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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 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 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 syntax for the binary RAW type is straightforward: RAW( <size> ) For example, the following code creates a table capable of storing 16 bytes of binary information per row: ops$tkyte@ORA11GR2> create table t ( raw_data raw(16) ); Table created The RAW type is much like the VARCHAR2 type in terms of storage on disk The RAW type is a variable length binary string, meaning that the table T just created, for example, may store anywhere from 0 to 16 bytes of binary data It is not padded out like the CHAR type When dealing with RAW data, you will likely find it being implicitly converted to a VARCHAR2 type that is, many tools, such as SQL*Plus, will not display the RAW data directly but will convert it to a hexadecimal format for display.

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In the following example, we create some binary data in our table using SYS_GUID(), a built-in function that returns a 16-byte RAW string that is globally unique (GUID stands for globally unique identifier): ops$tkyte@ORA11GR2> insert into t values ( sys_guid() ); 1 row created ops$tkyte@ORA11GR2> select * from t; RAW_DATA -------------------------------FD1EB03D3718077BE030007F01002FF5 You can immediately note two things here First, the RAW data looks like a character string That is just how SQL*Plus retrieved and printed it; that is not how it is stored on disk SQL*Plus cannot print arbitrary binary data on your screen, as that could have serious side effects on the display Remember that binary data may include control characters such as a carriage return or linefeed or maybe a Ctrl-G character that would cause your terminal to beep.

This is probably over-restrictive because it is OK to access classes such as java.awt.Rectangle. Nevertheless, we would rather err on the side of safety. It is easy to later exclude a few classes from restrictions by modifying the uiCalls() pointcut to not capture the join points for the classes to be excluded. When the aspect detects a violation, it prints a message like the following:

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.

Second, the RAW data looks much larger than 16 bytes in fact, in this example, you can see 32 characters This is due to the fact that every binary byte takes two hexadecimal characters to display The.

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@ORA10G> create or replace package body long_help 2 as 3 4 g_cursor number := dbms_sqlopen_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.

F:\aspectj-book\ch06\section6.5\customer\ViolationBean.java:16 UI calls are not allowed from EJB beans. See EJB 2.0 specification section 24.1.2

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