抛出异常会挂起流量控制

Question

最近,我一直面临着在JDBC主题中抛出异常的问题.

我使用2个同步方法同步Connection对象:getConnection()和releaseConnection().然后另一个从数据库中删除行的方法如下:

public void removeItem(int itemID) throws ItemNotFound {
    PreparedStatement ps = null;
    String query = "DELETE * FROM Student.Book WHERE id = ?";
    getConnection();
    try {
      ps = con.prepareStatement(query);
      ps.setInt(1, bookID);
      ps.executeUpdate();
    } catch (SQLException sqle) {
      this.close(null, null, ps);  // method to close PreparedStatement and ResultSet
      releaseConnection();
      throw new BookNotFoundException("Book not found!");
    } finally {
      this.close(null, null, ps);
      releaseConnection();
    }
}

如果没有异常发生,一切都很好.如果发生异常,在releaseConnection()方法之后的catch块中,抛出新的BookNotFoundException("找不到书!")挂起!! 如果我评论releaseConnection()方法然后它正常抛出？

Answer 1

releaseConnection();是你的终极和你的捕获.我不认为你想要它在你的阻止块中.