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sp_OAGetProperty (Transact-SQL)

  • Straipsnis

Applies to: SQL Server

Gets a property value of an OLE object.

Transact-SQL syntax conventions

Syntax

sp_OAGetProperty objecttoken , propertyname
    [ , propertyvalue OUTPUT ]
    [ , index... ]
[ ; ]

Arguments

objecttoken

The object token of an OLE object that was previously created by using sp_OACreate.

propertyname

The property name of the OLE object to return.

propertyvalue OUTPUT

The returned property value. If specified, it must be a local variable of the appropriate data type.

If the property returns an OLE object, propertyvalue must be a local variable of data type int. An object token is stored in the local variable, and this object token can be used with other OLE Automation stored procedures.

If the property returns a single value, either:

  • specify a local variable for propertyvalue, which returns the property value in the local variable; or
  • don't specify propertyvalue, which returns the property value to the client as a single-column, single-row result set.

When the property returns an array, if propertyvalue is specified, it's set to NULL.

If propertyvalue is specified, but the property doesn't return a value, an error occurs. If the property returns an array with more than two dimensions, an error occurs.

index

An index parameter. If specified, index must be a value of the appropriate data type.

Some properties have parameters. These properties are called indexed properties, and the parameters are called index parameters. A property can have multiple index parameters.

Note

The parameters for this stored procedure are specified by position, not name.

Return code values

0 (success) or a nonzero number (failure) that is the integer value of the HRESULT returned by the OLE Automation object.

For more information about HRESULT return codes, see OLE automation return codes and error information.

Result set

If the property returns an array with one or two dimensions, the array is returned to the client as a result set:

  • A one-dimensional array is returned to the client as a single-row result set with as many columns as there are elements in the array. In other words, the array is returned as columns.

  • A two-dimensional array is returned to the client as a result set with as many columns as there are elements in the first dimension of the array and with as many rows as there are elements in the second dimension of the array. In other words, the array is returned as (columns, rows).

When a property return value or method return value is an array, sp_OAGetProperty or sp_OAMethod returns a result set to the client. (Method output parameters can't be arrays.) These procedures scan all the data values in the array to determine the appropriate SQL Server data types and data lengths to use for each column in the result set. For a particular column, these procedures use the data type and length required to represent all data values in that column.

When all data values in a column share the same data type, that data type is used for the whole column. When data values in a column are of different data types, the data type of the whole column is chosen based on the following chart.

int float money datetime varchar nvarchar
int int float money varchar varchar nvarchar
float float float money varchar varchar nvarchar
money money money money varchar varchar nvarchar
datetime varchar varchar varchar datetime varchar nvarchar
varchar varchar varchar varchar varchar varchar nvarchar
nvarchar nvarchar nvarchar nvarchar nvarchar nvarchar nvarchar

Remarks

You can also use sp_OAMethod to get a property value.

Permissions

Requires membership in the sysadmin fixed server role or execute permission directly on this stored procedure. The Ole Automation Procedures server configuration option must be enabled to use any system procedure related to OLE Automation.

Examples

A. Use a local variable

The following example gets the HostName property (of the previously created SQLServer object) and stores it in a local variable.

DECLARE @property VARCHAR(255);

EXEC @hr = sp_OAGetProperty @object,
    'HostName',
    @property OUTPUT;

IF @hr <> 0
BEGIN
    EXEC sp_OAGetErrorInfo @object

    RETURN
END

PRINT @property;

B. Use a result set

The following example gets the HostName property (of the previously created SQLServer object) and returns it to the client as a result set.

EXEC @hr = sp_OAGetProperty @object,
    'HostName';

IF @hr <> 0
BEGIN
    EXEC sp_OAGetErrorInfo @object

    RETURN
END;

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