Section: Visualization Toolkit IO Classes
Execute() - Execute the query. No results need to be retrieved at this point, unless you are performing caching.
GetNumberOfFields() - After Execute() is performed, returns the number of fields in the query results.
GetFieldName() - The name of the field at an index.
GetFieldType() - The data type of the field at an index.
NextRow() - Advances the query results by one row, and returns whether there are more rows left in the query.
DataValue() - Extract a single data value from the current row.
.SECTION Thanks Thanks to Andrew Wilson from Sandia National Laboratories for his work on the database classes.
To create an instance of class vtkRowQuery, simply invoke its constructor as follows
obj = vtkRowQuery
obj
is an instance of the vtkRowQuery class.
string = obj.GetClassName ()
int = obj.IsA (string name)
vtkRowQuery = obj.NewInstance ()
vtkRowQuery = obj.SafeDownCast (vtkObject o)
bool = obj.Execute ()
- Execute the query. This must be performed
before any field name or data access functions
are used.
int = obj.GetNumberOfFields ()
- The number of fields in the query result.
string = obj.GetFieldName (int i)
- Return the name of the specified query field.
int = obj.GetFieldType (int i)
- Return the type of the field, using the constants defined in vtkType.h.
int = obj.GetFieldIndex (string name)
- Return the index of the specified query field.
Uses GetNumberOfFields() and GetFieldName()
to match field name.
bool = obj.NextRow ()
- Advance row, return false if past end.
bool = obj.IsActive ()
- Return true if the query is active (i.e. execution was successful
and results are ready to be fetched). Returns false on error or
inactive query.
bool = obj.HasError ()
- Returns true if an error is set, otherwise false.
string = obj.GetLastErrorText ()
- Get the last error text from the query
obj.SetCaseSensitiveFieldNames (bool )
- Many databases do not preserve case in field names. This can
cause GetFieldIndex to fail if you search for a field named
someFieldName when the database actually stores it as
SOMEFIELDNAME. This ivar controls whether GetFieldIndex()
expects field names to be case-sensitive. The default is OFF,
i.e. case is not preserved.
bool = obj.GetCaseSensitiveFieldNames ()
- Many databases do not preserve case in field names. This can
cause GetFieldIndex to fail if you search for a field named
someFieldName when the database actually stores it as
SOMEFIELDNAME. This ivar controls whether GetFieldIndex()
expects field names to be case-sensitive. The default is OFF,
i.e. case is not preserved.
obj.CaseSensitiveFieldNamesOn ()
- Many databases do not preserve case in field names. This can
cause GetFieldIndex to fail if you search for a field named
someFieldName when the database actually stores it as
SOMEFIELDNAME. This ivar controls whether GetFieldIndex()
expects field names to be case-sensitive. The default is OFF,
i.e. case is not preserved.
obj.CaseSensitiveFieldNamesOff ()
- Many databases do not preserve case in field names. This can
cause GetFieldIndex to fail if you search for a field named
someFieldName when the database actually stores it as
SOMEFIELDNAME. This ivar controls whether GetFieldIndex()
expects field names to be case-sensitive. The default is OFF,
i.e. case is not preserved.