Using an index to retrieve a Field from the collection is faster because it accesses the Field directly without having to perform a string lookup. If these methods are equivalent, which is best? It depends. ObjField = objRecordset.Fields("ProductID") Therefore, the following statements are equivalent for the sample Recordset: objField = ("ProductID")
It returns the individual Field object specified by the name or index passed to it. Getting to the FieldĪs with any ADO collection, the Item property is the default property of the collection. If the Count property is zero, there are no objects in the collection. If you are using Microsoft Visual Basic and want to loop through the members of a collection without checking the Count property, use the For Each.Next command.
#Vba recordset loop through records wizard code#
Because numbering for members of a collection begins with zero, you should always code loops starting with the zero member and ending with the value of the Count property minus 1. Counting ColumnsĪs you might expect, the Count property returns the actual number of Field objects in the Fields collection. For more information about querying a Field, see The Field Object. You can use many more Field properties to get information about a field. This code simply determines the number of Field objects in the Fields collection using the Count property and loops through the collection, returning the value of the Name property for each Field object. ObjRs.Open strSQL, strConnStr, adOpenForwardOnly, adLockReadOnly, adCmdText Thus, you should find that the Recordset Fields collection contains three fields. The sample Recordset was derived from the SQL statement SELECT ProductID, ProductName, UnitPrice FROM Products WHERE CategoryID = 7 Examining the Fields CollectionĬonsider the Fields collection of the sample Recordset introduced in this section.
#Vba recordset loop through records wizard update#
It also has CancelUpdate, Delete, Resync, and Update methods, which are not available to other ADO collections. Like all ADO collections, it has Count and Item properties, as well as Append and Refresh methods. The Fields collection contains a Field object for every field (column) in the Recordset.
For more information about ADO collections, see The ADO Object Model. A collection is an ordered set of items that can be referred to as a unit. IF -> ((-(+9000))*0.The Fields collection is one of ADO's intrinsic collections.
To have this function be mimiced in an update query I would have to have two Amout_Due columns.hance getting a "Duplicate output destination" error from Access. ' CheckAmountTendered_CheckAmountTendered ' Bill Rate Increased to $5.50 / 1000 gallons on (MwS) If (.Current_Reading (.Last_Reading + 9000)) Then To get this string below, when looking at the query in design view, right-click on the blue bar at the top and select SQL view. At least, I didn't when I just tested the above before typing all this in.Īnd to tidy all this up try this skipping entirely the need to open recordsets. As long as both of your date fields are formatted properly, you shouldn't have a problem with a date to date comparison. It will update your data in the AMOUNT_DUE field only when DUE_DATE is more than 30 larger than DATE_BILLED.Īs additional information, frequently, working with dates can be difficult and requiring # characters in front of and following the date fields for them to be recognized properly. Hit the exclamation point (execute) at the top of the access window. Type exactly this: "AMOUNT_DUE *.1" (no quotes) On the screen you're going to see 4 rows of info.įirst shows name of fields, second name of table, third is what to 'update' the field into and last is labeled Criteria (put the 'where' parameters) Add only the fields above to a select queryĬhange it to an update query (top of Access window is a pull down menu) Go to QBE (Query by Example) - it's the wizard interface you can use when clicking on a 'new' query. Here's the easy way to puzzle through this. UPDATE tblName SET AMOUNT_DUE = AMOUNT_DUE *0.1
0 kommentar(er)
