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How can you deal with a bunch of character data that you have stored using the wrong character set The trick is to use character set OCTETS as a staging post between the wrong and the right encoding. Because OCTETS is a special character set that blindly stores only what you poke into it without transliteration it is ideal for making the character codes neutral with respect to code page. For example, suppose your problem table has a column COL_ORIGINAL that you accidentally created in character set NONE, when you meant it to be CHARACTER SET ISO8859_2. You have been loading this column with Hungarian data, but every time you try to select from it, you get that darned transliteration error. Here s what you can do:

< php // Example 10-5-2.php $a = 7; function test() { global $a; $a = 20; } test(); echo "\$a = $a\n"; >

ALTER TABLE TABLEA ADD COL_IS08859_2 VARCHAR(30) CHARACTER SET IS08859_2; COMMIT; UPDATE TABLEA SET COL_IS08859_2 = CAST(COL_ORIGINAL AS CHAR(30) CHARACTER SET OCTETS);

Now you have a temporary column designed to store Hungarian text and it is storing all of your lost text from the unusable COL_ORIGINAL. You can proceed to drop COL_ORIGINAL, and then add a new COL_ORIGINAL having the correct character set. Simply copy the data from the temporary column and, after committing, drop the temporary column:

See recipes 8-3 (Installing a Serviced Component), 8-1 (Exposing Managed Code to COM+), and 8-2 (Implementing a Server Application).

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ALTER TABLE TABLEA DROP COL_ORIGINAL; COMMIT; ALTER TABLE TABLEA ADD COL_ORIGINAL VARCHAR(30) CHARACTER SET IS08859_2; COMMIT; UPDATE TABLEA SET COL_ORIGINAL = COL_ISO8859_2; COMMIT; /* It would be wise to view your data now! */ ALTER TABLE TABLEA DROP COL_ISO8859_2; COMMIT;

The only change from the previous example is the line global a$; inside the function. This line makes the two variables reference the same memory, so when you change the value inside the function, you also change the value of the variable in the global scope. $a = 20 The other way of accessing global variables is by using the true global or superglobal variable called $GLOBALS. This is an associative array that is available in any scope, and it has references to all variables defined in the global scope.

11

When a client application, such as isql, connects to a database, it is part of its connection protocol to inform the server of its character set requirements. The character set for a connection is the character set neutral NONE, unless specified otherwise using SET NAMES in embedded applications or in isql. The isc_dpb_lc_ctype parameter of the database parameter block (DPB) for the isc_attach_database() function of the API. RAD database connection classes for Delphi, Java, et al. generally surface this parameter as a property. The client application specifies its character set before it connects to the database. For example, the following ISQL command specifies that isql is using the ISO8859_1 character set. The next command connects to the authors.fdb database of our earlier example:

SET NAMES ISO8859_1; CONNECT 'lserver:/data/authors.fdb' USER 'ALICE' PASSWORD 'XINEOHP';

COM+ supports just-in-time (JIT) activation to improve the use of resources on the server. Is this option supported from managed code How do you implement a .NET component that uses JIT activation

< php // Example 10-5-3.php $a = 7; function test() { $GLOBALS['a'] = 20; } test(); echo "\$a = $a\n"; >

The general rule for character sets is that every byte (or pair or trio, in the case of multibyte sets) is specifically defined by the standard it implements. There are four special exceptions NONE, OCTETS, ASCII, and UNICODE_FSS. Table 11-1 explains the special qualities of these sets.

Each byte is part of a string, but no assumption is made about which character set it belongs to. Client-side or user-defined server code is responsible for character fidelity. Bytes that will not be interpreted as characters. Useful for storing binary data. Values 0 . . . 127 are defined by ASCII; values outside that range are not characters, but are preserved. Firebird is fairly liberal about transliterating bytes in the 0 . . . 127 range of ASCII characters. Developers need to know that it is effectively a UTF8 implementation. Users need to know that it can be used to store UCS16 but not UCS32 characters (that would take up to 6 bytes per character). No collation sequence other than the default binary one is available.

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