T
- the result type@FunctionalInterface public interface RowMapper<T>
JdbcTemplate
for mapping rows of a
ResultSet
on a per-row basis. Implementations of this
interface perform the actual work of mapping each row to a result object,
but don't need to worry about exception handling.
SQLExceptions
will be caught and handled
by the calling JdbcTemplate.
Typically used either for JdbcTemplate
's query methods
or for out parameters of stored procedures. RowMapper objects are
typically stateless and thus reusable; they are an ideal choice for
implementing row-mapping logic in a single place.
Alternatively, consider subclassing
MappingSqlQuery
from the
jdbc.object
package: Instead of working with separate
JdbcTemplate and RowMapper objects, you can build executable query
objects (containing row-mapping logic) in that style.
JdbcTemplate
,
RowCallbackHandler
,
ResultSetExtractor
,
MappingSqlQuery
Modifier and Type | Method and Description |
---|---|
T |
mapRow(ResultSet rs,
int rowNum)
Implementations must implement this method to map each row of data
in the ResultSet.
|
@Nullable T mapRow(ResultSet rs, int rowNum) throws SQLException
next()
on
the ResultSet; it is only supposed to map values of the current row.rs
- the ResultSet to map (pre-initialized for the current row)rowNum
- the number of the current rownull
)SQLException
- if an SQLException is encountered getting
column values (that is, there's no need to catch SQLException)