java.sql.ResultSetMetaData.getColumnLabel和getColumnName的区别

如果将ResultSet的结果映射到HashMap中，要使用getColumnLabel，而不要用getColumnName，这样可提高程序的健壮性

理由：

getColumnName返回的是sql语句中field的原始名字。

getColumnLabel是field的SQL AS的值（Alias--别名）。

比如：select

          a.name as name,

          a.description as description,

          b.description as relatedDescription

         from a,b where ...

此时,getColumnName(3) == "description";而getColumnLabel(3) == "relatedDescription"。

API:

getColumnLabel

String getColumnLabel(int column)
                      throws SQLException      

Gets the designated column's suggested title for use in printouts and displays. The suggested title is usually specified by the SQL

AS

clause. If a SQL

AS

is not specified, the value returned from

getColumnLabel

will be the same as the value returned by the

getColumnName

method.

Parameters:

column

- the first column is 1, the second is 2, ...

Returns:

the suggested column title

Throws:

SQLException

- if a database access error occurs

getColumnName

String getColumnName(int column)
                     throws SQLException      

Get the designated column's name.

column

column name

SQLException