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An unmanaged function can produce and report an error in two ways: Normal error or result codes are returned from the function An unexpected condition occurs and an exception is thrown Most functions provide a reasonable mechanism to determine the success or failure of the function This could take the form of an integer return value, with a zero indicating success and nonzero indicating failure (or vice versa) A function that performs some type of I/O might return a pointer or handle to a file if it is successful, or a null pointer if it has failed Or you might be required to call a second function (ie, GetLastError) to determine the success or failure of the prior function call Regardless of the mechanism used, unmanaged functions should provide a way to determine their success or failure.

Firebird makes available a number of system-maintained variable values in the context of the current client connection and its activity. These context variables are available for use in SQL, including the trigger and stored procedure language, PSQL. Some are available only in PSQL and most are available only in dialect 3 databases. Table 8-1 outlines Firebird s context variables.

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< php // Open the file with the fopen command. The $file variable // holds a handle to the file that will be used when // getting the line from the file. $file = fopen("testfile.txt", "r") or die("Cannot open file!\n"); // this will be false if you can no longer get a line from // the file. while ($line = fgets($file, 1024)) { if (preg_match("/Hello( World!) /", $line)) { echo "Found match: " . $line; } else { echo "No match: " . $line; } } // Make sure to close the file when you are done! fclose($file); > This is the output for the file contents: Hello Goodbye World Hello World Goodbye This is the command output: Found match: Hello No match: Goodbye World Found match: Hello World No match: Goodbye

System ID of the connection that is making this query. Current date on the server s clock. The ROLE name under which the CURRENT_USER is logged in. Returns an empty string if the current login isn t using a role. Current time on the server s clock, expressed as seconds since midnight. Current date and time on the server s clock to the nearest second. System ID of the transaction in which this query is being requested. User name that is communicating through this instance of the client library. Count of rows changed/deleted/added by a DML statement, available when the operation is complete.

Firebird 1.5 onward, DSQL and PSQL Firebird 1.0 onward, all SQL environments Firebird 1.0 onward, all SQL environments

DATE VARCHAR(31)

It is the responsibility of the managed code that makes the call to check the result from the function (in whatever way the function provides) However, this mechanism works only for error conditions that the function expects and successfully handles Exceptional or unexpected conditions often arise, and you need a mechanism to handle them The DLL containing the unmanaged function may be missing The wrong version of the DLL might have been deployed, and the function you are calling has changed or is missing The function may attempt to reference files or directories that are missing Calculations may result in an overflow or divide-by-zero condition Low-memory conditions may cause problems during an unmanaged function call To make it easier to handle these exceptions, NET interop does a good job of turning unmanaged errors into managed exceptions.

This example demonstrates how to open a file, loop through the file line by line, and, while you are looping through it, compare each line to a regular expression to see whether you can find a match. The fopen command opens the file specified by string, which in this case is testfile.txt. The contents of the file are as follows: Hello Goodbye World Hello World Goodbye Once the file is open, use the 20.370 fgets function to get the next line from the file and assign it to a variable ($line). The loop will stop when there are no more lines in the file to get. When you are done processing the file, make sure to close the file with the fclose command.

Firebird 1.0 onward, all SQL environments Firebird 1.5 onward, DSQL and PSQL Firebird 1.0 onward, all SQL environments

VARCHAR(128)

8

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