Hi, all,
Please consider this construct:
function rowCallback(dbRow){
// Notes below ref to this scope
}
myDbDriver.query({
sql:"SELECT * FROM T",
callback: rowCallback
});
That hypothetical code would run the given query and call the given
callback for each row. What i would like to do here, but don't know how,
is: before the callback is called, i would like to inject some custom
variables such that they could be resolved unqualified in the callback. For
example, let's extend the above callback:
function rowCallback(dbRow){
// dbRow == Array or Object of db row data.
// rowNumber == the current row number
// colNames == Array of column names
// colCount == column count
var i;
for( i = 0; i < colCount; ++i ){
... do something with each column ...
print(colNames[i]+'='+dbRow[i]);
}
}
How can i (or is it even possible) to inject variables this way from a
native-level InvocationCallback before it passes on the call callback()
back to script-land? If i can do this, the callback wouldn't need any
parameters - all state could be injected this way. i know i could build a
custom object with these properties and set it as the "this" for the call,
but i'm looking for a way where the callback does not have to this.qualify
each of the symbols (and without using the "with" keyword).
:-?
--
----- stephan beal
http://wanderinghorse.net/home/stephan/
http://gplus.to/sgbeal
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