弧长的计算公式

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select * from tbl_Articles WHERE ArticleID=984429 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=984429 LIMIT 0,1
select * from tbl_Articles_sphinx where id=984429 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3497997,1085552,3172040,2604841,360642,1119694,3131113,364648,100725,2079076,86107,358755,361261,362103,463521,573064,1356366,86727,1880098,1105615,363675,101125,1113816,515786,739465,359768,86798,777882,1108854,3316132) ORDER BY field (ArticleID,3497997,1085552,3172040,2604841,360642,1119694,3131113,364648,100725,2079076,86107,358755,361261,362103,463521,573064,1356366,86727,1880098,1105615,363675,101125,1113816,515786,739465,359768,86798,777882,1108854,3316132)