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<h1 id="zippondata">ZipponData</h1>
<p>ZipponData is a library developped in the context of <a href="https://github.com/MrBounty/ZipponDB/tree/v0.1.3">ZipponDB</a>.</p>
<p>The library intent to create a simple way to store and parse data from a file in the most efficient and fast way possible. </p>
<p>There is 6 data type available in ZipponData:</p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Zig type</th>
<th>Bytes in file</th>
</tr>
</thead>
<tbody>
<tr>
<td>int</td>
<td>i32</td>
<td>4</td>
</tr>
<tr>
<td>float</td>
<td>f64</td>
<td>8</td>
</tr>
<tr>
<td>bool</td>
<td>bool</td>
<td>1</td>
</tr>
<tr>
<td>str</td>
<td>[]u8</td>
<td>4 + len</td>
</tr>
<tr>
<td>uuid</td>
<td>[16]u8</td>
<td>16</td>
</tr>
<tr>
<td>unix</td>
<td>u64</td>
<td>8</td>
</tr>
</tbody>
</table>
<p>Each type have its array equivalent.</p>
<h2 id="quickstart">Quickstart</h2>
<ol>
<li>Create a file with <code>createFile</code></li>
<li>Create some <code>Data</code></li>
<li>Create a <code>DataWriter</code></li>
<li>Write the data</li>
<li>Create a schema</li>
<li>Create an iterator with <code>DataIterator</code></li>
<li>Iterate over all value</li>
<li>Delete the file with <code>deleteFile</code></li>
</ol>
<p>Here an example of how to use it:
<div class="language-zig highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kr">const</span><span class="w"> </span><span class="n">std</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">@import</span><span class="p">(</span><span class="s">&quot;std&quot;</span><span class="p">);</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kr">pub</span><span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="n">main</span><span class="p">()</span><span class="w"> </span><span class="o">!</span><span class="kt">void</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">allocator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">testing</span><span class="p">.</span><span class="n">allocator</span><span class="p">;</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="c1">// 0. Make a temporary directory</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">fs</span><span class="p">.</span><span class="n">cwd</span><span class="p">().</span><span class="n">makeDir</span><span class="p">(</span><span class="s">&quot;tmp&quot;</span><span class="p">);</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">dir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">fs</span><span class="p">.</span><span class="n">cwd</span><span class="p">().</span><span class="n">openDir</span><span class="p">(</span><span class="s">&quot;tmp&quot;</span><span class="p">,</span><span class="w"> </span><span class="p">.{});</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="c1">// 1. Create a file</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">createFile</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">);</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="c1">// 2. Create some Data</span>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">data</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="n">_</span><span class="p">]</span><span class="n">Data</span><span class="p">{</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initInt</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initFloat</span><span class="p">(</span><span class="mf">3.14159</span><span class="p">),</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initInt</span><span class="p">(</span><span class="o">-</span><span class="mi">5</span><span class="p">),</span>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initStr</span><span class="p">(</span><span class="s">&quot;Hello world&quot;</span><span class="p">),</span>
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initBool</span><span class="p">(</span><span class="kc">true</span><span class="p">),</span>
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initUnix</span><span class="p">(</span><span class="mi">2021</span><span class="p">),</span>
</span><span id="__span-0-21"><a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="p">};</span>
</span><span id="__span-0-22"><a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a>
</span><span id="__span-0-23"><a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="c1">// 3. Create a DataWriter</span>
</span><span id="__span-0-24"><a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="w"> </span><span class="kr">var</span><span class="w"> </span><span class="n">dwriter</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">DataWriter</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">);</span>
</span><span id="__span-0-25"><a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="k">defer</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">deinit</span><span class="p">();</span><span class="w"> </span><span class="c1">// This just close the file</span>
</span><span id="__span-0-26"><a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a>
</span><span id="__span-0-27"><a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="w"> </span><span class="c1">// 4. Write some data</span>
</span><span id="__span-0-28"><a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">);</span>
</span><span id="__span-0-29"><a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">);</span>
</span><span id="__span-0-30"><a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">);</span>
</span><span id="__span-0-31"><a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">);</span>
</span><span id="__span-0-32"><a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">);</span>
</span><span id="__span-0-33"><a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">);</span>
</span><span id="__span-0-34"><a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">flush</span><span class="p">();</span><span class="w"> </span><span class="c1">// Dont forget to flush !</span>
</span><span id="__span-0-35"><a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a>
</span><span id="__span-0-36"><a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="w"> </span><span class="c1">// 5. Create a schema</span>
</span><span id="__span-0-37"><a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a><span class="w"> </span><span class="c1">// A schema is how the iterator will parse the file. </span>
</span><span id="__span-0-38"><a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="c1">// If you are wrong here, it will return wrong/random data</span>
</span><span id="__span-0-39"><a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a><span class="w"> </span><span class="c1">// And most likely an error when iterating in the while loop</span>
</span><span id="__span-0-40"><a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">schema</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&amp;</span><span class="p">[</span><span class="n">_</span><span class="p">]</span><span class="n">DType</span><span class="p">{</span>
</span><span id="__span-0-41"><a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a><span class="w"> </span><span class="p">.</span><span class="n">Int</span><span class="p">,</span>
</span><span id="__span-0-42"><a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a><span class="w"> </span><span class="p">.</span><span class="n">Float</span><span class="p">,</span>
</span><span id="__span-0-43"><a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a><span class="w"> </span><span class="p">.</span><span class="n">Int</span><span class="p">,</span>
</span><span id="__span-0-44"><a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a><span class="w"> </span><span class="p">.</span><span class="n">Str</span><span class="p">,</span>
</span><span id="__span-0-45"><a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a><span class="w"> </span><span class="p">.</span><span class="n">Bool</span><span class="p">,</span>
</span><span id="__span-0-46"><a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="w"> </span><span class="p">.</span><span class="n">Unix</span><span class="p">,</span>
</span><span id="__span-0-47"><a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a><span class="w"> </span><span class="p">};</span>
</span><span id="__span-0-48"><a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a>
</span><span id="__span-0-49"><a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a><span class="w"> </span><span class="c1">// 6. Create a DataIterator</span>
</span><span id="__span-0-50"><a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a><span class="w"> </span><span class="kr">var</span><span class="w"> </span><span class="n">iter</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">DataIterator</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="n">allocator</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">,</span><span class="w"> </span><span class="n">schema</span><span class="p">);</span>
</span><span id="__span-0-51"><a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a><span class="w"> </span><span class="k">defer</span><span class="w"> </span><span class="n">iter</span><span class="p">.</span><span class="n">deinit</span><span class="p">();</span>
</span><span id="__span-0-52"><a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a>
</span><span id="__span-0-53"><a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a><span class="w"> </span><span class="c1">// 7. Iterate over data</span>
</span><span id="__span-0-54"><a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a><span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="k">try</span><span class="w"> </span><span class="n">iter</span><span class="p">.</span><span class="n">next</span><span class="p">())</span><span class="w"> </span><span class="o">|</span><span class="n">row</span><span class="o">|</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-55"><a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">debug</span><span class="p">.</span><span class="n">print</span><span class="p">(</span><span class="s">&quot;Row: {any}</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span><span class="w"> </span><span class="p">.{</span><span class="w"> </span><span class="n">row</span><span class="w"> </span><span class="p">});</span>
</span><span id="__span-0-56"><a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-0-57"><a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a>
</span><span id="__span-0-58"><a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a><span class="w"> </span><span class="c1">// 8. Delete the file (Optional ofc)</span>
</span><span id="__span-0-59"><a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">deleteFile</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">);</span>
</span><span id="__span-0-60"><a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">fs</span><span class="p">.</span><span class="n">cwd</span><span class="p">().</span><span class="n">deleteDir</span><span class="p">(</span><span class="s">&quot;tmp&quot;</span><span class="p">);</span>
</span><span id="__span-0-61"><a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a><span class="p">}</span>
</span></code></pre></div></p>
<p><strong><em>Note: The dir can be null and it will use cwd.</em></strong></p>
<h2 id="array">Array</h2>
<p>All data type have an array equivalent. To write an array, you need to first encode it using <code>allocEncodArray</code> before writing it.
This use an allocator so you need to free what it return.</p>
<p>When read, an array is just the raw bytes. To get the data itself, you need to create an <code>ArrayIterator</code>. Here an example:</p>
<div class="language-zig highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kr">pub</span><span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="n">main</span><span class="p">()</span><span class="w"> </span><span class="o">!</span><span class="kt">void</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">allocator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">testing</span><span class="p">.</span><span class="n">allocator</span><span class="p">;</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="c1">// 0. Make a temporary directory</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">fs</span><span class="p">.</span><span class="n">cwd</span><span class="p">().</span><span class="n">makeDir</span><span class="p">(</span><span class="s">&quot;array_tmp&quot;</span><span class="p">);</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">dir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">fs</span><span class="p">.</span><span class="n">cwd</span><span class="p">().</span><span class="n">openDir</span><span class="p">(</span><span class="s">&quot;array_tmp&quot;</span><span class="p">,</span><span class="w"> </span><span class="p">.{});</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="w"> </span><span class="c1">// 1. Create a file</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">createFile</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">);</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="w"> </span><span class="c1">// 2. Create and encode some Data</span>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">int_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="kt">i32</span><span class="p">{</span><span class="w"> </span><span class="mi">32</span><span class="p">,</span><span class="w"> </span><span class="mi">11</span><span class="p">,</span><span class="w"> </span><span class="mi">15</span><span class="p">,</span><span class="w"> </span><span class="mi">99</span><span class="w"> </span><span class="p">};</span>
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">data</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="n">_</span><span class="p">]</span><span class="n">Data</span><span class="p">{</span>
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initIntArray</span><span class="p">(</span><span class="k">try</span><span class="w"> </span><span class="n">allocEncodArray</span><span class="p">.</span><span class="n">Int</span><span class="p">(</span><span class="n">allocator</span><span class="p">,</span><span class="w"> </span><span class="o">&amp;</span><span class="n">int_array</span><span class="p">)),</span><span class="w"> </span><span class="c1">// Encode</span>
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="w"> </span><span class="p">};</span>
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w"> </span><span class="k">defer</span><span class="w"> </span><span class="n">allocator</span><span class="p">.</span><span class="n">free</span><span class="p">(</span><span class="n">data</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="n">IntArray</span><span class="p">);</span><span class="w"> </span><span class="c1">// DOnt forget to free it</span>
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a>
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="w"> </span><span class="c1">// 3. Create a DataWriter</span>
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="w"> </span><span class="kr">var</span><span class="w"> </span><span class="n">dwriter</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">DataWriter</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">);</span>
</span><span id="__span-1-20"><a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="w"> </span><span class="k">defer</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">deinit</span><span class="p">();</span>
</span><span id="__span-1-21"><a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a>
</span><span id="__span-1-22"><a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a><span class="w"> </span><span class="c1">// 4. Write some data</span>
</span><span id="__span-1-23"><a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">);</span>
</span><span id="__span-1-24"><a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">dwriter</span><span class="p">.</span><span class="n">flush</span><span class="p">();</span>
</span><span id="__span-1-25"><a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a>
</span><span id="__span-1-26"><a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a><span class="w"> </span><span class="c1">// 5. Create a schema</span>
</span><span id="__span-1-27"><a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a><span class="w"> </span><span class="kr">const</span><span class="w"> </span><span class="n">schema</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&amp;</span><span class="p">[</span><span class="n">_</span><span class="p">]</span><span class="n">DType</span><span class="p">{</span>
</span><span id="__span-1-28"><a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a><span class="w"> </span><span class="p">.</span><span class="n">IntArray</span><span class="p">,</span>
</span><span id="__span-1-29"><a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a><span class="w"> </span><span class="p">};</span>
</span><span id="__span-1-30"><a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a>
</span><span id="__span-1-31"><a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a><span class="w"> </span><span class="c1">// 6. Create a DataIterator</span>
</span><span id="__span-1-32"><a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a><span class="w"> </span><span class="kr">var</span><span class="w"> </span><span class="n">iter</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">DataIterator</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="n">allocator</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">,</span><span class="w"> </span><span class="n">schema</span><span class="p">);</span>
</span><span id="__span-1-33"><a id="__codelineno-1-33" name="__codelineno-1-33" href="#__codelineno-1-33"></a><span class="w"> </span><span class="k">defer</span><span class="w"> </span><span class="n">iter</span><span class="p">.</span><span class="n">deinit</span><span class="p">();</span>
</span><span id="__span-1-34"><a id="__codelineno-1-34" name="__codelineno-1-34" href="#__codelineno-1-34"></a>
</span><span id="__span-1-35"><a id="__codelineno-1-35" name="__codelineno-1-35" href="#__codelineno-1-35"></a><span class="w"> </span><span class="c1">// 7. Iterate over data</span>
</span><span id="__span-1-36"><a id="__codelineno-1-36" name="__codelineno-1-36" href="#__codelineno-1-36"></a><span class="w"> </span><span class="kr">var</span><span class="w"> </span><span class="n">i</span><span class="o">:</span><span class="w"> </span><span class="kt">usize</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
</span><span id="__span-1-37"><a id="__codelineno-1-37" name="__codelineno-1-37" href="#__codelineno-1-37"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="k">try</span><span class="w"> </span><span class="n">iter</span><span class="p">.</span><span class="n">next</span><span class="p">())</span><span class="w"> </span><span class="o">|</span><span class="n">row</span><span class="o">|</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-38"><a id="__codelineno-1-38" name="__codelineno-1-38" href="#__codelineno-1-38"></a>
</span><span id="__span-1-39"><a id="__codelineno-1-39" name="__codelineno-1-39" href="#__codelineno-1-39"></a><span class="w"> </span><span class="c1">// 8. Iterate over array</span>
</span><span id="__span-1-40"><a id="__codelineno-1-40" name="__codelineno-1-40" href="#__codelineno-1-40"></a><span class="w"> </span><span class="kr">var</span><span class="w"> </span><span class="n">array_iter</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ArrayIterator</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="o">&amp;</span><span class="n">row</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span><span class="w"> </span><span class="c1">// Sub array iterator</span>
</span><span id="__span-1-41"><a id="__codelineno-1-41" name="__codelineno-1-41" href="#__codelineno-1-41"></a><span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">array_iter</span><span class="p">.</span><span class="n">next</span><span class="p">())</span><span class="w"> </span><span class="o">|</span><span class="n">d</span><span class="o">|</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-42"><a id="__codelineno-1-42" name="__codelineno-1-42" href="#__codelineno-1-42"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">testing</span><span class="p">.</span><span class="n">expectEqual</span><span class="p">(</span><span class="n">int_array</span><span class="p">[</span><span class="n">i</span><span class="p">],</span><span class="w"> </span><span class="n">d</span><span class="p">.</span><span class="n">Int</span><span class="p">);</span>
</span><span id="__span-1-43"><a id="__codelineno-1-43" name="__codelineno-1-43" href="#__codelineno-1-43"></a><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
</span><span id="__span-1-44"><a id="__codelineno-1-44" name="__codelineno-1-44" href="#__codelineno-1-44"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-1-45"><a id="__codelineno-1-45" name="__codelineno-1-45" href="#__codelineno-1-45"></a>
</span><span id="__span-1-46"><a id="__codelineno-1-46" name="__codelineno-1-46" href="#__codelineno-1-46"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-1-47"><a id="__codelineno-1-47" name="__codelineno-1-47" href="#__codelineno-1-47"></a>
</span><span id="__span-1-48"><a id="__codelineno-1-48" name="__codelineno-1-48" href="#__codelineno-1-48"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">deleteFile</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">dir</span><span class="p">);</span>
</span><span id="__span-1-49"><a id="__codelineno-1-49" name="__codelineno-1-49" href="#__codelineno-1-49"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="n">std</span><span class="p">.</span><span class="n">fs</span><span class="p">.</span><span class="n">cwd</span><span class="p">().</span><span class="n">deleteDir</span><span class="p">(</span><span class="s">&quot;array_tmp&quot;</span><span class="p">);</span>
</span><span id="__span-1-50"><a id="__codelineno-1-50" name="__codelineno-1-50" href="#__codelineno-1-50"></a><span class="p">}</span><span class="w"> </span>
</span></code></pre></div>
<h2 id="benchmark">Benchmark</h2>
<p>Done on a AMD Ryzen 7 7800X3D with a Samsung SSD 980 PRO 2TB (up to 7,000/5,100MB/s for read/write speed) on one thread.</p>
<p>Data use:
<div class="language-zig highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kr">const</span><span class="w"> </span><span class="n">schema</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&amp;</span><span class="p">[</span><span class="n">_</span><span class="p">]</span><span class="n">DType</span><span class="p">{</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span><span class="p">.</span><span class="n">Int</span><span class="p">,</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="p">.</span><span class="n">Float</span><span class="p">,</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="p">.</span><span class="n">Int</span><span class="p">,</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="p">.</span><span class="n">Str</span><span class="p">,</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="p">.</span><span class="n">Bool</span><span class="p">,</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="p">.</span><span class="n">Unix</span><span class="p">,</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="p">};</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="kr">const</span><span class="w"> </span><span class="n">data</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&amp;</span><span class="p">[</span><span class="n">_</span><span class="p">]</span><span class="n">Data</span><span class="p">{</span>
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initInt</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span>
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initFloat</span><span class="p">(</span><span class="mf">3.14159</span><span class="p">),</span>
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initInt</span><span class="p">(</span><span class="o">-</span><span class="mi">5</span><span class="p">),</span>
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initStr</span><span class="p">(</span><span class="s">&quot;Hello world&quot;</span><span class="p">),</span>
</span><span id="__span-2-15"><a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initBool</span><span class="p">(</span><span class="kc">true</span><span class="p">),</span>
</span><span id="__span-2-16"><a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="w"> </span><span class="n">Data</span><span class="p">.</span><span class="n">initUnix</span><span class="p">(</span><span class="mi">2021</span><span class="p">),</span>
</span><span id="__span-2-17"><a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a><span class="p">};</span>
</span></code></pre></div></p>
<p>Result:</p>
<table>
<thead>
<tr>
<th>Number of Entity</th>
<th>Total Write Time (ms)</th>
<th>Average Write Time / entity (μs)</th>
<th>Total Read Time (ms)</th>
<th>Average Read Time / entity (μs)</th>
<th>File Size (kB)</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>0.01</td>
<td>13.63</td>
<td>0.025</td>
<td>25.0</td>
<td>0.04</td>
</tr>
<tr>
<td>10</td>
<td>0.01</td>
<td>1.69</td>
<td>0.03</td>
<td>3.28</td>
<td>0.4</td>
</tr>
<tr>
<td>100</td>
<td>0.04</td>
<td>0.49</td>
<td>0.07</td>
<td>0.67</td>
<td>4.0</td>
</tr>
<tr>
<td>1_000</td>
<td>0.36</td>
<td>0.36</td>
<td>0.48</td>
<td>0.48</td>
<td>40</td>
</tr>
<tr>
<td>10_000</td>
<td>3.42</td>
<td>0.34</td>
<td>4.67</td>
<td>0.47</td>
<td>400</td>
</tr>
<tr>
<td>100_000</td>
<td>36.39</td>
<td>0.36</td>
<td>48.00</td>
<td>0.49</td>
<td>4_000</td>
</tr>
<tr>
<td>1_000_000</td>
<td>361.41</td>
<td>0.36</td>
<td>481.00</td>
<td>0.48</td>
<td>40_000</td>
</tr>
</tbody>
</table>
<p><strong><em>Note: You can check <a href="/ZipponDB/Benchmark">benchmark</a> to see performance of the real database using multi-threading. Was able to parse 1_000_000 users in less than 100ms</em></strong></p>
</article>
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