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lmdb-safe
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add rc checking to cursors, add lower_bound(), next()

This commit is contained in:
bert hubert 2019-01-05 14:38:52 +01:00
parent 66a6adaf10
commit a6ee07d8ef
1 changed files with 56 additions and 11 deletions
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67
lmdb-safe.hh
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@ -10,7 +10,8 @@
#include <string.h>
#include <mutex>
#if __cplusplus < 201703L
// apple compiler somehow has string_view even in c++11!
#if __cplusplus < 201703L && !defined(__APPLE__)
#include <boost/version.hpp>
#if BOOST_VERSION > 105400
#include <boost/utility/string_view.hpp>
@ -324,15 +325,37 @@ public:
int get(MDBOutVal& key, MDBOutVal& data, MDB_cursor_op op)
{
// XXX add rc check
return mdb_cursor_get(d_cursor, &key.d_mdbval, &data.d_mdbval, op);
int rc = mdb_cursor_get(d_cursor, &key.d_mdbval, &data.d_mdbval, op);
if(rc && rc != MDB_NOTFOUND)
throw std::runtime_error("Unable to get from cursor: " + std::string(mdb_strerror(rc)));
return rc;
}
int find(const MDBInVal& in, MDBOutVal& key, MDBOutVal& data)
{
// XXX add rc check
key.d_mdbval = in.d_mdbval;
return mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_SET);
int rc=mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_SET);
if(rc && rc != MDB_NOTFOUND)
throw std::runtime_error("Unable to find from cursor: " + std::string(mdb_strerror(rc)));
return rc;
}
int lower_bound(const MDBInVal& in, MDBOutVal& key, MDBOutVal& data)
{
key.d_mdbval = in.d_mdbval;
int rc = mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_SET_RANGE);
if(rc && rc != MDB_NOTFOUND)
throw std::runtime_error("Unable to lower_bound from cursor: " + std::string(mdb_strerror(rc)));
return rc;
}
int next(MDBOutVal& key, MDBOutVal& data)
{
int rc = mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_NEXT);
if(rc && rc != MDB_NOTFOUND)
throw std::runtime_error("Unable to next from cursor: " + std::string(mdb_strerror(rc)));
return rc;
}
MDB_cursor* d_cursor;
@ -528,12 +551,6 @@ public:
return rc;
}
int find(const MDBInVal& in, MDBOutVal& key, MDBOutVal& data)
{
key.d_mdbval = in.d_mdbval;
return mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_SET);
}
int put(const MDBOutVal& key, const MDBOutVal& data, int flags=0)
{
@ -543,6 +560,34 @@ public:
const_cast<MDB_val*>(&data.d_mdbval), flags);
}
int find(const MDBInVal& in, MDBOutVal& key, MDBOutVal& data)
{
key.d_mdbval = in.d_mdbval;
int rc=mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_SET);
if(rc && rc != MDB_NOTFOUND)
throw std::runtime_error("Unable to find from cursor: " + std::string(mdb_strerror(rc)));
return rc;
}
int lower_bound(const MDBInVal& in, MDBOutVal& key, MDBOutVal& data)
{
key.d_mdbval = in.d_mdbval;
int rc = mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_SET_RANGE);
if(rc && rc != MDB_NOTFOUND)
throw std::runtime_error("Unable to lower_bound from cursor: " + std::string(mdb_strerror(rc)));
return rc;
}
int next(MDBOutVal& key, MDBOutVal& data)
{
int rc = mdb_cursor_get(d_cursor, const_cast<MDB_val*>(&key.d_mdbval), &data.d_mdbval, MDB_NEXT);
if(rc && rc != MDB_NOTFOUND)
throw std::runtime_error("Unable to next from cursor: " + std::string(mdb_strerror(rc)));
return rc;
}
int del(int flags=0)
{
return mdb_cursor_del(d_cursor, flags);