MI_TYPEID *mi_column_type_id(row_desc, column_id)
   MI_ROW_DESC *row_desc;
   mi_integer column_id;

row_desc

is a pointer to the row descriptor of the row that contains the column.

column_id

indicates the column identifier, which specifies the position of the column in the specified row descriptor. Column numbering follows C array-indexing conventions: the first column in the row is at position zero (0).

Valid in Client LIBMI Application?	Valid in User-Defined Routine?
Yes	Yes

A row descriptor can describe the structure of a row in a table or the structure of a row type. From the row descriptor that row_desc references, the mi_column_type_id( ) function obtains the type identifier of a column for either structure:

• The type identifier of the column at position column_id in the row
• The type identifier of the field at position column_id for the row type

The type identifier is an integer that uniquely identifies a data type.

An MI_TYPEID pointer

is a pointer to the type identifier of the data type for the specified column or field.

NULL

indicates that the function was not successful.

See also the descriptions of mi_column_count( ), mi_column_id( ), mi_column_name( ), mi_column_nullable( ), mi_column_precision( ), mi_column_scale( ), mi_column_typedesc( ), mi_get_row_desc( ), and mi_get_row_desc_without_row( ).

For more information about row descriptors or about type identifiers, see the IBM Informix: DataBlade API Programmer's Guide.