4D v16.3
Is field number valid
- 4D Language Reference
-
- Structure Access
-
- Structure Access Commands
- CREATE INDEX
- DELETE INDEX
- EXPORT STRUCTURE
- Field
- Field name
- Get external data path
- GET FIELD ENTRY PROPERTIES
- GET FIELD PROPERTIES
- Get last field number
- Get last table number
- GET MISSING TABLE NAMES
- GET RELATION PROPERTIES
- GET TABLE PROPERTIES
- IMPORT STRUCTURE
- Is field number valid
- Is table number valid
- PAUSE INDEXES
- REGENERATE MISSING TABLE
- RELOAD EXTERNAL DATA
- RESUME INDEXES
- SET EXTERNAL DATA PATH
- SET INDEX
- Table
- Table name
Is field number valid
| Is field number valid ( tableNum | tablePtr ; fieldNum ) -> Function result | ||||||||
| Parameter | Type | Description | ||||||
| tableNum | tablePtr | Longint, Pointer |
|
Table number or Pointer to table | |||||
| fieldNum | Longint |
|
Field number | |||||
| Function result | Boolean |
|
True = field exists in the table False = field does not exist in the table | |||||
The Is field number valid command returns True if the field whose number is passed in the fieldNum parameter exists in the table whose number or pointer is passed in the tableNum or tablePtr parameter. If the field does not exist, the command returns False. Keep in mind that the command returns False if the table containing the field is in the Trash of the Explorer.
This command can be used to detect any field deletions, which create gaps in the sequence of field numbers.
Product: 4D
Theme: Structure Access
Number:
1000
Created: 4D v11 SQL
4D Language Reference ( 4D v16)
4D Language Reference ( 4D v16.1)
4D Language Reference ( 4D v16.2)
4D Language Reference ( 4D v16.3)
