mybatis环境搭建和开发步骤

环境搭建

第一步：导入jar包

第二步：导入核心配置文件（mybatis-config.xml）

 <?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>
     <settings>
         <!-- 表示使用log4j来处理日志 -->
         <setting name="logImpl" value="LOG4J"/>
     </settings>

     <!-- 环境变量 连接数据库的信息 -->
     <environments default="dev">
         <environment id="dev">
             <transactionManager type="JDBC"></transactionManager>
             <dataSource type="POOLED">
                 <property name="url" value="jdbc:mysql://127.0.0.1:3306/smbms?zeroDateTimeBehavior=convertToNull"/>
                 <property name="driver" value="com.mysql.jdbc.Driver"/>
                 <property name="username" value="root"/>
                 <property name="password" value="199808025"/>
             </dataSource>
         </environment>
     </environments>

     <!-- 注册Mapper（映射）文件 -->
     <mappers>
         <mapper resource="com/smbms/dao/UserMapper.xml"/>
         <mapper resource="com/smbms/dao/ProviderMapper.xml"/>
         <mapper resource="com/smbms/dao/AddressMapper.xml"/>
         <mapper resource="com/smbms/dao/BillMapper.xml"/>
         <mapper resource="com/smbms/dao/RoleMapper.xml"/>
     </mappers>

 </configuration>

mybatis-config.xml

 开发步骤

第一步：表

第二步：pojo（实体类）

 package com.smbms.entity;

 import java.util.Date;

 public class User {
     private int id;
     private String userCode;
     private String userName;
     private String userPassword;
     private int gender;
     private Date birthday;
     private String phone;
     private String address;
     private int userRole;
     private int createdBy;
     private Date creationDate;
     private int modifyBy;
     private Date modifyDate;
     public User() {

     }

     public User(int id, String userCode, String userName, String userPassword, int gender, Date birthday, String phone,
             String address, int userRole, int createdBy, Date creationDate, int modifyBy, Date modifyDate) {
         super();
         this.id = id;
         this.userCode = userCode;
         this.userName = userName;
         this.userPassword = userPassword;
         this.gender = gender;
         this.birthday = birthday;
         this.phone = phone;
         this.address = address;
         this.userRole = userRole;
         this.createdBy = createdBy;
         this.creationDate = creationDate;
         this.modifyBy = modifyBy;
         this.modifyDate = modifyDate;
     }

     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getUserCode() {
         return userCode;
     }
     public void setUserCode(String userCode) {
         this.userCode = userCode;
     }
     public String getUserName() {
         return userName;
     }
     public void setUserName(String userName) {
         this.userName = userName;
     }
     public String getUserPassword() {
         return userPassword;
     }
     public void setUserPassword(String userPassword) {
         this.userPassword = userPassword;
     }
     public int getGender() {
         return gender;
     }
     public void setGender(int gender) {
         this.gender = gender;
     }
     public Date getBirthday() {
         return birthday;
     }
     public void setBirthday(Date birthday) {
         this.birthday = birthday;
     }
     public String getPhone() {
         return phone;
     }
     public void setPhone(String phone) {
         this.phone = phone;
     }
     public String getAddress() {
         return address;
     }
     public void setAddress(String address) {
         this.address = address;
     }
     public int getUserRole() {
         return userRole;
     }
     public void setUserRole(int userRole) {
         this.userRole = userRole;
     }
     public int getCreatedBy() {
         return createdBy;
     }
     public void setCreatedBy(int createdBy) {
         this.createdBy = createdBy;
     }
     public int getModifyBy() {
         return modifyBy;
     }
     public void setModifyBy(int modifyBy) {
         this.modifyBy = modifyBy;
     }

     public Date getCreationDate() {
         return creationDate;
     }

     public void setCreationDate(Date creationDate) {
         this.creationDate = creationDate;
     }

     public Date getModifyDate() {
         return modifyDate;
     }

     public void setModifyDate(Date modifyDate) {
         this.modifyDate = modifyDate;
     }
 }

实体类

第三步：接口

 package com.smbms.dao;

 import java.util.List;

 import com.smbms.entity.User;

 public interface UserMapper {
     //查询总共有多少记录
     public int count();
     //查询所有
     public List<User> findAll();
 }

接口

第四步：映射文件xxxMapper.xml（dao层）

 <?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.smbms.dao.UserMapper">
     <!-- 记录总条数 -->
     <select id="count" resultType="int">
         select count(1) from smbms_user;
     </select>
     <!-- 查询所有 -->
     <select id="findAll" resultType="com.smbms.entity.User">
         select * from smbms_user;
     </select>
 </mapper>

UserMapper.xml

第五步：注册映射文件

 <?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">

     <!-- 注册Mapper（映射）文件 -->
     <mappers>
         <mapper resource="com/smbms/dao/UserMapper.xml"/>
         <mapper resource="com/smbms/dao/ProviderMapper.xml"/>
         <mapper resource="com/smbms/dao/AddressMapper.xml"/>
         <mapper resource="com/smbms/dao/BillMapper.xml"/>
         <mapper resource="com/smbms/dao/RoleMapper.xml"/>
     </mappers>

 </configuration>

映射文件

第六步：测试

 package com.smbms.dao;

 import java.util.List;

 import org.apache.ibatis.session.SqlSession;
 import org.apache.log4j.Logger;
 import org.junit.Test;

 import com.smbms.entity.User;
 import com.smbms.util.MybatisUtil;

 public class TestUserMapper {

     private Logger log=Logger.getLogger(TestUserMapper.class);

     @Test
     public void count(){
         //SQL--->connection--->SqlSession
         //--->SqlSSessionfactory

 //        InputStream is;
 //        SqlSession sqlSession=null;
 //        try {
 //            is=Resources.getResourceAsStream("mybatis-config.xml");
 //            //获取sqlsession工厂
 //            SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(is);
 //            //获取SQLSession==connection
 //            sqlSession=ssf.openSession();
 //
 //            //执行的sql
 //            int count=sqlSession.selectOne("com.smbms.dao.UserMapper.count");
 //            log.debug(count);
 //        } catch (IOException e) {
 //            e.printStackTrace();
 //        }finally {
 //            if(sqlSession!=null){
 //                sqlSession.close();
 //            }
 //        }
         //执行SQLSession
         SqlSession sqlSession=MybatisUtil.getSqlSession();
         //执行的sql
 //        int count=sqlSession.selectOne("com.smbms.dao.UserMapper.count");
         UserMapper userMapper=sqlSession.getMapper(UserMapper.class);
         int count=userMapper.count();
         log.debug(count);
         //关闭连接
         MybatisUtil.close(sqlSession);
     }

     @Test
     public void findAll(){
         SqlSession sqlSession=MybatisUtil.getSqlSession();
         UserMapper um=sqlSession.getMapper(UserMapper.class);
         List<User> users=um.findAll();
         for(User user:users){
             log.debug(user.getUserName());
         }
     }
 }

测试

运行效果图：