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public interface RowCallbackHandler
Callback interface used by JdbcTemplate's query methods. Implementations of this interface perform the actual work of extracting results, but don't need to worry about exception handling. SQLExceptions will be caught and handled correctly by the JdbcTemplate class.
In contrast to a ResultSetExtractor, a RowCallbackHandler object is typically stateful: It keeps the result state within the object, to be available for later inspection. See RowCountCallbackHandler's javadoc for a usage example with JdbcTemplate.
The ResultReader subinterface allows to make a results list available in a uniform manner. JdbcTemplate's query methods will return the results list in that case, else returning null (-> result state is solely available from RowCallbackHandler object).
A convenient out-of-the-box implementation of RowCallbackHandler is the RowMapperResultReader adapter which delegates row mapping to a RowMapper. Note that a RowMapper object is typically stateless and thus reusable; just the RowMapperResultReader adapter is stateful.
ResultSetExtractor
,
RowCountCallbackHandler
,
ResultReader
,
RowMapperResultReader
,
RowMapper
Method Summary | |
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void |
processRow(ResultSet rs)
Implementations must implement this method to process each row of data in the ResultSet. |
Method Detail |
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void processRow(ResultSet rs) throws SQLException
rs
- the ResultSet to process
SQLException
- if a SQLException is encountered getting
column values (that is, there's no need to catch SQLException)
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