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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hexo</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta property="og:type" content="website">
<meta property="og:title" content="Hexo">
<meta property="og:url" content="http://example.com/index.html">
<meta property="og:site_name" content="Hexo">
<meta property="og:locale" content="en_US">
<meta property="article:author" content="John Doe">
<meta name="twitter:card" content="summary">
<link rel="alternate" href="/atom.xml" title="Hexo" type="application/atom+xml">
<link rel="shortcut icon" href="/favicon.png">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/index.min.css">
<link rel="stylesheet" href="/css/style.css">
<link rel="stylesheet" href="/fancybox/jquery.fancybox.min.css">
<meta name="generator" content="Hexo 6.0.0"></head>
<body>
<div id="container">
<div id="wrap">
<header id="header">
<div id="banner"></div>
<div id="header-outer" class="outer">
<div id="header-title" class="inner">
<h1 id="logo-wrap">
<a href="/" id="logo">Hexo</a>
</h1>
</div>
<div id="header-inner" class="inner">
<nav id="main-nav">
<a id="main-nav-toggle" class="nav-icon"></a>
<a class="main-nav-link" href="/">Home</a>
<a class="main-nav-link" href="/archives">Archives</a>
</nav>
<nav id="sub-nav">
<a id="nav-rss-link" class="nav-icon" href="/atom.xml" title="RSS Feed"></a>
<a id="nav-search-btn" class="nav-icon" title="Search"></a>
</nav>
<div id="search-form-wrap">
<form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form"><input type="search" name="q" class="search-form-input" placeholder="Search"><button type="submit" class="search-form-submit"></button><input type="hidden" name="sitesearch" value="http://example.com"></form>
</div>
</div>
</div>
</header>
<div class="outer">
<section id="main">
<article id="post-javaweb400-500笔记" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2022/05/25/javaweb400-500%E7%AC%94%E8%AE%B0/" class="article-date">
<time class="dt-published" datetime="2022-05-25T14:53:52.000Z" itemprop="datePublished">2022-05-25</time>
</a>
</div>
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2022/05/25/javaweb400-500%E7%AC%94%E8%AE%B0/">javaweb400-500笔记</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p>主要了解案例</p>
</div>
<footer class="article-footer">
<a data-url="http://example.com/2022/05/25/javaweb400-500%E7%AC%94%E8%AE%B0/" data-id="cl3lpkcmo000394v75r938ra8" data-title="javaweb400-500笔记" class="article-share-link">Share</a>
<ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/1-0-0/" rel="tag">1.0.0</a></li></ul>
</footer>
</div>
</article>
<article id="post-javaweb300-400笔记" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2022/05/25/javaweb300-400%E7%AC%94%E8%AE%B0/" class="article-date">
<time class="dt-published" datetime="2022-05-25T14:50:19.000Z" itemprop="datePublished">2022-05-25</time>
</a>
</div>
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2022/05/25/javaweb300-400%E7%AC%94%E8%AE%B0/">javaweb300-400笔记</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p>了解大量案例</p>
<p>filter和listener的了解</p>
</div>
<footer class="article-footer">
<a data-url="http://example.com/2022/05/25/javaweb300-400%E7%AC%94%E8%AE%B0/" data-id="cl3lpkcmo000594v7ecdf0ozc" data-title="javaweb300-400笔记" class="article-share-link">Share</a>
<ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/1-0-0/" rel="tag">1.0.0</a></li></ul>
</footer>
</div>
</article>
<article id="post-javaweb200-300笔记 " class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2022/05/25/javaweb200-300%E7%AC%94%E8%AE%B0%20/" class="article-date">
<time class="dt-published" datetime="2022-05-25T14:49:26.000Z" itemprop="datePublished">2022-05-25</time>
</a>
</div>
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2022/05/25/javaweb200-300%E7%AC%94%E8%AE%B0%20/">javaweb200-300笔记</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p>xml的学习</p>
<p>Tomcat的使用</p>
<p>登录的案例</p>
<p>跳过了jsp</p>
</div>
<footer class="article-footer">
<a data-url="http://example.com/2022/05/25/javaweb200-300%E7%AC%94%E8%AE%B0%20/" data-id="cl3lpkcmn000294v7ajwl47zf" data-title="javaweb200-300笔记" class="article-share-link">Share</a>
<ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/1-0-0/" rel="tag">1.0.0</a></li></ul>
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</article>
<article id="post-javaweb100-200笔记" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2022/05/25/javaweb100-200%E7%AC%94%E8%AE%B0/" class="article-date">
<time class="dt-published" datetime="2022-05-25T00:28:22.000Z" itemprop="datePublished">2022-05-25</time>
</a>
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<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2022/05/25/javaweb100-200%E7%AC%94%E8%AE%B0/">javaweb100-200笔记</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p>100-168是前端知识，相当于再复习一遍，暂不做笔记，啥忘了查啥</p>
<p>重点学习了ECMAScript、BOM、DOM</p>
<p>了解了bootstrap的使用</p>
</div>
<footer class="article-footer">
<a data-url="http://example.com/2022/05/25/javaweb100-200%E7%AC%94%E8%AE%B0/" data-id="cl3kup61y0000cwv73ru9fmhu" data-title="javaweb100-200笔记" class="article-share-link">Share</a>
<ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/1-0-0/" rel="tag">1.0.0</a></li></ul>
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<article id="post-javaweb1-100笔记" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2022/05/23/javaweb1-100%E7%AC%94%E8%AE%B0/" class="article-date">
<time class="dt-published" datetime="2022-05-22T16:00:00.000Z" itemprop="datePublished">2022-05-23</time>
</a>
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<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2022/05/23/javaweb1-100%E7%AC%94%E8%AE%B0/">javaweb1-100笔记</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p> <strong>mysql服务启动：</strong></p>
<p>cmd,services.msc</p>
<p> 管理员cmd,net start/stop mysql</p>
<p><strong>登录：</strong></p>
<p> mysql -uroot -p（本地）</p>
<p> mysql -hip -u -p</p>
<p><strong>退出：</strong></p>
<p> exit/quit</p>
<p><strong>目录结构：</strong></p>
<p> mysql安装目录</p>
<p> 配置文件 my.ini</p>
<p> 数据目录：C:\ProgramData\MySQL\MySQL Server 5.5\data</p>
<p><strong>sql通用语法</strong></p>
<p> 每条 SQL 语句的末端使用分号</p>
<p> 单行注释：– （）含空格</p>
<p> # </p>
<p> 多行注释：/* */</p>
<p><strong>sql分类：</strong></p>
<p> DDL（操作数据表、库）</p>
<p> DQL（查询表中数据）</p>
<p> DML（增删改表中的数据） </p>
<p> DCL（授权）</p>
<p><strong>DDL</strong></p>
<p> 操作数据库：CRUD</p>
<p> <em>Create</em>：create databases 名称；</p>
<p> create databases if not exists 名称；</p>
<p> create databases 名称 character set 字符集；</p>
<p> 先判断</p>
<p> <em>Retriece</em>：查询 show databases;</p>
<p> 查询字符集 show create databases 名称；</p>
<p> <em>Update</em>：修改字符集 alter databases 名称 character set 字符集；</p>
<p> <em>Delete</em>: drop databases 名称</p>
<p> drop databases if exists 名称；</p>
<p> 使用数据库：查询当前正在使用的数据库：select databases();</p>
<p> use 名称；</p>
<p> 操作表：</p>
<p> <em>C</em>：create table 表名（</p>
<p> 列名1 数据类型1，</p>
<p> 列名2 数据类型2，</p>
<p> …</p>
<p> 列名 数据类型</p>
<p> ）；</p>
<p> 数据库类型：<a target="_blank" rel="noopener" href="https://www.runoob.com/sql/sql-datatypes-general.html">https://www.runoob.com/sql/sql-datatypes-general.html</a></p>
<p> varchar 字符串类型</p>
<p> 复制表： create table 表名 like 表名；</p>
<p> <em>R</em>：查询所有表名： show tables;、</p>
<p> 查询表结构：desc 表名；</p>
<p> <em>U</em>：修改表名： alter table 表名 rename to 新表名；</p>
<p> 修改表的字符集：alter table 表名 character set 字符集； </p>
<p> 添加一列：alter tbale 表名 add 列名 数据类型；</p>
<p> 修改列名称 类型：alter tbale 表名 change 列名 新列名 新数据类型；</p>
<p> alter tbale 表名 modify 列名 新数据类型；</p>
<p> 删除一列：alter table 表名 drop 列名;</p>
<p> <em>D</em>：drop table (if exists) 表名;</p>
<p><strong>DML:</strong></p>
<p> <em>添加数据</em>：insert into 表名（列1，列2…） values(值1，值2 ….)；</p>
<p> 除数字外用引号 </p>
<p> <em>删除数据</em>：delete from 表名 where 条件；</p>
<p> 如果不加条件删除所有表中数据</p>
<p> truncate table 表名；(先删除表再创建一个一样的空表，效率更高)</p>
<p> <em>修改数据</em>：update 表名 set 列名1 = 值1，…. [ where 条件]；</p>
<p> 不加条件则会将表中所有记录全部修改</p>
<p><strong>DQL：</strong></p>
<p> <strong>语法：</strong></p>
<p> select</p>
<p> 字段列表</p>
<p> from</p>
<p> 表名列表</p>
<p> where</p>
<p> 条件列表</p>
<p> group by</p>
<p> 分组字段</p>
<p> having</p>
<p> 分组之后的条件</p>
<p> order by</p>
<p> 排序</p>
<p> limit</p>
<p> 分页限定</p>
<p> <strong>基础查询：</strong></p>
<p> 多个字段的查询</p>
<p> select 字段1，字段2 from 表名；</p>
<p> select * from 表名；</p>
<p> 去除重复的结果集</p>
<p> select distinct 字段名 from 表名；</p>
<p> as 起别名（可空格）</p>
<p> 计算列</p>
<p> ifnull(表达式1，表达式2) – 替换值</p>
<p> <strong>条件查询</strong>：</p>
<p> 运算符： > < <= >= = <> !=</p>
<p> between .. and … (在2值之间，包括头尾)</p>
<p> like’张%’ 模糊查询 </p>
<p> _ 任意一个字符</p>
<p> % 任意多个字符</p>
<p> is null / is not null 不能写=null </p>
<p> and && or || not ! </p>
<p> <strong>排序查询</strong>：</p>
<p> order by 排序字段1 排序方式1 ，… – 默认升序</p>
<p> ASC：升序</p>
<p> DESC： 降序</p>
<p> <strong>聚合函数</strong>：</p>
<p> 进行列的计算（排除null的值）</p>
<p> count:计算个数</p>
<p> max、min、sum、avg</p>
<p> 例：</p>
<p> select count(字段名) from 表名；</p>
<p> select count(ifnull(字段名,0)) from 表名；</p>
<p> select count(*) from 表名；</p>
<p> <strong>分组查询</strong>：</p>
<p> group by 分组字段；</p>
<p> <strong>注意：分组之后查询的字段：分组字段、聚合函数</strong></p>
<p> where 和having 的区别：</p>
<p> where 在分组前限定，having在分组后限定</p>
<p> where后不跟聚合函数，having 可以</p>
<p> <strong>分页查询</strong>：</p>
<p> limit 开始的索引，每页查询的条数；</p>
<p> 开始的索引 = （当前页码 - 1）*每页显示的条数</p>
<p><strong>DCL：</strong> 管理用户，授权</p>
<p><strong>约束</strong></p>
<p> <strong>主键约束</strong>：primary key 含义：非空且唯一</p>
<p> 创建表时添加主键 数据类型后加primary key </p>
<p> 删除主键 alter table 表名 drop primary key;</p>
<p> 创建完后添加 alter table 表名 modify 字符名 数据类型 primary key; </p>
<p> <strong>自动增长</strong> key 后面加 auto_increment</p>
<p> 删除/添加自动增长 alter table 表名 modify 字符名 数据类型（auto_increment）;</p>
<p> <strong>非空约束</strong>：not null</p>
<p> 创建表时添加非空约束（在数据类型后加 not null）</p>
<p> 创建完表后添加非空约束 alter table 表名 modify 字符名 数据类型 not null；– 删除则不写not null</p>
<p> <strong>唯一约束</strong>：unique</p>
<p> 创建表时添加唯一约束（在数据类型后加 unique） </p>
<p> 创建完表后添加唯一约束 alter table 表名 modify 字符名 数据类型 unique；</p>
<p> <strong>删除唯一约束： alter table 表名 drop index 字符名;</strong></p>
<p> <strong>外键约束</strong>：foreign key </p>
<p> 创建表时添加外键：</p>
<p> create table 表名（</p>
<p> ….</p>
<p> 外键列</p>
<p> comstraint 外键名称 foreign key (外键列名称) refernces 主表名称（主表列名称）</p>
<p> ）；</p>
<p> <strong>删除外键</strong>：alter table 表名 drop foreign key 外键名称；</p>
<p> <strong>添加外键</strong>：alter table 表名 add comstraint 外键名称 foreign key (外键列名称) refernces 主表名称（主表列名称）;</p>
<p> **设置级联更新(删除)**：alter table 表名 add comstraint 外键名称 foreign key (外键列名称) refernces 主表名称（主表列名称） on update（delete） cascade;</p>
<p> <strong>范式</strong></p>
<p> </p>
<p><strong>多表查询</strong></p>
<p> <strong>内连接查询：</strong></p>
<p> <strong>隐式：</strong> where …..</p>
<p> <strong>显式：</strong> select 字段列表 from 表名1 [inner] join 表名2 on 条件；</p>
<p> <strong>外连接查询：</strong> </p>
<p> <strong>左外连接：</strong> select 字段列表 from 表1left [outer] join 表2 on 条件；</p>
<p> 查询左表所有数据以及右表交集部分</p>
<p> <strong>右外连接：</strong> select 字段列表 from 表1 right [outer] join 表2 on 条件；</p>
<p> <strong>子查询：</strong> 查询中嵌套查询</p>
<p> 1.子查询的结果单行单列</p>
<p> 可作为条件使用运算符判断</p>
<p> 2.子查询结果多行单列</p>
<p> 使用运算符in判断</p>
<p> 3.多行多列</p>
<p> 子查询可以作为一张虚拟表</p>
<p><strong>事务：</strong></p>
<p> 开启事务：start transaction;</p>
<p> 回滚：rollback;</p>
<p> 提交：commit;</p>
<p> 原子性、持久性、隔离性、一致性</p>
<p> 隔离级别（暂做了解，忘了网上再查）</p>
<h4 id="JDBC"><a href="#JDBC" class="headerlink" title="JDBC:"></a>JDBC:</h4><p> java database connectivity Java数据库连接</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"> import org.junit.Test;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * JDBC的入门程序</span><br><span class="line"> * @author jt</span><br><span class="line"> *</span><br><span class="line"> */</span><br><span class="line">public class JDBCDemo1 {</span><br><span class="line"></span><br><span class="line"> @Test</span><br><span class="line"> /**</span><br><span class="line"> * JDBC的入门</span><br><span class="line"> */</span><br><span class="line"> public void demo1() throws Exception{</span><br><span class="line"> // 1.加载驱动</span><br><span class="line"> Class.forName("com.mysql.jdbc.Driver");</span><br><span class="line"> // 2.获得连接</span><br><span class="line"> Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/web_test3", "root", "abc");</span><br><span class="line"> // 3.基本操作：执行SQL</span><br><span class="line"> // 3.1获得执行SQL语句的对象</span><br><span class="line"> Statement statement = conn.createStatement();</span><br><span class="line"> // 3.2编写SQL语句:</span><br><span class="line"> String sql = "select * from user";</span><br><span class="line"> // 3.3执行SQL:</span><br><span class="line"> ResultSet rs = statement.executeQuery(sql);</span><br><span class="line"> // 3.4遍历结果集:</span><br><span class="line"> while(rs.next()){</span><br><span class="line"> System.out.print(rs.getInt("id")+" ");</span><br><span class="line"> System.out.print(rs.getString("username")+" ");</span><br><span class="line"> System.out.print(rs.getString("password")+" ");</span><br><span class="line"> System.out.print(rs.getString("nickname")+" ");</span><br><span class="line"> System.out.print(rs.getInt("age"));</span><br><span class="line"> System.out.println();</span><br><span class="line"> }</span><br><span class="line"> // 4.释放资源</span><br><span class="line"> rs.close();</span><br><span class="line"> statement.close();</span><br><span class="line"> conn.close();</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"> </span><br></pre></td></tr></table></figure>
<p>后续看笔记文件</p>
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<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
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