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CHAPTER 12 DATATYPES
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So, what is the solution If you want to make use of these columns in SQL, then you ll need to convert them to a SQL-friendly type. You can use a user-defined function for doing so. The following example demonstrates how to accomplish this using a LONG SUBSTR function that will allow you to effectively convert any 4,000 bytes of a LONG type into a VARCHAR2 for use with SQL. When you are done, you ll be able to query: ops$tkyte@ORA11GR2> select * 2 from ( 3 select owner, view_name, 4 long_help.substr_of( 'select text 5 from dba_views 6 where owner = :owner 7 and view_name = :view_name', 8 1, 4000, 9 'owner', owner, 10 'view_name', view_name ) substr_of_view_text 11 from dba_views 12 where owner = user 13 ) 14 where upper(substr_of_view_text) like '%INNER%' 15 / You ve converted the first 4,000 bytes of the TEXT column from LONG to VARCHAR2 and can now use a predicate on it. Using the same technique, you could implement your own INSTR, LIKE, and so forth for LONG types as well. In this book, I ll only demonstrate how to get the substring of a LONG type. The package we will implement has the following specification: ops$tkyte@ORA11GR2> create or replace package long_help 2 authid current_user 3 as 4 function substr_of 5 ( p_query in varchar2, 6 p_from in number, 7 p_for in number, 8 p_name1 in varchar2 default NULL, 9 p_bind1 in varchar2 default NULL, 10 p_name2 in varchar2 default NULL, 11 p_bind2 in varchar2 default NULL, 12 p_name3 in varchar2 default NULL, 13 p_bind3 in varchar2 default NULL, 14 p_name4 in varchar2 default NULL, 15 p_bind4 in varchar2 default NULL ) 16 return varchar2; 17 end; 18 / Package created. Note that on line 2, we specify AUTHID CURRENT_USER. This makes the package run as the invoker, with all roles and grants in place. This is important for two reasons. First, we d like the database security to not be subverted this package will only return substrings of columns we (the invoker) are allowed to see. Specifically, that means this package is not vulnerable to SQL injection attacks it is not running as the owner of the package but as the invoker. Second, we d like to install this package once in the database and have its functionality available for all to use; using invoker rights allows us to do that. If we
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CHAPTER 12 DATATYPES
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used the default security model of PL/SQL definer rights the package would run with the privileges of the owner of the package, meaning it would only be able to see data the owner of the package could see, which may not include the set of data the invoker is allowed to see. The concept behind the function SUBSTR_OF is to take a query that selects at most one row and one column: the LONG value we are interested in. SUBSTR_OF will parse that query if needed, bind any inputs to it, and fetch the results programmatically, returning the necessary piece of the LONG value. The package body, the implementation, begins with two global variables. The G_CURSOR variable holds a persistent cursor open for the duration of our session. This is to avoid having to repeatedly open and close the cursor and to avoid parsing SQL more than we need to. The second global variable, G_QUERY, is used to remember the text of the last SQL query we ve parsed in this package. As long as the query remains constant, we ll just parse it once. So, even if we query 5,000 rows in a query, as long as the SQL query we pass to this function doesn t change, we ll have only one parse call: ops$tkyte@ORA11GR2> create or replace package body long_help 2 as 3 4 g_cursor number := dbms_sql.open_cursor; 5 g_query varchar2(32765); 6 Next in this package is a private procedure, BIND_VARIABLE, that we ll use to bind inputs passed to us by the caller. We implemented this as a separate private procedure only to make life easier; we want to bind only when the input name is NOT NULL. Rather than perform that check four times in the code for each input parameter, we do it once in this procedure: 7 8 9 10 11 12 13 14 15 procedure bind_variable( p_name in varchar2, p_value in varchar2 ) is begin if ( p_name is not null ) then dbms_sql.bind_variable( g_cursor, p_name, p_value ); end if; end;
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Next is the actual implementation of SUBSTR_OF in the package body. This routine begins with a function declaration from the package specification and the declaration for some local variables. L_BUFFER will be used to return the value, and L_BUFFER_LEN will be used to hold the length returned by an Oracle-supplied function: 16 17 18 19 20 21 22 23 24 25 26 27 28 function substr_of ( p_query in varchar2, p_from in number, p_for in number, p_name1 in varchar2 default p_bind1 in varchar2 default p_name2 in varchar2 default p_bind2 in varchar2 default p_name3 in varchar2 default p_bind3 in varchar2 default p_name4 in varchar2 default p_bind4 in varchar2 default
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
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