Image processing component. The component reads images of any type that .Net understands (jpeg, gif, png, bmp, tif, and possibly others). It can execute simple commands, like resizing, and convert images to a different type.
File mode: Batch
A variable number of files are generated and saved in the database.SQL
SQL Call: Commands (mandatory)
Statement to extract images and commands.
Parameters
Resultset: Images and commands (optional)
Columns
<xxx> mandatory binary
<xxx>filename mandatory string
Command optional string
| Possible value | Description |
|---|---|
| crop(<x>,<y>,<width>,<height>) | Crop image to the requested width and height, starting from pixel x, y. |
| getMetadata | Extracts metadata from the image and then performs the Store metadata call. |
| maxsize(<width>,<height>) | Fit image to requested size, preserving aspect ratio. For example, both maxsize(100,100) and size(100,100) would convert a 500x400 image to a 100x80 image. Unlike the size command, the maxsize command will only shrink images, never grow them. A 50x40 image would stay as a 50x40 image. |
| size(<width>,<height>) | Fit image to requested size, preserving aspect ratio. For example, size(100,100) would convert a 500x400 image to a 100x80 image. The command can also scale images up, for example size(100,100) would grow a 50x40 image to a 100x80 image. |
| thumb(<width>,<height>) | Force image to requested size, preserving aspect ratio, and padding with transparent (for png) or white pixels if necessary. For example, thumb(100,100) would convert a 500x400 image to a 100x80 image, then pad it to become a 100x100 image. |
DestinationFormat optional string
Id mandatory string
SQL Call: Store image (mandatory)
Statement to save image. This command is repeated once for every image returned in the command resultset.
Parameters
SQL Call: Store metadata (mandatory)
This call is made once for every image that included getMetadata among its commands.
The call is made at the time the command occurs in the command list. That is, for the command string getMetadata;size(100,100) the size of the image before it was resized is returned, where for the command string size(100,100);getMetadata the size after it was resized is returned.
Metadata is returned in the following temp table
CREATE TABLE #Metadata
(
Width int NOT NULL,
Height int NOT NULL,
DpiX real NOT NULL,
DpiY real NOT NULL
)
Parameters
SQL Call: Log error (mandatory)
If converting the image fails then this call is made instead of the Store image call.
Parameters
SQL Call: Validate parameters
Allows you to validate the SQL parameters before any other SQL is run in the component. This call is only made if the SQL is a stored procedure and Validate parameters is checked.
Parameters
Resultset: Messages (optional)
Columns
ADMIN_Force optional string
ADMIN_Message optional string
Custom access control and logging
SQL Call: Custom access control and logging
Use this call to restrict which entries a user is allowed to view and edit, and to log which entries a user views.
Access to a menu item is normally controlled through functions and roles alone but some entities need more fine grained control. For example, a user may have access to the View Member menu item for normal members but not for members with a protected identity.
The menu items a user visits are always logged (in ADMINLogMenuItem) but for sensitive data you may need to log exactly what entries are viewed. Do the logging in this call as the common ways of viewing data (grid and InfoSQL) are not allowed to modify the database.
If you bind a scalar function instead of a stored procedure to this call then its name must end with '_GrantAccess'.
Resultset: Access permissions
Columns
GrantAccess mandatory bit
If 0 then an error will be logged as the user should not have been able to reach the menu item with the given parameters in the first place.
Examples
Resizing and converting images
This example is a procedure used by a scheduled job that periodically scans the EmployeePhoto table, converts new photos to JPEG and resizes them to 256x256 pixels.
CREATE OR ALTER PROCEDURE dbo.EmployeePhoto_Resize
@Command bit = 0,
@Id int = 0,
@Filename varchar(300) = NULL,
@Image varbinary(max) = NULL
AS
BEGIN
IF @Command = 1
BEGIN
SELECT TOP (10)
EP.EmployeePhotoId AS Id,
EP.EmployeePhoto,
EP.EmployeePhotoFilename,
'thumb(256,256)' AS Command,
'jpg' AS DestinationFormat
FROM
dbo.EmployeePhoto EP
WHERE
EP.HasBeenConverted = 0;
RETURN;
END;
IF @Id IS NOT NULL
BEGIN
UPDATE dbo.EmployeePhoto SET
EmployeePhoto = @Image,
EmployeePhotoFilename = @Filename,
HasBeenConverted = 1
WHERE
EmployeePhotoId = @Id;
END;
END;