mssql_field_length()

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

Get the length of a field

Warning
This function wasREMOVEDin PHP 7.0.0.
Alternatives to this function include:
PDOStatement::getColumnMeta()
sqlsrv_field_metadata()
odbc_field_len()

说明

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

Returns the length of field no.$offsetin$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 ofVARCHARfields is limited to255. If you need to store more data, use aTEXTfield instead.

参见

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

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;

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