MySQL 5.7 C API Developer Guide / ... / C API Prepared Statement Interface / C API Prepared Statement Function Descriptions / mysql_stmt_errno()
unsigned intmysql_stmt_errno(MYSQL_STMT *stmt) For the statement specified bystmt,mysql_stmt_errno() returns the error code for the most recently invoked statement API function that can succeed or fail. A return value of zero means that no error occurred. Client error message numbers are listed in the MySQLerrmsg.h header file. Server error message numbers are listed inmysqld_error.h. Errors also are listed atError Messages and Common Problems.
If the failed statement API function wasmysql_stmt_close(), do not call ormysql_stmt_errno() to obtain error information becausemysql_stmt_close() makes the statement handler invalid. Callmysql_errno() instead.