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<h1 class="title">src/fiber_orm/pool</h1>
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<li>
<a class="reference reference-toplevel" href="#7" id="57">Types</a>
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<li><a class="reference" href="#DbConnPool"
title="DbConnPool = ref object
conns: seq[PooledDbConn]
cfg: DbConnPoolConfig
lastId: int">DbConnPool</a></li>
<li><a class="reference" href="#DbConnPoolConfig"
title="DbConnPoolConfig = object
connect*: () -> DbConn ## Factory procedure to create a new DBConn
poolSize*: int ## The pool capacity.
hardCap*: bool ## Is the pool capacity a hard cap?
##
## When `false`, the pool can grow beyond the configured
## capacity, but will release connections down to the its
## capacity (no less than `poolSize`).
##
## When `true` the pool will not create more than its
## configured capacity. It a connection is requested, none
## are free, and the pool is at capacity, this will result
## in an Error being raised.
healthCheckQuery*: string ## Should be a simple and fast SQL query that the
## pool can use to test the liveliness of pooled
## connections.">DbConnPoolConfig</a></li>
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<a class="reference reference-toplevel" href="#12" id="62">Procs</a>
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<ul class="simple nested-toc-section">initDbConnPool
<li><a class="reference" href="#initDbConnPool%2CDbConnPoolConfig"
title="initDbConnPool(cfg: DbConnPoolConfig): DbConnPool">initDbConnPool(cfg: DbConnPoolConfig): DbConnPool</a></li>
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<ul class="simple nested-toc-section">release
<li><a class="reference" href="#release%2CDbConnPool%2Cint"
title="release(pool: DbConnPool; connId: int): void">release(pool: DbConnPool; connId: int): void</a></li>
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<ul class="simple nested-toc-section">take
<li><a class="reference" href="#take%2CDbConnPool"
title="take(pool: DbConnPool): tuple[id: int, conn: DbConn]">take(pool: DbConnPool): tuple[id: int, conn: DbConn]</a></li>
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<a class="reference reference-toplevel" href="#18" id="68">Templates</a>
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<ul class="simple nested-toc-section">withConn
<li><a class="reference" href="#withConn.t%2CDbConnPool%2Cuntyped"
title="withConn(pool: DbConnPool; stmt: untyped): untyped">withConn(pool: DbConnPool; stmt: untyped): untyped</a></li>
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<p class="module-desc">Simple database connection pooling implementation compatible with Fiber ORM.</p>
<div class="section" id="7">
<h1><a class="toc-backref" href="#7">Types</a></h1>
<dl class="item">
<div id="DbConnPool">
<dt><pre><a href="pool.html#DbConnPool"><span class="Identifier">DbConnPool</span></a> <span class="Other">=</span> <span class="Keyword">ref</span> <span class="Keyword">object</span>
<span class="Identifier">conns</span><span class="Other">:</span> <span class="Identifier">seq</span><span class="Other">[</span><span class="Identifier">PooledDbConn</span><span class="Other">]</span>
<span class="Identifier">cfg</span><span class="Other">:</span> <a href="pool.html#DbConnPoolConfig"><span class="Identifier">DbConnPoolConfig</span></a>
<span class="Identifier">lastId</span><span class="Other">:</span> <span class="Identifier">int</span>
</pre></dt>
<dd>
Database connection pool
<a
href="https://github.com/jdbernard/fiber-orm/tree/version-1-6/src/fiber_orm/pool.nim#L35"
class="link-seesrc" target="_blank">Source</a>
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</dd>
</div>
<div id="DbConnPoolConfig">
<dt><pre><a href="pool.html#DbConnPoolConfig"><span class="Identifier">DbConnPoolConfig</span></a> <span class="Other">=</span> <span class="Keyword">object</span>
<span class="Identifier">connect</span><span class="Operator">*</span><span class="Other">:</span> <span class="Other">(</span><span class="Other">)</span> <span class="Operator">-></span> <span class="Identifier">DbConn</span> <span class="Comment">## Factory procedure to create a new DBConn</span>
<span class="Identifier">poolSize</span><span class="Operator">*</span><span class="Other">:</span> <span class="Identifier">int</span> <span class="Comment">## The pool capacity.</span>
<span class="Identifier">hardCap</span><span class="Operator">*</span><span class="Other">:</span> <span class="Identifier">bool</span> <span class="Comment">## Is the pool capacity a hard cap?</span>
<span class="Comment">## </span>
<span class="Comment">## When `false`, the pool can grow beyond the configured</span>
<span class="Comment">## capacity, but will release connections down to the its</span>
<span class="Comment">## capacity (no less than `poolSize`).</span>
<span class="Comment">## </span>
<span class="Comment">## When `true` the pool will not create more than its</span>
<span class="Comment">## configured capacity. It a connection is requested, none</span>
<span class="Comment">## are free, and the pool is at capacity, this will result</span>
<span class="Comment">## in an Error being raised.</span>
<span class="Identifier">healthCheckQuery</span><span class="Operator">*</span><span class="Other">:</span> <span class="Identifier">string</span> <span class="Comment">## Should be a simple and fast SQL query that the</span>
<span class="Comment">## pool can use to test the liveliness of pooled</span>
<span class="Comment">## connections.</span>
</pre></dt>
<dd>
<a
href="https://github.com/jdbernard/fiber-orm/tree/version-1-6/src/fiber_orm/pool.nim#L13"
class="link-seesrc" target="_blank">Source</a>
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</dd>
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</dl></div>
<div class="section" id="12">
<h1><a class="toc-backref" href="#12">Procs</a></h1>
<dl class="item">
<div id="initDbConnPool,DbConnPoolConfig">
<dt><pre><span class="Keyword">proc</span> <a href="#initDbConnPool%2CDbConnPoolConfig"><span class="Identifier">initDbConnPool</span></a><span class="Other">(</span><span class="Identifier">cfg</span><span class="Other">:</span> <a href="pool.html#DbConnPoolConfig"><span class="Identifier">DbConnPoolConfig</span></a><span class="Other">)</span><span class="Other">:</span> <a href="pool.html#DbConnPool"><span class="Identifier">DbConnPool</span></a> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
<a
href="https://github.com/jdbernard/fiber-orm/tree/version-1-6/src/fiber_orm/pool.nim#L47"
class="link-seesrc" target="_blank">Source</a>
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</dd>
</div>
<div id="release,DbConnPool,int">
<dt><pre><span class="Keyword">proc</span> <a href="#release%2CDbConnPool%2Cint"><span class="Identifier">release</span></a><span class="Other">(</span><span class="Identifier">pool</span><span class="Other">:</span> <a href="pool.html#DbConnPool"><span class="Identifier">DbConnPool</span></a><span class="Other">;</span> <span class="Identifier">connId</span><span class="Other">:</span> <span class="Identifier">int</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">void</span> {.
<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">,</span> <span class="Identifier">ValueError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Release a connection back to the pool.
<a
href="https://github.com/jdbernard/fiber-orm/tree/version-1-6/src/fiber_orm/pool.nim#L116"
class="link-seesrc" target="_blank">Source</a>
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</dd>
</div>
<div id="take,DbConnPool">
<dt><pre><span class="Keyword">proc</span> <a href="#take%2CDbConnPool"><span class="Identifier">take</span></a><span class="Other">(</span><span class="Identifier">pool</span><span class="Other">:</span> <a href="pool.html#DbConnPool"><span class="Identifier">DbConnPool</span></a><span class="Other">)</span><span class="Other">:</span> <span class="Keyword">tuple</span><span class="Other">[</span><span class="Identifier">id</span><span class="Other">:</span> <span class="Identifier">int</span><span class="Other">,</span> <span class="Identifier">conn</span><span class="Other">:</span> <span class="Identifier">DbConn</span><span class="Other">]</span> {.
<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">,</span> <span class="Identifier">ValueError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">,</span> <span class="Identifier">ReadDbEffect</span><span class="Other">,</span> <span class="Identifier">DbEffect</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
<p>Request a connection from the pool. Returns a DbConn if the pool has free connections, or if it has the capacity to create a new connection. If the pool is configured with a hard capacity limit and is out of free connections, this will raise an Error.</p>
<p>Connections taken must be returned via <tt class="docutils literal"><span class="pre"><span class="Identifier">release</span></span></tt> when the caller is finished using them in order for them to be released back to the pool.</p>
<a
href="https://github.com/jdbernard/fiber-orm/tree/version-1-6/src/fiber_orm/pool.nim#L94"
class="link-seesrc" target="_blank">Source</a>
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</dd>
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<div class="section" id="18">
<h1><a class="toc-backref" href="#18">Templates</a></h1>
<dl class="item">
<div id="withConn.t,DbConnPool,untyped">
<dt><pre><span class="Keyword">template</span> <a href="#withConn.t%2CDbConnPool%2Cuntyped"><span class="Identifier">withConn</span></a><span class="Other">(</span><span class="Identifier">pool</span><span class="Other">:</span> <a href="pool.html#DbConnPool"><span class="Identifier">DbConnPool</span></a><span class="Other">;</span> <span class="Identifier">stmt</span><span class="Other">:</span> <span class="Identifier">untyped</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">untyped</span></pre></dt>
<dd>
<p>Convenience template to provide a connection from the pool for use in a statement block, automatically releasing that connnection when done.</p>
<p>The provided connection is injected as the variable <tt class="docutils literal"><span class="pre"><span class="Identifier">conn</span></span></tt> in the statement body.</p>
<a
href="https://github.com/jdbernard/fiber-orm/tree/version-1-6/src/fiber_orm/pool.nim#L122"
class="link-seesrc" target="_blank">Source</a>
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