Difference between revisions of "AFIELDS()"
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Revision as of 15:36, 1 June 2009
Class
Array Processing
Purpose
Function to fill a series of arrays with table structure details
Syntax
AFIELDS(<array1> [,<array2> [,<array3> [,<array4>]]])
AFIELDS(<array> [,<workarea | alias>])
See Also
AADD(), AAVERAGE(), ABROWSE(), ACHOICE(), ACOL(), ACOPY(), ADEL(), ADESC(), ADIR(), AELEMENT(), AFILL(), AINS(), ALEN(), AMAX(), AMIN(), APPEND FROM ARRAY, AROW(), ASCAN(), ASIZE(), ASORT(), ASTORE(), ASTRING(), ASUBSCRIPT(), ASUM(), COPY TO ARRAY, DECLARE, DIMENSION, GATHER, LOCAL, PRIVATE, PUBLIC, RELEASE, RESTORE, SAVE, SCATTER, SET COMPATIBLE
Description
The AFIELDS() function returns the number of fields in the table in the current workarea and loads the field names into an array, <array1>. The field types, field lengths and field decimals can also be loaded into individual arrays.
| Parameters | Description |
|---|---|
| <array1> | The name of a pre-declared array in which to load the character string field name. |
| <array2> | The name of a pre-defined array in which to load the field data types as character strings. |
| <array3> | The name of a pre-defined array in which to load the field lengths as numeric values. |
| <array4> | The name of a pre-defined array in which to load the field decimal places as numeric values. If the field is not a numeric data type or has no decimal places, then zero is returned. |
The SET FIELDS command can be used to restrict the active fields and therefore determine which fields are copied into the array.
With SET COMPATIBLE set to FoxPro, Foxbase or VFP, the AFIELDS() function syntax conforms to Visual FoxPro behavior. The information detailed in the table below is loaded into the 18 columns of the single array <array>. Each row in the array corresponds to a field in the table. If the optional <workarea | alias> is specified, then the function will operate in the required location, otherwise it will operate in the current workarea.
| Column | Information | Data Type |
|---|---|---|
| 1 | Field name | Character |
| 2 | Field type:
C = Character Y = Currency D = Date T = DateTime B = Double F = Float G = General I = Integer L = Logical M = Memo N = Numeric Q = Varbinary V = Varchar and Varchar (Binary) W = Blob||Character | |
| 3 | Field width | Numeric |
| 4 | Decimal places | Numeric |
| 5 | Null values allowed | Logical |
| 6 | Code page translation not allowed | Logical |
| 7 | Field validation expression | Character |
| 8 | Field validation text | Character |
| 9 | Field default value | Character |
| 10 | Table validation expression | Character |
| 11 | Table validation text | Character |
| 12 | Long table name | Character |
| 13 | Insert trigger expression | Character |
| 14 | Update trigger expression | Character |
| 15 | Delete trigger expression | Character |
| 16 | Table comment | Character |
| 17 | NextValue for autoincrementing | Numeric |
| 18 | Step for autoincrementing | Numeric |
Example
use patrons declare tab1(12),tab2(12),tab3(12),tab4(12) fields = afields(tab1,tab2,tab3,tab4) //VFP example set compatible to vfp use orders in 0 use products in 0 nFIELDS = AFIELDS(array1,"orders")
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
