From 774fd65a7a67721b3667268d58aa6d8e9f2383bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E6=99=BA=E7=BF=94?= <2045602860@qq.com>
Date: Tue, 19 Dec 2023 16:09:42 +0000
Subject: [PATCH 1/4] =?UTF-8?q?=E6=96=B0=E5=BB=BA=2034=20=E5=88=98?=
 =?UTF-8?q?=E6=99=BA=E7=BF=94?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 "34 \345\210\230\346\231\272\347\277\224/.keep" | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 "34 \345\210\230\346\231\272\347\277\224/.keep"

diff --git "a/34 \345\210\230\346\231\272\347\277\224/.keep" "b/34 \345\210\230\346\231\272\347\277\224/.keep"
new file mode 100644
index 0000000..e69de29
-- 
Gitee


From bc81da58cdea54f37bbe8871f33a7795514650cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E6=99=BA=E7=BF=94?= <2045602860@qq.com>
Date: Tue, 19 Dec 2023 16:10:01 +0000
Subject: [PATCH 2/4] =?UTF-8?q?34=20=E5=88=98=E6=99=BA=E7=BF=94?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 刘智翔 <2045602860@qq.com>
---
 ...64\345\220\210\347\254\224\350\256\260.md" | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 "34 \345\210\230\346\231\272\347\277\224/SSM\346\241\206\346\236\266\346\225\264\345\220\210\347\254\224\350\256\260.md"

diff --git "a/34 \345\210\230\346\231\272\347\277\224/SSM\346\241\206\346\236\266\346\225\264\345\220\210\347\254\224\350\256\260.md" "b/34 \345\210\230\346\231\272\347\277\224/SSM\346\241\206\346\236\266\346\225\264\345\220\210\347\254\224\350\256\260.md"
new file mode 100644
index 0000000..f15f98e
--- /dev/null
+++ "b/34 \345\210\230\346\231\272\347\277\224/SSM\346\241\206\346\236\266\346\225\264\345\220\210\347\254\224\350\256\260.md"	
@@ -0,0 +1,53 @@
+# SSM框架整合课堂笔记
+
+Maven：专门用于管理和构建Java项目的工具
+
+1.提供了一套标准化的项目结构
+
+2.提供了一套标准化的构建流程（编译、测试、打包、发布...）
+
+3.提供了一套依赖管理机制
+
+
+
+ApacheMaven是一个项目管理和构建工具，它基于项目对象
+
+
+
+Maven模型：
+
+项目对象模型
+
+依赖管理模型
+
+插件
+
+
+
+仓库：
+
+1.本地仓库：自己计算机上的一个目录
+
+2.由Maven团队维护的全球唯一的仓库
+
+3.远程仓库（私服）：一般由公司团队搭建的私有仓库
+
+
+
+坐标分的组成三部分：
+
+groupld：哪个组织开发的，组织名称
+
+artifactID  工作ID：开发的什么项目，项目名称
+
+version：哪个版本，版本号
+
+
+
+专门用来查询maven坐标的网址：
+
+https://mvnrepository.com/
+
+
+
+快捷引入坐标的方式：在pom.xml中按alt+insert，选择Dependency
\ No newline at end of file
-- 
Gitee


From f750b650798a7cd7854c0ae38594c037982b7086 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E6=99=BA=E7=BF=94?= <2045602860@qq.com>
Date: Thu, 21 Dec 2023 14:57:06 +0000
Subject: [PATCH 3/4] =?UTF-8?q?34=20=E5=88=98=E6=99=BA=E7=BF=94?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 刘智翔 <2045602860@qq.com>
---
 .../mybatis.MD"                               | 304 ++++++++++++++++++
 1 file changed, 304 insertions(+)
 create mode 100644 "34 \345\210\230\346\231\272\347\277\224/mybatis.MD"

diff --git "a/34 \345\210\230\346\231\272\347\277\224/mybatis.MD" "b/34 \345\210\230\346\231\272\347\277\224/mybatis.MD"
new file mode 100644
index 0000000..d6cdf5e
--- /dev/null
+++ "b/34 \345\210\230\346\231\272\347\277\224/mybatis.MD"	
@@ -0,0 +1,304 @@
+~~~java
+ mybatis的配置文件的MySQL密码要改
+
+App.java测试类
+
+```java
+
+
+import com.mdd.pojo.User;
+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 java.beans.Transient;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+public class App {
+    @Test
+public  void  selectAll() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag=true;
+        try {
+            List<User> userAll = sqlSession.selectList("test.selectAll");
+            System.out.println(userAll);
+
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("查询成功");
+            }
+        }
+
+    }
+    @Test
+    public  void selectId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+
+
+        boolean flag=true;
+        try {
+
+            User  one = sqlSession.selectOne("test.selectId",1);
+            System.out.println(one);
+
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("查询成功");
+            }
+        }
+    }
+
+
+    @Test
+    public  void deleteId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+
+
+
+
+
+        boolean flag=true;
+        try {
+
+            sqlSession.delete("test.deleteId", 1);
+
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("删除成功");
+            }
+        }
+    }
+    @Test
+    public  void insert() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag=true;
+        try {
+
+            User user = new User();
+            user.setUsername("x狗狗");
+            user.setGender("女");
+            user.setAddr("狗窝");
+            user.setPassword("123456");
+
+            sqlSession.insert("test.insert",user);
+            sqlSession.commit();
+            sqlSession.close();
+
+
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            flag=false;
+        }  finally {
+            sqlSession.commit();
+            sqlSession.close();
+            if (flag){
+                System.out.println("新建成功");
+            }
+        }
+    }
+    @Test
+    public  void update() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+        boolean flag=true;
+        try {
+
+            User user = new User();
+            user.setId(4);
+            user.setUsername("xmu狗狗");
+            user.setGender("女");
+            user.setAddr("狗窝");
+            user.setPassword("123456");
+            sqlSession.update("test.update",user);
+
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            flag=false;
+        }  finally {
+            sqlSession.commit();
+            sqlSession.close();
+            if (flag){
+                System.out.println("修改成功");
+            }
+        }
+
+    }
+}
+
+```
+
+mybatis-config.xml
+
+```java
+<?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>
+    <environments default="development">
+        <environment id="development">
+            <transactionManager type="JDBC"/>
+            <dataSource type="POOLED">
+                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
+                <property name="url" value="jdbc:mysql:///mybatis?useSSL=false"/>
+                <property name="username" value="root"/>
+                <property name="password" value="root"/>
+            </dataSource>
+        </environment>
+    </environments>
+    <mappers>
+        <mapper resource="UserMapper.xml"/>
+    </mappers>
+</configuration>
+```
+
+UserMapper.xml
+
+```java
+<?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="test">
+    <select id="selectAll" resultType="com.mdd.pojo.User">
+        select * from tb_user
+    </select>
+    <select id="selectId" resultType="com.mdd.pojo.User">
+        select * from tb_user where id=#{id}
+    </select>
+    <delete id="deleteId">
+        delete from tb_user where id=#{id}
+    </delete>
+    <insert id="insert">
+        insert into tb_user(username,password,gender,addr) values (#{username},#{password},#{gender},#{addr})
+    </insert>
+    <update id="update">
+        update tb_user SET username = #{username}, password = #{password},gender=#{gender},addr=#{addr} where id=#{id} ;
+    </update>
+</mapper>
+
+
+```
+
+User
+
+```java
+package com.mdd.pojo;
+
+public class User {
+    private int id;
+    private String username;
+    private String password;
+    private String gender;
+    private String addr;
+
+    public User(int id, String username, String password, String gender, String addr) {
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.gender = gender;
+        this.addr = addr;
+    }
+
+    public User() {
+
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getGender() {
+        return gender;
+    }
+
+    public void setGender(String gender) {
+        this.gender = gender;
+    }
+
+    public String getAddr() {
+        return addr;
+    }
+
+    public void setAddr(String addr) {
+        this.addr = addr;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                ", gender='" + gender + '\'' +
+                ", addr='" + addr + '\'' +
+                '}';
+    }
+}
+
+```
+~~~
\ No newline at end of file
-- 
Gitee


From 7a4448ae7fe378a280c5304bcc17f130e72b4f73 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E6=99=BA=E7=BF=94?= <2045602860@qq.com>
Date: Mon, 25 Dec 2023 13:43:21 +0000
Subject: [PATCH 4/4] =?UTF-8?q?34=20=E5=88=98=E6=99=BA=E7=BF=94?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 刘智翔 <2045602860@qq.com>
---
 ...36\345\210\240\346\224\271\346\237\245.md" | 386 ++++++++++++++++++
 .../mybatis\347\273\203\344\271\240.md"       | 280 +++++++++++++
 2 files changed, 666 insertions(+)
 create mode 100644 "34 \345\210\230\346\231\272\347\277\224/mybatis\345\242\236\345\210\240\346\224\271\346\237\245.md"
 create mode 100644 "34 \345\210\230\346\231\272\347\277\224/mybatis\347\273\203\344\271\240.md"

diff --git "a/34 \345\210\230\346\231\272\347\277\224/mybatis\345\242\236\345\210\240\346\224\271\346\237\245.md" "b/34 \345\210\230\346\231\272\347\277\224/mybatis\345\242\236\345\210\240\346\224\271\346\237\245.md"
new file mode 100644
index 0000000..9bb7c9d
--- /dev/null
+++ "b/34 \345\210\230\346\231\272\347\277\224/mybatis\345\242\236\345\210\240\346\224\271\346\237\245.md"	
@@ -0,0 +1,386 @@
+```
+笔记
+
+
+使用Mapper代理方式，必须满足以下要求：
+1.定义与SQL映射文件同名的Mapper接口，
+2.在 Mapper 接口中定义方法，方法名就是SQL映射文件中sql语句的id，并保持
+参数类型和返回值类型一致
+
+- namespace:名称空间。必须是对应接口的全限定名 >
+<mapper namespace="com.mdd.mapper.UserMapper">
+<select id="selectAll"
+resultType="com.itheima.pojo.User">
+select * from tb_user;
+/select>
+/mapper>
+<mappers>
+-加载sql映射文件 >
+<mapper resource="com/mdd/mapper/UserMapper.xml" >
+-Mapper代理方式 >
+-<package name="com.mdd.mapper" > >
+/mappers>
+/3. 执行sql
+/3.1 获取UserMapper接口的代理对象
+UserMapper userMapper =
+sqlSession.getMapper(UserMapper.class);
+List<User> users = userMapper.selectAll();
+3.设置SQL映射文件的namespace属性为Mapper接口全限定名
+4.核心配置文件中的mapper路径要根据sql映射文件的实际路径改变（具体文件或
+包扫描）
+5.执行sql的方法改成getMapper()的方法
+import com.mdd.pojo.Brand;
+
+import com.okk.mapper.BrandMapper;
+import com.okk.mapper.UserMapper;
+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 java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+public class App2 {
+    @Test
+    public void selectAll() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            List<Brand> brands = mapper.selectAll();
+            System.out.println(brands);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("查询成功");
+            }
+        }
+    }
+
+    @Test
+    public void selectId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            Brand brand = mapper.selectId(2);
+            System.out.println(brand);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("查询成功");
+            }
+        }
+    }
+    @Test
+    public  void deleteId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            mapper.deleteId(4);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("删除成功");
+            }
+        }
+    }
+
+    @Test
+    public  void updateId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            Brand brand = new Brand();
+            brand.setId(3);
+//            brand.setBrandName("vivo");
+//            brand.setCompanyName("vivo技术有限公司");
+//            brand.setOrdered(100);
+            brand.setDescription("v我500");
+            brand.setStatus(0);
+
+            mapper.update(brand);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("修改成功");
+            }
+        }
+    }
+    @Test
+    public  void insert() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag = true;
+        try {
+
+
+            Brand brand = new Brand();
+
+            brand.setBrandName("鸿星尔克");
+            brand.setCompanyName("鸿星尔克有限公司");
+            brand.setOrdered(100);
+            brand.setDescription("出生买的鞋昨天刚坏");
+            brand.setStatus(0);
+
+
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            mapper.insert(brand);
+
+
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag = false;
+        } finally {
+            sqlSession.commit();
+            sqlSession.close();
+            if (flag) {
+                System.out.println("新建成功");
+            }
+        }
+    }
+
+    @Test
+    public  void selectByCondition() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+
+
+
+        boolean flag=true;
+        try {
+            String companyName="华为";
+            String brandName="华为";
+            companyName='%'+companyName+'%';
+            brandName='%'+brandName+'%';
+
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            List<Brand> brands = mapper.selectByCondition(1, companyName, brandName);
+            System.out.println(brands);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("查询成功");
+            }
+        }
+    }
+
+    @Test
+    public  void selectByConditionSingle() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+
+
+        boolean flag = true;
+        try {
+            String companyName = "华为";
+            String brandName = "华为";
+            companyName = '%' + companyName + '%';
+            brandName = '%' + brandName + '%';
+
+            Brand brand = new Brand();
+            brand.setCompanyName(companyName);
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            List<Brand> brands = mapper.selectByConditionSingle(brand);
+            System.out.println(brands);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag = false;
+        } finally {
+            sqlSession.close();
+            if (flag) {
+                System.out.println("查询成功");
+            }
+        }
+
+    }
+    @Test
+    public  void deleteByIds() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+        int[] ids = {1,2};
+
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            mapper.deleteByIds(ids);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("删除成功");
+            }
+        }
+    }
+    }
+<?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.okk.mapper.BrandMapper">
+<resultMap id="brandResultMap" type="com.mdd.pojo.Brand">
+    <result column="brand_name" property="brandName"/>
+    <result column="company_name" property="companyName"/>
+</resultMap>
+    <insert id="insert" useGeneratedKeys="true" keyProperty="id">-- f返回主键
+
+        insert into tb_brand(brand_name,company_name,ordered,description,status) values (#{brandName},#{companyName},#{ordered},#{description},#{status})
+
+    </insert>
+
+
+    <select id="selectAll" resultMap="brandResultMap" >
+        select * from tb_brand
+
+    </select>
+    <select id="selectId" resultMap="brandResultMap">
+        select * from tb_brand where id=#{id}
+
+    </select>
+    <select id="selectByCondition" resultMap="brandResultMap">
+        select * from tb_brand
+    <where>
+        <if test="status!=null and status !=''">
+            status=#{status}
+        </if>
+        <if test="companyName!=null and companyName !=''">
+            and company_name like #{companyName}
+        </if>
+        <if test="brandName!=null and brandName !=''">
+            and brand_name like #{brandName}
+        </if>
+
+    </where>
+
+
+    </select>
+    <select id="selectByConditionSingle" resultMap="brandResultMap">
+        select * from tb_brand
+    <where>
+        <choose>
+            <when test="status!=null and status !=''">
+                status=#{status}
+            </when>
+            <when test="companyName!=null and companyName !=''">
+                company_name like #{companyName}
+            </when>
+            <when test="brandName!=null and brandName !=''">
+                brand_name like #{brandName}
+            </when>
+        </choose>
+    </where>
+
+
+    </select>
+<!--    <delete id="deleteId">-->
+<!--        delete from tb_brand where id=#{id}-->
+<!--    </delete>-->
+
+    <delete id="deleteByIds">
+        delete from tb_brand where id in( <foreach collection="array" item="id" separator=",">
+        #{id}
+    </foreach>);
+    </delete>
+
+    <update id="update">
+        update tb_brand
+    <set>
+        <if test="brandName!=null and brandName !=''">
+            brand_name= #{brandName},
+        </if>
+        <if test="companyName!=null and companyName !=''">
+            company_name= #{companyName},
+        </if>
+        <if test="ordered!=null and ordered !=''">
+            ordered= #{ordered},
+        </if>
+        <if test="description!=null and description !=''">
+            description= #{description},
+        </if>
+        <if test="status!=null and status !=''">
+            status= #{status},
+        </if>
+    </set>
+        where id=#{id};
+    </update>
+</mapper>
+```
\ No newline at end of file
diff --git "a/34 \345\210\230\346\231\272\347\277\224/mybatis\347\273\203\344\271\240.md" "b/34 \345\210\230\346\231\272\347\277\224/mybatis\347\273\203\344\271\240.md"
new file mode 100644
index 0000000..3b5f224
--- /dev/null
+++ "b/34 \345\210\230\346\231\272\347\277\224/mybatis\347\273\203\344\271\240.md"	
@@ -0,0 +1,280 @@
+笔记：
+
+```
+使用Mapper代理方式，必须满足以下要求：
+1.定义与SQL映射文件同名的Mapper接口，
+2.在 Mapper 接口中定义方法，方法名就是SQL映射文件中sql语句的id，并保持
+参数类型和返回值类型一致
+- namespace:名称空间。必须是对应接口的全限定名 >
+<mapper namespace="com.mdd.mapper.UserMapper">
+<select id="selectAll"
+resultType="com.itheima.pojo.User">
+select * from tb_user;
+/select>
+/mapper>
+<mappers>
+-加载sql映射文件 >
+<mapper resource="com/mdd/mapper/UserMapper.xml" >
+-Mapper代理方式 >
+-<package name="com.mdd.mapper" > >
+/mappers>
+/3. 执行sql
+/3.1 获取UserMapper接口的代理对象
+UserMapper userMapper =
+sqlSession.getMapper(UserMapper.class);
+List<User> users = userMapper.selectAll();
+3.设置SQL映射文件的namespace属性为Mapper接口全限定名
+4.核心配置文件中的mapper路径要根据sql映射文件的实际路径改变（具体文件或
+包扫描）
+5.执行sql的方法改成getMapper()的方法
+```
+
+作业：
+
+App2：
+
+```
+import com.mdd.pojo.Brand;
+
+import com.okk.mapper.BrandMapper;
+import com.okk.mapper.UserMapper;
+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 java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+public class App2 {
+    @Test
+    public void selectAll() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            List<Brand> brands = mapper.selectAll();
+            System.out.println(brands);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("查询成功");
+            }
+        }
+    }
+
+    @Test
+    public void selectId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            Brand brand = mapper.selectId(2);
+            System.out.println(brand);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("查询成功");
+            }
+        }
+    }
+    @Test
+    public  void deleteId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            mapper.deleteId(1);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("删除成功");
+            }
+        }
+    }
+
+    @Test
+    public  void updateId() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession(true);
+
+
+
+        boolean flag=true;
+        try {
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            Brand brand = new Brand();
+            brand.setId(3);
+            brand.setBrandName("vivo");
+            brand.setCompanyName("vivo技术有限公司");
+            brand.setOrdered(100);
+            brand.setDescription("v我50");
+            brand.setStatus(0);
+
+            mapper.update(brand);
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag=false;
+        }  finally {
+            sqlSession.close();
+            if (flag){
+                System.out.println("修改成功");
+            }
+        }
+    }
+    @Test
+    public  void insert() throws IOException {
+        //1. 加载mybatis的核心配置文件，获取 SqlSessionFactory
+        String resource = "mybatis-config.xml";
+
+        InputStream inputStream = Resources.getResourceAsStream(resource);
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
+        SqlSession sqlSession = build.openSession();
+
+
+        boolean flag = true;
+        try {
+
+
+            Brand brand = new Brand();
+
+            brand.setBrandName("鸿星尔克");
+            brand.setCompanyName("鸿星尔克有限公司");
+            brand.setOrdered(100);
+            brand.setDescription("出生买的鞋昨天刚坏");
+            brand.setStatus(0);
+
+
+            BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
+            mapper.insert(brand);
+
+
+            // 可能抛出异常的代码
+        } catch (Exception e1) {
+            System.out.println(e1);
+            flag = false;
+        } finally {
+            sqlSession.commit();
+            sqlSession.close();
+            if (flag) {
+                System.out.println("新建成功");
+            }
+        }
+    }
+}
+```
+
+mybatis—config：
+
+```
+<?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>
+    <properties resource="jdbc.properties"></properties>
+    <typeAliases>
+<!--给pojo类设置别名-->
+<package name="com/mdd/pojo"/>
+    </typeAliases>
+    <environments default="developmentBrand">
+        <environment id="development">
+            <transactionManager type="JDBC"/>
+            <dataSource type="POOLED">
+                <property name="driver" value="${jdbc.driver}"/>
+                <property name="url" value="${jdbc.url}"/>
+                <property name="username" value="${jdbc.username}"/>
+                <property name="password" value="${jdbc.password}"/>
+            </dataSource>
+        </environment>
+        <environment id="developmentBrand">
+            <transactionManager type="JDBC"/>
+            <dataSource type="POOLED">
+                <property name="driver" value="${jdbc.driver2}"/>
+                <property name="url" value="${jdbc.url2}"/>
+                <property name="username" value="${jdbc.username2}"/>
+                <property name="password" value="${jdbc.password2}"/>
+            </dataSource>
+        </environment>
+    </environments>
+    <mappers>
+<!--        <mapper resource="UserMapper.xml"/>-->
+
+        <package name="com.okk.mapper"/>
+    </mappers>
+</configuration>
+```
+
+BrandMapper：
+
+```
+package com.okk.mapper;
+
+
+import com.mdd.pojo.Brand;
+import com.mdd.pojo.User;
+
+import java.util.List;
+
+public interface BrandMapper {
+     List<Brand> selectAll();
+      Brand selectId(int id);
+      void deleteId(int id);
+      void update(Brand brand);
+}
+```
+
+jdbc.properties:
+
+```java
+jdbc.driver = com.mysql.cj.jdbc.Driver
+jdbc.url = jdbc:mysql:///mybatis?useSSL=false
+jdbc.username = root
+jdbc.password = root
+
+jdbc.driver2 = com.mysql.cj.jdbc.Driver
+jdbc.url2 = jdbc:mysql:///brand2?useSSL=false
+jdbc.username2 = root
+jdbc.password2 = root
+```
\ No newline at end of file
-- 
Gitee