closeStatement

[dmjio]

Fixes for #53 @apkhandkar

[dmjio]

OracleError { 
  oracleErrorFnName = "dpiStmt_bindValueByPos"
  , oracleErrorAction = "check closed"
  , oracleErrorMessage = "DPI-1039: statement was already closed"
  , oracleErrorSqlState = "HY000"
  , oracleErrorCode = 0
  , oracleErrorIsRecoverable = False
  , oracleErrorIsWarning = False
  }