将坐标插入到MySQL中 - PolyFromText SQL语法错误/返回null

Question

我试图在我的MySQL数据库中插入一个多边形的地理坐标。我有一个名为类型的多边形多边形领域，我已经试过所有运行这些查询，但继续获得SQL语法错误：

SET @g = 'POLYGON((-74.13591384887695 40.93750722242824,-74.13522720336914 40.929726129575016,-74.15102005004883 40.9329683629703,-74.14329528808594 40.94256444133327))'; 
INSERT INTO 'zones' ('polygon') VALUES (PolyFromText(@g)); 

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INSERT INTO 'zones' ('polygon') VALUES (PolyFromText('POLYGON((-74.13591384887695 40.93750722242824,-74.13522720336914 40.929726129575016,-74.15102005004883 40.9329683629703,-74.14329528808594 40.94256444133327))')); 

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INSERT INTO 'zones' ('polygon') VALUES (PolyFromText('POLYGON((-74.13591384887695 40.93750722242824,-74.13522720336914 40.929726129575016,-74.15102005004883 40.9329683629703,-74.14329528808594 40.94256444133327))', 0)); 

上次查询是使用phpmyadmins自己的地理空间工具生成的，并返回“Column”多边形“不能为null”。任何帮助表示赞赏！

Answer 1

原因是因为null退出最后一点不等于第一个点，是符合OSGeo标准WKT的条件，在某些实现中这是允许的，但是mysql对它是严格的，在SQL Server中文档更好地解释条件。

看到这个

SELECT Dimension(GeomFromText('POLYGON((-74.13591384887695 40.93750722242824,-74.13522720336914 40.929726129575016,-74.15102005004883 40.9329683629703,-74.14329528808594 40.94256444133327,-74.13591384887695 40.93750722242824)))')); 

的mysql的文档

http://dev.mysql.com/doc/refman/5.0/en/gis-class-polygon.html

DOC SQLSERVER

http://msdn.microsoft.com/en-us/library/bb964739(v=sql.105).aspx