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Discussion -Name Expression, Evaluate, Macro Substitutio
Message
De
19/02/2007 17:23:59
 
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Programmation Orientée Object
Versions des environnements
Visual FoxPro:
VFP 9
OS:
Windows XP SP2
Network:
Windows 2003 Server
Database:
MS SQL Server
Divers
Thread ID:
01197046
Message ID:
01197156
Vues:
16
Ok, I apologize Naomi. I should have seen that in help! It works. Thanks so much! :o)



>Check GetKey method of the collection in Help.
>
>>Ok, I now have my collection of connection objects. Each connection object has properties which are used for the connection. Each also has a method which is used to create the connection, one to close the connection, etc. I am adding property to each which stores the current connection number. What is the quickest way to determine if a connection object of a specific name exists? For example, let's say I have the below connection objects:
>>
>>_Screen.myConnections('oProd1_Qcc')
>>_Screen.myConnections('oProd2_Hbb')
>>
>>oProd1_Qcc is a valid connection object (outside of the collection as well)
>>oProd2_Hbb is a valid connection object (outside of the collection as well)
>>
>>e.g. oProd2_Hbb.name returns 'oProd2_Hbb'
>>
>>How do I easily determine if a specific connection object such as 'oProd2_Hbb' exists? Checking TYPE and PEMSTATUS doesn't seem to work...
>>
>>
>>?[*** Does the oProd2_Hbb connection object exist? ]
>>lcSqlConfgConn = 'oProd2_Hbb'
>>? PEMSTATUS(_Screen,'myConnections',5)  && Returns .T. - This is correct
>>? TYPE(lcSqlConfgConn) ="O" .and. !ISNULL(lcSqlConfgConn) && returns .t. but this is the actual object, not the item in the collections property
>>? TYPE("_Screen.myconnections('oProd2_Hbb').name")      && Returns "U" should be an item in the collection
>>? _Screen.myconnections('oProd2_Hbb').name      && Returns 'oProd2.Hbb'
>>
>>* Yet the below all work:
>>
>>FOR EACH oControl IN _Screen.myConnections FOXOBJECT
>>    ? oControl.name  && Returns oProd2_Hbb when it gets to that item in the collection
>>    ? oControl.pcServer
>>    ? oControl.pcDatabase
>>    ? oControl.pcPassword
>>    ? oControl.pcUser
>>    ? oControl.pnEngine
>>ENDFOR
>>
>>
>>>>
>>>>There will be 1-10 objects (1 object created from each record). The name of the object will be determined by the values in 2 of the table's fields:
>>>>
>>>>1st Record Example:
>>>>mytable.field1 = 'DATA'
>>>>mytable.field2 = 'QCC'
>>>>
>>>>The created object's name will be oDATA_QCC for the first record.
>>>>
>>>>The servername property of oDATA_QCC will be 'myservername' e.g. :
>>>>
>>>>IF mytable.field3 = 'myservername':
>>>>
>>>>oDATA_QCC.servername = TRIM(mytable.field3)
>>>>
>>>>So the object can be referenced later based on the two fields in the table (in order to know which object to use)
>>>>
>>>
>>>I wouldn't make it the variable name that's based on the fields. Instead, put all of the objects into a collection and use the field information as the key into the collection:
>>>
>>>oDataObjects = CREATEOBECT("Collection")
>>>
>>>oObject = CREATEOBJECT("Whatever")
>>>* Populate oObject
>>>
>>>cKey = ALLTRIM(Field1) + "_" + ALLTRIM(Field2)
>>>oDataObjects.Add(m.oObject, m.cKey)
>>>
>>>Now to find a particular object, use:
>>>
>>>oDataObjects(< the key expression >)
>>>
>>>If you need them in a particular order, add that information to the object.
>>>
>>>Tamar
.·*´¨)
.·`TCH
(..·*

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