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		<option value="//api/name/inTransaction:">- inTransaction:</option>
		
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					<h1 class="title">FMDatabaseQueue Class Reference</h1>

					
					<div class="section section-specification"><table cellspacing="0"><tbody>
						<tr>
	<th>Inherits from</th>
	<td>NSObject</td>
</tr><tr>
	<th>Declared in</th>
	<td>FMDatabaseQueue.h<br />FMDatabaseQueue.m</td>
</tr>
						</tbody></table></div>
					

                    
					
					<div class="section section-overview">
						<a title="Overview" name="overview"></a>
						<h2 class="subtitle subtitle-overview">Overview</h2>
						<p>To perform queries and updates on multiple threads, you&rsquo;ll want to use <code>FMDatabaseQueue</code>.</p>

<p>Using a single instance of <a href="../Classes/FMDatabase.html"><code>FMDatabase</code></a> from multiple threads at once is a bad idea.  It has always been OK to make a <a href="../Classes/FMDatabase.html"><code>FMDatabase</code></a> object <em>per thread</em>.  Just don&rsquo;t share a single instance across threads, and definitely not across multiple threads at the same time.</p>

<p>Instead, use <code>FMDatabaseQueue</code>. Here&rsquo;s how to use it:</p>

<p>First, make your queue.</p>

<pre><code>FMDatabaseQueue *queue = [FMDatabaseQueue databaseQueueWithPath:aPath];
</code></pre>

<p>Then use it like so:</p>

<pre><code>[queue inDatabase:^(FMDatabase *db) {
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:1]];
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:2]];
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:3]];

    FMResultSet *rs = [db executeQuery:@"select * from foo"];
    while ([rs next]) {
        //…
    }
}];
</code></pre>

<p>An easy way to wrap things up in a transaction can be done like this:</p>

<pre><code>[queue inTransaction:^(FMDatabase *db, BOOL *rollback) {
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:1]];
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:2]];
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:3]];

    if (whoopsSomethingWrongHappened) {
        *rollback = YES;
        return;
    }
    // etc…
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:4]];
}];
</code></pre>

<p><code>FMDatabaseQueue</code> will run the blocks on a serialized queue (hence the name of the class).  So if you call <code>FMDatabaseQueue</code>&rsquo;s methods from multiple threads at the same time, they will be executed in the order they are received.  This way queries and updates won&rsquo;t step on each other&rsquo;s toes, and every one is happy.</p>

<h3>See also</h3>

<ul>
<li><a href="../Classes/FMDatabase.html"><code>FMDatabase</code></a></li>
</ul>
<div class="warning"><p><strong>Warning:</strong> Do not instantiate a single <a href="../Classes/FMDatabase.html"><code>FMDatabase</code></a> object and use it across multiple threads. Use <code>FMDatabaseQueue</code> instead.</p></div><div class="warning"><p><strong>Warning:</strong> The calls to <code>FMDatabaseQueue</code>&rsquo;s methods are blocking.  So even though you are passing along blocks, they will <strong>not</strong> be run on another thread.</p></div>
					</div>
					
					

					
					
					<div class="section section-tasks">
						<a title="Tasks" name="tasks"></a>
						

						
						<h2 class="task-title">Other Methods</h2>

						<div class="task-list">
							<div class="section-method">
	<a name="//api/name/databaseQueueWithPath:" title="databaseQueueWithPath:"></a>
	<h3 class="method-title"><code><a href="#//api/name/databaseQueueWithPath:">+&nbsp;databaseQueueWithPath:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Create queue using path.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>+ (instancetype)databaseQueueWithPath:(NSString *)<em>aPath</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>aPath</code></th>
						<td><p>The file path of the database.</p></td>
					</tr>
				
				</table>
			</div>
			

			
			<div class="method-subsection return">
				<h4 class="method-subtitle parameter-title">Return Value</h4>
				<p>The <code>FMDatabaseQueue</code> object. <code>nil</code> on error.</p>
			</div>
			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Create queue using path.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/databaseQueueWithPath:flags:" title="databaseQueueWithPath:flags:"></a>
	<h3 class="method-title"><code><a href="#//api/name/databaseQueueWithPath:flags:">+&nbsp;databaseQueueWithPath:flags:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Create queue using path and specified flags.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>+ (instancetype)databaseQueueWithPath:(NSString *)<em>aPath</em> flags:(int)<em>openFlags</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>aPath</code></th>
						<td><p>The file path of the database.</p></td>
					</tr>
				
					<tr>
						<th scope="row" class="argument-name"><code>openFlags</code></th>
						<td><p>Flags passed to the openWithFlags method of the database</p></td>
					</tr>
				
				</table>
			</div>
			

			
			<div class="method-subsection return">
				<h4 class="method-subtitle parameter-title">Return Value</h4>
				<p>The <code>FMDatabaseQueue</code> object. <code>nil</code> on error.</p>
			</div>
			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Create queue using path and specified flags.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/databaseClass" title="databaseClass"></a>
	<h3 class="method-title"><code><a href="#//api/name/databaseClass">+&nbsp;databaseClass</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Returns the Class of &lsquo;FMDatabase&rsquo; subclass, that will be used to instantiate database object.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>+ (Class)databaseClass</code></div>

		    
			

			
			<div class="method-subsection return">
				<h4 class="method-subtitle parameter-title">Return Value</h4>
				<p>The Class of &lsquo;FMDatabase&rsquo; subclass, that will be used to instantiate database object.</p>
			</div>
			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Returns the Class of &lsquo;FMDatabase&rsquo; subclass, that will be used to instantiate database object.</p>

<p>Subclasses can override this method to return specified Class of &lsquo;FMDatabase&rsquo; subclass.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/initWithPath:flags:" title="initWithPath:flags:"></a>
	<h3 class="method-title"><code><a href="#//api/name/initWithPath:flags:">&ndash;&nbsp;initWithPath:flags:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Create queue using path and specified flags.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>- (instancetype)initWithPath:(NSString *)<em>aPath</em> flags:(int)<em>openFlags</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>aPath</code></th>
						<td><p>The file path of the database.</p></td>
					</tr>
				
					<tr>
						<th scope="row" class="argument-name"><code>openFlags</code></th>
						<td><p>Flags passed to the openWithFlags method of the database</p></td>
					</tr>
				
				</table>
			</div>
			

			
			<div class="method-subsection return">
				<h4 class="method-subtitle parameter-title">Return Value</h4>
				<p>The <code>FMDatabaseQueue</code> object. <code>nil</code> on error.</p>
			</div>
			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Create queue using path and specified flags.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/initWithPath:" title="initWithPath:"></a>
	<h3 class="method-title"><code><a href="#//api/name/initWithPath:">&ndash;&nbsp;initWithPath:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Create queue using path.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>- (instancetype)initWithPath:(NSString *)<em>aPath</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>aPath</code></th>
						<td><p>The file path of the database.</p></td>
					</tr>
				
				</table>
			</div>
			

			
			<div class="method-subsection return">
				<h4 class="method-subtitle parameter-title">Return Value</h4>
				<p>The <code>FMDatabaseQueue</code> object. <code>nil</code> on error.</p>
			</div>
			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Create queue using path.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/close" title="close"></a>
	<h3 class="method-title"><code><a href="#//api/name/close">&ndash;&nbsp;close</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Close database used by queue.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>- (void)close</code></div>

		    
			

			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Close database used by queue.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/inDatabase:" title="inDatabase:"></a>
	<h3 class="method-title"><code><a href="#//api/name/inDatabase:">&ndash;&nbsp;inDatabase:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Synchronously perform database operations on queue.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>- (void)inDatabase:(void ( ^ ) ( FMDatabase *db ))<em>block</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>block</code></th>
						<td><p>The code to be run on the queue of <code>FMDatabaseQueue</code></p></td>
					</tr>
				
				</table>
			</div>
			

			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Synchronously perform database operations on queue.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/inDeferredTransaction:" title="inDeferredTransaction:"></a>
	<h3 class="method-title"><code><a href="#//api/name/inDeferredTransaction:">&ndash;&nbsp;inDeferredTransaction:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Synchronously perform database operations on queue, using deferred transactions.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>- (void)inDeferredTransaction:(void ( ^ ) ( FMDatabase *db , BOOL *rollback ))<em>block</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>block</code></th>
						<td><p>The code to be run on the queue of <code>FMDatabaseQueue</code></p></td>
					</tr>
				
				</table>
			</div>
			

			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Synchronously perform database operations on queue, using deferred transactions.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/inTransaction:" title="inTransaction:"></a>
	<h3 class="method-title"><code><a href="#//api/name/inTransaction:">&ndash;&nbsp;inTransaction:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Synchronously perform database operations on queue, using transactions.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>- (void)inTransaction:(void ( ^ ) ( FMDatabase *db , BOOL *rollback ))<em>block</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>block</code></th>
						<td><p>The code to be run on the queue of <code>FMDatabaseQueue</code></p></td>
					</tr>
				
				</table>
			</div>
			

			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Synchronously perform database operations on queue, using transactions.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/inSavePoint:" title="inSavePoint:"></a>
	<h3 class="method-title"><code><a href="#//api/name/inSavePoint:">&ndash;&nbsp;inSavePoint:</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Synchronously perform database operations using save point.</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>- (NSError *)inSavePoint:(void ( ^ ) ( FMDatabase *db , BOOL *rollback ))<em>block</em></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>block</code></th>
						<td><p>The code to be run on the queue of <code>FMDatabaseQueue</code></p></td>
					</tr>
				
				</table>
			</div>
			

			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Synchronously perform database operations using save point.</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div>
						</div>
						

						
						<h2 class="task-title">Other Methods</h2>

						<div class="task-list">
							<div class="section-method">
	<a name="//api/name/path" title="path"></a>
	<h3 class="method-title"><code><a href="#//api/name/path">&nbsp;&nbsp;path</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Path of database</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>@property (atomic, retain) NSString *path</code></div>

		    
			

			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Path of database</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div><div class="section-method">
	<a name="//api/name/openFlags" title="openFlags"></a>
	<h3 class="method-title"><code><a href="#//api/name/openFlags">&nbsp;&nbsp;openFlags</a></code>
</h3>

	<div class="method-info">
		<div class="pointy-thing"></div>

		<div class="method-info-container">
			
			
			<div class="method-subsection brief-description">
				<p>Open flags</p>
			</div>
			
		    

			<div class="method-subsection method-declaration"><code>@property (atomic, readonly) int openFlags</code></div>

		    
			

			

			

			
			<div class="method-subsection discussion-section">
				<h4 class="method-subtitle">Discussion</h4>
				<p>Open flags</p>
			</div>
			

			

			

			
			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code class="declared-in-ref">FMDatabaseQueue.h</code></p>
			</div>
			
			
		</div>
	</div>
</div>
						</div>
						
					</div>
					
					

                    
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