mssql_field_length
(PHP 4, PHP 5, PECL odbtp >= 1.1.1)
mssql_field_length — Get the length of a field
Описание
$result
[, int $offset = -1
] )
Returns the length of field no. offset in
result.
Список параметров
-
result -
The result resource that is being evaluated. This result comes from a call to mssql_query().
-
offset -
The field offset, starts at 0. If omitted, the current field is used.
Возвращаемые значения
The length of the specified field index on success или FALSE в случае возникновения ошибки.
Примеры
Пример #1 mssql_field_length() 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
$query = mssql_query('SELECT [name], [age] FROM [php].[dbo].[persons]');
// Print the field length
echo 'The field \'age\' has a data length of ' . mssql_field_length($query, 1);
// Free the query result
mssql_free_result($query);
?>
Результатом выполнения данного примера будет что-то подобное:
The field 'age' has a data length of 4
Примечания
Замечание: Note to Windows Users
Due to a limitation in the underlying API used by PHP (MS DBLib C API), the length of VARCHAR fields is limited to 255. If you need to store more data, use a TEXT field instead.
Смотрите также
- mssql_field_name() - Get the name of a field
- mssql_field_type() - Gets the type of a field
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- Microsoft SQL Server
- mssql_bind
- mssql_close
- mssql_connect
- mssql_data_seek
- mssql_execute
- mssql_fetch_array
- mssql_fetch_assoc
- mssql_fetch_batch
- mssql_fetch_field
- mssql_fetch_object
- mssql_fetch_row
- mssql_field_length
- mssql_field_name
- mssql_field_seek
- mssql_field_type
- mssql_free_result
- mssql_free_statement
- mssql_get_last_message
- mssql_guid_string
- mssql_init
- mssql_min_error_severity
- mssql_min_message_severity
- mssql_next_result
- mssql_num_fields
- mssql_num_rows
- mssql_pconnect
- mssql_query
- mssql_result
- mssql_rows_affected
- mssql_select_db
Коментарии
You can also work around this limitation with the following:
-- for example, with MyVarCharField VARCHAR(1000)
SELECT CAST(MyVarCharField AS TEXT) FROM MyTable
there are same problem with VARBINARY, if you are forced to use existing database with such fields you can do it like this:
SELECT CAST(master.dbo.fn_varbintohexstr(VARBINARYFIELD) AS TEXT) FROM table;