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mysqli::begin_transactionmysqli_begin_transaction
67
• mysqli::begin_transaction
mysqli_begin_transaction
Starts a transaction
Description
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);
Begins a transaction. Requires MySQL 5.6 and above, and the InnoDB engine (it is enabled by default).
For additional details about how MySQL transactions work, see http://dev.mysql.com/doc/mysql/en/
commit.html.
Parameters
link
Procedural style only: A link identifier returned by mysqli_connect or
mysqli_init
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 CONSISTENT
SNAPSHOT".
name
Savepoint name for the transaction.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example 3.33 $mysqli->begin_transaction example
Object oriented style
<?php
$mysqli = new mysqli("127.0.0.1", "my_user", "my_password", "sakila");
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mysqli::change_usermysqli_change_user
68
if ($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();
?>
Procedural style
<?php
$link = mysqli_connect("127.0.0.1", "my_user", "my_password", "sakila");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
mysqli_begin_transaction($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
mysqli_autocommit
mysqli_commit
mysqli_rollback
3.9.4 mysqli::change_usermysqli_change_user
Copyright 1997-2014 the PHP Documentation Group.
• mysqli::change_user
mysqli_change_user
Changes the user of the specified database connection
Description
Object oriented style
bool mysqli::change_user(
string user,
string password,
string database);
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mysqli::change_usermysqli_change_user
69
Procedural style
bool mysqli_change_user(
mysqli link,
string user,
string password,
string database);
Changes the user of the specified database connection and sets the current database.
In order to successfully change users a valid username and password parameters must be provided and
that user must have sufficient permissions to access the desired database. If for any reason authorization
fails, the current user authentication will remain.
Parameters
link
Procedural style only: A link identifier returned by mysqli_connect or
mysqli_init
user
The MySQL user name.
password
The MySQL password.
database
The database to change to.
If desired, the NULL value may be passed resulting in only changing the
user and not selecting a database. To select a database in this case
use the mysqli_select_db function.
Return Values
Returns TRUE on success or FALSE on failure.
Notes
Note
Using this command will always cause the current database connection to behave
as if was a completely new database connection, regardless of if the operation was
completed successfully. This reset includes performing a rollback on any active
transactions, closing all temporary tables, and unlocking all locked tables.
Examples
Example 3.34 mysqli::change_user example
Object oriented style
<?php
/* connect database test */
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
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mysqli::change_usermysqli_change_user
70
exit();
}
/* Set Variable a */
$mysqli->query("SET @a:=1");
/* reset all and select a new database */
$mysqli->change_user("my_user", "my_password", "world");
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database: %s\n", $row[0]);
$result->close();
}
if ($result = $mysqli->query("SELECT @a")) {
$row = $result->fetch_row();
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
$result->close();
}
/* close connection */
$mysqli->close();
?>
Procedural style
<?php
/* connect database test */
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
mysqli_query($link, "SET @a:=1");
/* reset all and select a new database */
mysqli_change_user($link, "my_user", "my_password", "world");
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database: %s\n", $row[0]);
mysqli_free_result($result);
}
if ($result = mysqli_query($link, "SELECT @a")) {
$row = mysqli_fetch_row($result);
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>
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mysqli::character_set_namemysqli_character_set_name
71
The above examples will output:
Default database: world
Value of variable a is NULL
See Also
mysqli_connect
mysqli_select_db
3.9.5 mysqli::character_set_namemysqli_character_set_name
Copyright 1997-2014 the PHP Documentation Group.
• mysqli::character_set_name
mysqli_character_set_name
Returns the default character set for the database connection
Description
Object oriented style
string mysqli::character_set_name();
Procedural style
string mysqli_character_set_name(
mysqli link);
Returns the current character set for the database connection.
Parameters
link
Procedural style only: A link identifier returned by mysqli_connect or
mysqli_init
Return Values
The default character set for the current connection
Examples
Example 3.35 mysqli::character_set_name example
Object oriented style
<?php
/* Open a connection */
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
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mysqli::$client_infomysqli_get_client_info
72
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Print current character set */
$charset = $mysqli->character_set_name();
printf ("Current character set is %s\n", $charset);
$mysqli->close();
?>
Procedural style
<?php
/* Open a connection */
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Print current character set */
$charset = mysqli_character_set_name($link);
printf ("Current character set is %s\n",$charset);
/* close connection */
mysqli_close($link);
?>
The above examples will output:
Current character set is latin1_swedish_ci
See Also
mysqli_set_charset
mysqli_client_encoding
mysqli_real_escape_string
3.9.6 mysqli::$client_infomysqli_get_client_info
Copyright 1997-2014 the PHP Documentation Group.
• mysqli::$client_info
mysqli_get_client_info
Get MySQL client info
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mysqli::$client_versionmysqli_get_client_version
73
Description
Object oriented style
string 
mysqli->client_info ;
Procedural style
string mysqli_get_client_info(
mysqli link);
Returns a string that represents the MySQL client library version.
Return Values
A string that represents the MySQL client library version
Examples
Example 3.36 mysqli_get_client_info
<?php
/* We don't need a connection to determine
the version of mysql client library */
printf("Client library version: %s\n", mysqli_get_client_info());
?>
See Also
mysqli_get_client_version
mysqli_get_server_info
mysqli_get_server_version
3.9.7 mysqli::$client_version, mysqli_get_client_version
Copyright 1997-2014 the PHP Documentation Group.
• mysqli::$client_version
mysqli_get_client_version
Returns the MySQL client version as a string
Description
Object oriented style
int 
mysqli->client_version ;
Procedural style
int mysqli_get_client_version(
mysqli::closemysqli_close
74
mysqli link);
Returns client version number as an integer.
Return Values
A number that represents the MySQL client library version in format: main_version*10000 +
minor_version *100 + sub_version. For example, 4.1.0 is returned as 40100.
This is useful to quickly determine the version of the client library to know if some capability exists.
Examples
Example 3.37 mysqli_get_client_version
<?php
/* We don't need a connection to determine
the version of mysql client library */
printf("Client library version: %d\n", mysqli_get_client_version());
?>
See Also
mysqli_get_client_info
mysqli_get_server_info
mysqli_get_server_version
3.9.8 mysqli::close, mysqli_close
Copyright 1997-2014 the PHP Documentation Group.
• mysqli::close
mysqli_close
Closes a previously opened database connection
Description
Object oriented style
bool mysqli::close();
Procedural style
bool mysqli_close(
mysqli link);
Closes a previously opened database connection.
Open non-persistent MySQL connections and result sets are automatically destroyed when a PHP script
finishes its execution. So, while explicitly closing open connections and freeing result sets is optional,
mysqli::commitmysqli_commit
75
doing so is recommended. This will immediately return resources to PHP and MySQL, which can improve
performance. For related information, see freeing resources
Parameters
link
Procedural style only: A link identifier returned by mysqli_connect or
mysqli_init
Return Values
Returns TRUE on success or FALSE on failure.
Examples
See mysqli_connect.
Notes
Note
mysqli_close will not close persistent connections. For additional details, see the
manual page on persistent connections.
See Also
mysqli::__construct
mysqli_init
mysqli_real_connect
mysqli_free_result
3.9.9 mysqli::commitmysqli_commit
Copyright 1997-2014 the PHP Documentation Group.
• mysqli::commit
mysqli_commit
Commits the current transaction
Description
Object oriented style
bool mysqli::commit(
int flags,
string name);
Procedural style
bool mysqli_commit(
mysqli link,
int flags,
string name);
Commits the current transaction for the database connection.
Parameters
mysqli::commitmysqli_commit
76
link
Procedural style only: A link identifier returned by mysqli_connect or
mysqli_init
flags
A bitmask of MYSQLI_TRANS_COR_* constants.
name
If provided then COMMIT/*name*/ is executed.
Return Values
Returns TRUE on success or FALSE on failure.
Changelog
Version
Description
5.5.0
Added flags and name parameters.
Examples
Example 3.38 mysqli::commit example
Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$mysqli->query("CREATE TABLE Language LIKE CountryLanguage");
/* set autocommit to off */
$mysqli->autocommit(FALSE);
/* Insert some values */
$mysqli->query("INSERT INTO Language VALUES ('DEU', 'Bavarian', 'F', 11.2)");
$mysqli->query("INSERT INTO Language VALUES ('DEU', 'Swabian', 'F', 9.4)");
/* commit transaction */
if (!$mysqli->commit()) {
print("Transaction commit failed\n");
exit();
}
/* drop table */
$mysqli->query("DROP TABLE Language");
/* close connection */
$mysqli->close();
?>
Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
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