什么是自锁如何实现自锁

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select * from tbl_Articles WHERE ArticleID=135477 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=135477 LIMIT 0,1
select * from tbl_Articles_sphinx where id=135477 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1083113,1109799,1052529,1051403,1091703,1106960,1103853,1041439,1107789,1072683,994629,1130518,1071041,1106192,1103532,1085458,1061282,1093769,1118495,1077984,1086762,1103070,982939,1063165,1098277,1005452,1108840,1077080,1096995,1126912) ORDER BY field (ArticleID,1083113,1109799,1052529,1051403,1091703,1106960,1103853,1041439,1107789,1072683,994629,1130518,1071041,1106192,1103532,1085458,1061282,1093769,1118495,1077984,1086762,1103070,982939,1063165,1098277,1005452,1108840,1077080,1096995,1126912)