mysqli_stmt::fetch

mysqli_stmt_fetch

(PHP 5)

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

Description

Object oriented style

bool mysqli_stmt::fetch ( void )

Procedural style

bool mysqli_stmt_fetch ( mysqli_stmt $stmt )

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

Note:

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

Note:

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

Parameters

stmt

Procedural style only: A statement identifier returned by mysqli_stmt_init().

Return Values

Return Values
Value Description
TRUE Success. Data has been fetched
FALSE Error occurred
NULL No more rows/data exists or data truncation occurred

Examples

Example #1 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 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();
?>

Example #2 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 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);
?>

The above examples will output:

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

See Also

Коментарии

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.
2005-04-27 14:37:30
http://php5.kiev.ua/manual/ru/mysqli-stmt.fetch.html
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;

    }
?>
2007-08-16 15:14:55
http://php5.kiev.ua/manual/ru/mysqli-stmt.fetch.html
Автор:
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);
}
?>
2008-04-23 20:38:21
http://php5.kiev.ua/manual/ru/mysqli-stmt.fetch.html
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.
2008-05-08 15:57:59
http://php5.kiev.ua/manual/ru/mysqli-stmt.fetch.html
Автор:
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.
?>
2011-12-30 11:51:38
http://php5.kiev.ua/manual/ru/mysqli-stmt.fetch.html

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