java.sql.ResultSetMetaData.getColumnLabel和getColumnName的区别
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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 SQLAS
is not specified, the value returned fromgetColumnLabel
will be the same as the value returned by thegetColumnName
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
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