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#ifndef DATABASE_H_0B0A47D2
#define DATABASE_H_0B0A47D2
#include <sqlite3.h>
#include <fstream>
#include <sstream>
#include <string>
#include <stdexcept>
#include <list>
#include <memory>
#include "../vendor/variant.hpp"
#include "string.h"
namespace hatkirby {
class sqlite3_error : public std::runtime_error {
public:
sqlite3_error(
const std::string& what,
sqlite3* ppdb)
: std::runtime_error(generateWhat(what, ppdb))
{
}
private:
static std::string generateWhat(
const std::string& what,
sqlite3* ppdb)
{
std::string errmsg(sqlite3_errmsg(ppdb));
return what + " (" + errmsg + ")";
}
};
enum class dbmode {
read,
readwrite,
create
};
using binding =
mpark::variant<
std::string,
int>;
using column =
std::tuple<
std::string,
binding>;
class database {
public:
// Constructor
explicit database(
std::string path,
dbmode mode)
{
if (mode == dbmode::create)
{
// If there is already a file at this path, overwrite it.
if (std::ifstream(path))
{
if (std::remove(path.c_str()))
{
throw std::logic_error("Could not overwrite file at path");
}
}
}
sqlite3* tempDb;
int flags;
if (mode == dbmode::read)
{
flags = SQLITE_OPEN_READONLY;
} else {
flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE;
}
int ret = sqlite3_open_v2(
path.c_str(),
&tempDb,
flags,
NULL);
ppdb_ = ppdb_type(tempDb);
if (ret != SQLITE_OK)
{
throw sqlite3_error("Could not create output datafile", ppdb_.get());
}
}
// Actions
void execute(std::string query)
{
sqlite3_stmt* ppstmt;
if (sqlite3_prepare_v2(
ppdb_.get(),
query.c_str(),
query.length(),
&ppstmt,
NULL) != SQLITE_OK)
{
throw sqlite3_error("Error writing to database", ppdb_.get());
}
int result = sqlite3_step(ppstmt);
sqlite3_finalize(ppstmt);
if (result != SQLITE_DONE)
{
throw sqlite3_error("Error writing to database", ppdb_.get());
}
}
void insertIntoTable(
std::string table,
std::list<column> columns)
{
std::list<std::string> fieldNames;
std::list<std::string> qs;
for (const column& c : columns)
{
fieldNames.push_back(std::get<0>(c));
qs.push_back("?");
}
std::ostringstream query;
query << "INSERT INTO ";
query << table;
query << " (";
query << implode(std::begin(fieldNames), std::end(fieldNames), ", ");
query << ") VALUES (";
query << implode(std::begin(qs), std::end(qs), ", ");
query << ")";
std::string query_str = query.str();
sqlite3_stmt* ppstmt;
if (sqlite3_prepare_v2(
ppdb_.get(),
query_str.c_str(),
query_str.length(),
&ppstmt,
NULL) != SQLITE_OK)
{
throw sqlite3_error("Error writing to database", ppdb_.get());
}
int i = 1;
for (const column& c : columns)
{
const binding& b = std::get<1>(c);
if (mpark::holds_alternative<int>(b))
{
sqlite3_bind_int(ppstmt, i, mpark::get<int>(b));
} else if (mpark::holds_alternative<std::string>(b))
{
const std::string& arg = mpark::get<std::string>(b);
sqlite3_bind_text(
ppstmt,
i,
arg.c_str(),
arg.length(),
SQLITE_TRANSIENT);
}
i++;
}
int result = sqlite3_step(ppstmt);
sqlite3_finalize(ppstmt);
if (result != SQLITE_DONE)
{
throw sqlite3_error("Error writing to database", ppdb_.get());
}
}
private:
class sqlite3_deleter {
public:
void operator()(sqlite3* ptr) const
{
sqlite3_close_v2(ptr);
}
};
using ppdb_type = std::unique_ptr<sqlite3, sqlite3_deleter>;
ppdb_type ppdb_;
};
};
#endif /* end of include guard: DATABASE_H_0B0A47D2 */
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