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item that matches the data type of the column. Here is a valid INSERT statement for the table that illustrates the use of the ROW constructor:
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INSERT INTO PERSONNEL VALUES (1234, ROW('John', 'J', 'Jones'), ROW('197 Rose St.', 'Chicago', 'IL', ROW(12345, 6789)));
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Defining Abstract Data Types
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With the Informix row data type capabilities illustrated so far, each individual structured column is defined in isolation. If two tables need to use the same row data type structure, it is defined within each table. This violates one of the key principles of object-oriented design, which is reusability. Instead of having each object (the two columns in the two different tables) have its own definition, the row data type should be defined once and then reused for the two columns. Informix Universal Server provides this capability through its named row type feature. (The row data types shown in previous examples are unnamed row data types.) You create an Informix named row type with the CREATE ROW TYPE statement. Here are examples for the PERSONNEL table:
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CREATE ROW F_NAME M_INIT L_NAME TYPE NAME_TYPE ( VARCHAR(15), CHAR(1), VARCHAR(20));
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CREATE ROW TYPE POST_TYPE ( MAIN INTEGER, SFX INTEGER); CREATE ROW STREET CITY STATE POSTCODE TYPE ADDR_TYPE ( VARCHAR(35), VARCHAR(15), CHAR(2), POST_TYPE);
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Note that the definition of a named row type can depend on other, previously created named row types, as shown by the ADDR_TYPE containing a column (POSTCODE) that uses the POST_TYPE row type. With these row data types defined, the name and address columns in the PERSONNEL table (and any other columns holding name or address data in other tables of the database) can be defined using it. The aggressive use of abstract data types can thus help to enforce uniformity in naming and data typing within an objectrelational database. Here is the new Informix definition of the PERSONNEL table, using the just-defined abstract data types:
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CREATE TABLE EMPL_NUM NAME ADDRESS PERSONNEL ( INTEGER, NAME_TYPE, ADDR_TYPE);
24:
SQL and Objects
PERSONNEL Table NAME EMPL NUM 1234 1374 1421 1532 F NAME Sue Sam Joe Rob M INIT J. F. P. G. L NAME Marsh Wilson Jones Mason STREET 1803 Main St. 564 Birch Rd. 13 High St. 9123 Plain Av. ADDRESS POSTCODE CITY STATE MAIN SFX Alamo NJ 31948 4567 Marion KY 82942 3524 Delano NM 13527 2394 Franklin PA 83624 2643
FIGURE 24-1
PERSONNEL table using abstract data types
Figure 24-1 shows some sample data for this table and the hierarchical column/field structure created by the abstract data types. Oracle supports abstract data types through a very similar structure, with slightly different SQL syntax. Here is the Oracle CREATE TYPE statement to create the same abstract data structure for names and addresses:
CREATE TYPE F_NAME M_INIT L_NAME NAME_TYPE AS OBJECT ( VARCHAR2(15), CHAR(1), VARCHAR2(20));
CREATE TYPE POST_TYPE AS OBJECT ( MAIN NUMBER, SFX NUMBER); CREATE TYPE STREET CITY STATE POSTCODE ADDR_TYPE AS OBJECT ( VARCHAR2(35), VARCHAR2(15), CHAR(2), POST_TYPE);
Oracle calls the abstract data type an object instead of a row type. In fact, the type is functioning as an object class in the usual object-oriented terminology. Extending the objectoriented terminology further, the individual components of an Oracle abstract data type are referred to as attributes (corresponding to the Informix fields described earlier). The ADDR_ TYPE type has four attributes in this example. The fourth attribute, POSTCODE, is itself an abstract data type. Both Oracle and Informix use the extended dot notation to refer to individual data elements within abstract data types. With nested abstract types, it takes several levels of dot-delimited names to identify an individual data item. The main postal code within the PERSONNEL table is identified as:
PERSONNEL.ADDRESS.POSTCODE.MAIN
PART VI
If the table were owned by another user, Sam, the qualified name would become even longer:
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