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Showing content from https://mariadb.com/docs/connectors/mariadb-connector-c/api-functions/mysql_fetch_lengths below:

mysql_fetch_lengths | MariaDB Documentation

mysql_fetch_lengths | MariaDB Documentation
  1. Connector/C
  2. MariaDB Connector/C API Functions
mysql_fetch_lengths
unsigned long * mysql_fetch_lengths(MYSQL_RES * result);

The mysql_fetch_lengths() function returns an array containing the lengths of every column of the current row within the result set (not including terminating zero character) or NULL if an error occurred.

mysql_fetch_lengths() is valid only for the current row of the result set. It returns NULL if you call it before calling mysql_fetch_row() or after retrieving all rows in the result.

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