將座標插入到MySQL中 - PolyFromText SQL語法錯誤/返回null

Question

我試圖在我的MySQL數據庫中插入一個多邊形的地理座標。我有一個名爲類型的多邊形多邊形領域，我已經試過所有運行這些查詢，但繼續獲得SQL語法錯誤：

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)); 

上次查詢是使用phpmyadmins自己的地理空間工具生成的，並返回「Column」多邊形「不能爲null」。任何幫助表示讚賞！

Answer 1

原因是因爲null退出最後一點不等於第一個點，是符合OSGeo標準WKT的條件，在某些實現中這是允許的，但是mysql對它是嚴格的，在SQL Server中文檔更好地解釋條件。

看到這個

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的文檔

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