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Scan QR Code ISO/IEC18004 In Visual C#.NET
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Part 6: Excel and the Outside World: Collaborating Made Easy
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Microsoft Office Excel 2003 Programming Inside Out
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Table 23-8.
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Key Properties and Methods of the Recordset Object
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Property/Method
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MoveNext MovePrevious Open RecordCount Sort Source Update
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Method: moves the current record pointer to the next row in the recordset. Method: moves the current record pointer to the previous row in the recordset. Method: gains access to the data in the Recordset. Property: contains the total number of rows retrieved from the database. Property: contains the list of column names on which the results should be sorted. Property: contains either an object reference to a Command object or a string with an SQL statement. Method: saves any changes you might have made to the current row to the database.
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The ActiveConnection property points either to the Connection object associated with Recordset, or it contains a connection string value. If the property contains a connection string, a con nection to the database will be automatically opened when the Recordset object is opened. The Source property contains either an object reference to a Command object or a string con taining the name of a table, a stored procedure or an SQL statement. If you assign a Command object to the source property, reading the source property will return the CommandText value from the Command object rather than an object reference. Once you ve set up all the information that you need to retrieve data from the database, use the Open method to gain access to the information in the Recordset object. When you are through with the data, use the Close method to release all the resources associated with the Recordset object. The Recordset object exposes the returned records from the database one row at a time. Internally, the Recordset object maintains a pointer referred to as the current record pointer, which points to the current record. Because only one record is available at a time, you must use the move methods (MoveFirst, MovePrevious, MoveNext, and MoveLast) to navigate your way through the records in the Recordset. The Move method allows you to jump forward or backward in the record the specified number of rows. As you move through the records in the Recordset, the BOF and EOF properties will automat ically be set as the current record pointer changes. BOF stands for Beginning Of File, and EOF stands for End Of File. The best way to think of these two properties is that they represent locations before the first row in the Recordset (BOF) and after the last row in the Recordset (EOF).
Part 6: Excel and the Outside World: Collaborating Made Easy
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Introducing ADO When you initially open the Recordset object, the current record pointer will point to the first row. Calling the MoveNext method will move the current record pointer through each of the rows, up to and including the last row. If the current record pointer is on the last row, calling MoveNext will set the EOF property to True. If you call MoveNext a second time, although the EOF property is True, you ll get an error. Tip The Ends of the Earth Never call the MoveNext method when the EOF property is True, and never call the MovePrevious method when the BOF property is True. Calling either of these methods will result in an error because it s impossible to move the current record pointer before the beginning of the Recordset (MovePrevious) or move the current record pointer after the end of the Recordset (MoveNext). The RecordCount property contains the total number of rows retrieved from the database. Remember that this property may have a value of -1, meaning that the total isn t known at the current time. If this happens, use the MoveLast method to move to the end of the Recordset. Using the MoveLast method will also update the RecordCount property. The Filter property can be used for several different purposes. The most useful is when you assign it a string value containing an expression similar to one you d use in an SQL Where clause. This technique can be useful if you wish to restrict the Recordset to only a subset of the data you just retrieved. Tip
Only Take What You Need Although you can use the Filter property to view a subset of the rows returned from the database, it s always better to retrieve only those rows you really want to process from the database.
The Sort property is essentially the same as the SQL Select statement s Order By clause. Simply assign a list of column names followed by an optional Asc keyword or a Desc keyword and then a comma, and ADO will sort the rows in the Recordset and return them to your program in the desired order. You can access each individual column through the Fields collection. You can extract the current value for the column through a Field object as well as by saving a new value into the column in the current row. Changing any of the values forces the EditMode property to change from adEditNone to adEditInProgress. Once you are finished making changes, you should call the Update method to save the changes to the database. The first step in writing data to a table is to make sure the EditMode property is set to adEditAdd. Then you can use the AddNew method to insert a blank row at the end of the recordset, into which you can write each column s value using the values in the Fields collec tion. Finally, you use the Update method to save the changes to the database.
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