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The mysql transaction rollback is invalid.

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IGNOREDELETES, IGNOREUPDATES, ignoredeletes

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[MongoDB] The high query operation of MongoDB (III), mongodboperation1, Sort Needless to say, mongodb also support to sort data. THe positive one means sorting by asc order and negetive means by desc. 2. Group The grammar of group: Description Of

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[Mongo] group by time (formatted by time), mongo GroupThe Group key can use the original field or a function to format the date. /* 0 */{ "_id" : ObjectId("541fcc51c6c36038bc6b81cd"), "url" : "http://wifi21.com/", "addtime" :

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Chapter 2 User Authentication, Authorization, and Security (10): Create a database that contains, authentication

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