Sqlite3如何在不读取所有行的情况下获取表中的行数？

Question

Can some shed some light on hoe to get the number of rows (using php) in a table without actually having to read all the rows? I am using squlite to log data periodically and need to know the table row count before I actually access specific data?

Apart from reading all rows and incrementing a counter, I cannot seem to work out how to do this quickly (it's a large database) rather simple requirement? I have tried the following php code but it only returns a boolean response rather that the actual number of rows?

$result = $db->query('SELECT count(*) FROM mdata');

Normally the SELECT statement will also return the data object (if there is any?)

Answer 1

Just use

LIMIT 1

That should work!! It Limits the result to ONLY look at 1 row!!

Answer 2

如果您有记录集，则可以通过mysql_num_rows（#Record Set＃）获得编号或记录。