5）$pushAll

用法：{$push:{field:value_array}},用法同$push一样，只是$pushAll一次可以追加多个值到一个数组字段内

更新前：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "liangzhangping", "lzp", "xiaoping" ], "userid" : 3 }

操作：db.t3.update({"userid":3},{$pushAll:{name:["N1","N2"]}})

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "liangzhangping", "lzp", "xiaoping", "N1", "N2" ], "userid" : 3 }

6）$addToSet www.2cto.com

用法：{$addToSet:{field:value}},加一个值到数组内，而且只有当这个值不在数组内才增加

更新前：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "liangzhangping", "lzp", "xiaoping", "N1", "N2" ], "userid" : 3 }

操作：db.t3.update({"userid":3},{$addToSet:{name:"N1"}})

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "liangzhangping", "lzp", "xiaoping", "N1", "N2" ], "userid" : 3 }

7）$pop

用法：{$pop:{field:[1,-1]}},删除数组内的一个值，-1：删除第一个，1：删除最后一个

更新前：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "liangzhangping", "lzp", "xiaoping", "N1", "N2" ], "userid" : 3 }

操作：db.t3.update({"userid":3},{$pop:{name:-1}})

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "lzp", "xiaoping", "N1", "N2" ], "userid" : 3 }

操作：db.t3.update({"userid":3},{$pop:{name:1}})

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "lzp", "xiaoping", "N1" ], "userid" : 3 }

8）$pull

用法：{$pull:{field:value}},从数组filed内删除一个等于value的值

更新前：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "lzp", "xiaoping", "N1" ], "userid" : 3 }

操作：db.t3.update({"userid":3},{$pull:{name:"N1"}})

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "lzp", "xiaoping" ], "userid" : 3 }

9）$pullAll

用法：{$pullAll:{field:value_array}},用法同$pull一样，可以一次删除数组内的多个值 www.2cto.com

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ "lzp", "xiaoping" ], "userid" : 3 }

操作：db.t3.update({"userid":3},{$pullAll:{name:["lzp", "xiaoping"]}})

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ ], "userid" : 3 }

10）$rename

用法：{$rename:{old_field_name:new_field_name}},完成字段的重命名

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "name" : [ ], "userid" : 3 }

操作：db.t3.update({"userid":3},{$rename:{name:"alias"}})

更新后：{ "_id" : ObjectId("4fe098f08a6e072b231ca5ca"), "alias" : [ ], "userid" : 3 }

作者 xiaoping8411