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The only danger with the chop function is that it strips the last character from the line, irrespective of what the last character was The chomp function works in combination with the $/ variable when reading from filehandles The $/ variable is the record separator that is attached to the records you read from a filehandle, and it is by default set to the newline character The chomp function works by removing the last character from a string only if it matches the value of $/ To do a safe strip from a record of the record separator character, just use chomp in place of chop:

while(<FH>) { chomp; }

If it were necessary to change the name of a customer, you could do it in both databases concurrently with

This is a much safer option, as it guarantees that the data of a record will remain intact, irrespective of the last character type

perator overloading allows operators to be defined on a class or struct so it can be used with operator syntax. This is most useful on data types where there s a good definition for what a specific operator means, thereby allowing an economy of expression for the user. 29 covers overloading the relational operators (==, !=, >, <, >=, and <=). 25 covers overloading conversion operators.

update customers@prodstore set customer_name='Coda' where customer_id=10; update customers@devstore customer_name='Coda' where customer_id=10; commit;

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Within many programming languages, a string is stored as an array of characters To access an individual character within a string, you need to determine the location of the character within the string and access that element of the array Perl does not support this option, because often you are not working with the individual characters within the string, but the string as a whole Two functions, index and rindex, can be used to find the position of a particular character or string of characters within another string:

index STR, SUBSTR [, POSITION] rindex STR, SUBSTR [, POSITION]

When necessary, Oracle will always implement a two-phase commit to ensure that a distributed transaction (which is a transaction that affects rows in more than one database) is treated as an atomic transaction: the changes must succeed in all databases or be rolled back in all databases Read consistency is also maintained across the whole environment Exercise 4-1: Configure Oracle Net In this exercise, you will set up a complete Oracle Net environment, using graphical and command-line tools Differences between Windows and Linux will be pointed out 1 Create a directory to be used for the Oracle Net configuration files, and set the TNS_ADMIN variable to point to this It doesn t matter where the directory is, as long as the Oracle user has permission to create, read, and write it On Linux:

The index function returns the first position of SUBSTR within the string STR, or it returns 1 if the string cannot be found If the POSITION argument is specified, then the search skips that many characters from the start of the string and starts the search at the next character The rindex function returns the opposite of the index function the last occurrence of SUBSTR in STR, or -1 if the substring could not be found In fact, rindex searches for SUBSTR from the end of STR, instead of the beginning If POSITION is specified, then it starts from that many characters from the end of the string For example:

Ensure that all work from now is done from a session where the variable has been set On Windows:

$string = "The Cat Sat on the print index($string,'cat'); print index($string,'Cat'); print index($string,'Cat',4); print rindex($string,'at'); print rindex($string,'Cat'); Mat"; # Returns -1, because 'cat' is lowercase # Returns 4 # Still returns 4 # Returns 20 # Returns 4

The EXPR is the string that is being extracted from Data is extracted from a starting point of OFFSET characters from the start of EXPR or, if the value is negative, that many characters from the end of the string The optional LENGTH parameter defines the number of characters to be read from the string If it is not specified, then all characters to the end of the string are extracted Alternatively, if the number specified in LENGTH is negative, then that many characters are left off the end of the string For example:

Create and set the key TNS_ADMIN as a string variable in the registry in the Oracle Home branch This will typically be

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