什么是网关什么情况下会用到网关

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select * from tbl_Articles WHERE ArticleID=2777395 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2777395 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2777395 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(980827,1073025,1094219,1089662,1009146,1084427,1070498,1095576,1060887,1077084,1113507,1103432,1124356,1102388,1062706,1108307,1015577,1055718,1303381,1072713,1119560,1068258,997640,1070270,997282,1106192,1073698,1116627,1109853,1102466) ORDER BY field (ArticleID,980827,1073025,1094219,1089662,1009146,1084427,1070498,1095576,1060887,1077084,1113507,1103432,1124356,1102388,1062706,1108307,1015577,1055718,1303381,1072713,1119560,1068258,997640,1070270,997282,1106192,1073698,1116627,1109853,1102466)