wip: extract exception function

- [x] use go style call and check error flow for single SQL_SUCCESS
- [ ] create template for SQL_OK
- [ ] use go style call and check error flow for multiple return codes

src/include/exception.hpp

@@ -0,0 +1,64 @@
+#pragma once
+
+#include "duckdb.hpp"
+#include "duckdb/function/table_function.hpp"
+
+#include "sql.h"
+#include "sqlext.h"
+
+namespace duckdb {
+struct OdbcDiagnostics {
+  std::string msg;
+  std::string state;
+  SQLINTEGER native;
+};
+
+static unique_ptr<OdbcDiagnostics> ExtractDiagnostics(SQLSMALLINT handle_type, SQLHANDLE handle) {
+  SQLINTEGER i = 1;
+  SQLINTEGER native;
+  SQLCHAR state[7];
+  SQLCHAR text[256];
+  SQLSMALLINT len;
+  SQLRETURN return_code;
+  auto diagnostics = make_uniq<OdbcDiagnostics>();
+
+  while (SQL_SUCCEEDED(
+      SQLGetDiagRec(handle_type, handle, i, state, &native, text, sizeof(text), &len))) {
+    diagnostics->msg += string((char *)text);
+    diagnostics->state = string((char *)state);
+    diagnostics->native = native;
+    i++;
+  }
+
+  return std::move(diagnostics);
+}
+
+static std::string SqlReturnCodeToString(SQLRETURN return_code) {
+  switch (return_code) {
+  case SQL_SUCCESS:
+    return "SQL_SUCCESS";
+  case SQL_SUCCESS_WITH_INFO:
+    return "SQL_SUCCESS_WITH_INFO";
+  case SQL_NO_DATA:
+    return "SQL_NO_DATA";
+  case SQL_ERROR:
+    return "SQL_ERROR";
+  case SQL_INVALID_HANDLE:
+    return "SQL_INVALID_HANDLE";
+  case SQL_STILL_EXECUTING:
+    return "SQL_STILL_EXECUTING";
+  case SQL_NEED_DATA:
+    return "SQL_NEED_DATA";
+  default:
+    return "UNKNOWN";
+  }
+}
+
+static void ThrowExceptionWithDiagnostics(std::string msg_prefix, SQLHANDLE handle,
+                                          SQLRETURN return_code) {
+  auto diagnostics = ExtractDiagnostics(SQL_HANDLE_STMT, handle);
+  throw Exception(msg_prefix + " return_code=" + std::to_string(return_code) + ":" +
+                  SqlReturnCodeToString(return_code) + " msg='" + diagnostics->msg + "' state=" +
+                  diagnostics->state + " native=" + std::to_string(diagnostics->native));
+}
+} // namespace duckdb