datatype.h

#ifndef __DATATYPE_H_
#define __DATATYPE_H_
#include <string>
//#include "Data.h"
const int ValueLen(4), ChildLen(3), OffsetLen(4), LeafLen(7), IntLen(5), FloatLen(10);
const int Int(0), Float(1), Char_n(2);    //put in IndexManager.cpp
const int DataFile(0), IndexFile(1);
const int Greater(1), NotLess(2), Less(3), NotGreater(4);

//struct blockInfo;
//struct fileInfo {
//    int type;                   // 0-> data file
//                                // 1 -> index file
//    std::string fileName;            // the name of the file
//    int recordAmount;           // the number of record in the file
//    int freeNum;                // the free block number which could be used for the file
//    int recordLength;           // the length of the record in the file
//    fileInfo *next;             // the pointer points to the next file
//    blockInfo *firstBlock;      // point to the first block within the file
//};
//
//struct blockInfo {
//    int blockNum;               // the block number of the block, which indicate it when it be newed
//    bool dirtyBit;              // 0 -> flase
//                                // 1 -> indicate dirty, write back
//    blockInfo *prev;            // the pointer point to previous block
//    blockInfo *next;            // the pointer point to next block
//    fileInfo *file;             // the pointer point to the file, which the block belongs to
//    int charNum;                // the number of chars in the block
//    char *cBlock;               // the array space for storing the records in the block in buffer
//    int iTime;                  // it indicate the age of the block in use
//    int lock;                   // prevent the block from replacing
//};

//10.31
struct blockInfo;
struct fileInfo {
    int type;
    std::string fileName;
    int recordAmount;
    int freeNum;
    int recordLength;
    fileInfo *next;
    blockInfo *firstBlock;
};

struct blockInfo {
    int blockNum;
    bool dirtyBit;
    blockInfo *prev;
    blockInfo *next;
    fileInfo *file;
    int charNum;
    char *cBlock;
    int iTime;
    int lock;
};


struct index_info {
    std::string index_name;     //the name of the index file
    int length;                 //the length of the value
    char type;                  //the type of the value
                                //0---int,1---float,2----char(n)    
    long offset;                //the record offset in the table file
    std::string value;          //the value

    //10.27 add by hedejin
    //11.10 commented by bingzhangdai, in order of debugging
    index_info(){}
    // index_info(const std::string& name,const Field& f, const char *_value) {
    //     index_name = name + "_" + f.name;
    //     length = f.length;
    //     type = f.type;
    //     value = _value;
    // }
};


#endif