11-06-2007
RE: Mysql CHAR vs VARCHAR
Actually a VARCHAR(10) will only allow up to 10 characters and no more.
The main difference between CHAR and VARCHAR is how data is stored in the column. The length of a CHAR column is fixed and when CHAR values are stored, they are right-padded with spaces to the specified length. In contrast to CHAR, VARCHAR values are stored using only as many characters as are needed.
Please see the MySQL docs for more details:
MySQL AB :: MySQL 5.0 Reference Manual :: 10.4.1 The CHAR and VARCHAR Types
Cheers!
Nate
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LEARN ABOUT PHP
cubrid_rollback
CUBRID_ROLLBACK(3) 1 CUBRID_ROLLBACK(3)
cubrid_rollback - Roll back a transaction
SYNOPSIS
bool cubrid_rollback (resource $conn_identifier)
DESCRIPTION
The cubrid_rollback(3) function executes rollback on the transaction pointed by $conn_identifier, currently in progress.
Connection to server is closed after calling cubrid_rollback(3). Connection handle, however, is still valid.
PARAMETERS
o $conn_identifier
-Connection identifier.
RETURN VALUES
TRUE, when process is successful.
FALSE, when process is unsuccessful.
EXAMPLES
Example #1
cubrid_rollback(3) example
<?php
$conn = cubrid_connect("127.0.0.1", 33000, "demodb", "dba");
cubrid_set_autocommit($conn,false);
@cubrid_execute($conn, "DROP TABLE publishers");
$sql = <<<EOD
CREATE TABLE publishers(
pub_id CHAR(3),
pub_name VARCHAR(20),
city VARCHAR(15),
state CHAR(2),
country VARCHAR(15)
)
EOD;
if (!cubrid_execute($conn, $sql)) {
printf("Error facility: %d
Error code: %d
Error msg: %s
", cubrid_error_code_facility(), cubrid_error_code(), cubrid_error_msg());
cubrid_disconnect($conn);
exit;
}
$req = cubrid_prepare($conn, "INSERT INTO publishers VALUES(?, ?, ?, ?, ?)");
$id_list = array("P01", "P02", "P03", "P04");
$name_list = array("Abatis Publishers", "Core Dump Books", "Schadenfreude Press", "Tenterhooks Press");
$city_list = array("New York", "San Francisco", "Hamburg", "Berkeley");
$state_list = array("NY", "CA", NULL, "CA");
$country_list = array("USA", "USA", "Germany", "USA");
for ($i = 0, $size = count($id_list); $i < $size; $i++) {
cubrid_bind($req, 1, $id_list[$i]);
cubrid_bind($req, 2, $name_list[$i]);
cubrid_bind($req, 3, $city_list[$i]);
cubrid_bind($req, 4, $state_list[$i]);
cubrid_bind($req, 5, $country_list[$i]);
if (!($ret = cubrid_execute($req))) {
break;
}
}
if (!$ret) {
cubrid_rollback($conn);
} else {
cubrid_commit($conn);
$req = cubrid_execute($conn, "SELECT * FROM publishers");
while ($result = cubrid_fetch_assoc($req)) {
printf("%-3s %-20s %-15s %-3s %-15s
",
$result["pub_id"], $result["pub_name"], $result["city"], $result["state"], $result["country"]);
}
}
cubrid_disconnect($conn);
?>
The above example will output:
P01 Abatis Publishers New York NY USA
P02 Core Dump Books San Francisco CA USA
P03 Schadenfreude Press Hamburg Germany
P04 Tenterhooks Press Berkeley CA USA
SEE ALSO
cubrid_commit(3), cubrid_disconnect(3).
PHP Documentation Group CUBRID_ROLLBACK(3)