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The VARCHAR2 and CHAR types support two methods of specifying lengths: In bytes: VARCHAR2(10 byte). This will support up to 10 bytes of data, which could be as few as two characters in a multibyte character set. Remember that bytes are not the same as characters in a multi-byte character set! In characters: VARCHAR2(10 char). This will support up to 10 characters of data, which could be as much as 40 bytes of information. Furthermore, VARCHAR2(4000 CHAR) would theoretically support up to 4000 characters of data, but since a character string datatype in Oracle is limited to 4000 bytes, you might not be able to achieve the full 4000 characters. See below for an example.

If you are involved in development using EJB, you can use the aspect in listing 6.5 as a template and extend it for other restrictions. Once you have the enforcement aspects ready, you can compile them along with your other classes and watch how much time it saves you in the laborious task of reviewing the code, and how it ensures better quality for your deployed system. Either you will see violations (and then you can fix the problems) or you will see no violations (and you can feel more confident about your code). As an example, consider listing 6.6, which violates some of the EJB programming restrictions.

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It should be noted that we can sort of have our cake and eat it too, here. Using the built-in CAST function, we can perform an on-the-fly conversion of the Oracle NUMBER type to a floatingpoint type, prior to performing the complex math on it. This results in a CPU usage that is much nearer to that of the native floating-point types: select sum(ln(cast( num_type as binary_double ) )) from t call count ------- -----total 4 cpu elapsed -------- ---------0.12 0.17

When using a multibyte character set such as UTF8, you would be well advised to use the CHAR modifier in the VARCHAR2/CHAR definition that is, use VARCHAR2(80 CHAR), not VARCHAR2(80), since your intention is likely to define a column that can in fact store 80 characters of data You may also use the session or system parameter NLS_LENGTH_SEMANTICS to change the default behavior from BYTE to CHAR I do not recommend changing this setting at the system level; rather, use it as part of an ALTER SESSION setting in your database schema installation scripts Any application that requires a database to have a specific set of NLS settings makes for an unfriendly application Such applications generally cannot be installed into a database with other applications that do not desire these settings, but rely on the defaults to be in place.

One other important thing to remember is that the upper bound of the number of bytes stored in a VARCHAR2 is 4,000 However, even if you specify VARCHAR2(4000 CHAR), you may not be able to fit 4,000 characters into that field In fact, you may be able to fit as few as 1,000 characters in that field if all of the characters take 4 bytes to be represented in your chosen character set! The following small example demonstrates the differences between BYTE and CHAR and how the upper bounds come into play We ll create a table with three columns, the first two of which will be 1 byte and one character, respectively, with the last column being 4,000 characters.

This implies that we may store our data very precisely, and when the need for raw speed arises, and the floating-point types significantly outperform the Oracle NUMBER type, we can use the CAST function to accomplish that goal.

package customer; import javax.ejb.*; import javax.naming.*; public abstract class ViolationBean implements EntityBean { private static int _subscriptionCount = 0; // ... public void addSubscription (String subscriptionKey) { try { Context ic = new InitialContext(); // ... } catch (Exception ex) { javax.swing.JOptionPane.showMessageDialog(null, "Exception while adding subscription");

Notice that we re performing this test on a multibyte character set database using the character set AL32UTF8, which supports the latest version of the Unicode standard and encodes characters in a variable length fashion using from 1 to 4 bytes for each character: ops$tkyte@ORA11UTF> select * 2 from nls_database_parameters 3 where parameter = 'NLS_CHARACTERSET'; PARAMETER VALUE ------------------------------ -------------------NLS_CHARACTERSET AL32UTF8 ops$tkyte@ORA11UTF> create table t 2 ( a varchar2(1), 3 b varchar2(1 char), 4 c varchar2(4000 char) 5 ) 6 / Table created Now, if we try to insert into our table a single character that is 2 bytes long in UTF, we observe the following:.

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