Chapter 4. Building Berkeley DB for the BREW simulator
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## Chapter 4. Building Berkeley DB for the BREW simulator

This chapter has general instructions for building the Berkeley DB library and applets for the BREW platform.

The `build_brew` directory in the Berkeley DB distribution contains project files for Microsoft Visual C++:

Project File | Description
--- | ---
bdb_brew.dsw | Visual C++ 6.0 workspace
bdb_brew.dsp | Visual C++ 6.0 project

The project file can be used to build the Berkeley DB library for the BREW platform. Both BREW SDK versions 2 and 3 are supported. By default, the build is for BREW SDK version 2.

The steps for building the Berkeley DB library for the BREW Simulator are as follows:

1. Install the BREW SDK and BREW SDK Tools.
2. To build for BREW SDK version 3, edit the Berkeley DB source distribution file `build_brew/db_config.h` file and remove the line "#define HAVE_BREW_SDK2". No changes are required to build for BREW SDK version 2.
3. Select File -> Open Workspace. Look in the build_brew directory for Workspaces, select bdb_brew.dsw, and select Open.
4. The BREW SDK creates an environment entry "BREWDIR" after the SDK installation. Confirm the entry exists, and if not, create an environment entry which points to the BREW SDK's root directory.
5. For the BREW platform, only the project "bdb_brew" is available. Set the bdb_brew project as the active project and select the appropriate option for the build_all project (Debug or Release). Then select OK.
6. To build, press F7.

The build results are placed in a subdirectory of build_brew named after the selected configuration (for example, `build_brew\Release` or `build_brew\Debug`).

When building the application during development, you should normally use compile options "Debug Multithreaded DLL" and link against `build_brew\Debug\bdb_brew.lib`. You can also build using a release version of the Berkeley DB libraries and tools, which will be placed in `build_brew\Release\bdb_brew.lib`. When linking against the release build, you should compile your code with the "Release Multithreaded DLL" compile option. You will also need to add the `build_brew` directory to the list of include directories of your application's project, or copy the Berkeley DB include files to another location.

## Building a BREW applet with Berkeley DB library

Building a Berkeley DB application in the BREW environment is similar to building in a Windows environment. Ensure that `db.h` is in the build include path and `bdb_brew.lib` is in the build library path (alternatively, you can add project dependencies to the `bdb_brew` project).

BREW applets require a few minor additions:

1. The BDBApp structure must be extended -- the extended definition of BDBApp is found in the include file `db.h`.
2. Before any Berkeley DB operations are performed, the applet must call the "int brew_bdb_begin(void)" function. This function returns 0 on success, and non-zero on failure.
3. After the last Berkeley DB operation is performed, the applet must call the "void brew_bdb_end(void)" function. Note that the brew_bdb_end function cannot be called in the applet "cleanup" function. If that is a requirement, use the following code instead:

       BDBApp *pMe=(BDBApp *)po;
       if (pMe->db_global_values != NULL)
       	FREE(pMe->db_global_values);

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