com.wavemaker.runtime.data.export.nativesql.NativeQueryExtractor Maven / Gradle / Ivy
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* Copyright (C) 2022-2023 WaveMaker, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
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package com.wavemaker.runtime.data.export.nativesql;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.HashMap;
import java.util.Map;
import com.wavemaker.runtime.data.export.QueryExtractor;
import com.wavemaker.runtime.data.transform.WMResultTransformer;
/**
* @author Anusha Dharmasagar
* @since 22/5/17
*/
public class NativeQueryExtractor implements QueryExtractor {
private ResultSet resultSet;
private WMResultTransformer resultTransformer;
private int currentIndex;
public NativeQueryExtractor(
final ResultSet resultSet, final WMResultTransformer resultTransformer) {
this.resultSet = resultSet;
this.resultTransformer = resultTransformer;
}
@Override
public boolean next() throws Exception {
final boolean hasNext = resultSet.next();
this.currentIndex++;
return hasNext;
}
@Override
public boolean isFirstRow() {
//since isFirst() or getRow() methods in java.sql.ResultSet are not supported in few DBs.
return currentIndex == 1;
}
@Override
public Object getCurrentRow() throws Exception {
final ResultSetMetaData metaData = resultSet.getMetaData();
Map columnDataMap = new HashMap<>();
for (int colIndex = 1; colIndex <= metaData.getColumnCount(); colIndex++) {
final String aliasName = metaData.getColumnLabel(colIndex);
final Object value = resultSet.getObject(colIndex);
columnDataMap.put(aliasName, value);
}
return resultTransformer.transformFromMap(columnDataMap);
}
}