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When you create the table that will be used to import the external data, you must define a column to contain the end-of-line (EOL) or newline character if the application that created the file included it. The size of this column must be exactly large enough to contain a particular system s EOL symbol (usually 1 or 2 bytes). For most versions of UNIX, it is 1 byte. For Windows and Macintosh, it is 2 bytes.

Does .NET provide support for COM+ object pooling How do you write a managed class that can take advantage of object pooling

When inserting to an external file, the external function ASCII_CHAR(decimal_ASCII_code) from the ib_udf function library can be used to pass the non-printable characters as an expression to the line-delimiter columns in the SQL statement. For example, the following inserts a carriage return and line feed into a column:

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Figure 10-3. Getting and listing data A special case of pass by value is used for arrays. Arrays can be very large, and in order to improve speed these values are always passed by reference. If the definition is called for pass by value, the array will be copied when the function first attempts to modify the content or data type. This is called copy on write, so if an array is passed by value and the function never changes the content of the array, you have no need to perform the copy. You can define whether a variable is passed by value or reference either in the function definition or when the function is called, as shown in the following example.

INSERT INTO MY_EXT_TABLE ( COLUMNS..., CRLF) VALUES ( column_values..., ASCII_CHAR(13) || ASCII_CHAR(10));

An alternative is to create a table to store any non-printable characters your applications might need to store. Simply create a regular text file on the same platform as the server, using an editor that displays non-printable characters. Open your NPC table using an interactive tool and copy and paste the characters directly to the table.

Object pooling is a COM+ facility that maintains a pool of live objects that are available to serve client requests. As clients request an instance of one of these objects, it is retrieved from the pool and used. This can dramatically improve performance by eliminating the up-front costs of object creation and initialization for every method call. The steps needed to take advantage of object pooling include the following: 1. Add the ObjectPooling attribute to the managed class. 2. Override the CanBePooled method of the base ServicedComponent class to always return true. 3. Design the methods so that they do not hold any client-specific state. The ObjectPooling attribute is added at the class level like this: [ObjectPooling(10,50)] public class MyOPClass : ServicedComponent { } A number of overrides for the ObjectPooling constructor can be used, depending on your needs. The one shown here sets the minimum and maximum number of pooled objects to 10 and 50, respectively. This means that when the COM+ application first starts, 10 copies of this object will be immediately created and placed into the pool. The number 50 specifies the maximum number of class instances that are allowed to exist at any one time.

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For statements performing inserts to the external file, the character can be subqueried from the table.5

< php // Example 10-6-3.php function f1($a) { $a += 4; } function f2(&$a) { $a += 10; } $b = 5; f1(&$b);

Only INSERT and SELECT operations can be performed on the rows of an external table. Attempts to update or delete rows will return errors. Because the data is outside the database, operations on an external table are not under Firebird s record version control. Inserts therefore take effect immediately and cannot be rolled back.

If you want your table to be under transaction control, create another, internal Firebird table, and insert the data from the external table into the internal one.

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