Alberto Alonso at 17:59, 5 January 2011

2011-01-05T17:59:03Z

← Older revision		Revision as of 17:59, 5 January 2011
Line 1:		Line 1:
			<pageclass class="#AA7592" subcaption="MTA-MySQL Module"></pageclass>
	__NOTOC__		__NOTOC__
	{{ModuleFunction\|MTA-MySQL}}		{{ModuleFunction\|MTA-MySQL}}

Ryden at 18:02, 14 January 2008

2008-01-14T18:02:03Z

← Older revision		Revision as of 18:02, 14 January 2008
Line 1:		Line 1:
	__NOTOC__		__NOTOC__
			{{ModuleFunction\|MTA-MySQL}}
	Executes an unbuffered query in the server and retreives the result.		Executes an unbuffered query in the server and retreives the result.

Ryden: New page: NOTOC Executes an unbuffered query in the server and retreives the result. '''IMPORTANT:''' It is '''strongly''' recommended to call [[Modules/MTA-MySQL/mysql_free_result|mysql_free_...

2008-01-13T18:20:36Z

New page: __NOTOC__ Executes an unbuffered query in the server and retreives the result. '''IMPORTANT:''' It is '''strongly''' recommended to call [[Modules/MTA-MySQL/mysql_free_result|mysql_free_...

New page

__NOTOC__
Executes an unbuffered query in the server and retreives the result.

'''IMPORTANT:''' It is '''strongly''' recommended to call [[Modules/MTA-MySQL/mysql_free_result|mysql_free_result]] after a query,
specially if it returns some data. Query results can be automatically deleted
by the lua garbage collector, so if you '''forget''' to free a result it will be
freed at some time in the future, but it doesn't know the real result data size
in memory so it can delay the memory destroying more than it should.

'''IMPORTANT:''' Unbuffered queries are to iterate a set of results improving the
performance since they are not pre-loaded in memory, so if you execute an unbuffered
query you '''must''' iterate all the result rows. For more information about unbuffered
queries visit http://dev.mysql.com/doc/refman/5.0/en/mysql-use-result.html

==Syntax==
<syntaxhighlight lang="lua">
MySQLResult mysql_unbuffered_query ( MySQLConnection handler, string query )
</syntaxhighlight>
===Required arguments===
* '''handler:''' A valid MySQL link
* '''query:''' The executing query

===Returns===
In case of error this function returns nil. IF not, a MySQLResult handler. Check the MySQL result managing functions to see how to retreive the data from it.

==Example==
'''Example 1:'''
<syntaxhighlight lang="lua">
local result = mysql_unbuffered_query(handler, "SELECT * FROM some_table")
if (not result) then
outputDebugString("Error executing the query: (" .. mysql_errno(handler) .. ") " .. mysql_error(handler))
else
local numrows = 0
for result,row in mysql_rows(result) do -- We MUST iterate all the query resulting rows
numrows = numrows + 1
end
outputDebugString("The query returned a total of " .. numrows .. " rows")
mysql_free_result(result) -- Freeing the result is IMPORTANT
end
</syntaxhighlight>

==See also==
===Result managing functions===
{{Modules/MTA-MySQL/Result_functions}}
===MySQL handler functions===
{{Modules/MTA-MySQL/Handler_functions}}

Modules/MTA-MySQL/mysql unbuffered query - Revision history

Alberto Alonso at 17:59, 5 January 2011

Ryden at 18:02, 14 January 2008

Ryden: New page: __NOTOC__ Executes an unbuffered query in the server and retreives the result. '''IMPORTANT:''' It is '''strongly''' recommended to call [[Modules/MTA-MySQL/mysql_free_result|mysql_free_...

Ryden: New page: NOTOC Executes an unbuffered query in the server and retreives the result. '''IMPORTANT:''' It is '''strongly''' recommended to call [[Modules/MTA-MySQL/mysql_free_result|mysql_free_...