mongodb remove

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db.集合名称.remove({query}, justOne)
query：过滤条件，可选
justOne：是否只删除查询到的第一条数据，值为true或者1时，只删除一条数据，默认为false，可选。

删除第一条

> db.student.remove({age:28}, true)WriteResult({ "nRemoved" : 1 })> db.student.find(){ "_id" : 2, "name" : "lisi", "age" : 28 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "mongodb", "java" ] }

删除所有的数据

> db.student.remove({age:28})WriteResult({ "nRemoved" : 2 })> db.student.find(){ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "mongodb", "java" ] }

删除集合所有{}

> db.student.remove({})WriteResult({ "nRemoved" : 4 })

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