liquibase.executor.jvm.RowCallbackHandler Maven / Gradle / Ivy
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package liquibase.executor.jvm;
import java.sql.ResultSet;
/**
* An interface used by {@link liquibase.executor.Executor} for processing rows of a
* {@link java.sql.ResultSet} on a per-row basis. Implementations of
* this interface perform the actual work of processing each row
* but don't need to worry about exception handling.
* {@link java.sql.SQLException SQLExceptions} will be caught and handled
* by the calling JdbcTemplate.
*
* In contrast to a {@link ResultSetExtractor}, a RowCallbackHandler
* object is typically stateful: It keeps the result state within the
* object, to be available for later inspection.
*
* Consider using a {@link RowMapper} instead if you need to map
* exactly one result object per row, assembling them into a List.
*
* @author Spring Framework
* @see liquibase.executor.Executor
* @see RowMapper
* @see ResultSetExtractor
*/
interface RowCallbackHandler {
/**
* Implementations must implement this method to process each row of data
* in the ResultSet. This method should not call next() on
* the ResultSet; it is only supposed to extract values of the current row.
*
Exactly what the implementation chooses to do is up to it:
* A trivial implementation might simply count rows, while another
* implementation might build an XML document.
*
* @param rs the ResultSet to process (pre-initialized for the current row)
* @throws java.sql.SQLException if a SQLException is encountered getting
* column values (that is, there's no need to catch SQLException)
*/
void processRow(ResultSet rs);
}