mongodb - 通过 C# 驱动程序执行 mongodb shell 脚本

Question

我已阅读 this问，没看懂。是否可以通过 C# 驱动程序执行任意 mongodb shell 脚本？

Answer 1

var mongoServer = MongoServer.Create("mongodb://<connectionstring>"); 
var database = mongoServer.GetDatabase("mydatabase"); 
string mycollectionCount database.Eval("function() { return db.mycollection.count(); }").ToString();

当您尝试更改属性类型时，这很有用，例如:

string updateScript = @"
function () { 
    db.some_items.find().forEach(function(documentItem) {
        documentItem.some_collection.forEach(function(collectionItem) {
            if (typeof collectionItem.SomeProperty === 'number' 
                && Math.floor(collectionItem.someProperty) === collectionItem.someProperty)
            {
                collectionItem.someProperty = '' + collectionItem.someProperty;
            }
        });
        db.modules_elementary.save(documentItem);
    });

    return true;
}";
var updateResult = MongoReadDatabase.Database.Eval(updateScript).ToString();
if (updateResult != "true")
{
    throw new ApplicationException("Update of something failed");
}

此代码更改 someProperty 的类型这是集合的集合的元素:

some_items mongo collection:

{
   some_collection: [{ someProperty: 12, ....}],
   ....

}