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初始mybatis
1.
MyBatis 本是的apache一个开源项目iBatis, 2010年这个项目由apache software foundation 迁移到了google code，
并且改名为MyBatis 。
iBATIS一词来源于“internet”和“abatis”的组合，是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps
和Data Access Objects（DAO）
2.
① 首先你需要的工具是eclipse和安装了mysql服务器的机器
② 需要jar包，包括mybatis-3.2.6.jar和mysql-connector-java-5.1.7-bin.jar
③ 由于进行的简单的测试，因此只需这两jar就够了。
④ 由于是持久化层，所以建一个 java project 即可
3.
1)数据库文件(数据库名为mc，表名为user)
CREATE TABLE user ( `userId` bigint(20) NOT NULL AUTO_INCREMENT , `userName` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , `password` varchar(80) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , `comment` varchar(250) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL , PRIMARY KEY (`userId`), UNIQUE INDEX `UQ_User_userName` (`userName`) USING BTREE )
采用如下的命令查看表的结构
2)创建一个实体类
1 package com.baba.miao.test; 2 3 public class User { 4 private int userId; 5 private String userName; 6 private String password; 7 private String comment; 8 9 public int getUserId() { 10 return userId; 11 } 12 13 public void setUserId(int userId) { 14 this.userId = userId; 15 } 16 17 public String getUserName() { 18 return userName; 19 } 20 21 public void setUserName(String userName) { 22 this.userName = userName; 23 } 24 25 public String getPassword() { 26 return password; 27 } 28 29 public void setPassword(String password) { 30 this.password = password; 31 } 32 33 public String getComment() { 34 return comment; 35 } 36 37 public void setComment(String comment) { 38 this.comment = comment; 39 } 40 41 public User(int userId, String userName, String password, String comment) { 42 super(); 43 this.userId = userId; 44 this.userName = userName; 45 this.password = password; 46 this.comment = comment; 47 } 48 49 public User() { 50 51 } 52 53 public String toString() { 54 return "User [userId=" + userId + ", userName=" + userName 55 + ", password=" + password + ", comment=" + comment + "]"; 56 } 57 58 }
3)创建DAO层
1 package com.baba.miao.test; 2 3 import java.util.List; 4 5 public interface UserDao { 6 7 public int insert(User user); 8 9 public int update(User user); 10 11 public int delete(String userName); 12 13 public List<User> selectAll(); 14 15 public int countAll(); 16 17 public User findByUserName(String userName); 18 }
4）创建实体类的映射文件
<?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.baba.miao.test.UserDao"> <select id="countAll" resultType="int"> select count(*) c from user; </select> <select id="selectAll" resultType="com.baba.miao.test.User"> select * from user order by userName asc </select> <insert id="insert" parameterType="com.baba.miao.test.User"> insert into user(userName,password,comment) values(#{userName},#{password},#{comment}) </insert> <update id="update" parameterType="com.baba.miao.test.User"> update user set userName=#{userName},password=#{password},comment=#{comment} where userName=#{userName} </update> <delete id="delete" parameterType="int"> delete from user where userName=#{userName} </delete> <select id="findByUserName" parameterType="String" resultType="com.baba.miao.test.User"> select * from user where userName=#{userName} </select> </mapper>
5)创建mybatis-config配置文件
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 4 <configuration> 5 <properties resource="jdbc.properties" /> 6 <typeAliases> 7 <package name="com.baba.miao.test"/> 8 </typeAliases> 9 <environments default="development"> 10 <environment id="development"> 11 <transactionManager type="JDBC" /> 12 <dataSource type="POOLED"> 13 <property name="driver" value="${driver}" /> 14 <property name="url" value="${url}" /> 15 <property name="username" value="${username}" /> 16 <property name="password" value="${password}" /> 17 </dataSource> 18 </environment> 19 </environments> 20 <mappers> 21 <mapper resource="com/baba/miao/test/UserDaoMapper.xml" /> 22 </mappers> 23 </configuration>
6) 创建jdbc.properties连接数据库文件
1 username=root 2 password=mmmm 3 url=jdbc:mysql://localhost:3306/mc 4 driver=com.mysql.jdbc.Driver
7）编辑单元测试文件UserDaoTest
1 package com.baba.miao.test; 2 3 import java.io.IOException; 4 import java.io.Reader; 5 import java.util.Iterator; 6 import java.util.List; 7 8 import org.apache.ibatis.io.Resources; 9 import org.apache.ibatis.session.SqlSession; 10 import org.apache.ibatis.session.SqlSessionFactory; 11 import org.apache.ibatis.session.SqlSessionFactoryBuilder; 12 import org.junit.Test; 13 14 public class UserDaoTest { 15 @Test 16 public void userDaoTest() throws IOException { 17 String resource = "mybatis-config.xml"; 18 Reader reader = Resources.getResourceAsReader(resource); 19 SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder(); 20 SqlSessionFactory factory = builder.build(reader); 21 22 SqlSession session = factory.openSession(); 23 UserDao userDao = session.getMapper(UserDao.class); 24 25 User user = new User(); 26 user.setUserId(1); 27 user.setUserName("miaochuang"); 28 user.setPassword("123456"); 29 user.setComment("我爱你"); 30 31 userDao.insert(user); 32 System.out.println("记录条数：" + userDao.countAll()); 33 34 List<User> users = userDao.selectAll(); 35 Iterator<User> iter = users.iterator(); 36 while (iter.hasNext()) { 37 User u = iter.next(); 38 System.out.println("用户名：" + u.getUserName() + "密码：" 39 + u.getPassword()); 40 } 41 session.commit(); 42 session.close(); 43 } 44 }
参考目录结构:
技术总结：
mybatis持久化技术
EL表达式
单元测试
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