ADO Programme's Reference

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Sample text

Parameter Object A Parameter object represents a parameter or argument associated with a Command object based on a parameterized query or stored procedure. Remarks Many providers support parameterized commands. These are commands where the desired action is defined once, but variables (or parameters) are used to alter some details of the command. For example, an SQL SELECT statement could use a parameter to define the matching criteria of a WHERE clause, and another to define the column name for a SORT BY clause.

Columns of a shaped Recordset may contain data from a data provider such as SQL Server, references to another Recordset, values derived from a calculation on a single row of a Recordset, values derived from an operation over a column of an entire Recordset; or they may be a newly fabricated, empty column. 32 Data Shaping Data Shaping 33 When you retrieve the value of a column which contains a reference to another Recordset, ADO automatically returns the actual Recordset represented by the reference.

For example, in Microsoft Visual Basic, the occurrence of an ADO-specific error will trigger an On Error event and appear in the Err object. For a complete list of ADO errors, see the ADO Error Codes topic. You can read an Error object s properties to obtain specific details about each error, including the following: • The Description property, which contains the text of the error. • The Number property, which contains the Long integer value of the error constant. • The Source property, which identifies the object that raised the error.

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