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 -- ACCESS, ASE, BIGQUERY, DB2, DERBY, DUCKDB, EXASOL, FIREBIRD, H2, HANA, HSQLDB, INFORMIX, MEMSQL, SQLDATAWAREHOUSE, -- SQLITE, SYBASE, TERADATA, TRINO, VERTICA, YUGABYTEDB /* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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