DataBlade Developers Kit User's Guide
Chapter 9: Testing and Debugging DataBlade Modules on Windows
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Using the Dynamic Link Library File
A DataBlade module exists in the Informix database server as a dynamic link library. The dynamic link library file is loaded into the database server after the database server is started, when one of its routines is called; it is unloaded when the database server is stopped.
Replacing a Dynamic Link Library File
When a DataBlade module is loaded onto an Informix database server, the database server stores it in the database server memory map. If you overwrite a dynamic link library file while it is loaded in the database server, you cause a sharing violation. Therefore, to unload the old dynamic link library file and load the new one, you must stop and restart the database server.
Warning:
If you do not stop and restart the database server after replacing a dynamic link library, you receive warnings about replacing a file in use. The database server might fail if you call the replaced dynamic link library.
Dynamic Link Library Permissions
For an Informix database server to load a dynamic link library, the library's attributes must be set to read-only. The
project
.bld
file is normally set to read-only if you compile using the
WinNT.mak
makefile.
If you use the Visual C++
project
.mak
file, however, you must set the attributes of a dynamic link library to read-only by displaying the Properties dialog box for the file using Windows Explorer, then checking the
Read-only
check box.
When you replace an existing dynamic link library with a new one, you might need to remove the read-only condition from the file properties. If you are testing and debugging locally on one computer, you might have permission to overwrite files with read-only attributes.
See
"Compiling on Windows NT"
for more information on compiling.
DataBlade Developers Kit User's Guide
, version 3.6
Copyright © 1998, Informix Software, Inc. All rights reserved.
