package com.edu.hpu.domain; /** * @author Administrator *user表所對應的實體類 */ public class User { //實體類的屬性和表的字段名稱一一對應 private int id; private String name; private int age; //對屬性進行封裝 public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } //添加toString方法 @Override public String toString() { return "User [id=" + id + ",name=" + name + ",age=" + age + "]"; } } 

package com.edu.hpu.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";//調取配置文件 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 表示創建的SqlSession對象在執行完SQL之后會自動提交事務 * false 表示創建的SqlSession對象在執行完SQL之后不會自動提交事務，這時就需要我們手動調用sqlSession.commit()提交事務 * @return SqlSession */ public static SqlSession getSqlSession(boolean isAutoCommit) { return getSqlSessionFactory().openSession(isAutoCommit); } } 

<?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> <environments default="development"> <environment id="development"> <transactionManager type="JDBC" /> <!-- 配置數據庫連接信息 --> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull" /> <property name="username" value="root" /> <property name="password" value="admin" /> </dataSource> </environment> </environments> <mappers> <!-- 注冊userMapper.xml文件， userMapper.xml位于com.edu.hpu.mapping這個包下，所以resource寫成com/edu/hpu/mapping/userMapper.xml--> <mapper resource="com/edu/hpu/mapping/userMapper.xml"/> <!-- <mapper class="com.edu.hpu.mapping.UserMapper_11"/> --> </mappers> </configuration> 

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.edu.hpu.mapping.userMapper"> <!-- 在select標簽中編寫查詢的SQL語句， 設置select標簽的id屬性為getUser，id屬性值必須是唯一的，不能夠重復 使用parameterType屬性指明查詢時使用的參數類型，resultType屬性指明查詢返回的結果集類型 resultType="com.edu.hpu.domain.User"就表示將查詢結果封裝成一個User類的對象返回 User類就是users表所對應的實體類 --> <!-- 根據id查詢得到一個user對象 --> <select id="getUser" parameterType="int" resultType="com.edu.hpu.domain.User"> select * from users where id=#{id} </select> <!-- 創建用戶(Create) --> <insert id="addUser" parameterType="com.edu.hpu.domain.User"> insert into users(name,age) values(#{name},#{age}) </insert> <!-- 刪除用戶(Remove) --> <delete id="deleteUser" parameterType="int"> delete from users where id=#{id} </delete> <!-- 修改用戶(Update) --> <update id="updateUser" parameterType="com.edu.hpu.domain.User"> update users set name=#{name},age=#{age} where id=#{id} </update> <!-- 查詢全部用戶--> <select id="getAllUsers" resultType="com.edu.hpu.domain.User"> select * from users </select> </mapper> 

package com.edu.hpu.test; import java.util.List; import com.edu.hpu.domain.User; import com.edu.hpu.util.MyBatisUtil; import org.junit.Test; import org.apache.ibatis.session.SqlSession; public class Test2 { @Test public void testAdd(){ //SqlSession sqlSession = MyBatisUtil.getSqlSession(false); SqlSession sqlSession = MyBatisUtil.getSqlSession(true); /** * 映射sql的標識字符串， * com.edu.hpu.mapping.userMapper是userMapper.xml文件中mapper標簽的namespace屬性的值， * addUser是insert標簽的id屬性值，通過insert標簽的id屬性值就可以找到要執行的SQL */ String statement = "com.edu.hpu.mapping.userMapper.addUser";//映射sql的標識字符串 User user = new User(); user.setName("新增用戶小黃"); user.setAge(20); //執行插入操作 int retResult = sqlSession.insert(statement,user); //手動提交事務 //sqlSession.commit(); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(retResult); } @Test public void testUpdate(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(true); /** * 映射sql的標識字符串， * com.edu.hpu.mapping.userMapper是userMapper.xml文件中mapper標簽的namespace屬性的值， * updateUser是update標簽的id屬性值，通過update標簽的id屬性值就可以找到要執行的SQL */ String statement = "com.edu.hpu.mapping.userMapper.updateUser";//映射sql的標識字符串 User user = new User(); user.setId(3); user.setName("hello world"); user.setAge(25); //執行修改操作 int retResult = sqlSession.update(statement,user); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(retResult); } @Test public void testDelete(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(true); /** * 映射sql的標識字符串， * com.edu.hpu.mapping.userMapper是userMapper.xml文件中mapper標簽的namespace屬性的值， * deleteUser是delete標簽的id屬性值，通過delete標簽的id屬性值就可以找到要執行的SQL */ String statement = "com.edu.hpu.mapping.userMapper.deleteUser";//映射sql的標識字符串 //執行刪除操作 int retResult = sqlSession.delete(statement,4); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(retResult); } @Test public void testGetAll(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(); /** * 映射sql的標識字符串， * com.edu.hpu.mapping.userMapper是userMapper.xml文件中mapper標簽的namespace屬性的值， * getAllUsers是select標簽的id屬性值，通過select標簽的id屬性值就可以找到要執行的SQL */ String statement = "com.edu.hpu.mapping.userMapper.getAllUsers";//映射sql的標識字符串 //執行查詢操作，將查詢結果自動封裝成List<User>返回 List<User> lstUsers = sqlSession.selectList(statement); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(lstUsers); } } 

package com.edu.hpu.mapping; import java.util.List; import com.edu.hpu.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行的SQL */ public interface UserMapper_11 { //使用@Insert注解指明add方法要執行的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方法要執行的SQL @Select("select * from users") public List<User> getAll(); } 

<mapper class="com.edu.hpu.mapping.UserMapper_11"/>

package com.edu.hpu.test; import java.util.List; import com.edu.hpu.domain.User; import com.edu.hpu.mapping.UserMapper_11; import com.edu.hpu.util.MyBatisUtil; import org.apache.ibatis.session.SqlSession; import org.junit.Test; /** * @author Administrator *對注解進行測試 */ public class Test3 { @Test public void testAdd(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(true); //得到UserMapper接口的實現類對象，UserMapper接口的實現類對象由sqlSession.getMapper(UserMapper.class)動態構建出來 UserMapper_11 mapper = sqlSession.getMapper(UserMapper_11.class); User user = new User(); user.setName("大智若愚"); user.setAge(20); int add = mapper.add(user); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(add); } @Test public void testUpdate(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(true); //得到UserMapper接口的實現類對象，UserMapper接口的實現類對象由sqlSession.getMapper(UserMapper.class)動態構建出來 UserMapper_11 mapper = sqlSession.getMapper(UserMapper_11.class); User user = new User(); user.setId(3); user.setName("大音希聲"); user.setAge(26); //執行修改操作 int retResult = mapper.update(user); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(retResult); } @Test public void testDelete(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(true); //得到UserMapper接口的實現類對象，UserMapper接口的實現類對象由sqlSession.getMapper(UserMapper.class)動態構建出來 UserMapper_11 mapper = sqlSession.getMapper(UserMapper_11.class); //執行刪除操作 int retResult = mapper.deleteById(7); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(retResult); } @Test public void testGetUser(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(); //得到UserMapper接口的實現類對象，UserMapperI接口的實現類對象由sqlSession.getMapper(UserMapper.class)動態構建出來 UserMapper_11 mapper = sqlSession.getMapper(UserMapper_11.class); //執行查詢操作，將查詢結果自動封裝成User返回 User user = mapper.getById(1); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(user); } @Test public void testGetAll(){ SqlSession sqlSession = MyBatisUtil.getSqlSession(); //得到UserMapper接口的實現類對象，UserMapper接口的實現類對象由sqlSession.getMapper(UserMapper.class)動態構建出來 UserMapper_11 mapper = sqlSession.getMapper(UserMapper_11.class); //執行查詢操作，將查詢結果自動封裝成List<User>返回 List<User> lstUsers = mapper.getAll(); //使用SqlSession執行完SQL之后需要關閉SqlSession sqlSession.close(); System.out.println(lstUsers); } }