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EMPNO NUMLIST ------- ---------------------------------------7369 7499 7521 7566 7654 7698 7782 7788 7839 7844 7876 7900 7902 7934 The query results are not impressive. Obviously, the new NUMLIST column is still empty. So we have the following two problems to solve: How can we populate the NUMLIST column with phone numbers After the column has these phone numbers, how can we retrieve them
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As mentioned earlier in the chapter, each user-defined object type implicitly has a function of the same name, allowing you to generate or construct values of that object type. This function is normally referred to as the constructor method. In other words, if you create a user-defined object type, you get a constructor method for free, with the same name as the object type. Listing 12-4 shows how you can assign phone number lists to five employees in the E table. Note that you can skip elements, if you like, and you can also assign empty number lists. Listing 12-4. Assigning Values to the NUMLIST Column update e set numlist = numberlist_t('1234','06-78765432','029-8765432') where empno = 7839; update e set numlist = numberlist_t('4231','06-12345678') where empno = 7782; update e set numlist = numberlist_t('2345') where empno = 7934; update e set numlist = numberlist_t('','06-23456789') where empno = 7698;
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update e set numlist = numberlist_t() where empno in (7566,7844);
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Now let s see what happens if we select the NUMLIST column, without applying any functions or operators to that column. In that case, we simply get the values back the same way we inserted them, including the constructor method, as shown in Listing 12-5. Listing 12-5. Querying the NUMLIST Column select empno, numlist from e where empno in (7566,7698,77832,7839,7934); EMPNO -------7566 7698 7839 7934 NUMLIST -------------------------------------------------NUMBERLIST_T() NUMBERLIST_T(NULL, '06-23456789') NUMBERLIST_T('1234', '06-78765432', '029-8765432') NUMBERLIST_T('2345')
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If you want to select individual phone numbers from the NUMLIST array, you need to un-nest the phone numbers first. You can un-nest arrays with the TABLE function. Listing 12-6 shows how you can use the TABLE function for that purpose. (For further details about the TABLE function, see Oracle SQL Reference.) Listing 12-6. Using the TABLE Function to Un-Nest the NUMLIST Array break on empno select e.empno, n.* from e , TABLE(e.numlist) n; EMPNO COLUMN_VALUE -------- -----------------7698 06-23456789 7782 4231 06-12345678 7839 1234 06-78765432 029-8765432 7934 2345 Suppose that we want to go one step further and be able to select specific phone numbers from the array (for example, the second one). In that case, we need PL/SQL again, because the SQL language does
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not support a direct way to access array elements by their index value. It is not difficult to build a PL/SQL function to return a certain element from an array. 5 showed an example of a PL/SQL stored function to count the number of employees per department (Listing 5-31). Listing 12-7 shows how you can create a PL/SQL stored function to return the first phone number from the NUMLIST array, assuming that number represents the internal extension number. Listing 12-7. Creating a PL/SQL Function to Return Array Elements create or replace function ext (p_varray_in numberlist_t) return varchar2 is v_ext varchar2(20); begin v_ext := p_varray_in(1); return v_ext; end; / Function created. select ename, init, ext(numlist) from e where deptno = 10; ENAME -------CLARK KING MILLER INIT ----AB CC TJA EXT(NUMLIST) -----------4231 1234 2345
The DEPTNO value (10) in the WHERE clause of this query is carefully chosen, in order to avoid error messages. Just change the DEPTNO value in Listing 12-7, and you will see the corresponding Oracle error messages.
Note The EXT stored function is kept as simple as possible. For example, there is no code to handle situations where employees have no phone number list or an empty phone number list. It is relatively easy to enhance the EXT function definition with some proper exception handling. However, this is not a PL/SQL book, and the EXT function is meant only to illustrate the concept.
It is impossible to update specific elements of an array. You can only replace an entire array value with a new one.
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