TRY-CATCH

Purpose:

Executes statement within a block and handles errors.

Syntax:

try {statements1;}

catch {statements2;}

statements1	-	One or more valid expressions separated by semicolons.
statements2	-	One or more valid expressions separated by semicolons.

Returns:

If no error occurs, the routine executes as normal. If an error occurs within the try block, the statements within the catch block are executed.

Example:

trytest(str)

{

local len;

try

{

len = strlen(str);

}

catch

{

len = strlen(caststring(str));

}

return(len);

}

a = trytest("Ten");

b = trytest(10);

a == 3

b == 2

If the input is a string, the function executes as expected. If the input is not a string, the STRLEN function throws an exception that is caught by the catch block. The catch block converts the result to a string and continues processing.

Remarks:

The try-catch clause performs localized exception handling to allow an SPL routine to handle an error and optionally continue processing.

Try-catch clauses may be nested.