如何使用C ++驱动程序在mongodb中设置TTL

Question

I want to set TTL index with C++ process in Linux.

But I've found the ensureIndex is removed. ( https://github.com/mongodb/mongo-cxx-driver/pull/106 )

The argument of createIndex seems only BSONObj can input.

I've tried:

mongo::DBClientConnection mConnection;
mConnection.connect("localhost");
mongo::BSONObj bObj = BSON( "mongo_date"<< 1 << "expireAfterSeconds" << 10);
mConnection.createIndex("Test.Data",bObj)

but the result is:

db.system.indexes.find()

{ "v" : 1, "key" : { "_id" : 1 }, "name" : "_id_", "ns" : "Test.Data" }

{ "v" : 1, "key" : { "mongo_date" : 1, "expireAfterSeconds" : 10 }, "name" : "mongo_date_1_expireAfterSeconds_10", "ns" : "Test.Data" }

Is there something wrong or other way to set the TTL?

Thanks.

Answer 1

Because I still can't find the method in C, so I use a stupid method temporarily.

I use shell script to create and run a JavaScript

In C code:

int expire = 321;
char expir_char[20];
sprintf(expir_char, "%d",expire);
char temp_char[30] = "./runTtlJs.sh ";
strcat(temp_char,expir_char);
system(temp_char);

In runTtlJs.sh:

echo "db.Data.dropIndex({"mongo_date":1})" > ttl.js
echo "db.Data.ensureIndex({"mongo_date":1}, { expireAfterSeconds: $1 })" >> ttl.js
mongo Test ttl.js

I know it's really not a good answer.