Host Variables may not be used within a batch [SQL Anywhere 12]

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Host Variables may not be used within a batch [SQL Anywhere 12]

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Joseph Campanelli
SnapDevelop
Friday, 14 February 2025 07:12 PM UTC

Hello,

I am trying to create a simple CRUD API for a sample table in my database. When I test with Swagger UI, the Retrieve is successful, however the Create call is sent successfully but the transaction is rolled back with the error "ERROR [HY000] [Sybase][ODBC Driver][SQL Anywhere]Host variables may not be used within a batch". The database uses SQL Anywhere 12, which as stated in the SAP Infocenter, does not support using host variables in batches. The database is supported by Appeon. Looking at the generated SQL in the debug output, I see that both the Retrieve and the Create function use variables though. Is it possible to customize the generated SQL, or to force it to not be sent within a batch? It feels like I must be missing some trivial solution.

The service, controller, and debug output for the Retrieve function:

        public IDataStore RetrieveOne(string bankId)
        {
            IDataStore dataStore = new DataStore("bank_table", _dataContext);
            dataStore.RetrieveByKey(bankId);
            return dataStore;
        }

        //GET api/Bank/RetrieveOne/{BankId}
        [HttpGet("{bankId}")]
        [ProducesResponseType(typeof(Bank), StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status404NotFound)]
        public ActionResult<Bank> RetrieveOne(string bankId)
        {
            IDataStore datastore = _ibankservice.RetrieveOne(bankId);
            if (datastore.RowCount == 0)
            {
                return NotFound();
            }
            return datastore.FirstOrDefault<Bank>();
        }

SQL:

SELECT
 bank_id,
name 
FROM bank 
WHERE (bank_id = ?)

@bank_id = bnk1

The service, controller, and debug output for the Create function:

        public int Create(Bank bank)
        {
            IDataStore dataStore = new DataStore("bank_table", _dataContext) 
            { 
                bank 
            };
            return dataStore.Update();
        }

        //PUT api/Bank/Create
        [HttpPut]
        [ProducesResponseType(StatusCodes.Status201Created)]
        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
        public ActionResult Create([FromBody] Bank bank)
        {
            try
            {
                int count = _ibankservice.Create(bank);
                if (count == 0)
                {
                    return StatusCode(StatusCodes.Status500InternalServerError);
                }
                return Created($"api/Bank/retrieveone/{bank.BankId}", bank);
            }
            catch (Exception ex)
            {
                return StatusCode(StatusCodes.Status500InternalServerError, ex.Message);
            }
        }

SQL:

INSERT INTO bank (bank_id, name)
VALUES (?, ?)
SELECT @@ROWCOUNT



@pp0 = bnk3

@pp1 = Bank Three

Database transaction has been rolled back.

Don't hesitate to ask for additional info in the likely case I've left out something important, and thanks in advance!

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