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>

 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;
    }
}

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();
}

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>

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>

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());
        }
    }
}

运行效果图：