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Append(Parameter) Count Delete(index) Item(index) Refresh
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The Parameters collection is essentially a normal collection object with two differences. The Append method is used to add a new Parameter object to the end of the collection. Depending on how the parameters are defined in the command, the order can be very important.
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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 The Refresh method populates the Parameters collection using the name of the stored proce dure from the CommandText property. This can be a useful shortcut that avoids the extra code to define all the parameters manually. Note Although you can use the Refresh method to get a copy of the parameters for a stored procedure directly from the database, you might not want to do this each time you call the stored procedure. There s a fair amount of overhead associated with retrieving the parameters from the database, which could add up if you re calling the stored procedure from within a loop.
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The Parameter object contains a number of properties that describe a specific parameter that is passed to a parameterized query or a stored procedure. (See Table 23-7.)
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Table 23-7.
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Key Properties of the Parameter Object
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Description
Indicates whether the parameter is an input (adParamInput), output (adParamOutput), or input/output (adParamInputOutput) parameter to the stored procedure. Contains the name of the parameter. Contains the number of digits to the right of the decimal point for a numeric field. Contains the total number of digits in a numeric field. Contains the data type associated with the parameter. Some common values are adSmallInt, adInteger, asSingle, adDouble, adCurrency, adDate, adBSTR, adBoolean, adDecimal, adBigInt, adBinary, adChar, adWChar, adNumeric, adDBDate, adDBTime, adVarNumeric, adVarChar, adLongVarChar, adVarWChar, adLongVarWChar, adVarBinary, and asLongVarBinary. Contains the value of the parameter. For input parameters and input/output parameters, this value will be passed to the stored procedure. For input/output and output parameters, this value is set after the stored procedure is executed.
Property
Direction
Name NumericScale Precision Type
Part 6: Excel and the Outside World: Collaborating Made Easy
23
Value
Each Parameter object describes a single parameter to a stored procedure. The Name prop erty must match the parameter name defined in the stored procedure. You must specify the database type associated with the parameter, along with which direction the value is passed. The Value property contains the value that s passed and/or returned from the stored proce dure. Typically, you define a Command object with all its associated parameters only once. Then you modify the set of Value properties so that you pass the appropriate information to the stored procedure. 490
Introducing ADO
The Recordset Object
When a database request returns rows to your program, they are made available through the Recordset object.
Key Properties and Methods of the Recordset Object
Table 23-8 lists some of the key properties and methods associated with the Recordset object.
Table 23-8.
Key Properties and Methods of the Recordset Object
Description
Property: points to an open Connection object that will be used to execute the command or contains a connection string that will be used to connect to the database. Method: adds a new row to the end of the Recordset. Property: returns True when the current record pointer is before the first record in the recordset. Method: restores the current row in the Recordset to its original values. Method: closes an open Recordset object and releases all its resources. Method: deletes the current record. Property: describes the edit status of the current record. Can be adEditNone (current record is unchanged), adEditInProgress (current record has been changed, but not saved), adEditAdd (the AddNew method created a new, empty record, which hasn t been saved yet), or adEditDelete (the current record is deleted). Property: returns True when the current record pointer is past the last row in the recordset.
23
Property/Method
ActiveConnection
AddNew BOF CancelUpdate Close Delete EditMode
EOF Fields Filter Move(NumRecords) MoveFirst MoveLast
Property: returns a Fields collection containing the set of fields associated with the current record. Property: can be a string containing an expression similar to an SQL Where clause. Method: moves the current record pointer forward (positive value) or backward (negative value) the specified number of rows. Method: moves the current record pointer to the first row in the Recordset. Method: moves the current record pointer to the last row in the Recordset.
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