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    mssql_fetch_field

    (PHP 4, PHP 5, PECL odbtp >= 1.1.1)

    mssql_fetch_field — Get field information

    Avertizare

    Această funcție a fost ELIMINATĂ în PHP 7.0.0.

    Variante alternative pentru această funcție sunt:

    Descrierea

    mssql_fetch_field ( resource $result [, int $field_offset = -1 ] ) : object

    mssql_fetch_field() can be used in order to obtain information about fields in a certain query result.

    Parametri

    result

    The result resource that is being evaluated. This result comes from a call to mssql_query().

    field_offset

    The numerical field offset. If the field offset is not specified, the next field that was not yet retrieved by this function is retrieved. The field_offset starts at 0.

    Valorile întoarse

    Returns an object containing field information.

    The properties of the object are:

    • name - column name. if the column is a result of a function, this property is set to computed#N, where #N is a serial number.
    • column_source - the table from which the column was taken
    • max_length - maximum length of the column
    • numeric - 1 if the column is numeric
    • type - the column type.

    Exemple

    Example #1 mssql_fetch_field() example

    <?php
    // Connect to MSSQL and select the database
    mssql_connect('MANGO\SQLEXPRESS', 'sa', 'phpfi');
    mssql_select_db('php');

    // Send a select query to MSSQL
    $query = mssql_query('SELECT * FROM [php].[dbo].[persons]');

    // Construct table
    echo '<h3>Table structure for \'persons\'</h3>';
    echo     '<table border="1">';

    // Table header
    echo '<thead>';
    echo     '<tr>';
    echo     '<td>Field name</td>';
    echo     '<td>Data type</td>';
    echo     '<td>Max length</td>';
    echo     '</tr>';
    echo     '</thead>';

    // Dump all fields
    echo '<tbody>';

    for (    $i = 0; $i < mssql_num_fields($query); ++$i) {
            // Fetch the field information
            $field = mssql_fetch_field($query, $i);

            // Print the row
            echo '<tr>';
        echo     '<td>' . $field->name . '</td>';
        echo     '<td>' . strtoupper($field->type) . '</td>';
        echo     '<td>' . $field->max_length . '</td>';
        echo     '</tr>';
    }

    echo     '</tbody>';
    echo     '</table>';

    // Free the query result
    mssql_free_result($query);
    ?>

    A se vedea și

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    User Contributed Notes 10 notes

    up
    0
    schattenfeld at gmail dot com
    17 years ago
    If you want to describe table like DESCRIBE in MySQL you can use this:
    $sql = <<<SQL
    SELECT column_name,data_type,column_default,is_nullable
    FROM
      information_schema.tables AS t
      JOIN
      information_schema.columns AS c ON
        t.table_catalog=c.table_catalog AND
        t.table_schema=c.table_schema AND
        t.table_name=c.table_name
    WHERE
      t.table_name='TABLE-NAME'
    SQL;
    up
    0
    huszti_dot_roland_at_freemail_dot_com
    18 years ago
    For really detailed table information, use syscolumns, like this:

    SELECT c.name, c.prec, c.scale, t.name type
      FROM syscolumns c, systypes t, sysobjects o
      WHERE o.name = 'yourtablename' AND o.id = c.id AND c.xtype = t.xtype

    For other properties see the MS SQL online help. Search for 'syscolumns'.

    Or an another solution:

    sp_columns @table_name = 'yourtablename', @column_name = 'thecolumnname'
    //no "select ..." !!!!

    This gives info about only the specified column.
    up
    0
    php_rindern_de
    20 years ago
    commenting Reynard Hilman:

    for me it looks like the colstat field value of 1 in syscolumns table indicates an Identity Column.
    up
    0
    Reynard Hilman
    21 years ago
    If you want to describe table structure (like mysql 'desc table' command), sending this query might help:
    <?
    $sql     = "SELECT c.name, c.isnullable, c.length, c.colstat, t.name type
      FROM syscolumns c, systypes t, sysobjects o
      WHERE o.name = '    $table' AND o.id = c.id AND c.xtype = t.xtype";
    ?>
    I suspect the colstat field in syscolumns table indicates primary key when its value is 1
    up
    0
    bmaddy_at_class_dot_umn_dot_edu
    21 years ago
    Be aware that this function will only return the first 30 characters of the name of the column.  If the actual column name is longer, it will be truncated.  This is at least true with the following setup:
    PHP 4.3.1
    MSSQL 8.00.760

    Have a good day everyone!
    Brian
    up
    0
    alonf at spiralsolutions dot com
    21 years ago
    As kubalaa at bigfoot dot com note mssql_fetch_field->column_source return field name instead table name also with MSSQL2000 connection. Be adwised!!!
    up
    -1
    pong at taft dot org
    22 years ago
    When you mssql_fetch_field(int result), you need to do loop to get the name of each field.  Something like:

    while($fld = mssql_fetch_field($rs)){
            echo $fld->name . "<br>";        
        }

    I am wondering why we cannot refer it by a field number.
    up
    -1
    kubalaa at bigfoot dot com
    24 years ago
    Using this function with MSSQL 7, $returned->column_source is the column name, not the table name as it should be.
    up
    -2
    not a mail address
    16 years ago
    kubalaa at bigfoot dot com first reported the problem that column_source contains the FIELD name instead of the source TABLE name 04-Apr-2000 03:58. The bug has been reported as well.

    For those who wonder if it was fixed over the past 8 years: No, the bug still is the same, no workaround available.
    up
    -2
    skipsey at hotmail dot com
    23 years ago
    It seems fairly hard to get a list of the tables from your database using MSSQL but this seems to do the trick. This is set to get only the User Tables and ignores the sytem tables.

    <?php
    mssql_connect    ("server","","") or die ("help me!");
    mssql_select_db("") or die ("Noooo!");

    $result = mssql_query ("sp_tables");
    $fields = mssql_num_fields ($result);
    $rows   = mssql_num_rows ($result);

    for (    $f=0; $f<$rows; $f++) {   
            $CHKTYPE=GetField($result,"TABLE_TYPE",$f);
       
        if(    $CHKTYPE=='TABLE'){

                //$name = mssql_fetch_field($result, 2);
                $field=GetField($result,"TABLE_NAME",$f)."<br>";
            echo     $field;

        }
    }
    ?>
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