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zcash-patched-for-explorer
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close old db when rewriting

This commit is contained in:
Pieter Wuille 2011-11-20 17:12:00 +01:00 committed by Gavin Andresen
parent b2d3b2d65d
commit f53c5ede73
1 changed files with 55 additions and 53 deletions
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108
src/db.cpp
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@ -195,61 +195,63 @@ bool CDB::Rewrite(const string& strFile, const char* pszSkip)
bool fSuccess = true;
printf("Rewriting %s...\n", strFile.c_str());
string strFileRes = strFile + ".rewrite";
CDB db(strFile.c_str(), "r");
Db* pdbCopy = new Db(&dbenv, 0);
int ret = pdbCopy->open(NULL, // Txn pointer
strFileRes.c_str(), // Filename
"main", // Logical db name
DB_BTREE, // Database type
DB_CREATE, // Flags
0);
if (ret > 0)
{
printf("Cannot create database file %s\n", strFileRes.c_str());
fSuccess = false;
}
Dbc* pcursor = db.GetCursor();
if (pcursor)
while (fSuccess)
{ // surround usage of db with extra {}
CDB db(strFile.c_str(), "r");
Db* pdbCopy = new Db(&dbenv, 0);
int ret = pdbCopy->open(NULL, // Txn pointer
strFileRes.c_str(), // Filename
"main", // Logical db name
DB_BTREE, // Database type
DB_CREATE, // Flags
0);
if (ret > 0)
{
CDataStream ssKey;
CDataStream ssValue;
int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
if (ret == DB_NOTFOUND)
{
pcursor->close();
break;
}
else if (ret != 0)
{
pcursor->close();
fSuccess = false;
break;
}
if (pszSkip &&
strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
continue;
if (strncmp(&ssKey[0], "\x07version", 8) == 0)
{
// Update version:
ssValue.clear();
ssValue << VERSION;
}
Dbt datKey(&ssKey[0], ssKey.size());
Dbt datValue(&ssValue[0], ssValue.size());
int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
if (ret2 > 0)
fSuccess = false;
}
if (fSuccess)
{
db.Close();
CloseDb(strFile);
if (pdbCopy->close(0))
printf("Cannot create database file %s\n", strFileRes.c_str());
fSuccess = false;
delete pdbCopy;
}
Dbc* pcursor = db.GetCursor();
if (pcursor)
while (fSuccess)
{
CDataStream ssKey;
CDataStream ssValue;
int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
if (ret == DB_NOTFOUND)
{
pcursor->close();
break;
}
else if (ret != 0)
{
pcursor->close();
fSuccess = false;
break;
}
if (pszSkip &&
strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
continue;
if (strncmp(&ssKey[0], "\x07version", 8) == 0)
{
// Update version:
ssValue.clear();
ssValue << VERSION;
}
Dbt datKey(&ssKey[0], ssKey.size());
Dbt datValue(&ssValue[0], ssValue.size());
int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
if (ret2 > 0)
fSuccess = false;
}
if (fSuccess)
{
db.Close();
CloseDb(strFile);
if (pdbCopy->close(0))
fSuccess = false;
delete pdbCopy;
}
}
if (fSuccess)
{