Information Schema GEOMETRY_COLUMNS Table
Description
The Information Schema GEOMETRY_COLUMNS table provides support for Spatial Reference systems for GIS data.
It contains the following columns:
| Column | Type | Null | Description |
|---|---|---|---|
F_TABLE_CATALOG | VARCHAR(512) | NO | Together with F_TABLE_SCHEMA and F_TABLE_NAME, the fully qualified name of the featured table containing the geometry column. |
F_TABLE_SCHEMA | VARCHAR(64) | NO | Together with F_TABLE_CATALOG and F_TABLE_NAME, the fully qualified name of the featured table containing the geometry column. |
F_TABLE_NAME | VARCHAR(64) | NO | Together with F_TABLE_CATALOG and F_TABLE_SCHEMA, the fully qualified name of the featured table containing the geometry column. |
F_GEOMETRY_COLUMN | VARCHAR(64) | NO | Name of the column in the featured table that is the geometry golumn. |
G_TABLE_CATALOG | VARCHAR(512) | NO | |
G_TABLE_SCHEMA | VARCHAR(64) | NO | Database name of the table implementing the geometry column. |
G_TABLE_NAME | VARCHAR(64) | NO | Table name that is implementing the geometry column. |
G_GEOMETRY_COLUMN | VARCHAR(64) | NO | |
STORAGE_TYPE | TINYINT(2) | NO | Binary geometry implementation. Always 1 in MariaDB. |
GEOMETRY_TYPE | INT(7) | NO | Integer reflecting the type of geometry stored in this column (see table below). |
COORD_DIMENSION | TINYINT(2) | NO | Number of dimensions in the spatial reference system. Always 2 in MariaDB. |
MAX_PPR | TINYINT(2) | NO | Always 0 in MariaDB. |
SRID | SMALLINT(5) | NO | ID of the Spatial Reference System used for the coordinate geometry in this table. It is a foreign key reference to the SPATIAL_REF_SYS table. |
Storage_type
The integers in the storage_type field match the geometry types as follows:
| Integer | Type |
|---|---|
| 0 | GEOMETRY |
| 1 | POINT |
| 3 | LINESTRING |
| 5 | POLYGON |
| 7 | MULTIPOINT |
| 9 | MULTILINESTRING |
| 11 | MULTIPOLYGON |
Example
CREATE TABLE g1(g GEOMETRY(9,4) REF_SYSTEM_ID=101);
SELECT * FROM information_schema.GEOMETRY_COLUMNS\G
*************************** 1. row ***************************
F_TABLE_CATALOG: def
F_TABLE_SCHEMA: test
F_TABLE_NAME: g1
F_GEOMETRY_COLUMN:
G_TABLE_CATALOG: def
G_TABLE_SCHEMA: test
G_TABLE_NAME: g1
G_GEOMETRY_COLUMN: g
STORAGE_TYPE: 1
GEOMETRY_TYPE: 0
COORD_DIMENSION: 2
MAX_PPR: 0
SRID: 101
See also
- The
SPATIAL_REF_SYStable.
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