【练习】mybatis

 

1、

jdbc.driver_class=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/smbms?zeroDateTimeBehavior=convertToNull
jdbc.username=root
jdbc.password=123456

2、

<?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>
    <!--加载-->
    <properties resource="database.properties">

        <property name="driver" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/smbms?zeroDateTimeBehavior=convertToNull" />
        <property name="username" value="root" />
        <property name="password" value="123456" />

    </properties>
    <!--设置日志行为-->
<!--    <settings>-->
<!--        <setting name="logImpl" value="LOG4J"/>-->
<!--    </settings>-->
    <typeAliases>
<!--        //不推荐使用，当我们有很多的实体类的时候，这里配置的也很冗余-->
<!--        <typeAlias type="cn.kgc.pojo.User"></typeAlias>-->
        <package name="cn.kgc.pojo"></package>
    </typeAliases>

    <!--更改运行环境-->
    <environments default="test">
       <!-- 配置运行环境-->
        <environment id="development">
            <transactionManager type="JDBC" />
            <!-- 配置数据库连接信息 -->
            <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>
        <environment id="test">
            <transactionManager type="JDBC" />
            <!-- 配置数据库连接信息 -->
            <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>
    <mappers>
        <mapper resource="cn/kgc/dao/UserMapper.xml"/>
    </mappers>

</configuration>

3、pojo实体类

4、dao

<?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="cn.kgc.dao.UserMapper">

    <!-- 查询用户表记录数 -->
    <select id="count" resultType="int">
        select count(1) as count from smbms_user
    </select>

    <!-- 查询用户列表 1  -->
    <select id="userlist" resultType="User">
        select * from smbms_user
    </select>
    <!-- 查询用户列表 2  -->
    <select id="getUserListByNullParam" resultType="cn.kgc.pojo.User">
        select * from smbms_user
    </select>

    <!--    查询供应商记录数-->
    <select id="result" resultType="int">
        select count(1) as count from smbms_provider
    </select>
    <!-- 查询供应商列表 1接口  -->
    <select id="getProviderList" resultType="cn.kgc.pojo.Provider">
        select * from smbms_provider
    </select>
    <!-- 查询供应商列表 2工具  -->
    <select id="providerlist" resultType="cn.kgc.pojo.Provider">
        select * from smbms_provider
    </select>

</mapper>

.

public interface UserMapper {
    public List<User> getUserListByNullParam();
    public List<Provider> getProviderList();
}

5.util

public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    static {
        String path="mybatis-config.xml";
        try {
            InputStream is= Resources.getResourceAsStream(path);
            sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static SqlSession getSqlSession() {
        return sqlSessionFactory.openSession();
    }
}

6.test

package cn.kgc.test;

import cn.kgc.dao.UserMapper;
import cn.kgc.pojo.Provider;
import cn.kgc.pojo.User;
import cn.kgc.util.MybatisUtils;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import org.apache.log4j.Logger;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * User: L
 * Date: 2019/10/21
 * Time: 9:52
 * Description: No Description
 */
public class TestUserMapper {

    /**
     * 查询用户条数
     */
    @Test
    public void test01(){
        //加载核心配置文件
        String path="mybatis-config.xml";
        InputStream is=null;
        try {
            is= Resources.getResourceAsStream(path);
            //mybatis中的核心类
            SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
          SqlSession sqlSession=sqlSessionFactory.openSession();
            int count = sqlSession.selectOne("cn.kgc.dao.UserMapper.count");
            System.out.println("一共"+count+"条用户记录。");
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    /**
     * 测试输出用户列表
     * 工具类
     */
    @Test
    public void test02(){
        SqlSession sqlSession= MybatisUtils.getSqlSession();
        List<User> userList=sqlSession.selectList("cn.kgc.dao.UserMapper.userlist");
        for (User user:userList){
            System.out.println("**用户名**"+user.getUserName()+"--"+user.getPhone()+"--"+user.getAddress());
        }
    }

    /**
     * 输出用户列表
     * 接口方式
     */
    @Test
    public void test03(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        List<User> userList = sqlSession.getMapper(UserMapper.class).getUserListByNullParam();
        for (User user : userList) {
            System.out.println("**用户名**"+user.getUserName()+"--"+user.getPhone()+"--"+user.getAddress());
        }

    }

    /**
     * 查询供应商数
     */
    @Test
    public void test04(){
        String path="mybatis-config.xml";
        InputStream is=null;
        try {
            is= Resources.getResourceAsStream(path);
            SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
            SqlSession sqlSession=sqlSessionFactory.openSession();
            int result = sqlSession.selectOne("cn.kgc.dao.UserMapper.result");
            System.out.println("一共"+result+"条供应商记录。");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 输出供应商详情
     * 接口
     */
    @Test
    public void test05(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        List<Provider> providerList = sqlSession.getMapper(UserMapper.class).getProviderList();
        for (Provider provider : providerList) {
            System.out.println("**供应商**"+provider.getProName()+"--"+provider.getProContact()+"--"+provider.getProPhone()+"--"+provider.getProDesc());
        }
    }

    /**
     * 输出供应商详情
     * 工具
     */
    @Test
    public void test06(){
        SqlSession sqlSession= MybatisUtils.getSqlSession();
        List<Provider> providerList=sqlSession.selectList("cn.kgc.dao.UserMapper.providerlist");
        for (Provider provider:providerList){
            System.out.println("**供应商**"+provider.getProName()+"--"+provider.getProContact()+"--"+provider.getProPhone()+"--"+provider.getProDesc());
        }
    }


}