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mysqli::use_resultmysqli_use_result
157
• mysqli::use_result
mysqli_use_result
Initiate a result set retrieval
Description
Object oriented style
mysqli_result mysqli::use_result();
Procedural style
mysqli_result mysqli_use_result(
mysqli link);
Used to initiate the retrieval of a result set from the last query executed using the mysqli_real_query
function on the database connection.
Either this or the mysqli_store_result function must be called before the results of a query can be
retrieved, and one or the other must be called to prevent the next query on that database connection from
failing.
Note
The mysqli_use_result function does not transfer the entire result set from
the database and hence cannot be used functions such as mysqli_data_seek
to move to a particular row within the set. To use this functionality, the result
set must be stored using mysqli_store_result. One should not use
mysqli_use_result if a lot of processing on the client side is performed, since
this will tie up the server and prevent other threads from updating any tables from
which the data is being fetched.
Return Values
Returns an unbuffered result object or FALSE if an error occurred.
Examples
Example 3.73 mysqli::use_result 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();
}
$query  = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";
/* execute multi query */
if ($mysqli->multi_query($query)) {
do {
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mysqli::use_resultmysqli_use_result
158
/* store first result set */
if ($result = $mysqli->use_result()) {
while ($row = $result->fetch_row()) {
printf("%s\n", $row[0]);
}
$result->close();
}
/* print divider */
if ($mysqli->more_results()) {
printf("-----------------\n");
}
} while ($mysqli->next_result());
}
/* close connection */
$mysqli->close();
?>
Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query  = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";
/* execute multi query */
if (mysqli_multi_query($link, $query)) {
do {
/* store first result set */
if ($result = mysqli_use_result($link)) {
while ($row = mysqli_fetch_row($result)) {
printf("%s\n", $row[0]);
}
mysqli_free_result($result);
}
/* print divider */
if (mysqli_more_results($link)) {
printf("-----------------\n");
}
} while (mysqli_next_result($link));
}
/* close connection */
mysqli_close($link);
?>
The above examples will output:
my_user@localhost
-----------------
Amersfoort
Maastricht
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mysqli::$warning_countmysqli_warning_count
159
Dordrecht
Leiden
Haarlemmermeer
See Also
mysqli_real_query
mysqli_store_result
3.9.63 mysqli::$warning_countmysqli_warning_count
Copyright 1997-2014 the PHP Documentation Group.
• mysqli::$warning_count
mysqli_warning_count
Returns the number of warnings from the last query for the given link
Description
Object oriented style
int 
mysqli->warning_count ;
Procedural style
int mysqli_warning_count(
mysqli link);
Returns the number of warnings from the last query in the connection.
Note
For retrieving warning messages you can use the SQL command SHOW WARNINGS
[limit row_count].
Parameters
link
Procedural style only: A link identifier returned by mysqli_connect or
mysqli_init
Return Values
Number of warnings or zero if there are no warnings.
Examples
Example 3.74 $mysqli->warning_count example
Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
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mysqli::$warning_countmysqli_warning_count
160
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$mysqli->query("CREATE TABLE myCity LIKE City");
/* a remarkable city in Wales */
$query = "INSERT INTO myCity (CountryCode, Name) VALUES('GBR',
'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')";
$mysqli->query($query);
if ($mysqli->warning_count) {
if ($result = $mysqli->query("SHOW WARNINGS")) {
$row = $result->fetch_row();
printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
$result->close();
}
}
/* close connection */
$mysqli->close();
?>
Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
mysqli_query($link, "CREATE TABLE myCity LIKE City");
/* a remarkable long city name in Wales */
$query = "INSERT INTO myCity (CountryCode, Name) VALUES('GBR',
'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')";
mysqli_query($link, $query);
if (mysqli_warning_count($link)) {
if ($result = mysqli_query($link, "SHOW WARNINGS")) {
$row = mysqli_fetch_row($result);
printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
mysqli_free_result($result);
}
}
/* close connection */
mysqli_close($link);
?>
The above examples will output:
Warning (1264): Data truncated for column 'Name' at row 1
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The mysqli_stmt class
161
See Also
mysqli_errno
mysqli_error
mysqli_sqlstate
3.10 The mysqli_stmt class
Copyright 1997-2014 the PHP Documentation Group.
Represents a prepared statement.
mysqli_stmt {
mysqli_stmt
Properties
int 
mysqli_stmt->affected_rows ;
int 
mysqli_stmt->errno ;
array 
mysqli_stmt->error_list ;
string 
mysqli_stmt->error ;
int 
mysqli_stmt->field_count ;
int 
mysqli_stmt->insert_id ;
int 
mysqli_stmt->num_rows ;
int 
mysqli_stmt->param_count ;
string 
mysqli_stmt->sqlstate ;
Methods
mysqli_stmt::__construct(
mysqli link,
string query);
int mysqli_stmt::attr_get(
int attr);
bool mysqli_stmt::attr_set(
int attr,
int mode);
bool mysqli_stmt::bind_param(
string types,
mixed var1,
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mysqli_stmt::$affected_rowsmysqli_stmt_affected_rows
162
mixed ...);
bool mysqli_stmt::bind_result(
mixed var1,
mixed ...);
bool mysqli_stmt::close();
void mysqli_stmt::data_seek(
int offset);
bool mysqli_stmt::execute();
bool mysqli_stmt::fetch();
void mysqli_stmt::free_result();
mysqli_result mysqli_stmt::get_result();
object mysqli_stmt::get_warnings(
mysqli_stmt stmt);
mixed mysqli_stmt::prepare(
string query);
bool mysqli_stmt::reset();
mysqli_result mysqli_stmt::result_metadata();
bool mysqli_stmt::send_long_data(
int param_nr,
string data);
bool mysqli_stmt::store_result();
}
3.10.1 mysqli_stmt::$affected_rowsmysqli_stmt_affected_rows
Copyright 1997-2014 the PHP Documentation Group.
• mysqli_stmt::$affected_rows
mysqli_stmt_affected_rows
Returns the total number of rows changed, deleted, or inserted by the last executed statement
Description
Object oriented style
int 
mysqli_stmt->affected_rows ;
Procedural style
int mysqli_stmt_affected_rows(
mysqli_stmt stmt);
Returns the number of rows affected by INSERTUPDATE, or DELETE query.
This function only works with queries which update a table. In order to get the number of rows from a
SELECT query, use mysqli_stmt_num_rows instead.
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mysqli_stmt::$affected_rowsmysqli_stmt_affected_rows
163
Parameters
stmt
Procedural style only: A statement identifier returned by
mysqli_stmt_init.
Return Values
An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no
records where updated for an UPDATE/DELETE statement, no rows matched the WHERE clause in the
query or that no query has yet been executed. -1 indicates that the query has returned an error. NULL
indicates an invalid argument was supplied to the function.
Note
If the number of affected rows is greater than maximal PHP int value, the number of
affected rows will be returned as a string value.
Examples
Example 3.75 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();
}
/* create temp table */
$mysqli->query("CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = $mysqli->prepare($query)) {
/* Bind variable for placeholder */
$code = 'A%';
$stmt->bind_param("s", $code);
/* execute statement */
$stmt->execute();
printf("rows inserted: %d\n", $stmt->affected_rows);
/* close statement */
$stmt->close();
}
/* close connection */
$mysqli->close();
?>
Example 3.76 Procedural style
<?php
mysqli_stmt::attr_getmysqli_stmt_attr_get
164
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* create temp table */
mysqli_query($link, "CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = mysqli_prepare($link, $query)) {
/* Bind variable for placeholder */
$code = 'A%';
mysqli_stmt_bind_param($stmt, "s", $code);
/* execute statement */
mysqli_stmt_execute($stmt);
printf("rows inserted: %d\n", mysqli_stmt_affected_rows($stmt));
/* close statement */
mysqli_stmt_close($stmt);
}
/* close connection */
mysqli_close($link);
?>
The above examples will output:
rows inserted: 17
See Also
mysqli_stmt_num_rows
mysqli_prepare
3.10.2 mysqli_stmt::attr_get, mysqli_stmt_attr_get
Copyright 1997-2014 the PHP Documentation Group.
• mysqli_stmt::attr_get
mysqli_stmt_attr_get
Used to get the current value of a statement attribute
Description
Object oriented style
int mysqli_stmt::attr_get(
int attr);
mysqli_stmt::attr_setmysqli_stmt_attr_set
165
Procedural style
int mysqli_stmt_attr_get(
mysqli_stmt stmt,
int attr);
Gets the current value of a statement attribute.
Parameters
stmt
Procedural style only: A statement identifier returned by
mysqli_stmt_init.
attr
The attribute that you want to get.
Return Values
Returns FALSE if the attribute is not found, otherwise returns the value of the attribute.
3.10.3 mysqli_stmt::attr_set, mysqli_stmt_attr_set
Copyright 1997-2014 the PHP Documentation Group.
• mysqli_stmt::attr_set
mysqli_stmt_attr_set
Used to modify the behavior of a prepared statement
Description
Object oriented style
bool mysqli_stmt::attr_set(
int attr,
int mode);
Procedural style
bool mysqli_stmt_attr_set(
mysqli_stmt stmt,
int attr,
int mode);
Used to modify the behavior of a prepared statement. This function may be called multiple times to set
several attributes.
Parameters
stmt
Procedural style only: A statement identifier returned by
mysqli_stmt_init.
attr
The attribute that you want to set. It can have one of the following
values:
Table 3.13 Attribute values
Character
Description
MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH
Setting to TRUE causes
mysqli_stmt_store_result
mysqli_stmt::bind_parammysqli_stmt_bind_param
166
Character
Description
to update the metadata
MYSQL_FIELD->max_length
value.
MYSQLI_STMT_ATTR_CURSOR_TYPE
Type of cursor to open
for statement when
mysqli_stmt_execute
is invoked. mode can be
MYSQLI_CURSOR_TYPE_NO_CURSOR
(the default) or
MYSQLI_CURSOR_TYPE_READ_ONLY.
MYSQLI_STMT_ATTR_PREFETCH_ROWS
Number of rows to fetch from
server at a time when using a
cursor. mode can be in the range
from 1 to the maximum value of
unsigned long. The default is 1.
If you use the MYSQLI_STMT_ATTR_CURSOR_TYPE option with
MYSQLI_CURSOR_TYPE_READ_ONLY, a cursor is opened for the
statement when you invoke mysqli_stmt_execute. If there is
already an open cursor from a previous mysqli_stmt_execute call,
it closes the cursor before opening a new one. mysqli_stmt_reset
also closes any open cursor before preparing the statement for re-
execution. mysqli_stmt_free_result closes any open cursor.
If you open a cursor for a prepared statement,
mysqli_stmt_store_result is unnecessary.
mode
The value to assign to the attribute.
See Also
Connector/MySQL mysql_stmt_attr_set()
3.10.4 mysqli_stmt::bind_parammysqli_stmt_bind_param
Copyright 1997-2014 the PHP Documentation Group.
• mysqli_stmt::bind_param
mysqli_stmt_bind_param
Binds variables to a prepared statement as parameters
Description
Object oriented style
bool mysqli_stmt::bind_param(
string types,
mixed var1,
mixed ...);
Procedural style
bool mysqli_stmt_bind_param(
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