MySQL 5.6 Reference Manual Including MySQL NDB Cluster 7.3-7.4 Reference Guide
The functions listed in this section do not restrict their argument and accept a geometry value of any type.
ST_Dimension()
and
Dimension()
are synonyms. For
more information, see the description of
ST_Dimension()
.
ST_Envelope()
and
Envelope()
are synonyms. For
more information, see the description of
ST_Envelope()
.
ST_GeometryType()
and
GeometryType()
are synonyms.
For more information, see the description of
ST_GeometryType()
.
ST_IsEmpty()
and
IsEmpty()
are synonyms. For
more information, see the description of
ST_IsEmpty()
.
ST_IsSimple()
and
IsSimple()
are synonyms. For
more information, see the description of
ST_IsSimple()
.
ST_SRID()
and
SRID()
are synonyms. For more
information, see the description of
ST_SRID()
.
Returns the inherent dimension of the geometry value
g
, or NULL
if
the argument is NULL
. The dimension can
be −1, 0, 1, or 2. The meaning of these values is
given in Section 11.4.2.2, “Geometry Class”.
mysql> SELECT ST_Dimension(ST_GeomFromText('LineString(1 1,2 2)'));
+------------------------------------------------------+
| ST_Dimension(ST_GeomFromText('LineString(1 1,2 2)')) |
+------------------------------------------------------+
| 1 |
+------------------------------------------------------+
ST_Dimension()
and
Dimension()
are synonyms.
Returns the minimum bounding rectangle (MBR) for the
geometry value g
, or
NULL
if the argument is
NULL
. The result is returned as a
Polygon
value that is defined by the
corner points of the bounding box:
POLYGON((MINX MINY, MAXX MINY, MAXX MAXY, MINX MAXY, MINX MINY))
mysql> SELECT ST_AsText(ST_Envelope(ST_GeomFromText('LineString(1 1,2 2)')));
+----------------------------------------------------------------+
| ST_AsText(ST_Envelope(ST_GeomFromText('LineString(1 1,2 2)'))) |
+----------------------------------------------------------------+
| POLYGON((1 1,2 1,2 2,1 2,1 1)) |
+----------------------------------------------------------------+
ST_Envelope()
and
Envelope()
are synonyms.
Returns a binary string indicating the name of the geometry
type of which the geometry instance
g
is a member, or
NULL
if the argument is
NULL
. The name corresponds to one of the
instantiable Geometry
subclasses.
mysql> SELECT ST_GeometryType(ST_GeomFromText('POINT(1 1)'));
+------------------------------------------------+
| ST_GeometryType(ST_GeomFromText('POINT(1 1)')) |
+------------------------------------------------+
| POINT |
+------------------------------------------------+
ST_GeometryType()
and
GeometryType()
are synonyms.
This function is a placeholder that returns 0 for any valid
geometry value, 1 for any invalid geometry value, or
NULL
if the argument is
NULL
.
MySQL does not support GIS EMPTY
values
such as POINT EMPTY
.
ST_IsEmpty()
and
IsEmpty()
are synonyms.
Returns 1 if the geometry value g
has no anomalous geometric points, such as self-intersection
or self-tangency.
ST_IsSimple()
returns 0 if
the argument is not simple, and NULL
if
the argument is NULL
.
The descriptions of the instantiable geometric classes given under Section 11.4.2, “The OpenGIS Geometry Model” includes the specific conditions that cause class instances to be classified as not simple.
ST_IsSimple()
and
IsSimple()
are synonyms.
Returns an integer indicating the spatial reference system
ID associated with the geometry value
g
, or NULL
if
the argument is NULL
.
mysql> SELECT ST_SRID(ST_GeomFromText('LineString(1 1,2 2)',101));
+-----------------------------------------------------+
| ST_SRID(ST_GeomFromText('LineString(1 1,2 2)',101)) |
+-----------------------------------------------------+
| 101 |
+-----------------------------------------------------+