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Information Schema GEOMETRY_COLUMNS Table

MariaDB starting with 10.1.2

The GEOMETRY_COLUMNS table was introduced in MariaDB 10.1.2

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

Information Schema GEOMETRY_COLUMNS Table

Description

Storage_type

Example

See also