Available in versions: Dev (3.20) | Latest (3.19) | 3.18 | 3.17 | 3.16

ST_IsClosed

Applies to ❌ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

This predicate checks if a linestring has the same start point and end point. For example:

create.select(
  field(stIsClosed(stGeomFromText("LINESTRING (-3 -1, -1 -1, -3 1, -3 -1)"))),
  field(stIsClosed(stGeomFromText("LINESTRING (3 1, 1 1, 3 -1)")))
).fetch();

The result being, for example

+-------------+-------------+
| ST_IsClosed | ST_IsClosed |
+-------------+-------------+
| true        | false       |
+-------------+-------------+

Or, visually:






Dialect support

This example using jOOQ:

stIsClosed(geometry)

Translates to the following dialect specific expressions:

Aurora MySQL, Aurora Postgres, CockroachDB, MariaDB, MySQL, Oracle, Postgres, Redshift, Snowflake

st_isclosed(geometry)

SQLServer

geometry.STIsClosed() = 1

ASE, Access, BigQuery, DB2, Derby, DuckDB, Exasol, Firebird, H2, HSQLDB, Hana, Informix, MemSQL, SQLDataWarehouse, SQLite, Sybase, Teradata, Trino, Vertica, YugabyteDB

/* UNSUPPORTED */

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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