapping.userMapper.updateUser";//映射sql的標(biāo)識(shí)字符串
User user = new User();
user.setId();
user.setName("孤傲蒼狼");
user.setAge();
//執(zhí)行修改操作
int retResult = sqlSession.update(statement,user);
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(retResult);
}
@Test
public void testDelete(){
SqlSession sqlSession = MyBatisUtil.getSqlSession(true);
/**
* 映射sql的標(biāo)識(shí)字符串，
* me.gacl.mapping.userMapper是userMapper.xml文件中mapper標(biāo)簽的namespace屬性的值，
* deleteUser是delete標(biāo)簽的id屬性值，通過(guò)delete標(biāo)簽的id屬性值就可以找到要執(zhí)行的SQL
*/
String statement = "me.gacl.mapping.userMapper.deleteUser";//映射sql的標(biāo)識(shí)字符串
//執(zhí)行刪除操作
int retResult = sqlSession.delete(statement,);
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(retResult);
}
@Test
public void testGetAll(){
SqlSession sqlSession = MyBatisUtil.getSqlSession();
/**
* 映射sql的標(biāo)識(shí)字符串，
* me.gacl.mapping.userMapper是userMapper.xml文件中mapper標(biāo)簽的namespace屬性的值，
* getAllUsers是select標(biāo)簽的id屬性值，通過(guò)select標(biāo)簽的id屬性值就可以找到要執(zhí)行的SQL
*/
String statement = "me.gacl.mapping.userMapper.getAllUsers";//映射sql的標(biāo)識(shí)字符串
//執(zhí)行查詢(xún)操作，將查詢(xún)結(jié)果自動(dòng)封裝成List<User>返回
List<User> lstUsers = sqlSession.selectList(statement);
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(lstUsers);
}
} 

package me.gacl.mapping;
import java.util.List;
import me.gacl.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;
/**
* @author gacl
* 定義sql映射的接口，使用注解指明方法要執(zhí)行的SQL
*/
public interface UserMapperI {
//使用@Insert注解指明add方法要執(zhí)行的SQL
@Insert("insert into users(name, age) values(#{name}, #{age})")
public int add(User user);
//使用@Delete注解指明deleteById方法要執(zhí)行的SQL
@Delete("delete from users where id=#{id}")
public int deleteById(int id);
//使用@Update注解指明update方法要執(zhí)行的SQL
@Update("update users set name=#{name},age=#{age} where id=#{id}")
public int update(User user);
//使用@Select注解指明getById方法要執(zhí)行的SQL
@Select("select * from users where id=#{id}")
public User getById(int id);
//使用@Select注解指明getAll方法要執(zhí)行的SQL
@Select("select * from users")
public List<User> getAll();
}

<?xml version="." encoding="UTF-"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config .//EN" "http://mybatis.org/dtd/mybatis--config.dtd">
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<!-- 配置數(shù)據(jù)庫(kù)連接信息 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:/mybatis" />
<property name="username" value="root" />
<property name="password" value="XDP" />
</dataSource>
</environment>
</environments>
<mappers>
<!-- 注冊(cè)u(píng)serMapper.xml文件， 
userMapper.xml位于me.gacl.mapping這個(gè)包下，所以resource寫(xiě)成me/gacl/mapping/userMapper.xml-->
<mapper resource="me/gacl/mapping/userMapper.xml"/>
<!-- 注冊(cè)UserMapper映射接口-->
<mapper class="me.gacl.mapping.UserMapperI"/>
</mappers>
</configuration> 

package me.gacl.test;
import java.util.List;
import me.gacl.domain.User;
import me.gacl.mapping.UserMapperI;
import me.gacl.util.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
public class TestCRUDByAnnotationMapper {
@Test
public void testAdd(){
SqlSession sqlSession = MyBatisUtil.getSqlSession(true);
//得到UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象，UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象由sqlSession.getMapper(UserMapperI.class)動(dòng)態(tài)構(gòu)建出來(lái)
UserMapperI mapper = sqlSession.getMapper(UserMapperI.class);
User user = new User();
user.setName("用戶(hù)xdp");
user.setAge();
int add = mapper.add(user);
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(add);
}
@Test
public void testUpdate(){
SqlSession sqlSession = MyBatisUtil.getSqlSession(true);
//得到UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象，UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象由sqlSession.getMapper(UserMapperI.class)動(dòng)態(tài)構(gòu)建出來(lái)
UserMapperI mapper = sqlSession.getMapper(UserMapperI.class);
User user = new User();
user.setId();
user.setName("孤傲蒼狼_xdp");
user.setAge();
//執(zhí)行修改操作
int retResult = mapper.update(user);
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(retResult);
}
@Test
public void testDelete(){
SqlSession sqlSession = MyBatisUtil.getSqlSession(true);
//得到UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象，UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象由sqlSession.getMapper(UserMapperI.class)動(dòng)態(tài)構(gòu)建出來(lái)
UserMapperI mapper = sqlSession.getMapper(UserMapperI.class);
//執(zhí)行刪除操作
int retResult = mapper.deleteById();
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(retResult);
}
@Test
public void testGetUser(){
SqlSession sqlSession = MyBatisUtil.getSqlSession();
//得到UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象，UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象由sqlSession.getMapper(UserMapperI.class)動(dòng)態(tài)構(gòu)建出來(lái)
UserMapperI mapper = sqlSession.getMapper(UserMapperI.class);
//執(zhí)行查詢(xún)操作，將查詢(xún)結(jié)果自動(dòng)封裝成User返回
User user = mapper.getById();
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(user);
}
@Test
public void testGetAll(){
SqlSession sqlSession = MyBatisUtil.getSqlSession();
//得到UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象，UserMapperI接口的實(shí)現(xiàn)類(lèi)對(duì)象由sqlSession.getMapper(UserMapperI.class)動(dòng)態(tài)構(gòu)建出來(lái)
UserMapperI mapper = sqlSession.getMapper(UserMapperI.class);
//執(zhí)行查詢(xún)操作，將查詢(xún)結(jié)果自動(dòng)封裝成List<User>返回
List<User> lstUsers = mapper.getAll();
//使用SqlSession執(zhí)行完SQL之后需要關(guān)閉SqlSession
sqlSession.close();
System.out.println(lstUsers);
}
} 

package me.gacl.util;
import java.io.InputStream;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MyBatisUtil {
/**
* 獲取SqlSessionFactory
* @return SqlSessionFactory
*/
public static SqlSessionFactory getSqlSessionFactory() {
String resource = "conf.xml";
InputStream is = MyBatisUtil.class.getClassLoader().getResourceAsStream(resource);
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
return factory;
}
/**
* 獲取SqlSession
* @return SqlSession
*/
public static SqlSession getSqlSession() {
return getSqlSessionFactory().openSession();
}
/**
* 獲取SqlSession
* @param isAutoCommit 
* true 表示創(chuàng)建的SqlSession對(duì)象在執(zhí)行完SQL之后會(huì)自動(dòng)提交事務(wù)
* false 表示創(chuàng)建的SqlSession對(duì)象在執(zhí)行完SQL之后不會(huì)自動(dòng)提交事務(wù)，這時(shí)就需要我們手動(dòng)調(diào)用sqlSession.commit()提交事務(wù)
* @return SqlSession
*/
public static SqlSession getSqlSession(boolean isAutoCommit) {
return getSqlSessionFactory().openSession(isAutoCommit);
}
}