查看“用户变量”的源代码


用户变量允许你将自定义变量保存到Domoticz数据库中。可以存储以下五种类型的数据:

 0 = 整数, e.g. -1, 1, 0, 2, 10  
 1 = 浮点数, e.g. -1.1, 1.2, 3.1
 2 = 字符串
 3 = 格式化日期 DD/MM/YYYY
 4 = 24小时制时间 HH:MM

Upon storing, domoticz checks the variable value for a correct format according to the type chosen. Storing the variable type with the variable will enable us to safely use these variables elsewhere in the system, this is why the check is always enforced (via user interface, api and event system). The string variable is the easiest one to use since it does not have any checks, but do not expect much intelligence from domoticz on this field later on. 

Maximum size is 200 bytes.

== Management through the webinterface ==

To manage these variables, go to Setup > User variables from the main screen. The management screen shows a table of existing variables, plus the option to create, edit or delete. To add a new variable, fill out the required fields and click "Add". To update a variable, first click on it in the list, then edit the fields and click "Update". To delete a variable, click on it in the list and then select "Delete". 

== Management through the API ==

See the api documentation: [http://www.domoticz.com/wiki/Domoticz_API/JSON_URL%27s#User_variables]

== Events ==

User variables can trigger events, and can also be read and updated through events. Whenever a variable is changed through the API or the webinterface, the event system is triggered. In Lua, scripts in the format script_variable_name.lua will be run, and Blockly will be checked for the relevant variable as well. In the event logic variables can be used and/or updated, but not added. Therefore if you wish to use variables in events, you have to create them first in the user interface. Note that setting a variable through an event does not trigger the event logic again since this can create a nasty loop. 

For more info on using variables in events see [http://www.domoticz.com/wiki/Events]

== Lua ==

When using user variables in Lua, keep in mind the following: variables are always stored as a string in the Domoticz database, regardless of their type. The variables are passed in arrays to Lua, at that point they will always be strings also. So when you're working with strings in Lua this has no implications, e.g.:
<syntaxhighlight lang="lua">
 if ( uservariables["MyVar"] == "On" ) then
  commandArray['Variable:MyOtherVar']= uservariables["MyVar"]
</syntaxhighlight>
will work: MyVar is a string, and goes back into the commandArray as a string. 

Lua is smart enough to convert strings to numbers when a math operation is requested, but when you put it back in a commandArray remember to convert back to string:
<syntaxhighlight lang="lua">
 commandArray['Variable:MyVar']= uservariables["MyVar"] +25
</syntaxhighlight>
will not work. If uservariables["MyVar"] contains a string representing a number it will be increased by 25, but the commandArray will not accept a number. 
<syntaxhighlight lang="lua">
 commandArray['Variable:MyVar']= tostring(uservariables["MyVar"] +25)
</syntaxhighlight>
will work. The resulting number is converted to a string.

== Lua ==

The following script will update the following user variables (year,month,day,hour,min,weekday,season,weekend,dark) that can be used in other scripts
You will have to create the variables first.


<syntaxhighlight lang="lua">
----------------------------------------------------------------------------------------------------------
-- Script parameters
----------------------------------------------------------------------------------------------------------
Debug = "NO"                    -- Turn debugging on ("YES") or off ("NO")

----------------------------------------------------------------------------------------------------------
-- Script functions
----------------------------------------------------------------------------------------------------------
function WhichSeason()
     local tNow = os.date("*t")
     local dayofyear = tNow.yday
     local season
     if (dayofyear >= 79) and (dayofyear < 172) then season = "Spring"
     elseif (dayofyear >= 172) and (dayofyear < 266) then season = "Summer"
     elseif (dayofyear >= 266) and (dayofyear < 355) then season = "Autumn"
     else season = "Winter"
     end
     return season
end

function IsWeekend()
     local dayNow = tonumber(os.date("%w"))
     local weekend
     if (dayNow == 0) or (dayNow == 6) then weekend = "True"
     else weekend = "False"
     end 
     return weekend
end


function IsDark()
    local dark
    if (timeofday['Nighttime']) then dark = "True"
    else dark = "False"
    end
    return dark
end


----------------------------------------------------------------------------------------------------------
-- CommandArray
----------------------------------------------------------------------------------------------------------

commandArray = {}

-- 		Setting the time variables:
--		%a	abbreviated weekday name (e.g., Wed)
--		%A	full weekday name (e.g., Wednesday)
--		%b	abbreviated month name (e.g., Sep)
--		%B	full month name (e.g., September)
--		%c	date and time (e.g., 09/16/98 23:48:10)
--		%d	day of the month (16) [01-31]
--		%H	hour, using a 24-hour clock (23) [00-23]
--		%I	hour, using a 12-hour clock (11) [01-12]
--		%M	minute (48) [00-59]
--		%m	month (09) [01-12]
--		%p	either "am" or "pm" (pm)
--		%S	second (10) [00-61]
--		%w	weekday (3) [0-6 = Sunday-Saturday]
--		%x	date (e.g., 09/16/98)
--		%X	time (e.g., 23:48:10)
--		%Y	full year (1998)
--		%y	two-digit year (98) [00-99]
--		%%	the character `%´

year 	= tonumber(os.date("%Y"));
month 	= tonumber(os.date("%m"));
day 	= tonumber(os.date("%d"));
hour 	= tonumber(os.date("%H"));
min 	= tonumber(os.date("%M"));
weekday = tonumber(os.date("%w"));
season  = WhichSeason();
weekend = IsWeekend();
dark    = IsDark();

if Debug=="YES" then
	print(' Year: '  .. year .. ' ');
	print(' Month: '  .. month .. ' ');
	print(' Day: '  .. day .. ' ');
	print(' Hour: '  .. hour .. ' ');
	print(' Minute: '  .. min .. ' ');
	print(' Weekday: '  .. weekday .. ' ');
	print(' Season: ' .. season .. ' ');
	print(' Weekend: ' .. weekend .. ' ');
        print(' Dark: ' .. dark .. ' ');
	end

print("Updating variables if necessary")

if (uservariables["Year"] ~= year) then commandArray['Variable:Year'] = tostring(year)   end
if (uservariables["Month"] ~= month) then commandArray['Variable:Month'] = tostring(month)   end
if (uservariables["Day"] ~= day) then commandArray['Variable:Day'] = tostring(day)   end
if (uservariables["Hour"] ~= hour) then commandArray['Variable:Hour'] = tostring(hour)   end
if (uservariables["Minute"] ~= min) then commandArray['Variable:Minute'] = tostring(min)   end
if (uservariables["Weekday"] ~= weekday) then commandArray['Variable:Weekday'] = tostring(weekday)   end
if (uservariables["Season"] ~= season) then commandArray['Variable:Season'] = tostring(season)   end
if (uservariables["Weekend"] ~= weekend) then commandArray['Variable:Weekend'] = tostring(weekend)   end
if (uservariables["Dark"] ~= dark) then commandArray['Variable:Dark'] = tostring(dark)   end


return commandArray

</syntaxhighlight>

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[[Category:脚本]]
[[Category:Lua]]