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#ifndef TAGSTATS_SQLITE_HPP
#define TAGSTATS_SQLITE_HPP
/*
Copyright 2012 Jochen Topf <jochen@topf.org>.
This file is part of Tagstats.
Tagstats is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Tagstats is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Tagstats. If not, see <http://www.gnu.org/licenses/>.
*/
#include <iostream>
#include <stdexcept>
#include <stdint.h>
#include <string>
#include <sqlite3.h>
/**
* @brief The %Sqlite classes wrap the %Sqlite C library.
*/
namespace Sqlite {
/**
* Exception returned by Sqlite wrapper classes when there are errors in the Sqlite3 lib
*/
class Exception : public std::runtime_error {
public:
Exception(const std::string& msg, const std::string& error) :
std::runtime_error(msg + ": " + error + '\n') {
}
};
class Statement;
/**
* Wrapper class for Sqlite database
*/
class Database {
private:
sqlite3* m_db;
public:
Database(const char* filename) {
if (sqlite3_open_v2(filename, &m_db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0)) {
sqlite3_close(m_db);
throw Sqlite::Exception("Can't open database", errmsg());
}
}
~Database() {
sqlite3_close(m_db);
}
const std::string& errmsg() const {
static std::string error = std::string(sqlite3_errmsg(m_db));
return error;
}
sqlite3* get_sqlite3() {
return m_db;
}
void begin_transaction() {
if (SQLITE_OK != sqlite3_exec(m_db, "BEGIN TRANSACTION;", 0, 0, 0)) {
std::cerr << "Database error: " << sqlite3_errmsg(m_db) << "\n";
sqlite3_close(m_db);
throw std::runtime_error("Sqlite error");
}
}
void commit() {
if (SQLITE_OK != sqlite3_exec(m_db, "COMMIT;", 0, 0, 0)) {
std::cerr << "Database error: " << sqlite3_errmsg(m_db) << "\n";
sqlite3_close(m_db);
throw std::runtime_error("Sqlite error");
}
}
}; // class Database
/**
* Wrapper class for Sqlite prepared statement.
*/
class Statement {
public:
Statement(Database& db, const char* sql) :
m_db(db),
m_statement(0),
m_bindnum(1) {
sqlite3_prepare_v2(db.get_sqlite3(), sql, -1, &m_statement, 0);
if (m_statement == 0) {
throw Sqlite::Exception("Can't prepare statement", m_db.errmsg());
}
}
~Statement() {
sqlite3_finalize(m_statement);
}
Statement& bind_null() {
if (SQLITE_OK != sqlite3_bind_null(m_statement, m_bindnum++)) {
throw Sqlite::Exception("Can't bind null value", m_db.errmsg());
}
return *this;
}
Statement& bind_text(const char* value) {
if (SQLITE_OK != sqlite3_bind_text(m_statement, m_bindnum++, value, -1, SQLITE_STATIC)) {
throw Sqlite::Exception("Can't bind text value", m_db.errmsg());
}
return *this;
}
Statement& bind_text(const std::string& value) {
if (SQLITE_OK != sqlite3_bind_text(m_statement, m_bindnum++, value.c_str(), -1, SQLITE_STATIC)) {
throw Sqlite::Exception("Can't bind text value", m_db.errmsg());
}
return *this;
}
Statement& bind_int(int value) {
if (SQLITE_OK != sqlite3_bind_int(m_statement, m_bindnum++, value)) {
throw Sqlite::Exception("Can't bind int value", m_db.errmsg());
}
return *this;
}
Statement& bind_int64(int64_t value) {
if (SQLITE_OK != sqlite3_bind_int64(m_statement, m_bindnum++, value)) {
throw Sqlite::Exception("Can't bind int64 value", m_db.errmsg());
}
return *this;
}
Statement& bind_double(double value) {
if (SQLITE_OK != sqlite3_bind_double(m_statement, m_bindnum++, value)) {
throw Sqlite::Exception("Can't bind double value", m_db.errmsg());
}
return *this;
}
Statement& bind_blob(const void* value, int length) {
if (SQLITE_OK != sqlite3_bind_blob(m_statement, m_bindnum++, value, length, 0)) {
throw Sqlite::Exception("Can't bind blob value", m_db.errmsg());
}
return *this;
}
void execute() {
sqlite3_step(m_statement);
if (SQLITE_OK != sqlite3_reset(m_statement)) {
throw Sqlite::Exception("Can't execute statement", m_db.errmsg());
}
m_bindnum = 1;
}
private:
Database& m_db;
sqlite3_stmt* m_statement;
int m_bindnum;
}; // class Statement
} // namespace Sqlite
#endif // TAGSTATS_SQLITE_HPP
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