Description:
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For storing unicode text MSSQL has nchar and nvarchar column types 
However, pdo_dblib extension does not correctly escapes unicode strings.

Those strings must be prefixed with N prefix - e.g.
INSERT INTO table(field) (N'unicode_value')
UPDATE table SET field = N'unicode_value' WHERE code = N'unicode_value'

Likewise binary, varbinary and blob should be escaped like unquoted hexadamical notation starting with 0x - e. g.
INSERT INTO table(binfield) (0xAAFFCC)
UPDATE table SET binfield = 0xAAFFCC WHERE code = 0xCCAAFF