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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); }





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