PHP mysqli: begin_transaction() function
mysqli_begin_transaction function / mysqli::begin_transaction
The mysqli_begin_transaction function / mysqli::begin_transaction — Starts a transaction
Syntax:
Object oriented style(method)
public bool mysqli::begin_transaction ([ int $flags [, string $name ]] )
Procedural style
bool mysqli_begin_transaction ( mysqli $link [, int $flags [, string $name ]] )
Usage: Procedural style
begin_transaction ([ int $flags [, string $name ]] );
Parameter:
Name | Description | Required/Optional |
---|---|---|
Link | Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init() | Required for Procedural style and Optional for object oriented style |
flags | Valid flags are: MYSQLI_TRANS_START_READ_ONLY: Start the transaction as "START TRANSACTION READ ONLY". MYSQLI_TRANS_START_READ_WRITE: Start the transaction as "START TRANSACTION READ WRITE". MYSQLI_TRANS_START_WITH_CONSISTENT_SNAPSHOT: Start the transaction as "START TRANSACTION WITH |
Riquired |
name | Savepoint name for the transaction. |
Return value:
Returns TRUE on success or FALSE on failure.
Version: PHP 5, PHP 7
Example of object oriented style:
<?php
$mysqli = new mysqli("localhost", "user1", "datasoft123", "hr");
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}
$mysqli->begin_transaction(MYSQLI_TRANS_START_READ_ONLY);
$mysqli->query("SELECT first_name, last_name FROM actor");
$mysqli->commit();
$mysqli->close();
?>
Example of procedural style:
<?php
$link = mysqli_connect("localhost", "user1", "datasoft123", "hr");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
mysqli_begin_transaction($link, MYSQLI_TRANS_START_READ_ONLY);
mysqli_query($link, "SELECT first_name, last_name FROM actor LIMIT 1");
mysqli_commit($link);
mysqli_close($link);
?>
See also
Previous: autocommit
Next: change_user
PHP: Tips of the Day
var_export(): var_export() dumps a PHP parseable representation of the item.
You can pass true as the second parameter to return the contents into a variable.
Example:
<?php $myarray = [ "PHP", "Tips" ]; $mystring = "PHP Tips"; $myint = 28; var_export($myarray); var_export($mystring); var_export($myint); ?>
Output:
array ( 0 => 'PHP', 1 => 'Tips', )'PHP Tips'28
To put the content into a variable, you can do this:
$array_export = var_export($myarray, true); $string_export = var_export($mystring, true); $int_export = var_export($myint, 1); // any `Truthy` value
After that, you can output it like this:
printf('$myarray = %s; %s', $array_export, PHP_EOL); printf('$mystring = %s; %s', $string_export, PHP_EOL); printf('$myint = %s; %s', $int_export, PHP_EOL);
Example:
<?php $myarray = [ "PHP", "Tips" ]; $mystring = "PHP Tips"; $myint = 28; $array_export = var_export($myarray, true); $string_export = var_export($mystring, true); $int_export = var_export($myint, 1); printf('$myarray = %s; %s', $array_export, PHP_EOL); printf('$mystring = %s; %s', $string_export, PHP_EOL); printf('$myint = %s; %s', $int_export, PHP_EOL); ?>
This will produce the following output:
Output:
$myarray = array ( 0 => 'PHP', 1 => 'Tips', ); $mystring = 'PHP Tips'; $myint = 28;
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