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Impelements jdbc interface for DolphinDB base on java api
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package com.dolphindb.jdbc;

import com.xxdb.data.BasicArrayVector;
import com.xxdb.data.BasicEntityFactory;
import com.xxdb.data.Entity;
import com.xxdb.data.Vector;

import java.util.ArrayList;
import java.util.List;

public class ColumnBindValue implements Comparable {
	/**
	 *  current column index
	 */
	private int index;

	/**
	 * current column name
	 */
	private String colName;

	/**
	 * current column type
	 */
	private Entity.DATA_TYPE type;

	/**
	 * actual values would be inserted
	 */
	private Vector bindValues;

//	/** has this parameter been set? */
//	private boolean isSet;  // check by bindValues size

	/**
	 * scale of Decimal
	 */
	private int scale = 0;

	public ColumnBindValue(int index, String colName, Entity.DATA_TYPE type, int scale) {
		this.index = index;
		this.colName = colName;
		this.type = type;
		this.scale = scale;
		if (type.getValue() >= 65)
			this.bindValues = new BasicArrayVector(type, 0, scale);
		else
			this.bindValues = BasicEntityFactory.instance().createVectorWithDefaultValue(type, 0, scale);
	}

	int getIndex() {
		return index;
	}

	Vector getBindValues() {
		return bindValues;
	}

	String getColName() {
		return colName;
	}

	Entity.DATA_TYPE getType() {
		return type;
	}

	void clear() {
		if (type.getValue() >= 65){
			this.bindValues = new BasicArrayVector(type, 0, scale);
		} else {
			this.bindValues = BasicEntityFactory.instance().createVectorWithDefaultValue(type, 0, scale);
		}
	}

//	boolean isSet() {
//		return isSet;
//	}

	void setIndex(int index) {
		this.index = index;
	}

	void setColName(String colName) {
		this.colName = colName;
	}

	void setType(Entity.DATA_TYPE type) {
		this.type = type;
	}

//	void setSet(boolean set) {
//		isSet = set;
//	}

	public int getScale() {
		return scale;
	}

	public void setScale(int scale) {
		this.scale = scale;
	}

	@Override
	public int compareTo(ColumnBindValue o) {
		return this.index - o.index;
	}
}


class BindValue {
	/**
	 * The value to store
	 */
	private Object value;

	private boolean isNull;

	BindValue(Object value,boolean isNull) {
		this.value = value;
		this.isNull = isNull;
	}

	public Object getValue() {
		return value;
	}

	public void setValue(Object value) {
		this.value = value;
	}


	public boolean isNull() {
		return this.isNull;
	}
}