28. 7. 15. 1 mysql _fetch _row _nonblocking ()

enum net_async_status mysql_fetch_row_nonblocking(MYSQL_RES *result, MYSQL_ROW *row)

Description

Note

mysql_fetch_row_nonblocking() is an asynchronous function. It is the counterpart of the mysql_fetch_row() synchronous function, for use by applications that require asynchronous communication with the server. For general information about writing asynchronous C API applications, see Section 28.7.12, “C API Asynchronous Interface”.

mysql_fetch_row_nonblocking() is used similarly to mysql_fetch_row(). For details about the latter, see Section 28.7.7.21, “mysql_fetch_row()”. The two functions differ as follows:

mysql_fetch_row() returns a MYSQL_ROW value containing the next row, or NULL. The meaning of a NULL return depends on which function was called preceding mysql_fetch_row():
- When used after mysql_store_result() or mysql_store_result_nonblocking(), mysql_fetch_row() returns NULL if there are no more rows to retrieve.
- When used after mysql_use_result(), mysql_fetch_row() returns NULL if there are no more rows to retrieve or an error occurred.
mysql_fetch_row_nonblocking() returns an enum net_async_status status indicator and takes a second row argument that provides a pointer to a MYSQL_ROW value. When the return status is NET_ASYNC_COMPLETE, the row argument is a pointer to a MYSQL_ROW value containing the next row, or NULL. The meaning of NULL depends on which function was called preceding mysql_fetch_row_nonblocking():
- When used after mysql_store_result() or mysql_store_result_nonblocking(), the row argument is NULL if there are no more rows to retrieve.
- When used after mysql_use_result(), the row argument is NULL if there are no more rows to retrieve or an error occurred.

mysql_fetch_row_nonblocking() was added in MySQL 8.0.16.

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Return Values

Returns an enum net_async_status value. See the description in Section 28.7.13, “C API Asynchronous Interface Data Structures”. A NET_ASYNC_ERROR return status indicates an error.

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Example

See Section 28.7.12, “C API Asynchronous Interface”.

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Document created the 26/06/2006, last modified the 26/10/2018
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References

Manuel MySQL : https://dev.mysql.com/

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