mssql_field_length

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

mssql_field_length — Get the length of a field

说明

int mssql_field_length ( resource $result [, int $offset = -1 ] )

Returns the length of field no. offset in result.

参数

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.

返回值

The length of the specified field index on success 或者在失败时返回 FALSE.

范例

Example #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);
?>

以上例程的输出类似于：

The field 'age' has a data length of 4

注释

Note: 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.

参见

mssql_field_name() - Get the name of a field
mssql_field_type() - Gets the type of a field

PHP手册 - N: Get the length of a field

用户评论:

zz(lost dot childz at gmail dot com) (31-Oct-2007 11:41)

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;

(08-Feb-2005 09:56)

You can also work around this limitation with the following: -- for example, with MyVarCharField VARCHAR(1000) SELECT CAST(MyVarCharField AS TEXT) FROM MyTable