如何计算不规则图形周长

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select * from tbl_Articles WHERE ArticleID=2351595 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2351595 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2351595 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1126620,2429910,1069935,121537,2805308,2075053,1406249,616408,276675,370219,2025045,1410511,349914,2688922,1041499,2462620,2693656,1123835,1054832,515499,2416559,1068262,490367,437355,3246299,1067543,1129029,123051,353651,2777061) ORDER BY field (ArticleID,1126620,2429910,1069935,121537,2805308,2075053,1406249,616408,276675,370219,2025045,1410511,349914,2688922,1041499,2462620,2693656,1123835,1054832,515499,2416559,1068262,490367,437355,3246299,1067543,1129029,123051,353651,2777061)