Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Correct timeout remarks for async command methods #264

Merged
merged 1 commit into from
Oct 15, 2019
Merged

Correct timeout remarks for async command methods #264

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 14 additions & 3 deletions doc/snippets/Microsoft.Data.SqlClient/SqlCommand.xml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -232,12 +232,15 @@ You can change the value for any of these parameters by setting the related prop
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method starts the process of asynchronously executing a Transact-SQL statement or stored procedure that does not return rows, so that other tasks can run concurrently while the statement is executing. When the statement has completed, developers must call the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method to finish the operation. The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method returns immediately (<xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> has no effect on <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A>), but until the code executes the corresponding <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method call, it must not execute any other calls that start a synchronous or asynchronous execution against the same <xref:Microsoft.Data.SqlClient.SqlCommand> object. Calling the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> before the command's execution is completed causes the <xref:Microsoft.Data.SqlClient.SqlCommand> object to block until the execution is finished.
The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method starts the process of asynchronously executing a Transact-SQL statement or stored procedure that does not return rows, so that other tasks can run concurrently while the statement is executing. When the statement has completed, developers must call the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method to finish the operation. The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method returns immediately, but until the code executes the corresponding <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method call, it must not execute any other calls that start a synchronous or asynchronous execution against the same <xref:Microsoft.Data.SqlClient.SqlCommand> object. Calling the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> before the command's execution is completed causes the <xref:Microsoft.Data.SqlClient.SqlCommand> object to block until the execution is finished.

Note that the command text and parameters are sent to the server synchronously. If a large command or many parameters are sent, this method may block during writes. After the command is sent, the method returns immediately without waiting for an answer from the server--that is, reads are asynchronous.

Because this overload does not support a callback procedure, developers must either poll to determine whether the command has completed, using the <xref:System.IAsyncResult.IsCompleted%2A> property of the <xref:System.IAsyncResult> returned by the <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method; or wait for the completion of one or more commands using the <xref:System.IAsyncResult.AsyncWaitHandle%2A> property of the returned <xref:System.IAsyncResult>.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.


## Examples
The following console application creates updates data within the **AdventureWorks** sample database, doing its work asynchronously. In order to emulate a long-running process, this example inserts a WAITFOR statement in the command text. Normally, you would not take efforts to make your commands run slower, but doing this in this case makes it easier to demonstrate the asynchronous behavior.

Expand Down Expand Up @@ -341,7 +344,7 @@ The following console application creates updates data within the **AdventureWor
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method starts the process of asynchronously executing a Transact-SQL statement or stored procedure that does not return rows, so that other tasks can run concurrently while the statement is executing. When the statement has completed, developers must call the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method to finish the operation. The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method returns immediately (<xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> has no effect on <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A>), but until the code executes the corresponding <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method call, it must not execute any other calls that start a synchronous or asynchronous execution against the same <xref:Microsoft.Data.SqlClient.SqlCommand> object. Calling the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> before the command's execution is completed causes the <xref:Microsoft.Data.SqlClient.SqlCommand> object to block until the execution is finished.
The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method starts the process of asynchronously executing a Transact-SQL statement or stored procedure that does not return rows, so that other tasks can run concurrently while the statement is executing. When the statement has completed, developers must call the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method to finish the operation. The <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method returns immediately, but until the code executes the corresponding <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method call, it must not execute any other calls that start a synchronous or asynchronous execution against the same <xref:Microsoft.Data.SqlClient.SqlCommand> object. Calling the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> before the command's execution is completed causes the <xref:Microsoft.Data.SqlClient.SqlCommand> object to block until the execution is finished.

The `callback` parameter lets you specify an <xref:System.AsyncCallback> delegate that is called when the statement has completed. You can call the <xref:Microsoft.Data.SqlClient.SqlCommand.EndExecuteNonQuery%2A> method from within this delegate procedure, or from any other location within your application. In addition, you can pass any object in the `asyncStateObject` parameter, and your callback procedure can retrieve this information using the <xref:System.IAsyncResult.AsyncState%2A> property.

Expand All @@ -351,6 +354,7 @@ Because the callback procedure executes from within a background thread supplied

All errors that occur during the execution of the operation are thrown as exceptions in the callback procedure. You must handle the exception in the callback procedure, not in the main application. See the example in this topic for additional information on handling exceptions in the callback procedure.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.

## Examples
The following Windows application demonstrates the use of the <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteNonQuery%2A> method, executing a Transact-SQL statement that includes a delay of several seconds (emulating a long-running command).
Expand Down Expand Up @@ -437,6 +441,8 @@ Because this overload does not support a callback procedure, developers must eit

If you use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A> to access XML data, SQL Server will return any XML results greater than 2,033 characters in length in multiple rows of 2,033 characters each. To avoid this behavior, use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteXmlReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteXmlReader%2A> to read FOR XML queries.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.


## Examples
The following console application starts the process of retrieving a data reader asynchronously. While waiting for the results, this simple application sits in a loop, investigating the <xref:System.IAsyncResult.IsCompleted%2A> property value. As soon as the process has completed, the code retrieves the <xref:Microsoft.Data.SqlClient.SqlDataReader> and displays its contents.
Expand Down Expand Up @@ -546,6 +552,7 @@ Because this overload does not support a callback procedure, developers must eit

If you use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A> to access XML data, SQL Server returns any XML results greater than 2,033 characters in length in multiple rows of 2,033 characters each. To avoid this behavior, use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteXmlReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteXmlReader%2A> to read FOR XML queries.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.


## Examples
Expand Down Expand Up @@ -667,6 +674,7 @@ All errors that occur during the execution of the operation are thrown as except

If you use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A> to access XML data, SQL Server returns any XML results greater than 2,033 characters in length in multiple rows of 2,033 characters each. To avoid this behavior, use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteXmlReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteXmlReader%2A> to read FOR XML queries.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.


## Examples
Expand Down Expand Up @@ -799,6 +807,7 @@ All errors that occur during the execution of the operation are thrown as except

If you use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A> to access XML data, SQL Server will return any XML results greater than 2,033 characters in length in multiple rows of 2,033 characters each. To avoid this behavior, use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteXmlReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteXmlReader%2A> to read FOR XML queries.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.


## Examples
Expand Down Expand Up @@ -918,6 +927,7 @@ Because this overload does not support a callback procedure, developers need to

If you use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A> to access XML data, SQL Server returns any XML results greater than 2,033 characters in length in multiple rows of 2,033 characters each. To avoid this behavior, use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteXmlReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteXmlReader%2A> to read FOR XML queries.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.


## Examples
Expand Down Expand Up @@ -1047,6 +1057,7 @@ All errors that occur during the execution of the operation are thrown as except

If you use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A> to access XML data, SQL Server will return any XML results greater than 2,033 characters in length in multiple rows of 2,033 characters each. To avoid this behavior, use <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteXmlReader%2A> or <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteXmlReader%2A> to read FOR XML queries.

This method ignores the <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property.


## Examples
Expand Down Expand Up @@ -1217,7 +1228,7 @@ The following example creates a <xref:Microsoft.Data.SqlClient.SqlCommand> and s
A value of 0 indicates no limit (an attempt to execute a command will wait indefinitely).

> [!NOTE]
> The <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property will be ignored during asynchronous method calls such as <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A>.
> The <xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> property will be ignored during old-style asynchronous method calls such as <xref:Microsoft.Data.SqlClient.SqlCommand.BeginExecuteReader%2A>. It will be honored by the newer async methods such as <xref:Microsoft.Data.SqlClient.SqlCommand.ExecuteReaderAsync%2A>.

<xref:Microsoft.Data.SqlClient.SqlCommand.CommandTimeout%2A> has no effect when the command is executed against a context connection (a <xref:Microsoft.Data.SqlClient.SqlConnection> opened with "context connection=true" in the connection string).

Expand Down