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Databases - Practical PostgreSQL
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Creating Functions

Creating functions within PgAccess is also fairly simple. First click on the Functions tab, then click New. You should now be presented with the Function window. Here, you may enter the name of your new function, the parameters it takes (comma-separated), the language it is written in (e.g., SQL , C , plpgsql , etc.), and the type of data it returns (if the function returns a value). Once you have defined those options, enter the body of the function in the white box that takes up most of the screen (or the location in the filesystem of the shared object file, if it is a C function). Once finished, click Save.

Note: You may view existing function definitions by selecting one from the function list, and clicking Open.

Figure 6-5 illustrates a simple example function, which selects the name of an author based on the id value in the authors table.

Figure 6-5. The Function dialog box

We will continue the discussion about creating functions in the next chapter.

Databases - Practical PostgreSQL
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