fix(ODBC): Poco:Data::ODBC - MSSQL (n)varchar(max) length issue #4324

[aleks-f]

No description provided.

[aleks-f]

@aleks-f

• add dynamic detection of the back end; indiscriminate use of SQLServer extensions obviously causes problems with other back ends:

  Requested SQL statement: INSERT INTO Person VALUES (?,?,?,?)
  Native SQL statement: INSERT INTO Person VALUES (?,?,?,?)
  : Connection:localhost:1521/XE
  Server:Not applicable
  ===========================
  ODBC Diagnostic record #1:
  ===========================
  SQLSTATE = 22001
  Native Error Code = 24152841
  [Devart][ODBC]String data, right-truncated
  

@cunj123

• please add MS SQLServer libs in the CI environment ODBC job, so this takes effect there:
  

  poco/Data/ODBC/include/Poco/Data/ODBC/ODBC.h

  Line 58 in 6e09ec2

  #if __has_include(<msodbcsql.h>)

  I tested locally on Debian12 and this should be sufficient to find the header:
  

  poco/Data/ODBC/ODBC.make

  Line 9 in 6e09ec2

  POCO_ODBC_INCLUDE = /usr/include

@matejk

• cmake build
  equivalent of this

[cunj123]

@aleks-f the sql server odbc driver is already being installed in the odbc job https://github.com/pocoproject/poco/blob/4324-varchar-length/.github/workflows/ci.yml#L765

[matejk]

Code changes seem OK to me. I just have comments whether it shall be possible to configure MSSQL specialities in CMake also.