03-22-2012
Hi, for every line it creates an (associative) array element with field 4 as the index (if it does not exist yet) without a value (or 0 is you will). The exclamation mark negates that value so the outcome is 1 (true). The value of 1 in awk means perform the default action which is {print $0} so the entire line gets printed.
Afterwards the ++ comes into action and 1 is added to the array value, which now becomes 1. So that next time a line with the same value in $4 is encountered the value returned by the array is 1 which is then negated to 0 by the exclamation mark, so nothing will get printed.
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LEARN ABOUT PHP
cubrid_seq_insert
CUBRID_SEQ_INSERT(3) 1 CUBRID_SEQ_INSERT(3)
cubrid_seq_insert - Insert an element to a sequence type column using OID
SYNOPSIS
bool cubrid_seq_insert (resource $conn_identifier, string $oid, string $attr_name, int $index, string $seq_element)
DESCRIPTION
The cubrid_col_insert(3) function is used to insert an element to a sequence type attribute in a requested location.
PARAMETERS
o $conn_identifier
-Connection identifier.
o $oid
-OID of the instance you want to work with.
o $attr_name
-Name of the attribute you want to insert an instance to.
o $index
-Location of the element, you want to insert the element to (1-based).
o $seq_element
-Content of the element that you want to insert.
RETURN VALUES
TRUE, when process is successful.
FALSE, when process is unsuccessful.
EXAMPLES
Example #1
cubrid_seq_insert(3) example
<?php
$conn = cubrid_connect("localhost", 33000, "demodb", "dba");
@cubrid_execute($conn, "DROP TABLE foo");
cubrid_execute($conn, "CREATE TABLE foo(a int AUTO_INCREMENT, b set(int), c sequence(int), d char(10))");
cubrid_execute($conn, "INSERT INTO foo(a, b, c, d) VALUES(1, {1,2,3}, {11,22,33,333}, 'a')");
$req = cubrid_execute($conn, "SELECT * FROM foo", CUBRID_INCLUDE_OID);
cubrid_move_cursor($req, 1, CUBRID_CURSOR_FIRST);
$oid = cubrid_current_oid($req);
$attr = cubrid_col_get($conn, $oid, "c");
var_dump($attr);
cubrid_seq_insert($conn, $oid, "c", 5, "44");
$attr = cubrid_col_get($conn, $oid, "c");
var_dump($attr);
cubrid_close_request($req);
cubrid_disconnect($conn);
?>
The above example will output:
array(4) {
[0]=>
string(2) "11"
[1]=>
string(2) "22"
[2]=>
string(2) "33"
[3]=>
string(3) "333"
}
array(5) {
[0]=>
string(2) "11"
[1]=>
string(2) "22"
[2]=>
string(2) "33"
[3]=>
string(3) "333"
[4]=>
string(2) "44"
}
SEE ALSO
cubrid_seq_drop(3), cubrid_seq_put(3).
PHP Documentation Group CUBRID_SEQ_INSERT(3)