如何在没有ResultSet的情况下获得等效的ResultSetMetaData

问题描述:

我需要将一堆列名解析为列索引(以便使用一些不错的 ResultSetMetaData 方法)。但是,我知道如何获取 ResultSetMetaData 对象的唯一方法是在某些 getMetaData() c $ c> ResultSet 。

I need to resolve a bunch of column names to column indexes (so as to use some of the nice ResultSetMetaData methods). However, the only way that I know how to get a ResultSetMetaData object is by calling getMetaData() on some ResultSet.

我遇到的问题是抓住一个ResultSet占据了我心中不必要的资源 - 我不知道我真的需要查询表中的数据,我只想了解一些关于该表的信息。

The problem I have with that is that grabbing a ResultSet takes up uneccesary resources in my mind - I don't really need to query the data in the table, I just want some information about the table.

有没有人知道如何获得 ResultSetMetaData 对象没有得到 ResultSet (来自可能很大的表)?

Does anyone know of any way to get a ResultSetMetaData object without getting a ResultSet (from a potentially huge table) first?

也许你可以使用

DatabaseMetaData databaseMetaData = connection.getMetaData();
databaseMetaData.getColumns(null, null, tableName, "%");

每个表列返回一行。

在这种情况下,您将使用返回的 ResultSet 本身,而不是其 ResultSetMetaData

In this case you'd use the returned ResultSet itself, not its ResultSetMetaData.

这种方法的一个优点是,它不会干扰数据库锁定和交易。

One advantage of this approach is, that it doesn't interfere with database locking and transactions.