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java.sql.ResultSetMetaData.getColumnLabel和getColumnName的区别

穆风1818 2022-08-25 阅读 38

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.

 Parameters:

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

Returns:

column name

Throws:

​SQLException​​ - if a database access error occurs

 

​​http://blog.sina.com.cn/s/blog_735ef3790100qmf3.html​​ 



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