如何在iPhone的sqlite表中获取最后10条添加的记录

Question

I have table view in which I want to select last 10 records added in query. I am using following query which return all the records but I want last 10 added.

here is the query

NSString* select = [[NSString alloc] initWithFormat:@"select * FROM ContentMaster where ContentAddedByUserID='%@' AND HiveletCode='%@'",appDelegate.userID,appDelegate.organizationCode];

I have searched some where that we can get by top records like this I get that we can fetch using date between two dates any idea how to get without date last 10 records.

I want to fetch all data which is last 10 added.

Answer 1

Every row in a table has an unique ID , which you can use for your query:

SELECT
    *
FROM
    ContentMaster
WHERE
    ContentAddedByUserID='%@'
AND
    HiveletCode='%@'
ORDER BY
    rowid DESC
LIMIT 10

Answer 2

According to documentation , each row in the Sqlite contains a 64 Bit auto incremented id associated with it.
So you can use query as

SELECT * FROM ContentMaster WHERE ContentAddedByUserID='%@' AND HiveletCode='%@'
ORDER BY ROWID DESC
LIMIT 10

Remember,

1. If you declare an ordinary table column to use one of the defined special names ROWID, _ROWID_, or OID , then the use of that name will refer to the declared column not to the internal ROWID .
2. If a table contains a column of type INTEGER PRIMARY KEY, then that column becomes an alias for the ROWID .