Package osgeo :: Module ogr :: Class DataSource |
[hide private]
[frames] | no frames]

# Class DataSource

source code

Proxy of C++ OGRDataSourceShadow class.

Instance Methods | [hide private]
__init__(self, *args, **kwargs) | source code
__repr__(self) | source code
GetRefCount(self, *args) GetRefCount(DataSource self) -> int | source code
GetSummaryRefCount(self, *args) GetSummaryRefCount(DataSource self) -> int | source code
GetLayerCount(self, *args) GetLayerCount(DataSource self) -> int | source code
GetDriver(self, *args) GetDriver(DataSource self) -> Driver | source code
GetName(self, *args) GetName(DataSource self) -> char const * | source code
SyncToDisk(self, *args) SyncToDisk(DataSource self) -> OGRErr | source code
FlushCache(self, *args) FlushCache(DataSource self) | source code
CreateLayer(self, *args, **kwargs) CreateLayer(DataSource self, char const * name, SpatialReference srs=None, OGRwkbGeometryType geom_type, char ** options=None) -> Layer | source code
CopyLayer(self, *args, **kwargs) CopyLayer(DataSource self, Layer src_layer, char const * new_name, char ** options=None) -> Layer | source code
GetLayerByIndex(self, *args) GetLayerByIndex(DataSource self, int index=0) -> Layer | source code
GetLayerByName(self, *args) GetLayerByName(DataSource self, char const * layer_name) -> Layer | source code
TestCapability(self, *args) TestCapability(DataSource self, char const * cap) -> bool | source code
ExecuteSQL(self, *args, **kwargs) ExecuteSQL(DataSource self, char const * statement, Geometry spatialFilter=None, char const * dialect) -> Layer | source code
AbortSQL(self, *args) AbortSQL(DataSource self) -> OGRErr | source code
ReleaseResultSet(self, *args) ReleaseResultSet(DataSource self, Layer layer) | source code
GetStyleTable(self, *args) GetStyleTable(DataSource self) -> StyleTable | source code
SetStyleTable(self, *args) SetStyleTable(DataSource self, StyleTable table) | source code
StartTransaction(self, *args, **kwargs) StartTransaction(DataSource self, int force=False) -> OGRErr | source code
CommitTransaction(self, *args) CommitTransaction(DataSource self) -> OGRErr | source code
RollbackTransaction(self, *args) RollbackTransaction(DataSource self) -> OGRErr | source code
Destroy(self) Once called, self has effectively been destroyed. | source code
Release(self) Once called, self has effectively been destroyed. | source code
Reference(self) For backwards compatibility only. | source code
Dereference(self) For backwards compatibility only. | source code
__len__(self) Returns the number of layers on the datasource | source code
__getitem__(self, value) Support dictionary, list, and slice -like access to the datasource. | source code
GetLayer(self, iLayer=0) Return the layer given an index or a name | source code
DeleteLayer(self, value) Deletes the layer given an index or layer name | source code
Inherited from `MajorObject`: `GetDescription`, `GetMetadata`, `GetMetadataDomainList`, `GetMetadataItem`, `GetMetadata_Dict`, `GetMetadata_List`, `SetDescription`, `SetMetadata`, `SetMetadataItem`

Class Variables | [hide private]
| __swig_setmethods__ = `{}`
| __setattr__ = `lambda self, name, value:`
| __swig_getmethods__ = `{}`
| __getattr__ = `lambda self, name:`
| name = `_swig_property(_ogr.DataSource_name_get)`
| __swig_destroy__ = `_ogr.delete_DataSource`
| __del__ = `lambda self:`

Method Details | [hide private]

### __init__(self, *args, **kwargs) (Constructor) | source code
Overrides: MajorObject.__init__

### __repr__(self) (Representation operator) | source code
Overrides: _swig_repr

### GetRefCount(self, *args) | source code
GetRefCount(DataSource self) -> int int OGR_DS_GetRefCount(OGRDataSourceH hDataSource)

### GetSummaryRefCount(self, *args) | source code
GetSummaryRefCount(DataSource self) -> int int OGR_DS_GetSummaryRefCount(OGRDataSourceH hDataSource)

### GetLayerCount(self, *args) | source code
    GetLayerCount(DataSource self) -> int

    int
    OGR_DS_GetLayerCount(OGRDataSourceH hDS)

    Get the number of layers in this data source.

    Deprecated Use GDALDatasetGetLayerCount() in GDAL 2.0

    Parameters:
    -----------

    hDS:  handle to the data source from which to get the number of
    layers.

    layer count.

### GetDriver(self, *args) | source code
    GetDriver(DataSource self) -> Driver

    OGRSFDriverH
    OGR_DS_GetDriver(OGRDataSourceH hDS)

    Returns the driver that the dataset was opened with.

    NOTE: Starting with GDAL 2.0, it is NOT safe to cast the returned
    handle to OGRSFDriver*. If a C++ object is needed, the handle should
    be cast to GDALDriver*.

    Deprecated Use GDALGetDatasetDriver() in GDAL 2.0

    Parameters:
    -----------

    hDS:  handle to the datasource

    NULL if driver info is not available, or pointer to a driver owned by
    the OGRSFDriverManager.

### GetName(self, *args) | source code
    GetName(DataSource self) -> char const *

    const char*
    OGR_DS_GetName(OGRDataSourceH hDS)

    Returns the name of the data source.

    This string should be sufficient to open the data source if passed to
    the same OGRSFDriver that this data source was opened with, but it
    need not be exactly the same string that was used to open the data
    source. Normally this is a filename.

    Deprecated Use GDALGetDescription() in GDAL 2.0

    Parameters:
    -----------

    hDS:  handle to the data source to get the name from.

    pointer to an internal name string which should not be modified or
    freed by the caller.

### SyncToDisk(self, *args) | source code
SyncToDisk(DataSource self) -> OGRErr OGRErr OGR_DS_SyncToDisk(OGRDataSourceH hDS) Flush pending changes to disk. See GDALDataset::FlushCache()

### CreateLayer(self, *args, **kwargs) | source code
    CreateLayer(DataSource self, char const * name, SpatialReference srs=None, OGRwkbGeometryType geom_type, char ** options=None) -> Layer

    OGRLayerH
    OGR_DS_CreateLayer(OGRDataSourceH hDS, const char *pszName,
    OGRSpatialReferenceH hSpatialRef, OGRwkbGeometryType eType, char
    **papszOptions)

    This function attempts to create a new layer on the data source with
    the indicated name, coordinate system, geometry type.

    The papszOptions argument can be used to control driver specific
    creation options. These options are normally documented in the format
    specific documentation.

    Deprecated Use GDALDatasetCreateLayer() in GDAL 2.0

    Parameters:
    -----------

    hDS:  The dataset handle.

    pszName:  the name for the new layer. This should ideally not match
    any existing layer on the datasource.

    hSpatialRef:  handle to the coordinate system to use for the new
    layer, or NULL if no coordinate system is available. The driver might
    only increase the reference counter of the object to take ownership,
    and not make a full copy, so do not use OSRDestroySpatialReference(),
    but OSRRelease() instead when you are done with the object.

    eType:  the geometry type for the layer. Use wkbUnknown if there are
    no constraints on the types geometry to be written.

    papszOptions:  a StringList of name=value options. Options are driver
    specific, and driver information can be found at the following
    url:http://www.gdal.org/ogr_formats.html

    NULL is returned on failure, or a new OGRLayer handle on success.
    Example:

### CopyLayer(self, *args, **kwargs) | source code
    CopyLayer(DataSource self, Layer src_layer, char const * new_name, char ** options=None) -> Layer

    OGRLayerH
    OGR_DS_CopyLayer(OGRDataSourceH hDS, OGRLayerH hSrcLayer, const char
    *pszNewName, char **papszOptions)

    Duplicate an existing layer.

    This function creates a new layer, duplicate the field definitions of
    the source layer and then duplicate each features of the source layer.
    The papszOptions argument can be used to control driver specific
    creation options. These options are normally documented in the format
    specific documentation. The source layer may come from another
    dataset.

    Deprecated Use GDALDatasetCopyLayer() in GDAL 2.0

    Parameters:
    -----------

    hDS:  handle to the data source where to create the new layer

    hSrcLayer:  handle to the source layer.

    pszNewName:  the name of the layer to create.

    papszOptions:  a StringList of name=value options. Options are driver
    specific.

    a handle to the layer, or NULL if an error occurs.

### GetLayerByName(self, *args) | source code
    GetLayerByName(DataSource self, char const * layer_name) -> Layer

    OGRLayerH
    OGR_DS_GetLayerByName(OGRDataSourceH hDS, const char *pszLayerName)

    Fetch a layer by name.

    The returned layer remains owned by the OGRDataSource and should not
    be deleted by the application.

    Deprecated Use GDALDatasetGetLayerByName() in GDAL 2.0

    Parameters:
    -----------

    hDS:  handle to the data source from which to get the layer.

    pszLayerName:  Layer the layer name of the layer to fetch.

    a handle to the layer, or NULL if the layer is not found or an error
    occurs.

### TestCapability(self, *args) | source code
    TestCapability(DataSource self, char const * cap) -> bool

    int
    OGR_DS_TestCapability(OGRDataSourceH hDS, const char *pszCapability)

    Test if capability is available.

    One of the following data source capability names can be passed into
    this function, and a TRUE or FALSE value will be returned indicating
    whether or not the capability is available for this object.

    ODsCCreateLayer: True if this datasource can create new layers.

    ODsCDeleteLayer: True if this datasource can delete existing layers.

    ODsCCreateGeomFieldAfterCreateLayer: True if the layers of this
    datasource support CreateGeomField() just after layer creation.

    ODsCCurveGeometries: True if this datasource supports writing curve
    geometries. (GDAL 2.0). In that case, OLCCurveGeometries must also be
    declared in layers of that dataset.

    The #define macro forms of the capability names should be used in
    preference to the strings themselves to avoid misspelling.

    Deprecated Use GDALDatasetTestCapability() in GDAL 2.0

    Parameters:
    -----------

    hDS:  handle to the data source against which to test the capability.

    pszCapability:  the capability to test.

    TRUE if capability available otherwise FALSE.

### ExecuteSQL(self, *args, **kwargs) | source code
    ExecuteSQL(DataSource self, char const * statement, Geometry spatialFilter=None, char const * dialect) -> Layer

    OGRLayerH
    OGR_DS_ExecuteSQL(OGRDataSourceH hDS, const char *pszStatement,
    OGRGeometryH hSpatialFilter, const char *pszDialect)

    Execute an SQL statement against the data store.

    The result of an SQL query is either NULL for statements that are in
    error, or that have no results set, or an OGRLayer handle representing
    a results set from the query. Note that this OGRLayer is in addition
    to the layers in the data store and must be destroyed with
    OGR_DS_ReleaseResultSet() before the data source is closed
    (destroyed).

    For more information on the SQL dialect supported internally by OGR
    review theOGR SQL document. Some drivers (i.e. Oracle and PostGIS)
    pass the SQL directly through to the underlying RDBMS.

    TheSQLITE dialect can also be used.

    Deprecated Use GDALDatasetExecuteSQL() in GDAL 2.0

    Parameters:
    -----------

    hDS:  handle to the data source on which the SQL query is executed.

    pszStatement:  the SQL statement to execute.

    hSpatialFilter:  handle to a geometry which represents a spatial
    filter. Can be NULL.

    pszDialect:  allows control of the statement dialect. If set to NULL,
    the OGR SQL engine will be used, except for RDBMS drivers that will
    use their dedicated SQL engine, unless OGRSQL is explicitly passed as
    the dialect. The SQLITE dialect can also be used.

    a handle to a OGRLayer containing the results of the query. Deallocate
    with OGR_DS_ReleaseResultSet().

### ReleaseResultSet(self, *args) | source code
    ReleaseResultSet(DataSource self, Layer layer)

    void
    OGR_DS_ReleaseResultSet(OGRDataSourceH hDS, OGRLayerH hLayer)

    Release results of OGR_DS_ExecuteSQL().

    This function should only be used to deallocate OGRLayers resulting
    from an OGR_DS_ExecuteSQL() call on the same OGRDataSource. Failure to
    deallocate a results set before destroying the OGRDataSource may cause
    errors.

    Deprecated Use GDALDatasetReleaseResultSet() in GDAL 2.0

    Parameters:
    -----------

    hDS:  a handle to the data source on which was executed an SQL query.

    hLayer:  handle to the result of a previous OGR_DS_ExecuteSQL() call.

### GetStyleTable(self, *args) | source code
GetStyleTable(DataSource self) -> StyleTable OGRStyleTableH OGR_DS_GetStyleTable(OGRDataSourceH hDS) Get style table.

### SetStyleTable(self, *args) | source code
SetStyleTable(DataSource self, StyleTable table) void OGR_DS_SetStyleTable(OGRDataSourceH hDS, OGRStyleTableH hStyleTable) Set style table.

### Destroy(self) | source code
Once called, self has effectively been destroyed. Do not access. For backwards compatibility only

### Release(self) | source code
Once called, self has effectively been destroyed. Do not access. For backwards compatibility only

### __getitem__(self, value) (Indexing operator) | source code
Support dictionary, list, and slice -like access to the datasource. ds[0] would return the first layer on the datasource. ds['aname'] would return the layer named "aname". ds[0:4] would return a list of the first four layers.