International PHP Conference Berlin 2025

mysqli_stmt::fetch

mysqli_stmt_fetch

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::fetch -- mysqli_stmt_fetchFetch results from a prepared statement into the bound variables

说明

面向对象风格

public mysqli_stmt::fetch(): ?bool

过程化风格

mysqli_stmt_fetch(mysqli_stmt $statement): ?bool

Fetch the result from a prepared statement into the variables bound by mysqli_stmt_bind_result().

注意:

Note that all columns must be bound by the application before calling mysqli_stmt_fetch().

注意:

Data is transferred unbuffered without calling mysqli_stmt_store_result() which can decrease performance (but reduces memory cost).

参数

statement

仅以过程化样式:由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。

返回值

返回值
Value Description
true Success. Data has been fetched
false Error occurred
null No more rows/data exists or data truncation occurred

错误/异常

If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

示例

示例 #1 面向对象风格

<?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 Name, CountryCode FROM City ORDER by ID DESC LIMIT 150,5";

if (
$stmt = $mysqli->prepare($query)) {

/* execute statement */
$stmt->execute();

/* bind result variables */
$stmt->bind_result($name, $code);

/* fetch values */
while ($stmt->fetch()) {
printf ("%s (%s)\n", $name, $code);
}

/* close statement */
$stmt->close();
}

/* close connection */
$mysqli->close();
?>

示例 #2 过程化风格

<?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 Name, CountryCode FROM City ORDER by ID DESC LIMIT 150,5";

if (
$stmt = mysqli_prepare($link, $query)) {

/* execute statement */
mysqli_stmt_execute($stmt);

/* bind result variables */
mysqli_stmt_bind_result($stmt, $name, $code);

/* fetch values */
while (mysqli_stmt_fetch($stmt)) {
printf ("%s (%s)\n", $name, $code);
}

/* close statement */
mysqli_stmt_close($stmt);
}

/* close connection */
mysqli_close($link);
?>

以上示例会输出:

Rockford (USA)
Tallahassee (USA)
Salinas (USA)
Santa Clarita (USA)
Springfield (USA)

参见

添加备注

用户贡献的备注 5 notes

up
19
Bruce Martin
12 years ago
I was trying to use a generic select * from table statment and have the results returned in an array. I finally came up with this solution, others have similar solutions, but they where not working for me.
<?php
//Snip use normal methods to get to this point
$stmt->execute();
$metaResults = $stmt->result_metadata();
$fields = $metaResults->fetch_fields();
$statementParams='';
//build the bind_results statement dynamically so I can get the results in an array
foreach($fields as $field){
if(empty(
$statementParams)){
$statementParams.="\$column['".$field->name."']";
}else{
$statementParams.=", \$column['".$field->name."']";
}
}
$statment="\$stmt->bind_result($statementParams);";
eval(
$statment);
while(
$stmt->fetch()){
//Now the data is contained in the assoc array $column. Useful if you need to do a foreach, or
//if your lazy and didn't want to write out each param to bind.
}
// Continue on as usual.
?>
up
6
dan dot latter at gmail dot com
17 years ago
The following function taken from PHP Cookbook 2, returns an associative array of a row in the resultset, place in while loop to iterate through whole result set.

<?php
public function fetchArray () {
$data = mysqli_stmt_result_metadata($this->stmt);
$fields = array();
$out = array();

$fields[0] = &$this->stmt;
$count = 1;

while(
$field = mysqli_fetch_field($data)) {
$fields[$count] = &$out[$field->name];
$count++;
}

call_user_func_array(mysqli_stmt_bind_result, $fields);
mysqli_stmt_fetch($this->stmt);
return (
count($out) == 0) ? false : $out;

}
?>
up
1
piedone at pyrocenter dot hu
16 years ago
I tried the mentioned stmt_bind_assoc() function, but somehow, very strangely it doesn't allow the values to be written in an array! In the while loop, the row is fetched correctly, but if I write $array[] = $row;, the array will be filled up with the last element of the dataset... Unfortunately I couldn't find a solution.
up
3
Lyndon
16 years ago
This function uses the same idea as the last, but instead binds the fields to a given array.
<?php
function stmt_bind_assoc (&$stmt, &$out) {
$data = mysqli_stmt_result_metadata($stmt);
$fields = array();
$out = array();

$fields[0] = $stmt;
$count = 1;

while(
$field = mysqli_fetch_field($data)) {
$fields[$count] = &$out[$field->name];
$count++;
}
call_user_func_array(mysqli_stmt_bind_result, $fields);
}

// example

$stmt = $mysqli->prepare("SELECT name, userid FROM somewhere");
$stmt->execute();

$row = array();
stmt_bind_assoc($stmt, $row);

// loop through all result rows
while ($stmt->fetch()) {
print_r($row);
}
?>
up
2
andrey at php dot net
19 years ago
IMPORTANT note: Be careful when you use this function with big result sets or with BLOB/TEXT columns. When one or more columns are of type (MEDIUM|LONG)(BLOB|TEXT) and ::store_result() was not called mysqli_stmt_fetch() will try to allocate at least 16MB for every such column. It _doesn't_ matter that the longest value in the result set is for example 30 bytes, 16MB will be allocated. Therefore it is not the best idea ot use binding of parameters whenever fetching big data. Why? Because once the data is in the mysql result set stored in memory and then second time in the PHP variable.
To Top