' Basic setup - Create a connection object to the SQL database We use this format all the time and it has the added benefit that it is easier (for me anyway!) to read and looks very similar to T-SQL. Little known fact - you can execute stored procedures with an Access VBA code command like the examples below. To execute each Command object, use separate connections or disconnect all other Command objects from the connection. If two or more Command objects are executed on the same connection and either Command object is a stored procedure with output parameters, an error occurs. If the Command has parameters, pass their values as arguments to the method. The Command must have its ActiveConnection property set to the Connection object. To execute a Command, simply call it by its Name property on the associated Connection object. If you do not set the Command object's ActiveConnection property to this object variable, ADO creates a new Connection object for each Command object, even if you use the same connection string. However, if you are associating multiple Command objects with the same connection, you should explicitly create and open a Connection object this assigns the Connection object to an object variable. ADO still creates a Connection object, but it doesn't assign that object to an object variable. To create a Command object independently of a previously defined Connection object, set its ActiveConnection property to a valid connection string. However, a Command object is required when you want to persist the command text and re-execute it, or use query parameters. ![]() To execute a query without using a Command object, pass a query string to the Execute method of a Connection object or to the Open method of a Recordset object. Pass a Command object to the Source property of a Recordset in order to obtain data.Īccess provider-specific attributes with the Properties collection. Set the Name property to identify the Command object as a method on the associated Connection object. Set the number of seconds that a provider will wait for a command to execute with the CommandTimeout property.Īssociate an open connection with a Command object by setting its ActiveConnection property. Specify the type of command with the CommandType property prior to execution to optimize performance.Ĭontrol whether the provider saves a prepared (or compiled) version of the command prior to execution with the Prepared property. With the collections, methods, and properties of a Command object, you can do the following:ĭefine the executable text of the command (for example, an SQL statement) with the CommandText property.ĭefine parameterized queries or stored-procedure arguments with Parameter objects and the Parameters collection.Įxecute a command and return a Recordset object if appropriate with the Execute method. Depending on the functionality of the provider, some Command collections, methods, or properties may generate an error when referenced. Use a Command object to query a database and return records in a Recordset object, to execute a bulk operation, or to manipulate the structure of a database.
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