【练习】mybatis

 

1、

1 jdbc.driver_class=com.mysql.jdbc.Driver
2 jdbc.url=jdbc:mysql://127.0.0.1:3306/smbms?zeroDateTimeBehavior=convertToNull
3 jdbc.username=root
4 jdbc.password=123456
resources/database.properties/

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>
resources/mybatis-config.xml

3、pojo实体类

4、dao

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper
 3         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 
 6 <mapper namespace="cn.kgc.dao.UserMapper">
 7 
 8     <!-- 查询用户表记录数 -->
 9     <select id="count" resultType="int">
10         select count(1) as count from smbms_user
11     </select>
12 
13     <!-- 查询用户列表 1  -->
14     <select id="userlist" resultType="User">
15         select * from smbms_user
16     </select>
17     <!-- 查询用户列表 2  -->
18     <select id="getUserListByNullParam" resultType="cn.kgc.pojo.User">
19         select * from smbms_user
20     </select>
21 
22     <!--    查询供应商记录数-->
23     <select id="result" resultType="int">
24         select count(1) as count from smbms_provider
25     </select>
26     <!-- 查询供应商列表 1接口  -->
27     <select id="getProviderList" resultType="cn.kgc.pojo.Provider">
28         select * from smbms_provider
29     </select>
30     <!-- 查询供应商列表 2工具  -->
31     <select id="providerlist" resultType="cn.kgc.pojo.Provider">
32         select * from smbms_provider
33     </select>
34 
35 </mapper>
cn/kgc/dao/UserMapper.xml

.

1 public interface UserMapper {
2     public List<User> getUserListByNullParam();
3     public List<Provider> getProviderList();
4 }
cn.kgc.dao.UserMapper

5.util

 1 public class MybatisUtils {
 2     private static SqlSessionFactory sqlSessionFactory;
 3     static {
 4         String path="mybatis-config.xml";
 5         try {
 6             InputStream is= Resources.getResourceAsStream(path);
 7             sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
 8         } catch (IOException e) {
 9             e.printStackTrace();
10         }
11 
12     }
13 
14     public static SqlSession getSqlSession() {
15         return sqlSessionFactory.openSession();
16     }
17 }
cn.kgc.util.MybatisUtils

6.test

  1 package cn.kgc.test;
  2 
  3 import cn.kgc.dao.UserMapper;
  4 import cn.kgc.pojo.Provider;
  5 import cn.kgc.pojo.User;
  6 import cn.kgc.util.MybatisUtils;
  7 import org.apache.ibatis.io.Resources;
  8 import org.apache.ibatis.session.SqlSession;
  9 import org.apache.ibatis.session.SqlSessionFactory;
 10 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 11 import org.junit.Test;
 12 import org.apache.log4j.Logger;
 13 
 14 import java.io.IOException;
 15 import java.io.InputStream;
 16 import java.util.List;
 17 
 18 /**
 19  * Created with IntelliJ IDEA.
 20  * User: L
 21  * Date: 2019/10/21
 22  * Time: 9:52
 23  * Description: No Description
 24  */
 25 public class TestUserMapper {
 26 
 27     /**
 28      * 查询用户条数
 29      */
 30     @Test
 31     public void test01(){
 32         //加载核心配置文件
 33         String path="mybatis-config.xml";
 34         InputStream is=null;
 35         try {
 36             is= Resources.getResourceAsStream(path);
 37             //mybatis中的核心类
 38             SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
 39           SqlSession sqlSession=sqlSessionFactory.openSession();
 40             int count = sqlSession.selectOne("cn.kgc.dao.UserMapper.count");
 41             System.out.println("一共"+count+"条用户记录。");
 42         } catch (IOException e) {
 43             e.printStackTrace();
 44         }
 45 
 46     }
 47 
 48     /**
 49      * 测试输出用户列表
 50      * 工具类
 51      */
 52     @Test
 53     public void test02(){
 54         SqlSession sqlSession= MybatisUtils.getSqlSession();
 55         List<User> userList=sqlSession.selectList("cn.kgc.dao.UserMapper.userlist");
 56         for (User user:userList){
 57             System.out.println("**用户名**"+user.getUserName()+"--"+user.getPhone()+"--"+user.getAddress());
 58         }
 59     }
 60 
 61     /**
 62      * 输出用户列表
 63      * 接口方式
 64      */
 65     @Test
 66     public void test03(){
 67         SqlSession sqlSession = MybatisUtils.getSqlSession();
 68         List<User> userList = sqlSession.getMapper(UserMapper.class).getUserListByNullParam();
 69         for (User user : userList) {
 70             System.out.println("**用户名**"+user.getUserName()+"--"+user.getPhone()+"--"+user.getAddress());
 71         }
 72 
 73     }
 74 
 75     /**
 76      * 查询供应商数
 77      */
 78     @Test
 79     public void test04(){
 80         String path="mybatis-config.xml";
 81         InputStream is=null;
 82         try {
 83             is= Resources.getResourceAsStream(path);
 84             SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
 85             SqlSession sqlSession=sqlSessionFactory.openSession();
 86             int result = sqlSession.selectOne("cn.kgc.dao.UserMapper.result");
 87             System.out.println("一共"+result+"条供应商记录。");
 88         } catch (IOException e) {
 89             e.printStackTrace();
 90         }
 91     }
 92 
 93     /**
 94      * 输出供应商详情
 95      * 接口
 96      */
 97     @Test
 98     public void test05(){
 99         SqlSession sqlSession = MybatisUtils.getSqlSession();
100         List<Provider> providerList = sqlSession.getMapper(UserMapper.class).getProviderList();
101         for (Provider provider : providerList) {
102             System.out.println("**供应商**"+provider.getProName()+"--"+provider.getProContact()+"--"+provider.getProPhone()+"--"+provider.getProDesc());
103         }
104     }
105 
106     /**
107      * 输出供应商详情
108      * 工具
109      */
110     @Test
111     public void test06(){
112         SqlSession sqlSession= MybatisUtils.getSqlSession();
113         List<Provider> providerList=sqlSession.selectList("cn.kgc.dao.UserMapper.providerlist");
114         for (Provider provider:providerList){
115             System.out.println("**供应商**"+provider.getProName()+"--"+provider.getProContact()+"--"+provider.getProPhone()+"--"+provider.getProDesc());
116         }
117     }
118 
119 
120 }
cn.kgc.test.TestUserMapper

 

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原文地址：https://www.cnblogs.com/yanglanlan/p/11714888.html