Here is a list of C API data types from the mysql.h header file:
MYSQLA database handle structure created by
mysql_init() and released with
mysql_close().
MYSQL_RESA structure for a results set from an SQL query. This
structure is used by fetch functions and is released with
mysql_free_result().
MYSQL_ROWA structure for holding a row of data from a results set. The
data is retrieved from this structure by the
mysql_fetch_row() function.
MYSQL_FIELDA structure for holding an array of information about a field
of a results set. The array may be set with the
mysql_fetch_field() function. The elements
include name, table, and
def for the default value.
MYSQL_FIELD_OFFSETUsed for recording a pointer location for a results set. The
offset value can be retrieved by the
mysql_row_tell() function and deployed with
mysql_row_seek().
my_ulonglongA variable type for storing the number of rows for functions
such as mysql_affected_rows(),
mysql_num_rows(), and
mysql_insert_id(). To print the value of a
variable using this type, copy the value to another variable that
uses the unsigned long type.