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Note that you can t create a function if your database already has a function with the same name and parameter number and types. You can, however, have multiple functions with the same name but different parameters (this method is called overloading in OOP [Object Oriented Programming] terminology). The key is that when calling the function, PostgreSQL must know which version of the function to call, and it can do that if the parameters are different. To change an existing function, you should use CREATE OR REPLACE FUNCTION instead of CREATE FUNCTION, which creates the function if it doesn t already exist or updates the function if it does exist. We ll use types to specify what kind of data the function returns. A type is defined like this: CREATE TYPE name AS ( attribute_name data_type [, ... ] ) For the data tier of the departments list, you need to create a type called department_list and a function called catalog_get_departments_list. Let s do this in the following exercise.

SQL> @gender_ov.sql o_gender.id = 131 o_gender.code = T o_gender.description = Test o_gender.active_date = 20070223 o_gender.inactive_date = 20070223 r_gender.id = 131 r_gender.code = T r_gender.description = Test r_gender.active_date = 20070223 r_gender.inactive_date = 20070223 Test completed successfully.

However, if the column documents whether an employee has passed the company s drug test, you probably wouldn t want to set a default value. In this case, use the Choice column type, and then set Yes and No as the choices, with no default value for the column. If the column is blank, you know the information hasn t yet been recorded, and you won t erroneously assume the employee passed or didn t pass just because no one changed the default.

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1. Start pgAdmin III, and connect to the hatshop database using the hatshopadmin username. 2. pgAdmin III has the interface elements that you can use to create types without writing code (you can check by right-clicking on Types, and selecting New Type). However, because the interface is not particularly friendly, we prefer to write and execute the code that performs the same actions. Choose Tools Query Tool, and write this code: CREATE TYPE department_list AS ( department_id INTEGER, name VARCHAR(50) ); 3. Press F5 to execute the command. The output should be similar to Query returned successfully with no result in 30 ms. 4. Choose Edit Clear Window to clear the current contents, and write the following code that creates the catalog_get_departments_list function: CREATE FUNCTION catalog_get_departments_list() RETURNS SETOF department_list LANGUAGE plpgsql AS $$ DECLARE outDepartmentListRow department_list; BEGIN FOR outDepartmentListRow IN SELECT department_id, name FROM department ORDER BY department_id LOOP RETURN NEXT outDepartmentListRow; END LOOP; END; $$;

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5. Press F5 to execute the command. The output should once again say that the command executed successfully with no result. 6. To test that the new function returns what it s supposed to, clear again the contents of the window, and type the following query. The list of departments should be retrieved (see Figure 3-13). SELECT * FROM catalog_get_departments_list();

With this column type, you can insert a hyperlink or an actual image into the list. The hyperlink can be to any web page, and users can test the link to make sure it works. Users follow the same process regardless of whether you choose the Hyperlink or Picture option in the Format URL as drop-down list. The difference is whether the actual picture or just a link to the picture appears in the list. If you plan to use this column type to display photos, create a SharePoint picture library first and upload the pictures you want to use into it. With the Picture option selected, the photos are displayed in the list beside the other text fields. For this reason, you probably want to use thumbnails rather than full-size photos. Use a photo editing tool, such as Microsoft Digital Image 2006 or Adobe Photoshop, to save a thumbnail of the photo to the SharePoint picture library. When users input a new record, they enter a hyperlink to the photo in the picture library, or a hyperlink to the web page into the Type the Web address text box, as you can see in Figure 4-4. Encourage them always to test the link by clicking Click here to test. The image or web page should open successfully.

CH APT ER 6 JUST LI KE IT IS I N T HE REAL WO RLD !

Figure 3-13. Executing a function using pgAdmin III 7. Close the Query tool window. If asked to save the changes, click No.

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