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https://dev.mysql.com/doc/c-api/8.4/en/mysql-error.html
const char * mysql_error(MYSQL *mysql) Description For the connection specified by mysql, mysql_error() returns a null-terminated string containing the error message for the most recently invoked API function that failed. If a function did not ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-fetch-field-direct.html
For metadata-optional connections, this function returns NULL when the resultset_metadata system variable is set to NONE. MYSQL_FIELD * mysql_fetch_field_direct(MYSQL_RES *result, unsigned int fieldnr) Description Given a field number fieldnr for a ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-fetch-field.html
For metadata-optional connections, this function returns NULL when the resultset_metadata system variable is set to NONE. MYSQL_FIELD * mysql_fetch_field(MYSQL_RES *result) Description Returns the definition of one column of a result set as a ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-fetch-fields.html
For metadata-optional connections, this function returns NULL when the resultset_metadata system variable is set to NONE. MYSQL_FIELD * mysql_fetch_fields(MYSQL_RES *result) Description Returns an array of all MYSQL_FIELD structures for a result ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-fetch-row.html
Errors Errors are not reset between calls to mysql_fetch_row() CR_SERVER_LOST The connection to the server was lost during the query. MYSQL_ROW mysql_fetch_row(MYSQL_RES *result) Description Note mysql_fetch_row() is a synchronous function. Its ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-field-count.html
unsigned int mysql_field_count(MYSQL *mysql) Description Returns the number of columns for the most recent query on the connection. The normal use of this function is when mysql_store_result() returned NULL (and thus you have no result set pointer). In this case, you can call mysql_field_count() to determine whether mysql_store_result() should have produced a nonempty ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-init.html
MYSQL * mysql_init(MYSQL *mysql) Description Allocates or initializes a MYSQL object suitable for mysql_real_connect(). If mysql_init() allocates a new object, it is freed when mysql_close() is called to close the connection. If mysql is a NULL ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-insert-id.html
The value of mysql_insert_id() is affected only by statements issued within the current client connection. uint64_t mysql_insert_id(MYSQL *mysql) Description Returns the value generated for an AUTO_INCREMENT column by the previous INSERT or UPDATE ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-kill.html
CR_SERVER_LOST The connection to the server was lost during the query. int mysql_kill(MYSQL *mysql, unsigned long pid) Description Note mysql_kill() is deprecated and is subject to removal in a future version of MySQL. mysql_kill() cannot handle ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-library-end.html
Call it when you are done using the library (for example, after disconnecting from the server). Note To avoid memory leaks after the application is done using the library (for example, after closing the connection to the server), be sure to call ...