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Introduction
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In this example, we’ll show you how to use BLOB fields in Profound UI. Below, we explain how to convert a BLOB field into an image, so that you can display this image in Profound UI. For this example, we will be making use of the pui.downloadURL() API and the PUIDNLEXIT program.
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We won’t go into detail about the parameters set in this exit program. You can learn more about the different parameters for the PUIDNLEXIT program in the documentation. It is also important to note that we did not modify any of the parameters in PUIDNLEXIT from sample that is shipped with Profound UI, but we are using the id property to pass a "key" value instead of an IFS path. You can read more about that here.
This PUIDNLEXIT program is called twice. The first time it is called before the download, timingFlag = 0. This is where you will actually write the image to the IFS in the program. IBM has more detailed information about LOB files here on their website that will also help you with understanding parts of this program. A few important notes about this section of the program:
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