mysqli_result::fetch_field

    mysqli_fetch_field

    (PHP 5, PHP 7, PHP 8)

    mysqli_result::fetch_field -- mysqli_fetch_field — Returns the next field in the result set

    Açıklama

    Nesne yönelimli kullanım

    publicmysqli_result::fetch_field(): object|false

    Yordamsal kullanım

    mysqli_fetch_field(mysqli_result$result): object|false

    Returns the definition of one column of a result set as an object. Call this function repeatedly to retrieve information about all columns in the result set.

    Bağımsız Değişkenler

    sonuç

    Sadece yordamsal tarz: mysqli_query(), mysqli_store_result(), mysqli_use_result() veya mysqli_stmt_get_result() işlevinden dönen bir mysqli_result nesnesi.

    Dönen Değerler

    Returns an object which contains field definition information or false if no field information is available.

    Object properties
    PropertyDescription
    nameThe name of the column
    orgnameOriginal column name if an alias was specified
    tableThe name of the table this field belongs to (if not calculated)
    orgtableOriginal table name if an alias was specified
    defUnused. Always an empty string
    dbThe name of the database
    catalogUnused. Always "def"
    max_lengthThe maximum width of the field for the result set. As of PHP 8.1, this value is always 0.
    length The width of the field in bytes. For string columns, the length value varies on the connection character set. For example, if the character set is latin1, a single-byte character set, the length value for a SELECT 'abc' query is 3. If the character set is utf8mb4, a multibyte character set in which characters take up to 4 bytes, the length value is 12.
    charsetnrThe character set number for the field.
    flagsAn integer representing the bit-flags for the field.
    typeThe data type used for this field
    decimalsThe number of decimals for numeric fields, and the fractional seconds precision for temporal fields.

    Örnekler

    Örnek 1 Nesne yönelimli kullanım

    <?php
    $mysqli     = new mysqli("localhost", "my_user", "my_password", "world");


    if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
    }

    $query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";

    if (    $result = $mysqli->query($query)) {


    while ($finfo = $result->fetch_field()) {

    printf("Name: %s\n", $finfo->name);
    printf("Table: %s\n", $finfo->table);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags: %d\n", $finfo->flags);
    printf("Type: %d\n\n", $finfo->type);
    }
    $result->close();
    }


    $mysqli->close();
    ?>

    Örnek 2 Yordamsal kullanım

    <?php
    $link     = mysqli_connect("localhost", "my_user", "my_password", "world");


    if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
    }

    $query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";

    if (    $result = mysqli_query($link, $query)) {


    while ($finfo = mysqli_fetch_field($result)) {

    printf("Name: %s\n", $finfo->name);
    printf("Table: %s\n", $finfo->table);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags: %d\n", $finfo->flags);
    printf("Type: %d\n\n", $finfo->type);
    }
    mysqli_free_result($result);
    }


    mysqli_close($link);
    ?>

    Yukarıdaki örneklerin çıktısı:

    Name: Name Table: Country max. Len: 11 Flags: 1 Type: 254 Name: SurfaceArea Table: Country max. Len: 10 Flags: 32769 Type: 4

    Ayrıca Bakınız

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