publicNote/week3.html at master · lungzeeyim/publicNote · GitHub

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<div id="content">
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#org208d794">1. TITLE Week 03</a>
<ul>
<li><a href="#orgd3fae04">1.1. SQL - Data Type</a>
<ul>
<li><a href="#org187ddbe">1.1.1. 前言</a></li>
<li><a href="#org15e1193">1.1.2. NULL</a></li>
<li><a href="#org5a8f6b0">1.1.3. INTEGER</a></li>
<li><a href="#org34f417a">1.1.4. REAL</a></li>
<li><a href="#org08906dd">1.1.5. TEXT</a></li>
<li><a href="#orgde1174b">1.1.6. Date and Time</a></li>
<li><a href="#org61380c5">1.1.7. BLOB</a></li>
<li><a href="#org8e6c6ae">1.1.8. NUMERIC</a></li>
<li><a href="#org3ac124e">1.1.9. Non SQLITE DATA TYPES</a></li>
</ul>
</li>
<li><a href="#orgabe181b">1.2. Sql - Python and Database</a>
<ul>
<li><a href="#org9ffb77e">1.2.1. How to 描绘represent a database in python</a></li>
<li><a href="#orgc69b6af">1.2.2. Sqlite to python</a></li>
<li><a href="#orgddd09a4">1.2.3. Type Checking</a></li>
<li><a href="#org2fc483c">1.2.4. rows横排</a></li>
<li><a href="#org77a07fe">1.2.5. Table</a></li>
<li><a href="#org2a692d3">1.2.6. Database</a></li>
<li><a href="#org66e4ce5">1.2.7. Project API</a></li>
<li><a href="#org2b9a60f">1.2.8. execute</a></li>
<li><a href="#org0487eab">1.2.9. Tokens记号</a></li>
<li><a href="#org552a69e">1.2.10. Text</a></li>
<li><a href="#org28b9da7">1.2.11. Store database</a></li>
</ul>
</li>
<li><a href="#org13de976">1.3. 时间</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-org208d794" class="outline-2">
<h2 id="org208d794"><span class="section-number-2">1</span> TITLE Week 03</h2>
<div class="outline-text-2" id="text-1">
</div><div id="outline-container-orgd3fae04" class="outline-3">
<h3 id="orgd3fae04"><span class="section-number-3">1.1</span> SQL - Data Type</h3>
<div class="outline-text-3" id="text-1-1">
</div><div id="outline-container-org187ddbe" class="outline-4">
<h4 id="org187ddbe"><span class="section-number-4">1.1.1</span> 前言</h4>
<div class="outline-text-4" id="text-1-1-1">
<ul class="org-ul">
<li>因为一个内部优化，没带有小数部分的浮点值和并存储在纵列有着真实的类(affinity)被写入硬盘以整数的形式，为了花更小的空间并且在读取的时候自动地转换回浮点数。这个优化是完全不可见的。只有通过检查数据文件raw bit（未经修改的字节）才能看出来。</li>
</ul>
</div>
</div>

<div id="outline-container-org15e1193" class="outline-4">
<h4 id="org15e1193"><span class="section-number-4">1.1.2</span> NULL</h4>
<div class="outline-text-4" id="text-1-1-2">
<ul class="org-ul">
<li>NULL是一个合法的值在任何的纵列。NULL是在任何数据类的领域之外的。</li>
<li>NULL通常代表了信息的缺乏或者不适用值</li>
<li>不建议使用null
<ol class="org-ol">
<li>nothing</li>
<li>false</li>
<li>0</li>
</ol></li>
</ul>
<div class="org-src-container">
<pre class="src src-sql">CREATE TABLE biaoge (name TEXT, number INTEGER);
INSERT INTO biaoge ('Ziyan Long', NULL);
</pre>
</div>
</div>
</div>

<div id="outline-container-org5a8f6b0" class="outline-4">
<h4 id="org5a8f6b0"><span class="section-number-4">1.1.3</span> INTEGER</h4>
<div class="outline-text-4" id="text-1-1-3">
<ul class="org-ul">
<li>有符INT有最多8bytes长（64bits) 1bytes = 8bits</li>
</ul>
</div>
</div>

<div id="outline-container-org34f417a" class="outline-4">
<h4 id="org34f417a"><span class="section-number-4">1.1.4</span> REAL</h4>
<div class="outline-text-4" id="text-1-1-4">
<ul class="org-ul">
<li>能够以小数(decimal)或者指数表示法表示</li>
<li>ex: 1.5 or 5.6E12.4</li>
</ul>
</div>
</div>

<div id="outline-container-org08906dd" class="outline-4">
<h4 id="org08906dd"><span class="section-number-4">1.1.5</span> TEXT</h4>
<div class="outline-text-4" id="text-1-1-5">
<ul class="org-ul">
<li>字符要用单引号</li>
<li>exmaple: 'I''m a string'</li>
</ul>
</div>
</div>

<div id="outline-container-orgde1174b" class="outline-4">
<h4 id="orgde1174b"><span class="section-number-4">1.1.6</span> Date and Time</h4>
<div class="outline-text-4" id="text-1-1-6">
<ul class="org-ul">
<li>文本: '年-月-日 小时:分钟:秒'</li>
<li>INTEGER 以unix时间</li>
</ul>
</div>
</div>

<div id="outline-container-org61380c5" class="outline-4">
<h4 id="org61380c5"><span class="section-number-4">1.1.7</span> BLOB</h4>
<div class="outline-text-4" id="text-1-1-7">
<ul class="org-ul">
<li>被用于存储任意二进制数据（通常有：图片，视频，或者其他非文字数据）</li>
<li>没有储存限制</li>
<li>很少用到在INSERT语句,更多用在变成语言api的parameterized(参数的)查询(query).</li>
</ul>
</div>
</div>

<div id="outline-container-org8e6c6ae" class="outline-4">
<h4 id="org8e6c6ae"><span class="section-number-4">1.1.8</span> NUMERIC</h4>
<div class="outline-text-4" id="text-1-1-8">
<ul class="org-ul">
<li>sqlite有另外一个类 NUMERIC</li>
<li>一个纵列能有NUMERIC类可以包含值去使用全部5种存储类.当文本数据被插入到NUMERIC纵列的时候,那个储存类属于文本会被转换成INT或者REAL.</li>
<li>如果前15个小数位被保留,那么TEXT和REAL之间的转换是无损的和可逆的.</li>
<li>如果text的无损转换不可能,那么值将会存成text,不尝试去转换.</li>
</ul>
</div>
</div>

<div id="outline-container-org3ac124e" class="outline-4">
<h4 id="org3ac124e"><span class="section-number-4">1.1.9</span> Non SQLITE DATA TYPES</h4>
<div class="outline-text-4" id="text-1-1-9">
<ul class="org-ul">
<li>Memo 能存有超多字符</li>
<li>Enum 受限字符串</li>
</ul>
</div>
</div>
</div>

<div id="outline-container-orgabe181b" class="outline-3">
<h3 id="orgabe181b"><span class="section-number-3">1.2</span> Sql - Python and Database</h3>
<div class="outline-text-3" id="text-1-2">
</div><div id="outline-container-org9ffb77e" class="outline-4">
<h4 id="org9ffb77e"><span class="section-number-4">1.2.1</span> How to 描绘represent a database in python</h4>
<div class="outline-text-4" id="text-1-2-1">
<ul class="org-ul">
<li>Project2要求
<ul class="org-ul">
<li>sqlite的输入和输出都需要一样风格</li>
</ul></li>
<li>剩下的需实现内容都是建议以一种方式实现</li>
</ul>
</div>
</div>

<div id="outline-container-orgc69b6af" class="outline-4">
<h4 id="orgc69b6af"><span class="section-number-4">1.2.2</span> Sqlite to python</h4>
<div class="outline-text-4" id="text-1-2-2">
<ul class="org-ul">
<li>类型等换:
<ul class="org-ul">
<li>NULL == None</li>
<li>INTEGER == int</li>
<li>REAL == float</li>
<li>fTEXT == str</li>
<li>BLOB == bytes</li>
</ul></li>
</ul>
</div>
</div>

<div id="outline-container-orgddd09a4" class="outline-4">
<h4 id="orgddd09a4"><span class="section-number-4">1.2.3</span> Type Checking</h4>
<div class="outline-text-4" id="text-1-2-3">
<ul class="org-ul">
<li>如果一个纵列被公告去有个类,那么每个元素在那个纵列都必须一致(conform)或者被转换成xxx类</li>
<li>sqlite不介意错误匹配的类发生, 爆炸自己负责</li>
<li>example:</li>
</ul>
<div class="org-src-container">
<pre class="src src-sql">CREATE TABLE BIAO (name  text);
INSERT INTO BIAO value(5);
</pre>
</div>
</div>
</div>

<div id="outline-container-org2fc483c" class="outline-4">
<h4 id="org2fc483c"><span class="section-number-4">1.2.4</span> rows横排</h4>
<div class="outline-text-4" id="text-1-2-4">
<ul class="org-ul">
<li>你可以描述一横排成一个table,table在python里面是tuple</li>
</ul>
<div class="org-src-container">
<pre class="src src-sql">INSERT INTO biao VALUES (1, 'I''m a string');
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">table = (1, 'I''m a string')
</pre>
</div>
<ul class="org-ul">
<li>tuple一个值的时候,还是要留","号</li>
</ul>
<div class="org-src-container">
<pre class="src src-python">one_value = (10475030,)
</pre>
</div>
</div>
</div>

<div id="outline-container-org77a07fe" class="outline-4">
<h4 id="org77a07fe"><span class="section-number-4">1.2.5</span> Table</h4>
<div class="outline-text-4" id="text-1-2-5">
<ul class="org-ul">
<li>一个table可以通过一个python类来描述(有两部分)
<ul class="org-ul">
<li>schema <i>skime</i> (有: 表的名字, 纵列的名字, 类型)</li>
<li>row 横排</li>
</ul></li>
<li>横排不是必须唯一的, 并且横排的顺序是冇所谓的.</li>
</ul>
</div>
</div>

<div id="outline-container-org2a692d3" class="outline-4">
<h4 id="org2a692d3"><span class="section-number-4">1.2.6</span> Database</h4>
<div class="outline-text-4" id="text-1-2-6">
<ul class="org-ul">
<li>database能有多个table</li>
<li>需要table的名字来找到本体</li>
</ul>
</div>
</div>

<div id="outline-container-org66e4ce5" class="outline-4">
<h4 id="org66e4ce5"><span class="section-number-4">1.2.7</span> Project API</h4>
<div class="outline-text-4" id="text-1-2-7">
<div class="org-src-container">
<pre class="src src-python">import sqlite3
conn = sqlite3.connect("fileName.db")  #connect 会搞一个对象去操作
conn.execute("CREATE TABLE biao (name TEXT);")
conn.execute("INSERT INTO biao VALUES('Ziyan');")
rows = conn.execute("SELECT * FROM biao;") #rows竟然是一个对象! 但是能row in rows来把每一排抽取出来
for row in rows:
  print(row)
</pre>
</div>
</div>
</div>

<div id="outline-container-org2b9a60f" class="outline-4">
<h4 id="org2b9a60f"><span class="section-number-4">1.2.8</span> execute</h4>
<div class="outline-text-4" id="text-1-2-8">
<ul class="org-ul">
<li>必须都是合法sql语句.
<ul class="org-ul">
<li>空格是可以的</li>
<li>和其他
<ul class="org-ul">
<li>\n (newline)</li>
<li>\s (space)</li>
<li>\t (tab)</li>
</ul></li>
</ul></li>
</ul>
</div>
</div>

<div id="outline-container-org0487eab" class="outline-4">
<h4 id="org0487eab"><span class="section-number-4">1.2.9</span> Tokens记号</h4>
<div class="outline-text-4" id="text-1-2-9">
<div class="org-src-container">
<pre class="src src-sql">CREATE TABLE biao (name TEXT, age INTEGER);
</pre>
</div>
</div>
</div>

<div id="outline-container-org552a69e" class="outline-4">
<h4 id="org552a69e"><span class="section-number-4">1.2.10</span> Text</h4>
<div class="outline-text-4" id="text-1-2-10">
<div class="org-src-container">
<pre class="src src-python"># 字符串的单引号一定要跟住字符串, 而不是独立的item
# 最后一项都是分号;
rightList = ["INSERT", "INTO", "myTable", "VALUES", "(", "'My name'", ")", ";"]
wrongList = ["INSERT", "INTO", "myTable", "VALUES", "(", "'", "My", "name", "'", ")", ";"]
</pre>
</div>
</div>
</div>

<div id="outline-container-org28b9da7" class="outline-4">
<h4 id="org28b9da7"><span class="section-number-4">1.2.11</span> Store database</h4>
<div class="outline-text-4" id="text-1-2-11">
<ul class="org-ul">
<li>I recommend <b>while</b>   we   are only making <b>transient</b> [ <i>'trænziәnt</i> ] database.</li>
<li>我 建议     <b>到时候</b>  我们 只 会    搞     <b>瞬间变化的</b>             数据库</li>
</ul>
</div>
</div>
</div>

<div id="outline-container-org13de976" class="outline-3">
<h3 id="org13de976"><span class="section-number-3">1.3</span> 时间</h3>
<div class="outline-text-3" id="text-1-3">
<ol class="org-ol">
<li>Week03<sub>Python</sub><sub>Database</sub><sub>More.pptx</sub> 40min</li>
<li>test 40min</li>
</ol>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: Ava1oN</p>
<p class="date">Created: 2017-02-19 Sun 05:30</p>
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>
</html>