MyBatis3 之增删改查操作
55bd
12年前
MyBatis3 之 CRUD：
jar包就不上了，主要看代码。先总览一下文件结构：
然后是代码：
1）configuration.xml ， MyBatis主配置文件
<?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"> <!-- 注意：每个标签必须按顺序写，会提示错误：--> <configuration> <!-- 属性配置 --> <properties resource="jdbc.properties"/> <!-- 设置缓存和延迟加载等等重要的运行时的行为方式 --> <settings> <!-- 设置超时时间，它决定驱动等待一个数据库响应的时间 --> <setting name="defaultStatementTimeout" value="25000"/> </settings> <!-- 别名 --> <typeAliases> <typeAlias alias="User" type="com.mybatis.model.User"/> </typeAliases> <environments default="development"> <!-- environment 元素体中包含对事务管理和连接池的环境配置 --> <environment id="development"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driver" value="${driver}" /> <property name="url" value="${url}" /> <property name="username" value="${username}" /> <property name="password" value="${password}" /> </dataSource> </environment> </environments> <!-- ORM映射文件 --> <mappers> <mapper resource="com/mybatis/model/UserSqlMap.xml" /> </mappers> </configuration> 2)jdbc.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/mybatis username=root password=1234563)log4j.properties
log4j.rootLogger=DEBUG,A1 # \u8f93\u51fa\u5230\u63a7\u5236\u53f0 log4j.appender.A1=org.apache.log4j.ConsoleAppender log4j.appender.A1.layout=org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern=%d{yyyy-MM-dd HH\:mm\:ss} [\u65E5\u5FD7\u4FE1\u606F] %m%n 4）User .java package com.mybatis.model; import java.io.Serializable; @SuppressWarnings("serial") public class User implements Serializable { private int id; private String userName; private String password; public User(){ } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } } 5)UserSqlMap.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd"> <!-- namespace用于java代码调用时识别指定xml的mapper文件 --> <mapper namespace="com.mybatis.model.User"> <!-- 配置ORM映射 --> <resultMap type="User" id="user_orm"> <id property="id" column="id"/> <result property="userName" column="userName"/> <result property="password" column="password"/> </resultMap> <!-- 用来定义可重用的SQL代码段 --> <sql id="demo_sql"> userName,password </sql> <insert id="inser_user" parameterType="User"> <!-- include 引用可重用的SQL代码段 --> INSERT INTO USER(<include refid="demo_sql"/>) VALUES(#{userName},#{password}) </insert> <update id="update_user" parameterType="User"> UPDATE USER SET userName=#{userName} ,password=#{password} WHERE id=#{id} </update> <update id="delete_user" parameterType="int"> DELETE FROM USER WHERE id=#{id} </update> <select id="selectAll_user" useCache="false" flushCache="true" resultMap="user_orm"> SELECT * FROM USER </select> <!-- 使用map传人多个参数 --> <select id="selectList_user" useCache="false" flushCache="true" parameterType="map" resultMap="user_orm"> SELECT * FROM USER LIMIT #{pageNow},#{pageSize} </select> <select id="selectById_user" parameterType="int" resultType="User"> SELECT * FROM USER WHERE id= #{id} </select> <select id="selectCount_user" resultType="int"> SELECT count(*) FROM USER </select> <select id="selectByName_user" parameterType="String" resultType="User"> SELECT * FROM USER WHERE userName= #{userName} </select> </mapper> 6)SessionFactoryUtil.java MyBatis工具类，用于创建SqlSessionFactory package com.mybatis.sessionfactory; import java.io.IOException; import java.io.Reader; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; public class SessionFactoryUtil { private static final String RESOURCE = "Configuration.xml"; private static SqlSessionFactory sqlSessionFactory = null; private static ThreadLocal<SqlSession> threadLocal = new ThreadLocal<SqlSession>(); static { Reader reader = null; try { reader = Resources.getResourceAsReader(RESOURCE); } catch (IOException e) { throw new RuntimeException("Get resource error:"+RESOURCE, e); } sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); } /** * Function : 获得SqlSessionFactory */ public static SqlSessionFactory getSqlSessionFactory(){ return sqlSessionFactory; } /** * Function : 重新创建SqlSessionFactory */ public static void rebuildSqlSessionFactory(){ Reader reader = null; try { reader = Resources.getResourceAsReader(RESOURCE); } catch (IOException e) { throw new RuntimeException("Get resource error:"+RESOURCE, e); } sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); } /** * Function : 获取sqlSession */ public static SqlSession getSession(){ SqlSession session = threadLocal.get(); if(session!=null){ if(sqlSessionFactory == null){ getSqlSessionFactory(); } //如果sqlSessionFactory不为空则获取sqlSession，否则返回null session = (sqlSessionFactory!=null) ? sqlSessionFactory.openSession(): null; } return session; } /** * Function : 关闭sqlSession */ public static void closeSession(){ SqlSession session = threadLocal.get(); threadLocal.set(null); if(session!=null){ session.close(); } } } 7)UserDao interface package com.mybatis.dao; import java.util.List; import com.mybatis.model.User; public interface UserDao { public User load(int id); public void add(User user); public void update(User user); public void delete(int id); public User findByName(String userName); public List<User> queryAllUser(); public List<User> list(int pageNow,int pageSize); public int getAllCount(); } 8)UserDaoImpl package com.mybatis.dao.implment; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.ibatis.session.SqlSession; import com.mybatis.dao.UserDao; import com.mybatis.model.User; import com.mybatis.sessionfactory.SessionFactoryUtil; public class UserDaoImpl implements UserDao { public User load(int id){ SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession(); User user = (User) session.selectOne("com.mybatis.model.User.selectById_user", id); session.close(); return user; } public void add(User user) { SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession(); session.insert("com.mybatis.model.User.inser_user", user); session.commit(); session.close(); } public void update(User user){ SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession(); session.update("com.mybatis.model.User.update_user", user); session.commit(); session.close(); } public void delete(int id){ SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession(); session.delete("com.mybatis.model.User.delete_user", id); session.close(); } public User findByName(String userName){ SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession(); User user = (User)session.selectOne("com.mybatis.model.User.selectByName_user", userName); session.close(); return user; } @SuppressWarnings("unchecked") public List<User> queryAllUser() { SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession(); List<User> list = session.selectList("com.mybatis.model.User.selectAll_user"); session.close(); return list; } @SuppressWarnings("unchecked") public List<User> list(int pageNow , int pageSize){ SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession(); Map<String,Object> params = new HashMap<String ,Object>(); params.put("pageNow", pageNow); params.put("pageSize", pageSize); List<User> list = session.selectList("com.mybatis.model.User.selectList_user", params); session.close(); return list; } public int getAllCount(){ SqlSession session =SessionFactoryUtil.getSqlSessionFactory().openSession(); int count = (Integer) session.selectOne("com.mybatis.model.User.selectCount_user"); session.close(); return count; } } 9)测试类： package com.mybatis.dao.implment; import java.util.List; import org.junit.Test; import com.mybatis.dao.UserDao; import com.mybatis.model.User; public class UserDaoTest { private UserDao userDao = new UserDaoImpl(); @Test public void testLoad(){ User u = userDao.load(1); if(u!=null){ System.out.println("UserId:"+u.getId()+" UserName:"+u.getUserName()+" Password:"+u.getPassword()); } else{ System.out.println("id不存在！！"); } } @Test public void testAdd(){ User user = new User(); user.setUserName("admin5"); user.setPassword("123456"); userDao.add(user); } @Test public void testUpdate(){ User user = new User(); user.setId(2); user.setUserName("manager"); user.setPassword("123456"); userDao.update(user); } @Test public void testQueryAllUser(){ List<User> list = userDao.queryAllUser(); if(list!=null&list.size()>0){ for(User u:list){ System.out.println("UserId:"+u.getId()+" UserName:"+u.getUserName()+" Password:"+u.getPassword()); } } } @Test public void testFindByName(){ User u = userDao.findByName("admin"); if(u!=null){ System.out.println("UserId:"+u.getId()+" UserName:"+u.getUserName()+" Password:"+u.getPassword()); } else{ System.out.println("用户名不存在！！"); } } @Test public void testList(){ List<User> list = userDao.list(1, 4); if(list!=null&list.size()>0){ for(User u:list){ System.out.println("UserId:"+u.getId()+" UserName:"+u.getUserName()+" Password:"+u.getPassword()); } } } @Test public void testGetAllCount(){ System.out.println("All Count : "+userDao.getAllCount()); } @Test public void testDelete(){ userDao.delete(3); } } 10)执行testFindByName()： 