Where to apply for ObjectGroup on an object persist with a table structure? Level line or set of table?

Hi, expert,

We have a class like this structure to store a table like structure in the persistent store:

class {} table

Vector lines; vector line, each line is another vector for the columns.

PrimaryKeyMaps Hashtable;

String tableName;

}

We know that we should use ObjectGroup to save persisent object handle. Right now, I use the group for each line vector object (all columns in a row are grouped). If each line would consume only a handful of persistent object. I guess I should group the primaryKeyMaps as well. However I wonder if I need to group them at the level of the entire table or not, because if there are 50 rows to the table, I would use 50 handler object persistent for all these lines. Managers how persisetent demand would be reasonably use in general? What is a good balance between performance and keeping the persistent object handles?

I use a very similar structure to store Tables in PersistentStore, and I grouped by row (I do not use Group objects, I essentially to serialize the row)... But that's all.  And I have a large number of lines in a number of tables, certainly more than 10,000 usually.  Works very well.

Persistent used to be a big problem, but I think you'll find that it isn't now, so unless you are targeting devices used (pre OS 4.6), or you have more than 10 s of thousands of lines, then I think that the structure, you are currently to assistance is therefore probably good enough.  And if you become big, you should probably move the data to SQLite.

I'm a little concerned by the hash table you mind, I have not this and it is more than double the number of persistent Handles because you have an object for the key and the value.  have you looked to optimize this, perhaps using an intHashTable to kill using object?

But if you are looking for where you will not store 10s of thousands and thousands of lines, I think what you do is very well.

Tags: BlackBerry Developers

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