mirror of
https://gitea.invidious.io/iv-org/shard-crystal-db.git
synced 2024-08-15 00:53:32 +00:00
574 lines
17 KiB
HTML
574 lines
17 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="utf-8" />
|
|
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
<meta name="generator" content="Crystal Docs 1.5.1">
|
|
<meta name="crystal_docs.project_version" content="0.13.1">
|
|
<meta name="crystal_docs.project_name" content="db">
|
|
|
|
|
|
|
|
<link href="css/style.css" rel="stylesheet" type="text/css" />
|
|
<script type="text/javascript" src="js/doc.js"></script>
|
|
|
|
<meta name="repository-name" content="db">
|
|
<title>Enum - db 0.13.1</title>
|
|
<script type="text/javascript">
|
|
CrystalDocs.base_path = "";
|
|
</script>
|
|
</head>
|
|
<body>
|
|
|
|
<svg class="hidden">
|
|
<symbol id="octicon-link" viewBox="0 0 16 16">
|
|
<path fill="currentColor" fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path>
|
|
</symbol>
|
|
</svg>
|
|
<input type="checkbox" id="sidebar-btn">
|
|
<label for="sidebar-btn" id="sidebar-btn-label">
|
|
<svg class="open" xmlns="http://www.w3.org/2000/svg" height="2em" width="2em" viewBox="0 0 512 512"><title>Open Sidebar</title><path fill="currentColor" d="M80 96v64h352V96H80zm0 112v64h352v-64H80zm0 112v64h352v-64H80z"></path></svg>
|
|
<svg class="close" xmlns="http://www.w3.org/2000/svg" width="2em" height="2em" viewBox="0 0 512 512"><title>Close Sidebar</title><path fill="currentColor" d="m118.6 73.4-45.2 45.2L210.7 256 73.4 393.4l45.2 45.2L256 301.3l137.4 137.3 45.2-45.2L301.3 256l137.3-137.4-45.2-45.2L256 210.7Z"></path></svg>
|
|
</label>
|
|
<div class="sidebar">
|
|
<div class="sidebar-header">
|
|
<div class="search-box">
|
|
<input type="search" class="search-input" placeholder="Search..." spellcheck="false" aria-label="Search">
|
|
</div>
|
|
|
|
<div class="project-summary">
|
|
<h1 class="project-name">
|
|
<a href="index.html">
|
|
db
|
|
</a>
|
|
</h1>
|
|
|
|
<span class="project-version">
|
|
0.13.1
|
|
</span>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="search-results hidden">
|
|
<ul class="search-list"></ul>
|
|
</div>
|
|
|
|
<div class="types-list">
|
|
<ul>
|
|
|
|
<li class="parent " data-id="db/DB" data-name="db">
|
|
<a href="DB.html">DB</a>
|
|
|
|
<ul>
|
|
|
|
<li class=" " data-id="db/DB/Any" data-name="db::any">
|
|
<a href="DB/Any.html">Any</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/BeginTransaction" data-name="db::begintransaction">
|
|
<a href="DB/BeginTransaction.html">BeginTransaction</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/ColumnTypeMismatchError" data-name="db::columntypemismatcherror">
|
|
<a href="DB/ColumnTypeMismatchError.html">ColumnTypeMismatchError</a>
|
|
|
|
</li>
|
|
|
|
<li class="parent " data-id="db/DB/Connection" data-name="db::connection">
|
|
<a href="DB/Connection.html">Connection</a>
|
|
|
|
<ul>
|
|
|
|
<li class=" " data-id="db/DB/Connection/Options" data-name="db::connection::options">
|
|
<a href="DB/Connection/Options.html">Options</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/ConnectionBuilder" data-name="db::connectionbuilder">
|
|
<a href="DB/ConnectionBuilder.html">ConnectionBuilder</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/ConnectionContext" data-name="db::connectioncontext">
|
|
<a href="DB/ConnectionContext.html">ConnectionContext</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/ConnectionLost" data-name="db::connectionlost">
|
|
<a href="DB/ConnectionLost.html">ConnectionLost</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/ConnectionRefused" data-name="db::connectionrefused">
|
|
<a href="DB/ConnectionRefused.html">ConnectionRefused</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Database" data-name="db::database">
|
|
<a href="DB/Database.html">Database</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Disposable" data-name="db::disposable">
|
|
<a href="DB/Disposable.html">Disposable</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Driver" data-name="db::driver">
|
|
<a href="DB/Driver.html">Driver</a>
|
|
|
|
</li>
|
|
|
|
<li class="parent " data-id="db/DB/DriverSpecs" data-name="db::driverspecs(dbanytype)">
|
|
<a href="DB/DriverSpecs.html">DriverSpecs</a>
|
|
|
|
<ul>
|
|
|
|
<li class=" " data-id="db/DB/DriverSpecs/ColumnDef" data-name="db::driverspecs::columndef">
|
|
<a href="DB/DriverSpecs/ColumnDef.html">ColumnDef</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Error" data-name="db::error">
|
|
<a href="DB/Error.html">Error</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/ExecResult" data-name="db::execresult">
|
|
<a href="DB/ExecResult.html">ExecResult</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Field" data-name="db::field">
|
|
<a href="DB/Field.html">Field</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Mappable" data-name="db::mappable">
|
|
<a href="DB/Mappable.html">Mappable</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/MappingException" data-name="db::mappingexception">
|
|
<a href="DB/MappingException.html">MappingException</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/MetadataValueConverter" data-name="db::metadatavalueconverter">
|
|
<a href="DB/MetadataValueConverter.html">MetadataValueConverter</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/NoResultsError" data-name="db::noresultserror">
|
|
<a href="DB/NoResultsError.html">NoResultsError</a>
|
|
|
|
</li>
|
|
|
|
<li class="parent " data-id="db/DB/Pool" data-name="db::pool(t)">
|
|
<a href="DB/Pool.html">Pool</a>
|
|
|
|
<ul>
|
|
|
|
<li class=" " data-id="db/DB/Pool/Options" data-name="db::pool::options">
|
|
<a href="DB/Pool/Options.html">Options</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Pool/Stats" data-name="db::pool::stats">
|
|
<a href="DB/Pool/Stats.html">Stats</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/PoolPreparedStatement" data-name="db::poolpreparedstatement">
|
|
<a href="DB/PoolPreparedStatement.html">PoolPreparedStatement</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/PoolResourceLost" data-name="db::poolresourcelost(t)">
|
|
<a href="DB/PoolResourceLost.html">PoolResourceLost</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/PoolResourceRefused" data-name="db::poolresourcerefused">
|
|
<a href="DB/PoolResourceRefused.html">PoolResourceRefused</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/PoolRetryAttemptsExceeded" data-name="db::poolretryattemptsexceeded">
|
|
<a href="DB/PoolRetryAttemptsExceeded.html">PoolRetryAttemptsExceeded</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/PoolStatement" data-name="db::poolstatement">
|
|
<a href="DB/PoolStatement.html">PoolStatement</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/PoolTimeout" data-name="db::pooltimeout">
|
|
<a href="DB/PoolTimeout.html">PoolTimeout</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/PoolUnpreparedStatement" data-name="db::poolunpreparedstatement">
|
|
<a href="DB/PoolUnpreparedStatement.html">PoolUnpreparedStatement</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/QueryMethods" data-name="db::querymethods(stmt)">
|
|
<a href="DB/QueryMethods.html">QueryMethods</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/ResultSet" data-name="db::resultset">
|
|
<a href="DB/ResultSet.html">ResultSet</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Rollback" data-name="db::rollback">
|
|
<a href="DB/Rollback.html">Rollback</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/SavePointTransaction" data-name="db::savepointtransaction">
|
|
<a href="DB/SavePointTransaction.html">SavePointTransaction</a>
|
|
|
|
</li>
|
|
|
|
<li class="parent " data-id="db/DB/Serializable" data-name="db::serializable">
|
|
<a href="DB/Serializable.html">Serializable</a>
|
|
|
|
<ul>
|
|
|
|
<li class=" " data-id="db/DB/Serializable/NonStrict" data-name="db::serializable::nonstrict">
|
|
<a href="DB/Serializable/NonStrict.html">NonStrict</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="parent " data-id="db/DB/SessionMethods" data-name="db::sessionmethods(session, stmt)">
|
|
<a href="DB/SessionMethods.html">SessionMethods</a>
|
|
|
|
<ul>
|
|
|
|
<li class=" " data-id="db/DB/SessionMethods/PreparedQuery" data-name="db::sessionmethods::preparedquery(session, stmt)">
|
|
<a href="DB/SessionMethods/PreparedQuery.html">PreparedQuery</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/SessionMethods/UnpreparedQuery" data-name="db::sessionmethods::unpreparedquery(session, stmt)">
|
|
<a href="DB/SessionMethods/UnpreparedQuery.html">UnpreparedQuery</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Statement" data-name="db::statement">
|
|
<a href="DB/Statement.html">Statement</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/StatementMethods" data-name="db::statementmethods">
|
|
<a href="DB/StatementMethods.html">StatementMethods</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/StringKeyCache" data-name="db::stringkeycache(t)">
|
|
<a href="DB/StringKeyCache.html">StringKeyCache</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/TopLevelTransaction" data-name="db::topleveltransaction">
|
|
<a href="DB/TopLevelTransaction.html">TopLevelTransaction</a>
|
|
|
|
</li>
|
|
|
|
<li class=" " data-id="db/DB/Transaction" data-name="db::transaction">
|
|
<a href="DB/Transaction.html">Transaction</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
</li>
|
|
|
|
<li class=" current" data-id="db/Enum" data-name="enum">
|
|
<a href="Enum.html">Enum</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<div class="main-content">
|
|
<h1 class="type-name">
|
|
|
|
<span class="kind">abstract struct</span> Enum
|
|
|
|
</h1>
|
|
|
|
|
|
<ul class="superclass-hierarchy"><li class="superclass"><a href="Enum.html">Enum</a></li><li class="superclass">Value</li><li class="superclass">Object</li></ul>
|
|
|
|
|
|
|
|
|
|
<h2>
|
|
<a id="overview" class="anchor" href="#overview">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>
|
|
Overview
|
|
</h2>
|
|
|
|
<p>Enum is the base type of all enums.</p>
|
|
<p>An enum is a set of integer values, where each value has an associated name. For example:</p>
|
|
<pre><code class="language-crystal"><span class="k">enum</span> <span class="t">Color</span>
|
|
<span class="t">Red</span> <span class="c"># 0</span>
|
|
<span class="t">Green</span> <span class="c"># 1</span>
|
|
<span class="t">Blue</span> <span class="c"># 2</span>
|
|
<span class="k">end</span></code></pre>
|
|
<p>Values start with the value <code>0</code> and are incremented by one, but can be overwritten.</p>
|
|
<p>To get the underlying value you invoke value on it:</p>
|
|
<pre><code class="language-crystal"><span class="t">Color</span><span class="t">::</span><span class="t">Green</span>.value <span class="c"># => 1</span></code></pre>
|
|
<p>Each constant (member) in the enum has the type of the enum:</p>
|
|
<pre><code class="language-crystal"><span class="k">typeof</span>(<span class="t">Color</span><span class="t">::</span><span class="t">Red</span>) <span class="c"># => Color</span></code></pre>
|
|
<h3><a id="flags-enum" class="anchor" href="#flags-enum">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>Flags enum</h3>
|
|
<p>An enum can be marked with the <code>@[Flags]</code> annotation. This changes the default values:</p>
|
|
<pre><code class="language-crystal">@[<span class="t">Flags</span>]
|
|
<span class="k">enum</span> <span class="t">IOMode</span>
|
|
<span class="t">Read</span> <span class="c"># 1</span>
|
|
<span class="t">Write</span> <span class="c"># 2</span>
|
|
<span class="t">Async</span> <span class="c"># 4</span>
|
|
<span class="k">end</span></code></pre>
|
|
<p>Additionally, some methods change their behaviour.</p>
|
|
<h3><a id="enums-from-integers" class="anchor" href="#enums-from-integers">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>Enums from integers</h3>
|
|
<p>An enum can be created from an integer:</p>
|
|
<pre><code class="language-crystal"><span class="t">Color</span>.new(<span class="n">1</span>).to_s <span class="c"># => "Green"</span></code></pre>
|
|
<p>Values that don't correspond to enum's constants are allowed: the value
|
|
will still be of type Color, but when printed you will get the underlying value:</p>
|
|
<pre><code class="language-crystal"><span class="t">Color</span>.new(<span class="n">10</span>).to_s <span class="c"># => "10"</span></code></pre>
|
|
<p>This method is mainly intended to convert integers from C to enums in Crystal.</p>
|
|
<h3><a id="question-methods" class="anchor" href="#question-methods">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>Question methods</h3>
|
|
<p>An enum automatically defines question methods for each member, using
|
|
<code>String#underscore</code> for the method name.</p>
|
|
<ul>
|
|
<li>In the case of regular enums, this compares by equality (<code>==</code>).</li>
|
|
<li>In the case of flags enums, this invokes <code>includes?</code>.</li>
|
|
</ul>
|
|
<p>For example:</p>
|
|
<pre><code class="language-crystal">color <span class="o">=</span> <span class="t">Color</span><span class="t">::</span><span class="t">Blue</span>
|
|
color.red? <span class="c"># => false</span>
|
|
color.blue? <span class="c"># => true</span>
|
|
|
|
mode <span class="o">=</span> <span class="t">IOMode</span><span class="t">::</span><span class="t">Read</span> <span class="o">|</span> <span class="t">IOMode</span><span class="t">::</span><span class="t">Async</span>
|
|
mode.read? <span class="c"># => true</span>
|
|
mode.write? <span class="c"># => false</span>
|
|
mode.async? <span class="c"># => true</span></code></pre>
|
|
<p>This is very convenient in <code>case</code> expressions:</p>
|
|
<pre><code class="language-crystal"><span class="k">case</span> color
|
|
<span class="k">when</span> .red?
|
|
puts <span class="s">"Got red"</span>
|
|
<span class="k">when</span> .blue?
|
|
puts <span class="s">"Got blue"</span>
|
|
<span class="k">end</span></code></pre>
|
|
<h3><a id="changing-the-base-type" class="anchor" href="#changing-the-base-type">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>Changing the Base Type</h3>
|
|
<p>The type of the underlying enum value is <code>Int32</code> by default, but it can be changed to any type in <code>Int::Primitive</code>.</p>
|
|
<pre><code class="language-crystal"><span class="k">enum</span> <span class="t">Color</span> : <span class="t">UInt8</span>
|
|
<span class="t">Red</span>
|
|
<span class="t">Green</span>
|
|
<span class="t">Blue</span>
|
|
<span class="k">end</span>
|
|
|
|
<span class="t">Color</span><span class="t">::</span><span class="t">Red</span>.value <span class="c"># : UInt8</span></code></pre>
|
|
|
|
|
|
|
|
|
|
|
|
<h2>
|
|
<a id="included-modules" class="anchor" href="#included-modules">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>
|
|
Included Modules
|
|
</h2>
|
|
<ul class="other-types-list">
|
|
|
|
<li class="other-type">Comparable(<a href="Enum.html">Enum</a>)</li>
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h2>
|
|
<a id="defined-in" class="anchor" href="#defined-in">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>
|
|
Defined in:
|
|
</h2>
|
|
|
|
|
|
<a href="https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/result_set.cr#L156" target="_blank">
|
|
db/result_set.cr
|
|
</a>
|
|
|
|
<br/>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h2>
|
|
<a id="constructors" class="anchor" href="#constructors">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>
|
|
Constructors
|
|
</h2>
|
|
<ul class="list-summary">
|
|
|
|
<li class="entry-summary">
|
|
<a href="#new%28rs%3ADB%3A%3AResultSet%29%3Aself-class-method" class="signature"><strong>.new</strong>(rs : DB::ResultSet) : <span class="k">self</span></a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="methods-inherited">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
<h2>
|
|
<a id="constructor-detail" class="anchor" href="#constructor-detail">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>
|
|
Constructor Detail
|
|
</h2>
|
|
|
|
<div class="entry-detail" id="new(rs:DB::ResultSet):self-class-method">
|
|
<div class="signature">
|
|
|
|
def self.<strong>new</strong>(rs : <a href="DB/ResultSet.html">DB::ResultSet</a>) : <span class="k">self</span>
|
|
|
|
<a class="method-permalink" href="#new%28rs%3ADB%3A%3AResultSet%29%3Aself-class-method">#</a>
|
|
</div>
|
|
|
|
<br/>
|
|
<div>
|
|
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/result_set.cr#L157" target="_blank">View source</a>]
|
|
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
</body>
|
|
</html>
|