org.nkjmlab.sorm4j.context.ColumnValueToJavaObjectConverters Maven / Gradle / Ivy
package org.nkjmlab.sorm4j.context;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* Convert {@link ResultSet} from database to specified objects.
*
* @author nkjm
*/
public interface ColumnValueToJavaObjectConverters {
/**
* Reads a column from the current row in the provided {@link java.sql.ResultSet} and returns an
* instance of the specified Java {@link java.lang.Class} containing the values read.
*
* This method is mainly used for converting the result of query. i.e. Convert from Sql to Java
* by the specified class.
*
*
This method is used while converting {@link java.sql.ResultSet} rows to objects. The class
* type is the field type in the target bean.
*
*
null's will be respected for any non-native types. This means that if a field is of type
* Integer it will be able to receive a null value from the ResultSet; on the other hand, if a
* field is of type int it will receive 0 for a null value from the {@link java.sql.ResultSet}.
*
* @param resultSet {@link java.sql.ResultSet} (positioned in the row to be processed)
* @param columnIndex column index in the result set (starting with 1)
* @param columnType
* @param toType {@link java.lang.Class} of the object to be returned
* @throws SQLException
*/
T convertTo(ResultSet resultSet, int columnIndex, int columnType, Class toType);
/**
* Returns the given type could be converted to Java object or not.
*
* @param objectClass
* @return
*/
boolean isSupportedReturnedType(Class objectClass);
}