cad如何算多条线段长度

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select * from tbl_Articles WHERE ArticleID=239553 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=239553 LIMIT 0,1
select * from tbl_Articles_sphinx where id=239553 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1120819,645994,202028,1088484,1563178,659934,1067729,404220,1433786,1775282,305724,1073017,2156130,2053859,901464,1084047,1126995,150989,850241,371332,2685235,1079606,2252414,1084633,1839404,1113724,2183936,1048376,357144,1277430) ORDER BY field (ArticleID,1120819,645994,202028,1088484,1563178,659934,1067729,404220,1433786,1775282,305724,1073017,2156130,2053859,901464,1084047,1126995,150989,850241,371332,2685235,1079606,2252414,1084633,1839404,1113724,2183936,1048376,357144,1277430)