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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.vdb;

import java.sql.Timestamp;

import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.dm.Table;
import com.scudata.expression.Expression;

/**
 * ???ݿ????ӽӿ?
 * @author RunQian
 *
 */
public interface IVS {
	/**
	 * ȡ???Ӷ?Ӧ?ĸ?????
	 * @return VDB
	 */
	VDB getVDB();
	
	/**
	 * ȡ???ӵĵ?ǰ??
	 * @return ISection
	 */
	ISection getHome();
	
	// 
	/**
	 * ???õ?ǰ·??????????д??????????ڴ?·??
	 * @param path
	 * @return IVS
	 */
	IVS home(Object path);
	
	/**
	 * ???ص?ǰ·??
	 * @param opt
	 * @return Object
	 */
	Object path(String opt);

	/**
	 * ??ס??ǰ·??
	 * @param opt ѡ?r??????·???򶼼?д????u??????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int lock(String opt);
	
	/**
	 * ??סָ??·??
	 * @param path ·????·??????
	 * @param opt ѡ?r??????·???򶼼?д????u??????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int lock(Object path, String opt);
	
	/**
	 * ?г???ǰ·???µ????ļ??????س?????
	 * @param opt ѡ?d???г???Ŀ¼??w?????????ļ???Ŀ¼ȫ???г???l???ȼ???
	 * @return Sequence
	 */
	Sequence list(String opt);
	
	/**
	 * ?г?ָ??·???µ????ļ??????س?????
	 * @param path ·????·??????
	 * @param opt ѡ?d???г???Ŀ¼??w?????????ļ???Ŀ¼ȫ???г???l???ȼ???
	 * @return Sequence
	 */
	Sequence list(Object path, String opt);
	
	/**
	 * ????ǰ??????????
	 * @param opt ѡ?l???ȼ???
	 * @return Object
	 */
	Object load(String opt);
	
	/**
	 * ??ָ??·???ı?????????
	 * @param path ·????·??????
	 * @param opt ѡ?l???ȼ???
	 * @return Object
	 */
	Object load(Object path, String opt);
	
	/**
	 * ????·?????????ύʱ??
	 * @return Timestamp
	 */
	Timestamp date();

	/**
	 * ??????д?뵽??ǰ????
	 * @param value ????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int save(Object value);
	
	/**
	 * ??????д?뵽ָ??·???ı???
	 * @param value ????
	 * @param path ·????·??????
	 * @param name ·??????·????????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int save(Object value, Object path, Object name);

	/**
	 * ??????ǰ·???????а???ָ???ֶεı?????????
	 * @param fields ?ֶ???????
	 * @return ???
	 */
	Table importTable(String []fields);
	
	 /**
	  *  ??????ǰ·???????а???ָ???ֶεı?????????
	  * @param fields ?ֶ???????
	  * @param filters ???˱???ʽ????
	  * @param ctx ??????????
	  * @return ???
	  */
	Table importTable(String []fields, Expression []filters, Context ctx);
	
	/**
	 * ???ѡ??Ϊ????ɾ???ڵ㣬???ѡ??Ϊ??e????ɾ?????µĿ??ӽڵ?
	 * @param opt e??ֻɾ?????µĿսڵ?
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int delete(String opt); // ɾ????
	
	/**
	 * ???ѡ??Ϊ????ɾ???ڵ㣬???ѡ??Ϊ??e????ɾ?????µĿ??ӽڵ?
	 * @param path ·????·??????
	 * @param opt e??ֻɾ?????µĿսڵ?
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int delete(Object path, String opt); // ɾ????
	
	/**
	 * ɾ?????
	 * @param paths
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int deleteAll(Sequence paths);
	
	/**
	 * ?ƶ?Ŀ¼??ָ??Ŀ¼
	 * @param srcPath Դ·????·??????
	 * @param destPath Ŀ??·????·??????
	 * @param name Ŀ??·??????·????????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int move(Object srcPath, Object destPath, Object name);
	
	/**
	 * ????Ŀ¼
	 * @param path ·????·??????
	 * @param name ·??????·????????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int makeDir(Object path, Object name);
	
	/**
	 * ?????ݿ??ж?ȡ?????ֶ?׷?ӵ?ָ????????
	 * @param seq ????
	 * @param pathExp ·??????ʽ
	 * @param fields Ҫ??ȡ???ֶ???????
	 * @param filter ???˱???ʽ
	 * @param ctx ??????????
	 * @return ????????
	 */
	Table read(Sequence seq, Expression pathExp, String []fields, Expression filter, Context ctx);
	
	/**
	 * ?????е?ָ???ֶ?д?뵽????
	 * @param seq ????
	 * @param pathExp ·??????ʽ
	 * @param fieldExps ?ֶ?ֵ????ʽ????
	 * @param fields ?ֶ???????
	 * @param filter ???˱???ʽ
	 * @param ctx ??????????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int write(Sequence seq, Expression pathExp, Expression []fieldExps, 
			String []fields, Expression filter, Context ctx);

	/**
	 * ????????????????
	 * @param dirNames ·????????
	 * @param dirValues ·??ֵ???飬???ڹ???
	 * @param valueSigns true????Ŀ¼??????????ʱ????????Ŀ¼ֵ??null?????ѡֵ??null??Ŀ¼??false??ʡ??Ŀ¼ֵ???????Դ?Ŀ¼??????
	 * @param fields ??????Ҫ?????ֶ???????
	 * @param filter ????????
	 * @param opt ѡ?r????ȥ????·????ȱʡ?????????????漰?㼴ֹͣ
	 * @param ctx ??????????
	 * @return ?????????
	 */
	Sequence retrieve(String []dirNames, Object []dirValues, boolean []valueSigns,
			String []fields, Expression filter, String opt, Context ctx);
	
	/**
	 * ?ҳ??????????ĵ??ݺ??д???ݵ??ֶ?ֵ
	 * @param dirNames ·????????
	 * @param dirValues ·??ֵ???飬???ڹ???
	 * @param valueSigns true????Ŀ¼??????????ʱ????????Ŀ¼ֵ??null?????ѡֵ??null??Ŀ¼??false??ʡ??Ŀ¼ֵ???????Դ?Ŀ¼??????
	 * @param fvals ?????е??ֶ?ֵ????
	 * @param fields ?????е??ֶ???????
	 * @param filter ????????
	 * @param opt ѡ?r????ȥ????·????ȱʡ?????????????漰?㼴ֹͣ
	 * @param ctx ??????????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int update(String []dirNames, Object []dirValues, boolean []valueSigns, 
			Object []fvals, String []fields, Expression filter, String opt, Context ctx);
	
	/**
	 * ???渽????ͨ????ͼƬ
	 * @param oldValues ??һ?ε??ôκ????ķ???ֵ
	 * @param newValues ?޸ĺ??ֵ
	 * @param path ·????·??????
	 * @param name ·??????·????????
	 * @return ֵ???У???????һ?ε??ô˺???
	 */
	Sequence saveBlob(Sequence oldValues, Sequence newValues, Object path, String name);
	
	/**
	 * ????????·????
	 * @param ·????·??????
	 * @param ·??????·????????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int rename(Object path, String name);
	
	/**
	 * ?鵵ָ??·?????鵵??·????????д??ռ?õĿռ???С????ѯ?ٶȻ???
	 * @param path ·????·??????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int archive(Object path);
	
	/**
	 * ????·????ָ??·????
	 * @param destPath Ŀ??·????·??????
	 * @param destName Ŀ??·??????·????????
	 * @param src Դ???ݿ?????
	 * @param srcPath Դ·????·??????
	 * @return ?ɹ???VDB.S_SUCCESS????????ʧ??
	 */
	int copy(Object destPath, Object destName, IVS src, Object srcPath);
}