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IndexManager.cpp
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IndexManager.cpp
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#include "IndexManager.h"
IndexManager::IndexManager()
{
fileName = "";
indexFileName = "";
configFileName = "";
root = -1;
}
IndexManager::~IndexManager()
{
if (fileName != "")
emptyBplusTree();
// cout << "~IndexManager()" << endl;
// flushAll();
}
void IndexManager::showCurrentTree()
{
cout << "fileName: " << fileName << endl;
cout << "indexFileName: " << indexFileName << endl;
cout << "configFileName: " << configFileName << endl;
cout << "root: " << root << endl;
}
int IndexManager::createBplusTree(TargetInt t)
{
if (fileName != "")
emptyBplusTree();
string name = t.indexFileName;
string iName = name + ".index";
string cName = name + ".config";
/* if (_access(iName.c_str(), F_OK) == 0)
{
cout << "The index file has already existed!" << endl;
return -1;
}*/
{
FILE* BFile;
FILE* configFile;
fileName = name;
indexFileName = iName;
configFileName = cName;
emptyNodeList ENL1 = { 1, 0 };
bufferNode& temp_bf = getBlock(INDEX, configFileName, 0);
temp_bf.writeBlock(ENL1, sizeof(emptyNodeList), 0);
emptyNodeList ENL2 = { 0, 1, 0 };
bufferNode& temp_bf2 = getBlock(INDEX, configFileName, 1);
temp_bf2.writeBlock(ENL2, sizeof(emptyNodeList), 0);
root = 1;
BplusNodeInt r = { 0 };
r.nkey = 0;
r.isleaf = true;
writeBplusNode(root, r);
rootTable[fileName] = root;
return 0;
}
}
int IndexManager::createBplusTree(TargetFloat t)
{
if (fileName != "")
emptyBplusTree();
string name = t.indexFileName;
string iName = name + ".index";
string cName = name + ".config";
fileName = name;
indexFileName = iName;
configFileName = cName;
emptyNodeList ENL1 = { 1, 0 };
bufferNode& temp_bf = getBlock(INDEX, configFileName, 0);
temp_bf.writeBlock(ENL1, sizeof(emptyNodeList), 0);
emptyNodeList ENL2 = { 0, 1, 0 };
bufferNode& temp_bf2 = getBlock(INDEX, configFileName, 1);
temp_bf2.writeBlock(ENL2, sizeof(emptyNodeList), 0);
root = 1;
BplusNodeFloat r = { 0 };
r.nkey = 0;
r.isleaf = true;
writeBplusNode(root, r);
rootTable[fileName] = root;
return 0;
}
int IndexManager::createBplusTree(TargetChar t)
{
if (fileName != "")
emptyBplusTree();
string name = t.indexFileName;
string iName = name + ".index";
string cName = name + ".config";
fileName = name;
indexFileName = iName;
configFileName = cName;
emptyNodeList ENL1 = { 1, 0 };
bufferNode& temp_bf = getBlock(INDEX, configFileName, 0);
temp_bf.writeBlock(ENL1, sizeof(emptyNodeList), 0);
emptyNodeList ENL2 = { 0, 1, 0 };
bufferNode& temp_bf2 = getBlock(INDEX, configFileName, 1);
temp_bf2.writeBlock(ENL2, sizeof(emptyNodeList), 0);
root = 1;
BplusNodeChar r = { 0 };
r.nkey = 0;
r.isleaf = true;
writeBplusNode(root, r);
rootTable[fileName] = root;
return 0;
}
void IndexManager::emptyBplusTree()
{
if (fileName != "")
{
bufferNode& temp_bf = getBlock(INDEX, configFileName, 0);
temp_bf.writeBlock(root, sizeof(ADDRESS), 0);
rootTable[fileName] = root;
}
fileName = "";
indexFileName = "";
configFileName = "";
root = -1;
}
int IndexManager::switchBplusTree(string name)
{
if (fileName != name)
{
emptyBplusTree();
if (rootTable.count(name) == 1)
{
fileName = name;
indexFileName = name + ".index";
configFileName = name + ".config";
root = rootTable[fileName];
return 0;
}
else
{
string iName = name + ".index";
if (_access(iName.c_str(), F_OK) == 0)
{
fileName = name;
indexFileName = iName;
configFileName = name + ".config";
bufferNode& temp_bf = getBlock(INDEX, configFileName, 0);
temp_bf.readBlock(root, sizeof(ADDRESS), 0);
rootTable[fileName] = root;
return 0;
}
else
{
cout << "The index file dose not exist!" << endl;
return -1;
}
}
}
else
return 0;
}
void IndexManager::readBplusNode(ADDRESS add, BplusNodeInt& node)
{
if (add <= 0)
{
cerr << "the node you are to read dose not exist!" << endl;
cout << "node ID: " << add;
cout << "file name: " << fileName;
}
else
{
bufferNode& temp_bf = getBlock(INDEX, indexFileName, add - 1);
temp_bf.readBlock(node, sizeof(BplusNodeInt), 0);
}
}
void IndexManager::readBplusNode(ADDRESS add, BplusNodeFloat& node)
{
if (add <= 0)
{
cerr << "the node you are to read dose not exist!" << endl;
cout << "node ID: " << add;
cout << "file name: " << fileName;
}
else
{
bufferNode& temp_bf = getBlock(INDEX, indexFileName, add - 1);
temp_bf.readBlock(node, sizeof(BplusNodeFloat), 0);
}
}
void IndexManager::readBplusNode(ADDRESS add, BplusNodeChar& node)
{
if (add <= 0)
{
cerr << "the node you are to read dose not exist!" << endl;
cout << "node ID: " << add;
cout << "file name: " << fileName;
}
else
{
bufferNode& temp_bf = getBlock(INDEX, indexFileName, add - 1);
temp_bf.readBlock(node, sizeof(BplusNodeChar), 0);
}
}
void IndexManager::writeBplusNode(ADDRESS add, BplusNodeInt& node)
{
if (add <= 0)
{
cerr << "the node you are to write dose not exist!" << endl;
cout << "node ID: " << add;
cout << "file name: " << fileName;
}
else
{
bufferNode& temp_bf = getBlock(INDEX, indexFileName, add - 1);
temp_bf.writeBlock(node, sizeof(BplusNodeInt), 0);
}
}
void IndexManager::writeBplusNode(ADDRESS add, BplusNodeFloat& node)
{
if (add <= 0)
{
cerr << "the node you are to write dose not exist!" << endl;
cout << "node ID: " << add;
cout << "file name: " << fileName;
}
else
{
bufferNode& temp_bf = getBlock(INDEX, indexFileName, add - 1);
temp_bf.writeBlock(node, sizeof(BplusNodeFloat), 0);
}
}
void IndexManager::writeBplusNode(ADDRESS add, BplusNodeChar& node)
{
if (add <= 0)
{
cerr << "the node you are to write dose not exist!" << endl;
cout << "node ID: " << add;
cout << "file name: " << fileName;
}
else
{
bufferNode& temp_bf = getBlock(INDEX, indexFileName, add - 1);
temp_bf.writeBlock(node, sizeof(BplusNodeChar), 0);
}
}
void IndexManager::insertBplusTree(TargetInt& tar)
{
BplusNodeInt r;
readBplusNode(root, r);
if (r.nkey == MAX_INT)
{
BplusNodeInt newRoot;
newRoot.nkey = 0;
newRoot.isleaf = false;
newRoot.Pointer[0] = root;
splitBplusNodeInt(newRoot, r, 0);
writeBplusNode(root, r);
root = newBplusNode();
writeBplusNode(root, newRoot);
//分裂根节点
}
insertKey(root, tar);
}
void IndexManager::insertBplusTree(TargetFloat& tar)
{
BplusNodeFloat r;
readBplusNode(root, r);
if (r.nkey == MAX_FLOAT)
{
BplusNodeFloat newRoot;
newRoot.nkey = 0;
newRoot.isleaf = false;
newRoot.Pointer[0] = root;
splitBplusNodeFloat(newRoot, r, 0);
writeBplusNode(root, r);
root = newBplusNode();
writeBplusNode(root, newRoot);
//分裂根节点
}
insertKey(root, tar);
}
void IndexManager::insertBplusTree(TargetChar& tar)
{
BplusNodeChar r;
readBplusNode(root, r);
if (r.nkey == MAX_CHAR)
{
BplusNodeChar newRoot;
newRoot.nkey = 0;
newRoot.isleaf = false;
newRoot.Pointer[0] = root;
splitBplusNodeChar(newRoot, r, 0);
writeBplusNode(root, r);
root = newBplusNode();
writeBplusNode(root, newRoot);
//分裂根节点
}
insertKey(root, tar);
}
void IndexManager::insertKey(ADDRESS current, TargetInt& tar)
{
BplusNodeInt x;
readBplusNode(current, x);
int i;
for (i = 0; i < x.nkey && x.key[i] < tar.key; i++);
if (i < x.nkey && x.isleaf && x.key[i] == tar.key) //在B+树叶节点找到了相同关键字
{
//关键字插入重复
cerr << "The key '" << tar.key << "' has already existed in the index!" << endl;
return;
}
if (!x.isleaf) //如果不是叶节点
{
BplusNodeInt y;
readBplusNode(x.Pointer[i], y);
if (y.nkey == MAX_INT) //如果x的子节点已满，则这个子节点分裂
{
splitBplusNodeInt(x, y, i);
writeBplusNode(current, x);
writeBplusNode(x.Pointer[i], y);
}
if (tar.key <= x.key[i] || i == x.nkey)
{
insertKey(x.Pointer[i], tar);
}
else
{
insertKey(x.Pointer[i + 1], tar);
}
}
else //如果是叶节点,则直接将关键字插入key数组中
{
for (int j = x.nkey; j > i; j--)
{
x.key[j] = x.key[j - 1];
x.Pointer[j] = x.Pointer[j - 1];
}
x.key[i] = tar.key;
x.nkey++;
//将记录的地址赋给x.Pointer[i]
x.Pointer[i] = tar.index.offset + (tar.index.num << 12);
writeBplusNode(current, x);
}
}
void IndexManager::insertKey(ADDRESS current, TargetFloat& tar)
{
BplusNodeFloat x;
readBplusNode(current, x);
int i;
for (i = 0; i < x.nkey && x.key[i] < tar.key; i++);
if (i < x.nkey && x.isleaf && x.key[i] == tar.key) //在B+树叶节点找到了相同关键字
{
//关键字插入重复
cerr << "The key '" << tar.key << "' has already existed in the index!" << endl;
return;
}
if (!x.isleaf) //如果不是叶节点
{
BplusNodeFloat y;
readBplusNode(x.Pointer[i], y);
if (y.nkey == MAX_FLOAT) //如果x的子节点已满，则这个子节点分裂
{
splitBplusNodeFloat(x, y, i);
writeBplusNode(current, x);
writeBplusNode(x.Pointer[i], y);
}
if (tar.key <= x.key[i] || i == x.nkey)
{
insertKey(x.Pointer[i], tar);
}
else
{
insertKey(x.Pointer[i + 1], tar);
}
}
else //如果是叶节点,则直接将关键字插入key数组中
{
for (int j = x.nkey; j > i; j--)
{
x.key[j] = x.key[j - 1];
x.Pointer[j] = x.Pointer[j - 1];
}
x.key[i] = tar.key;
x.nkey++;
//将记录的地址赋给x.Pointer[i]
x.Pointer[i] = tar.index.offset + (tar.index.num << 12);
writeBplusNode(current, x);
}
}
void IndexManager::insertKey(ADDRESS current, TargetChar& tar)
{
BplusNodeChar x;
readBplusNode(current, x);
int i;
for (i = 0; i < x.nkey && toString(x.key[i]) < tar.key; i++);
if (i < x.nkey && x.isleaf && toString(x.key[i]) == tar.key) //在B+树叶节点找到了相同关键字
{
//关键字插入重复
cerr << "The key '" << tar.key << "' has already existed in the index!" << endl;
return;
}
if (!x.isleaf) //如果不是叶节点
{
BplusNodeChar y;
readBplusNode(x.Pointer[i], y);
if (y.nkey == MAX_CHAR) //如果x的子节点已满，则这个子节点分裂
{
splitBplusNodeChar(x, y, i);
writeBplusNode(current, x);
writeBplusNode(x.Pointer[i], y);
}
if (tar.key <= toString(x.key[i]) || i == x.nkey)
{
insertKey(x.Pointer[i], tar);
}
else
{
insertKey(x.Pointer[i + 1], tar);
}
}
else //如果是叶节点,则直接将关键字插入key数组中
{
for (int j = x.nkey; j > i; j--)
{
// x.key[j] = x.key[j-1] ;
memcpy(x.key[j], x.key[j - 1], 255);
x.Pointer[j] = x.Pointer[j - 1];
}
// x.key[i] = tar.key;
memcpy(x.key[i], tar.key.c_str(), tar.key.length());
x.key[i][tar.key.length()] = '\0';
x.nkey++;
//将记录的地址赋给x.Pointer[i]
x.Pointer[i] = tar.index.offset + (tar.index.num << 12);
writeBplusNode(current, x);
}
}
void IndexManager::splitBplusNodeInt(BplusNodeInt &father, BplusNodeInt ¤t, const int childnum)
{
int half = MAX_INT / 2;
int i;
for (i = father.nkey; i > childnum; i--)
{
father.key[i] = father.key[i - 1];
father.Pointer[i + 1] = father.Pointer[i];
}
father.nkey++;
BplusNodeInt t;
ADDRESS address = newBplusNode();
father.key[childnum] = current.key[half];
father.Pointer[childnum + 1] = address;
for (i = half + 1; i < MAX_INT; i++)
{
t.key[i - half - 1] = current.key[i];
t.Pointer[i - half - 1] = current.Pointer[i];
}
t.nkey = MAX_INT - half - 1;
t.Pointer[t.nkey] = current.Pointer[MAX_INT];
t.isleaf = current.isleaf;
current.nkey = half;
if (current.isleaf) //如果当前被分裂节点是叶子
{
current.nkey++;
t.Pointer[MAX_INT] = current.Pointer[MAX_INT];
current.Pointer[MAX_INT] = address;
}
writeBplusNode(address, t);
}
void IndexManager::splitBplusNodeFloat(BplusNodeFloat &father, BplusNodeFloat ¤t, const int childnum)
{
int half = MAX_FLOAT / 2;
int i;
for (i = father.nkey; i > childnum; i--)
{
father.key[i] = father.key[i - 1];
father.Pointer[i + 1] = father.Pointer[i];
}
father.nkey++;
BplusNodeFloat t;
ADDRESS address = newBplusNode();
father.key[childnum] = current.key[half];
father.Pointer[childnum + 1] = address;
for (i = half + 1; i < MAX_FLOAT; i++)
{
t.key[i - half - 1] = current.key[i];
t.Pointer[i - half - 1] = current.Pointer[i];
}
t.nkey = MAX_FLOAT - half - 1;
t.Pointer[t.nkey] = current.Pointer[MAX_FLOAT];
t.isleaf = current.isleaf;
current.nkey = half;
if (current.isleaf) //如果当前被分裂节点是叶子
{
current.nkey++;
t.Pointer[MAX_FLOAT] = current.Pointer[MAX_FLOAT];
current.Pointer[MAX_FLOAT] = address;
}
writeBplusNode(address, t);
}
void IndexManager::splitBplusNodeChar(BplusNodeChar &father, BplusNodeChar ¤t, const int childnum)
{
int half = MAX_CHAR / 2;
int i;
for (i = father.nkey; i > childnum; i--)
{
// father.key[i] = father.key[i-1] ;
memcpy(father.key[i], father.key[i - 1], 255);
father.Pointer[i + 1] = father.Pointer[i];
}
father.nkey++;
BplusNodeChar t;
ADDRESS address = newBplusNode();
// father.key[childnum] = current.key[half] ;
memcpy(father.key[childnum], current.key[half], 255);
father.Pointer[childnum + 1] = address;
for (i = half + 1; i < MAX_CHAR; i++)
{
// t.key[i-half-1] = current.key[i] ;
memcpy(t.key[i - half - 1], current.key[i], 255);
t.Pointer[i - half - 1] = current.Pointer[i];
}
t.nkey = MAX_CHAR - half - 1;
t.Pointer[t.nkey] = current.Pointer[MAX_CHAR];
t.isleaf = current.isleaf;
current.nkey = half;
if (current.isleaf) //如果当前被分裂节点是叶子
{
current.nkey++;
t.Pointer[MAX_CHAR] = current.Pointer[MAX_CHAR];
current.Pointer[MAX_CHAR] = address;
}
writeBplusNode(address, t);
}
int IndexManager::newBplusNode()
{
bufferNode& temp_bf = getBlock(INDEX, configFileName, 0);
emptyNodeList overview;
temp_bf.readBlock(overview, sizeof(emptyNodeList), 0);
int page;
for (page = 0; page < BLOCK_SIZE / sizeof(int)-1; page++)
if (overview.isUsed[page] == 0)
break;
if (page == BLOCK_SIZE / sizeof(int)-1)
{
cout << "The index file is full!" << endl;
return -1;
}
else
{
bufferNode& temp_bf2 = getBlock(INDEX, configFileName, page + 1);
emptyNodeList ENL;
temp_bf2.readBlock(ENL, sizeof(emptyNodeList), 0);
int block;
for (block = 0; block < BLOCK_SIZE / sizeof(int)-1; block++)
if (ENL.isUsed[block] == 0)
break;
ENL.isUsed[block] = 1;
if (block == (BLOCK_SIZE / sizeof(int)-2))
{
overview.isUsed[page] = 1;
temp_bf.writeBlock(overview, sizeof(emptyNodeList), 0);
}
temp_bf2.writeBlock(ENL, sizeof(emptyNodeList), 0);
return page*(BLOCK_SIZE / sizeof(int)-1) + block + 1;
}
}
void IndexManager::enumLeafKey(TargetInt tar)
{
BplusNodeInt head;
readBplusNode(root, head);
while (!head.isleaf)
{
readBplusNode(head.Pointer[0], head);
}
while (1)
{
for (int i = 0; i < head.nkey; i++)
{
cout << "key = " << head.key[i];
cout << "block num = " << (head.Pointer[i] >> 12);
cout << "offset = " << toOffset(head.Pointer[i]) << endl;
}
if (head.Pointer[MAX_INT] == 0)
break;
readBplusNode(head.Pointer[MAX_INT], head);
}
}
void IndexManager::enumLeafKey(TargetFloat tar)
{
BplusNodeFloat head;
readBplusNode(root, head);
while (!head.isleaf)
{
readBplusNode(head.Pointer[0], head);
}
while (1)
{
for (int i = 0; i < head.nkey; i++)
{
printf("key = %f block num = %d offset = %d\n", head.key[i], head.Pointer[i] >> 12, toOffset(head.Pointer[i]));
// cout << "key = " << head.key[i];
// cout << "block num = " << (head.Pointer[i]>>12);
// cout << "offset = " << toOffset(head.Pointer[i]) << endl;
}
if (head.Pointer[MAX_FLOAT] == 0)
break;
readBplusNode(head.Pointer[MAX_FLOAT], head);
}
}
void IndexManager::enumLeafKey(TargetChar tar)
{
BplusNodeChar head;
readBplusNode(root, head);
while (!head.isleaf)
{
readBplusNode(head.Pointer[0], head);
}
// unsigned int temp;
while (1)
{
for (int i = 0; i < head.nkey; i++)
{
// printf("key = %s block num = %d offset = %d\n",head.key[i], head.Pointer[i]>>12, toOffset(head.Pointer[i]) );
//cout << "key = " << head.key[i];
cout << "key = " << head.key[i];
cout << " block num = " << (head.Pointer[i] >> 12);
cout << " offset = " << toOffset(head.Pointer[i]) << endl;
}
if (head.Pointer[MAX_CHAR] == 0)
break;
readBplusNode(head.Pointer[MAX_CHAR], head);
}
}
vector<index_info> IndexManager::searchBplusTree(TargetInt& tar, ADDRESS& resultAdd)
{
int i;
int flagNode = -1, flagIndex = -1;
vector<index_info> result;
index_info result_temp;
ADDRESS current = root;
ADDRESS leafNode;
BplusNodeInt a;
do
{
leafNode = current; //record the node ID of the leaf node
readBplusNode(current, a);
for (i = 0; i < a.nkey && tar.key > a.key[i]; i++);
if (i < a.nkey && a.isleaf && tar.key == a.key[i]) //在B+树叶节点找到了等值的关键字
{
resultAdd = current; //返回该关键字所对应的记录的地址
if (tar.type == SINGLE)
{
result_temp.num = a.Pointer[i] >> 12;
result_temp.offset = toOffset(a.Pointer[i]);
result.push_back(result_temp);
}
else if (tar.type == NOTLARGER)
{
flagIndex = i;
flagNode = current;
}
else if (tar.type == LARGER)
{
i++;
}
}
current = a.Pointer[i];
} while (!a.isleaf);
if (tar.type == NOTLESS || tar.type == LARGER)
{
for (; i < a.nkey; i++)
{
result_temp.num = a.Pointer[i] >> 12;
result_temp.offset = toOffset(a.Pointer[i]);
result.push_back(result_temp);
}
while (i == a.nkey && a.Pointer[MAX_INT] > 0)
{
current = a.Pointer[MAX_INT];
readBplusNode(current, a);
for (i = 0; i < a.nkey; i++)
{
result_temp.num = a.Pointer[i] >> 12;
result_temp.offset = toOffset(a.Pointer[i]);
result.push_back(result_temp);
}
}
}
else if (tar.type == NOTLARGER || tar.type == LESS)
{
if (flagIndex < 0)
{
flagNode = leafNode;
flagIndex = i - 1;
}
BplusNodeInt head;
ADDRESS headNode = root;
readBplusNode(root, head);
while (!head.isleaf)
{
headNode = head.Pointer[0];
readBplusNode(head.Pointer[0], head);
}
// current = headNode;
i = 0;
while ((headNode != flagNode) || (headNode == flagNode && i <= flagIndex))
{
if (i == head.nkey)
{
i = 0;
headNode = head.Pointer[MAX_INT];
readBplusNode(headNode, head);
}
else
{
result_temp.num = head.Pointer[i] >> 12;
result_temp.offset = toOffset(head.Pointer[i]);
result.push_back(result_temp);
i++;
}
}
}
return result;
}
vector<index_info> IndexManager::searchBplusTree(TargetFloat& tar, ADDRESS& resultAdd)
{
int i;
int flagNode = -1, flagIndex = -1;
vector<index_info> result;
index_info result_temp;
ADDRESS current = root;
ADDRESS leafNode;
BplusNodeFloat a;
do
{
leafNode = current; //record the node ID of the leaf node
readBplusNode(current, a);
for (i = 0; i < a.nkey && tar.key > a.key[i]; i++);
if (i < a.nkey && a.isleaf && tar.key == a.key[i]) //在B+树叶节点找到了等值的关键字
{
resultAdd = current; //返回该关键字所对应的记录的地址
if (tar.type == SINGLE)
{
result_temp.num = a.Pointer[i] >> 12;
result_temp.offset = toOffset(a.Pointer[i]);
result.push_back(result_temp);
}
else if (tar.type == NOTLARGER)
{
flagIndex = i;
flagNode = current;
}
else if (tar.type == LARGER)
{
i++;
}
}
current = a.Pointer[i];
} while (!a.isleaf);
if (tar.type == NOTLESS || tar.type == LARGER)
{
for (; i < a.nkey; i++)
{
result_temp.num = a.Pointer[i] >> 12;
result_temp.offset = toOffset(a.Pointer[i]);
result.push_back(result_temp);
}
while (i == a.nkey && a.Pointer[MAX_FLOAT] > 0)
{
current = a.Pointer[MAX_FLOAT];
readBplusNode(current, a);
for (i = 0; i < a.nkey; i++)
{
result_temp.num = a.Pointer[i] >> 12;
result_temp.offset = toOffset(a.Pointer[i]);
result.push_back(result_temp);
}
}
}
else if (tar.type == NOTLARGER || tar.type == LESS)
{
if (flagIndex < 0)
{
flagNode = leafNode;
flagIndex = i - 1;
}
BplusNodeFloat head;
ADDRESS headNode = root;
readBplusNode(root, head);
while (!head.isleaf)
{
headNode = head.Pointer[0];
readBplusNode(head.Pointer[0], head);
}
// current = headNode;
i = 0;
while ((headNode != flagNode) || (headNode == flagNode && i <= flagIndex))
{
if (i == head.nkey)
{
i = 0;
headNode = head.Pointer[MAX_FLOAT];
readBplusNode(headNode, head);
}
else
{
result_temp.num = head.Pointer[i] >> 12;
result_temp.offset = toOffset(head.Pointer[i]);
result.push_back(result_temp);
i++;
}
}
}
return result;
}
vector<index_info> IndexManager::searchBplusTree(TargetChar& tar, ADDRESS& resultAdd)
{
int i;
int flagNode = -1, flagIndex = -1;
vector<index_info> result;
index_info result_temp;
ADDRESS current = root;
ADDRESS leafNode;
BplusNodeChar a;
do
{
leafNode = current; //record the node ID of the leaf node
readBplusNode(current, a);
for (i = 0; i < a.nkey && tar.key > toString(a.key[i]); i++);
if (i < a.nkey && a.isleaf && tar.key == toString(a.key[i])) //在B+树叶节点找到了等值的关键字
{
resultAdd = current; //返回该关键字所对应的记录的地址
if (tar.type == SINGLE)
{