Informix DataBlade API Programmer's Manual DataBlade API Function Descriptions

The mi_column_precision() function obtains the precision of the specified column from a row descriptor.

mi_integer mi_column_precision(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

The mi_column_precision() function obtains the column precision of column_id in the row descriptor that row_desc references. The precision is an attribute of the column data type that represents the total number of digits the column can hold, as follows.

If you call mi_column_precision() on a column with some other data type, the function returns zero (0).

A row descriptor describes the structure of a row or a composite value. You can call either the mi_get_row_desc() or mi_get_row_desc_without_row() function to obtain the row descriptor.

See the description of the following functions: mi_column_id(), mi_column_name(), mi_column_nullable(), mi_column_scale(), mi_column_type_id(), mi_column_typedesc(), mi_get_row_desc(), and mi_get_row_desc_without_row().

For information about row descriptors and column information, see Using a Row Descriptor.