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<div id="app" data-server-rendered="true"><div class="theme-container no-sidebar"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><!----> <span class="site-name">测试</span></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <!----></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><!----> <!----> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="数据库的链接与创建"><a href="#数据库的链接与创建" class="header-anchor">#</a> 数据库的链接与创建</h1> <p>先看下如何连接数据库，安装完成之后，用windows键 就是徽标键 + r键，打开运行，输入cmd然后回车</p> <p><img src="/assets/img/7809b6c265ba80888a4c95a5408ce43acbe4e6d7cbb8726199a07c5a3b2eaa14.85869146.png" alt="图 1"></p> <p>然后输入<code>mysql -uroot -p</code> ，然后回车</p> <p><img src="/assets/img/3fd6e19a87b86f06de742f498a5f04af1872ed6b11203ef63073eff799dd7b65.9a9f30ad.png" alt="图 2"></p> <p>然后输入你安装时候输入的密码，然后回车</p> <p><img src="/assets/img/7129161c3e27345a6643cc2cc364ba9a09f8bb684dc12f6b091be788b2a44405.3dcecb59.png" alt="图 3"></p> <p>这样就连接到数据库了</p> <h2 id="查看所有数据库"><a href="#查看所有数据库" class="header-anchor">#</a> 查看所有数据库</h2> <p>之前说了，mysql中有数据库与数据表，数据库中包含着数据表。</p> <p>那么如何查看现在存在的数据库呢？</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">show</span> <span class="token keyword">databases</span><span class="token punctuation">;</span>
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</code></pre></div><p>使用上面的命令可以查看当前存在的数据库。</p> <p><img src="data:image/png;base64,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" alt="图 4"></p> <blockquote><p>注意，每条语句后面必须跟;结尾，而且保证是英文的分号</p></blockquote> <p>每个刚安装好的mysql都会有自带的这四个数据库，一般我们不会修改他们，之后用到的时候在进行解释，如果随便修改他们会造成一些意料之外的事情。</p> <p>所以我们如何创建我们自己的数据库呢？</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">create</span> <span class="token keyword">database</span> demo<span class="token punctuation">;</span>
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</code></pre></div><p>上面的命令是创建了一个名字为demo的数据库</p> <p>那么名字是怎么定义的呢？</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">create</span> <span class="token keyword">database</span> 这里就是数据库的名字<span class="token punctuation">;</span>
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</code></pre></div><p>比如我们要创建一个叫school的数据库，就应该使用</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">create</span> <span class="token keyword">database</span> school<span class="token punctuation">;</span>
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</code></pre></div><p>那么我们运行<code>create database demo;</code>之后，再次查看数据库会怎么样？</p> <p><img 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" alt="图 5"></p> <p>发现数据库列表多了一个demo</p> <p>我们执行下<code>create database school;</code>会怎么样呢？</p> <p><img src="data:image/png;base64,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" alt="图 6"></p> <p>school数据库也出现了。</p> <p>所以这就是创建数据库的方法。</p> <p>数据库创建好了，那么如何创建表呢？</p> <p>之前说了，表是存在于数据库里面的，我们创建的时候应该指定要在哪个数据库中创建，就是新建文件一样，我们需要打开要新建文件的文件夹。</p> <p>所以如何打开数据库呢？</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">use</span> 数据库名<span class="token punctuation">;</span>
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</code></pre></div><p>使用use来选择要操作的数据库。</p> <p>比如我们要在school数据库里面创建一个class的表，那么我们就应该先使用use来选择school这个数据库</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">use</span> school<span class="token punctuation">;</span>
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</code></pre></div><p><img src="data:image/png;base64,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" alt="图 7"></p> <p>使用use之后会出现<code>Database changed</code> 就是数据库已经选择了，可以进行之后的操作了。</p> <p>那么先查看一下有没有数据表，因为是新建立的数据库，所以应该是空白的。</p> <p>那么如何查看呢？</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">show</span> <span class="token keyword">tables</span><span class="token punctuation">;</span>
|
||
</code></pre></div><p><img src="data:image/png;base64,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" alt="图 8"></p> <p>并没有出现什么，因为最初创建的数据库是空白的，我们应该新建一个表。</p> <p>如何创建一个表呢,是跟创建数据库一样直接<code>create table 表名;</code>吗？</p> <p>并不是，介绍的时候有说到，数据表包含</p> <ul><li>表名</li> <li>表字段名</li> <li>字段类型</li> <li>约束等等</li></ul> <h2 id="类型"><a href="#类型" class="header-anchor">#</a> 类型</h2> <p>那么我们先看一下类型。</p> <blockquote><p>MySQL支持多种类型，大致可以分为三类：数值、日期/时间和字符串(字符)类型。</p></blockquote> <p>数值是 int float double等
|
||
字符串是 varchar char text等
|
||
日期时间是 date datetime等</p> <p>下面详细介绍一下，</p> <p>int 是整数，可以存放一些整数的值 比如 123 2345 这种整数等 范围是(-2 147 483 648，2 147 483 647)
|
||
float 是小数，是存放小数的，可以存放小数 比如 3.14 2.345 等等 可以有6 - 7 位的准确值
|
||
double 是双精度小数型，也是存放小数 但是精准度比float好，可以保证 15 - 16 为准确性
|
||
data 是存放日期的，格式为YYYY-MM-DD，例如 2020-02-02 2021-04-29 等等
|
||
datatime 存放日期时间的 格式为YYYY-MM-DD HH:MM:SS 例如 2020-02-02 02:02:02 就是年-月-日 时:分:秒
|
||
char 定长字符串，定义的时候需要传入长度，char(10) 定义一个长度为10的字符类型
|
||
varchar 变长字符串，与char一样，但是有一些区别，在下面解释</p> <h3 id="char-与-varchar"><a href="#char-与-varchar" class="header-anchor">#</a> char 与 varchar</h3> <ol><li><p>char类型时定长的类型，即当定义的是char(10)，输入的是"abc"这三个字符时，它们占的空间一样是10个字节，包括7个空字节。当输入的字符长度超过指定的数时，char会截取超出的字符。而且，当存储char值时，MySQL是自动删除输入字符串末尾的空格。</p></li> <li><p>char是适合存储很短的、一般固定长度的字符串。例如，char非常适合存储密码的MD5值，因为这是一个定长的值。对于非常短的列，char比varchar在存储空间上也更有效率。</p></li> <li><p>varchar(n)类型用于存储可变长的，比如varchar(10), 然后输入abc三个字符，那么实际存储大小为3个字节。</p></li> <li><p>所以，从空间上考虑，varcahr较合适；从效率上考虑，用char合适。二者之间需要权衡。</p></li></ol> <h2 id="创建数据表"><a href="#创建数据表" class="header-anchor">#</a> 创建数据表</h2> <p>那么如何简单的创建一个表呢？</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">create</span> <span class="token keyword">table</span> 表名<span class="token punctuation">(</span>字段 类型<span class="token punctuation">,</span>字段 类型<span class="token punctuation">,</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
</code></pre></div><p>例如，我们要创建一个下面样式的表</p> <p><img src="data:image/png;base64,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" alt="图 9"></p> <p>我们先考虑一下名字与类型，因为数据库中不能用中文作为字段名，所以我们需要给起一个英文名</p> <ul><li>姓名 name 类型是 varchar 长度给10 因为名字是字符串 并且没有人会有10个字的名字，可能会有5个6个.</li> <li>性别 sex 类型是varchar 长度给2 性别一般是男 女 未知，在一般项目中可能会用数字代替。</li> <li>年龄 age 类型 int</li></ul> <p>那么我们接下来创建这个表，表名就叫class</p> <div class="language-sql extra-class"><pre class="language-sql"><code><span class="token keyword">create</span> <span class="token keyword">table</span> class<span class="token punctuation">(</span>name <span class="token keyword">varchar</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">,</span>sex <span class="token keyword">varchar</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">,</span>age <span class="token keyword">int</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
</code></pre></div><p>执行一下</p> <p><img src="data:image/png;base64,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" alt="图 10"></p> <p>完成了，然后再查看一下当前数据库的表</p> <p><img src="data:image/png;base64,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" alt="图 11"></p> <p>已经可以看到我们创建的class了</p> <p>下节就是数据的增删改查了。</p></div> <footer class="page-edit"><!----> <!----></footer> <!----> </main></div><div class="global-ui"></div></div>
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