mysqli_stmt::fetch

    mysqli_stmt_fetch

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::fetch -- mysqli_stmt_fetch — Fetch results from a prepared statement into the bound variables

    Опис

    Об'єктно-орієнтований стиль

    public mysqli_stmt::fetch(): ?bool

    Процедурний стиль

    mysqli_stmt_fetch(mysqli_stmt $statement): ?bool

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

    Зауваження:

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

    Зауваження:

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

    Параметри

    statement

    Тільки процедурний стиль: об'єкт mysqli_stmt, якого повертає функція mysqli_stmt_init().

    Значення, що повертаються

    Значення, що повертаються
    Value Description
    true Success. Data has been fetched
    false Error occurred
    null No more rows/data exists or data truncation occurred

    Помилки/виключення

    Якщо увімкнені звіти про помилки mysqli (MYSQLI_REPORT_ERROR) і запитана операція не виконалась, буде виведено попередження, але якщо встановлено режим MYSQLI_REPORT_STRICT, буде викинуто виключення mysqli_sql_exception.

    Приклади

    Приклад #1 Об'єктно-орієнтований стиль

    <?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();
    ?>

    Приклад #2 Процедурний стиль

    <?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);
    ?>

    Подані вище приклади виведуть:

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    Прогляньте також

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    User Contributed Notes 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.
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