Mysql result num_rows

Returns the number of rows in the result set. The behaviour of mysqli_num_rows () depends on whether buffered or unbuffered result sets are being used. If you use mysql_use_result (), mysql_num_rows () does not return the correct value until all the rows in the result set have been retrieved. For statements such as INSERT, UPDATE, or DELETE, the number of affected rows can be obtained with mysql _affected_rows().

Definition and Usage. The mysqli_num_rows() function returns the number of rows in a result set.

It is generally used to check if data is present in the database or not. Retrieves the number of rows from a result set. This command is only valid for statements like SELECT or SHOW that return an actual result set. To retrieve the number of rows affected by a INSERT, UPDATE, REPLACE or DELETE query, use mysql_affected_rows (). This code is licensed under Creative Commons (Public Domain) As of PHP 5. Alternative for mysql_num_rows using PDO.

Retorna el número de filas del resultado. En caso de emplearlos sin buffer mysqli_ num_rows () no retornará el número de filas correcto hasta que todas las filas del resultado hayan sido recuperadas.

Thanks for contributing an answer to Stack Overflow ! Please be sure to answer the question. Provide details and share your research! Asking for help, clarification, or responding to other. Without a parameter in fetchColumn you will get the first column of the selected row. Perfect, that’s exactly what I was looking for.

You saved my day, thanks! The mysqli_ num _ rows () function is an inbuilt function in PHP which is used to return the number of rows present in the result set. For unbuffered result sets, mysqli_ num_rows () will not return the correct number of rows until all the rows in the result have been retrieved.

Finding total number of rows in a table We can get the number of rows or records present in a table by using mysql _ num _ rows () function. We can add condition by using mysql where clause to the select query and get the conditional rows. The mysql _ num _ rows () function returns the number of rows in a recordset. This function returns FALSE on failure.

MySQL Forums Forum List. The input parameter $ result _set is the output of result set identifier of mysqli_query() , mysqli_store_ result () or mysqli_use_ result (). The output is number of rows present in the result set.

The use of mysqli_ num_rows () depends on whether you use buffered or unbuffered result sets.

In case you use unbuffered ets mysqli_ num_rows () will not correct the correct number of rows until all the rows in the result have been retrieved. Efficiency All I’m doing is maintaining a bit of extra memory and performing a few small comparisons and assignments for each row, so this technique is very efficient. For the most part, it is working properly.

However, when I get an empty result set for my query (that is, the select returns no rows) I get a segmentation fault when trying to call mysql _ num_rows.