mysql found_row()使用详解

For a SELECT with a LIMIT clause, the number of rows that would be returned were there no LIMIT clause
A SELECT statement may include a LIMIT clause to restrict the number of rows the server returns to the client. In some cases, it is desirable to know how many rows the statement would have returned without the LIMIT, but without running the statement again. To obtain this row count, include a SQL_CALC_FOUND_ROWS option in the SELECT statement, and then invoke FOUND_ROWS() afterward:

SELECT SQL_CALC_FOUND_ROWS * FROM tbl_name
WHERE id > 100 LIMIT 10;

SELECT FOUND_ROWS();

select sql_calc_found_rows * from actionlist where A_ID > 0 limit 10;
select FOUND_ROWS();