ST_AsText,ST_AsWKT

将几何图形转换为 WKT（Well Known Text）格式。

语法

VARCHAR ST_AsText(GEOMETRY geo)

示例

MySQL > SELECT ST_AsText(ST_Point(24.7, 56.7));
+---------------------------------+
| st_astext(st_point(24.7, 56.7)) |
+---------------------------------+
| POINT (24.7 56.7)               |
+---------------------------------+

关键词

ST_ASTEXT,ST_ASWKT,ST,ASTEXT,ASWKT