返回指定Geometry對(duì)象的HEXEWKB表示字符串。
語(yǔ)法
text ST_AsHEXEWKB(geometry g1 , text NDRorXDR);
text ST_AsHEXEWKB(geometry g1);
參數(shù)
參數(shù)名稱 | 描述 |
---|---|
g1 | 目標(biāo)Geometry對(duì)象。 |
NDRorXDR | Little endian/Big endian,機(jī)器字節(jié)序。使用大端在前還是小端在前,默認(rèn)使用小端在前。
|
描述
- 該函數(shù)支持Circular Strings和Curves。
- 該函數(shù)支持3D對(duì)象,并且不會(huì)丟棄Geometry對(duì)象的z-index。
示例
SELECT ST_AsHEXEWKB(ST_GeomFromText('POLYGON((1 1,1 2,2 2,2 1,1 1))',4326));
st_ashexewkb
---------------------------------------------------------------
0103000020E61000000100000005000000000000000000F03F00000000000.
.0F03F000000000000F03F0000000000000040000000000000004000000000.
.000000400000000000000040000000000000F03F000000000000F03F00000.
.0000000F03F
(1 row)