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always with at least one equal sign, it s not hard to guess that base64 has been used to encode it, and then it is trivial to decode it. So base64 should never be used for serious encryption needs. You may, however, see keys or encrypted data in base64 encoding. Encryption turns data into a completely random string, and the result includes plenty of unprintable characters. This characteristic makes encrypted data unsafe for rendering in an ASCII environment, and it requires you to use a binarysafe column type in order to store it in your database. It is therefore tempting to re-encode the encrypted string as either hexadecimal or base64. Since base64 is only 33% larger than the original encrypted string, it s more efficient than using hexadecimal encoding, which is twice as large.

< xml version="1.0" encoding="UTF-8" > <web-app ...> ... <servlet> <servlet-name>JSF</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>JSF</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> <context-param> <param-name>org.richfaces.SKIN</param-name> <param-value>blueSky</param-value> </context-param> <context-param> <param-name>org.richfaces.CONTROL_SKINNING</param-name> <param-value>enable</param-value> </context-param> <filter> <display-name>RichFaces Filter</display-name> <filter-name>richfaces</filter-name> <filter-class>org.ajax4jsf.Filter</filter-class> </filter> <filter-mapping> <filter-name>richfaces</filter-name> <servlet-name>JSF</servlet-name> <dispatcher>REQUEST</dispatcher> <dispatcher>FORWARD</dispatcher>

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lastname STARTING WITH 'Sm' selects all employees whose family name starts with Sm. This is identical to lastname LIKE 'Sm%'. You can use the logical operators NOT, AND, and OR to build complex conditions. For example, startdate >= '2006-01-01' AND startdate <= '2006-12-31' is equivalent to startdate BETWEEN '2006-01-01' AND '2006-12-31'. To avoid ambiguities, use the parentheses to set the order of execution. For example, lastname CONTAINING 's' OR (lastname CONTAINING 'q' AND lastname NOT CONTAINING 'qu') selects all employees whose family names contain an s or a q, but only if the q is not followed by a u. The statement (lastname CONTAINING 's' OR lastname CONTAINING 'q') AND lastname NOT CONTAINING 'qu' would not select names containing both s and qu. A name such as quasi would be selected by the first condition but not by the second one. As a final remark, you should be aware of the fact that wherever we ve talked about column names, you can also use column numbers. For example, if lastname is the third column of the employee table, lastname = 'Smith' is equivalent to 3 = 'Smith'. However, we encourage you to use column names rather than column positions, which can always change.

The XOR operation is the process of changing the bit-representation of a value according to how each digit of its value compares to each digit of another value. If we have the string hello, for example, we may represent that string by its ASCII values: 104 101 108 108 111. These ASCII numbers may be represented in turn as binary numbers, that is, bits: 01101000 01100111 01110000 01110000 01110011. If we have another string, mbnjq, for example (the simple hash of hello, which we demonstrated earlier), we may similarly represent it as 109 98 110 106 113, or as 01101101 01100010 01101110 01101010 01110001. To XOR these two values, we compare them digit by digit. When either value is true (or 1), we assign a true or 1 value; when both or neither is true, we assign a false or 0 value. So XORing these two values produces the resulting value 00000101 00000101 00011110 00011010 00000010, as we show in Figure 15 1.

You don t need to completely understand the meaning of this code, but basically, it is used to enable RichFaces to intercept requests so that it can deliver JavaScript to the browser. Next, modify listfaq.xhtml as shown in Figure 7 5. In summary, the <a4j:commandLink> is used like a normal <h:commandLink>, but it will generate some JavaScript into the onclick attribute of the HTML link. That JavaScript will call the action method on the server and then rerender the component specified in its reRender attribute.

When designing your database, you have to decide what type of data you need to store in the columns of your tables. SQL supports different data types to store numbers, text, date/time, and unspecified data (called LOB, for large object), as summarized in Listing E-3. Listing E-3. The SQL Data Types <data_type> = {<num_dt> | <datime_dt> | <text_dt> | <lob_dt>}

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