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filespec is the fully qualified local path and file specification for the external data file. The file need not exist at the time the table is created. However, from Firebird 1.5 onward, the CREATE statement will fail if the filespec refers to an unconfigured external file location. See the section Securing External Files later in this chapter and the configuration section in 36. columndef is an ordinary Firebird column definition. Non-character data types can be specified, provided every string extracted from the column s location in the external record is capable of being cast implicitly to that type. line_delimiter is an optional final column or pair of columns that can be defined to read the characters used by the file system to mark the end of a line of text. Although it makes reading the file easier for humans, it is not a requirement in a fixed-format record unless programs that are going to read the data require it. On Linux/UNIX, this is the single character ASCII 10, the line feed character. On Windows, it is the ordered pair ASCII 13 (carriage return) followed by ASCII 10.

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The real advantage of JIT activation is that it allows you to conserve resources on the server without drastically changing how you code the client. The client is allowed to create an instance of an object and hold on to that reference for as long as necessary. Without JIT activation, this would unnecessarily tie up server resources. But with JIT activation, the server resources are freed for you automatically. JIT activation does not necessarily improve performance. On the contrary, there is actually a slight performance hit when the reactivation of an object occurs. But JIT activation does improve scalability by reducing resource usage on the server.

array( COLUMN_NAME COLUMN_TYPE ), array( COLUMN_NAME COLUMN_TYPE )

On Mac OS, it is ASCII 10 followed by ASCII 13. Other operating systems may use other variations or other characters.

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With all versions of Firebird, a list of directories can be configured to restrict the locations where Firebird will search for or create external files. See 3 for the configuration parameters ExternalFileAccess in firebird.conf (for v. 1.5 servers) or external_file_directory in ibconfig/isc_config (for v. 1.0.x). By default, Firebird 1.5 is installed with no access to external files, whereas 1.0.x gives open access to any file in the local filesystem.

The method of configuration and the capability to protect the system from malicious attack via external file access differ between server versions.

); $data = array( array("John", "Smith", 55), array("Mike", "Johnson", 33), array("Susan", "Donovan", 29), array("King", "Tut", 3346) ); return sizeof($data); } function ListData($data, $meta) { echo "<table border=1>"; foreach($data as $row) { echo "<tr>"; foreach($row as $col=>$cell) { switch ($meta[$col][COLUMN_TYPE]) { case COLUMN_STRING : echo "<td align=left>$cell</td>"; break; case COLUMN_INTEGER : echo "<td align=right>" . number_format($cell) . "</td>"; break; } } echo "</tr>"; } echo "</table>"; } $d = array(); $m = array(); if (GetData($d, $m)) { ListData($d, $m); } >

Firebird will create the external file itself if it does not find it in the location specified in the CREATE EXTERNAL TABLE '<filespec>' specification. If the file already exists, each record must be of fixed length, consisting of fixed-length fields that exactly match the byte length of the column specifications in the table definition. If the application that created the file uses hard line breaks (e.g., the 2-byte carriage return and line break sequence in Windows text files), include a column to accommodate this sequence. See the upcoming section titled End-of-Line Characters. BLOB and ARRAY data cannot be read from or written to an external file. Most well-formed number data can be read directly from an external table and, in most cases, Firebird will be able to use its internal casting rules to interpret it correctly. However, it may be easier and more precise to read the numbers into character columns and, later, convert them using the CAST(..) function.

See recipes 8-2 (Implementing a Server Application), 8-6 (Using Object Pooling), and 9-2 (Enabling Automatic Transactions).

Make sure you allow enough width to accommodate your data. For some guidelines on sizes, refer to the relevant chapter in Part Three. Figure 8-1 in 8 summarizes the rules for data type conversions.

Using VARCHAR in the column definition of an external string field is not recommended because it is not a readily portable format:

You define the two variables $d and $m. Both are assigned the value of empty arrays. The call to GetData() defines the content of the two variables passed by reference. The two variables are then passed to the ListData() function, which generates an HTML table showing the values, as shown in Figure 10-3.

VARCHAR requires the initial 2-byte unsigned short to include the number of bytes in the actual string, and the string immediately follows.4 This is difficult or impossible for many external applications to achieve and it simply is not worth the trouble. For this reason, favor CHAR over VARCHAR for string fields and ensure that the feeding application pads the strings to full length.

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