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INSTR(locator, pattern, offset, i) Returns (as an integer value) the position within the LOB identified by the locator where the ith occurrence of pattern is matched; the returned value may be used as an offset in subsequent LOB processing calls Oracle imposes one further restriction on updates and modifications to LOB values that are performed through these functions LOBs can impose an unacceptably high overhead on Oracle s transaction mechanisms, so Oracle normally does not lock the contents of a LOB data item when the row containing the LOB is read by an application program or a PL/SQL routine If the LOB data is to be updated, the row must be explicitly locked prior to modifying it This is done by including a FOR UPDATE clause in the SELECT statement that retrieves the LOB locator Here is a PL/SQL fragment that.

Part VI:

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In addition to the DISTINCT and ALL keywords, the SELECT clause includes the asterisk (*) and the <select list> placeholder. You must specify one of these options in the clause. If you specify the asterisk, all applicable columns are included in the query result. If you don t specify an asterisk in the SELECT clause, you must specify each column as it is derived from its source. The <select list> placeholder can be broken down into the following syntax: <derived column> [ [ AS ] <column name> ] [ { , <derived column> [ [ AS ] <column name> ] } . . . ] Let s take a look at the first line of this syntax. (The second line is merely a repeat as many times as necessary of the first line.) The <derived column> placeholder in most cases refers to the name of the column in the source table. If more than one column is specified, then they must be separated with commas. However, the <derived column> placeholder might also refer to a column or set of columns that are in some way part of an expression. For instance, in 5, I discuss the AVG function, which averages the values in a specified column. The example I show in that chapter uses a SELECT statement to query data from the EMPLOYEE_COMMISSIONS table, which lists the total amount of commissions each

retrieves a row containing a LOB that contains document text, and that updates 100 characters in the middle of the LOB data:

7:

declare lob CLOB; textbuf varchar(255); begin /* Put text to be inserted into buffer / . . . /* Get select from where for lob locator and lock LOB for update */ document_lob into lob documents document_id = '34218' update;

/* Write new text 500 bytes into LOB */ dbms_lob.write(lob,100,500,textbuf); commit; end;

employee made during a three-year period. The SELECT statement averages the values in three different columns, as shown in the following SELECT statement:

The data types envisioned by the relational data model are simple, indivisible, atomic data values. If a data item such as an address is actually composed of a street address, city, state, and postal code, as a database designer, you have two choices. You can treat the address as four separate data items, each stored in its own column, so that you can search and retrieve the items individually. Or you can treat the address as a single unit, in which case, you cannot process its individual component parts within the database. There is no middle ground that allows you to treat the address as a unit for certain situations and to access its component parts for others. Many programming languages (including even non object-oriented languages like C or Pascal) do provide such a middle ground. They support compound data types or named data structures. The data structure is composed of individual data items or lower-level structures, which can be accessed individually. But the entire data structure can also be treated as a single unit when that is most convenient. Structured or composite data types in object-relational databases provide this same capability in a DBMS context. Informix Universal Server supports abstract data types through its concept of row data types. You can think of a row type as a structured sequence of individual data items, called fields. Here is an Informix CREATE TABLE statement for a simple PERSONNEL table that uses a row data type to store both name and address information:

CREATE TABLE PERSONNEL ( EMPL_NUM INTEGER, NAME ROW(

SELECT AVG(YEAR_1999), AVG(YEAR_2000), AVG(YEAR_2001) FROM EMPLOYEE_COMMISSIONS;

24:

In this case, there are three expressions that are used for the <derived column> placeholder: AVG(YEAR_1999), AVG(YEAR_2000), and AVG(YEAR_2001). Notice that each derived column expression is separated by a comma, as would be the case if each value were simply a column name. The following example shows the same SELECT statement as in the preceding example, except that it uses only column names as the derived columns:

VARCHAR(15), CHAR(1), VARCHAR(20)) ROW( VARCHAR(35), VARCHAR(15), CHAR(2), ROW( INTEGER, INTEGER)));

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