A set of fields makes up a data object or an update to an object. Standard record objects are made up of fields, whereas other types of data may store data in a different way.

Note:While fields can be represented by either a field number or a field name, DataSource uses field numbers to send data updates. However, if field names are configured it is possible to use the names by utilising the ds_add_record set of functions instead of the ds_add_data functions (see Publishing Record Data and Creating Data Objects).

`add-field`

Type: Function
Default: None

Defines a field number/name mapping.

Format:

add-field FieldName FieldNumber FieldFlags [FieldFlagsData]

Name	Type	Default	Field Format
FieldName	string	[no default]	The name of the field
FieldNumber	integer	[no default]	The number of the field. This must be in the range -65535 to 65535.
FieldFlags	integer	0	The flags passed by the field.
FieldFlagsData	integer	-1	Additional data (specifies the number of decimal places the field uses when FieldFlags is set to 256 or the type of field when FieldFlags is set to 512).
FieldFormat	integer	[none]	Defines the formatting of values added to this field.

Note: There is no need to add fields unless the application is using text-based field names.

The table below shows the acceptable values of FieldFlags and the corresponding meanings of FieldFlagsData and FieldFormat. FieldFlags can be represent by either a text string or an integer.

These strings may be ORed together using the "|" operator to represent multiple flags: for example "type3|dp" means a field is type3 and uses the decimal point precision mode.

FieldFlags (text)	FieldFlags (integer)	Description	FieldFlagsData	FieldFormat
type2 index	1	Identifies the field as a Type 2 index	Not Used	Not Used
type2	2	Identifies the field as a Type 2 field	Not Used	Not Used
type3	4	Identifies the field as a Type 3 field	Not Used	Not Used
dp decimal_precision	256	Decimal point precision mode	Number of decimal places	Not Used
fmt format	512	Format mode	Field type	Format string (eg "%%.12g")
fmt_id format_id/td>	1024	Format set mode	Not Used	Name of format set as specified using add-field-format

The table below lists the field types that can be used in FieldsFlagsData when in Format mode (FieldFlags = 512)

Type	Description
1	32 bit float
2	64 bit float
3	8 bit integer
4	16 bit integer
5	32 bit integer
6	64 bit integer

`fields-float32-fmt`

Type: String
Default: %.8g

Format for float32 types

`fields-float64-fmt`

Type: String
Default: %.12g

Format for float64 types

`fields-int8-fmt`

Type: String
Default: %hhd

Format for int8 types

`fields-int16-fmt`

Type: String
Default: %hd

Format for int16 types

`fields-int32-fmt`

Type: String
Default: %ld

Format for int32 types

`fields-int64-fmt`

Type: String
Default: %lld

Format for int64 types

Configuration group `add-field-format`

This option defines sets of format strings which can be used by the add-field option. The formats defined will only work with the functions details in Publishing Record Data.

Format:

add-format
name [value]
    float32-fmt [value]
    float64-fmt [value]
    int8-fmt    [value]
    int16-fmt   [value]
    int32-fmt   [value]
    int64-fmt   [value]
end format