C语言操作Sedna XML数据库

#include "libsedna.h"
#include "stdio.h"

int handle_error(SednaConnection* conn,
                 const char* op,
                 int close_connection) {
    printf("%s failed: \\n%s\\n", op, SEgetLastErrorMsg(conn));
    if(close_connection == 1) SEclose(conn);
    return -1;
}

int main() {
  struct SednaConnection conn = SEDNA_CONNECTION_INITIALIZER;
  int bytes_read, res, value;
  char buf[1024];

  /* Turn off autocommit mode */
  value = SEDNA_AUTOCOMMIT_OFF;
  res = SEsetConnectionAttr(&conn, SEDNA_ATTR_AUTOCOMMIT,
                            (void*)&value, sizeof(int));

  /* Connect to the database */
  res = SEconnect(&conn, "localhost", "test_db",
                  "SYSTEM", "MANAGER");
  if(res != SEDNA_SESSION_OPEN)
    return handle_error(&conn, "Connection", 0);

  /* Begin a new transaction */
  res = SEbegin(&conn);
  if(res != SEDNA_BEGIN_TRANSACTION_SUCCEEDED)
    return handle_error(&conn, "Transaction begin", 1);

  /* Load file "region.xml" into the document "region" */
  res = SEexecute(&conn, "LOAD 'region.xml' 'region'");
  if(res != SEDNA_BULK_LOAD_SUCCEEDED)
    return handle_error(&conn, "Bulk load", 1);

  /* Execute XQuery statement */
  res = SEexecute(&conn, "doc('region')/*/*");
  if(res != SEDNA_QUERY_SUCCEEDED)
    return handle_error(&conn, "Query", 1);

  /* Iterate and print the result sequence */
  while((res = SEnext(&conn)) != SEDNA_RESULT_END) {
    if (res == SEDNA_ERROR)
      return handle_error(&conn, "Getting item", 1);

    do {
      bytes_read = SEgetData(&conn, buf, sizeof(buf) - 1);
      if(bytes_read == SEDNA_ERROR)
        return handle_error(&conn, "Getting item", 1);
      buf[bytes_read] = '\\0';
      printf("%s\\n", buf);
    } while(bytes_read > 0);
  }

  /* Drop document "region" */
  res = SEexecute(&conn, "DROP DOCUMENT 'region'");
  if(res != SEDNA_UPDATE_SUCCEEDED)
    return handle_error(&conn, "Drop document", 1);

  /* Commit transaction */
  res = SEcommit(&conn);
  if(res != SEDNA_COMMIT_TRANSACTION_SUCCEEDED)
    return handle_error(&conn, "Commit", 1);

  /* Close connection */
  res = SEclose(&conn);
  if(res != SEDNA_SESSION_CLOSED)
    return handle_error(&conn, "Close", 0);

  return 0;
}

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