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#ifndef SQLITE_HPP
#define SQLITE_HPP
/*
Author: Jochen Topf <jochen@topf.org>
https://github.com/joto/sqlite-cpp-wrapper
This code is released into the Public Domain.
*/
#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') {
}
};
/**
* Wrapper class for Sqlite database
*/
class Database {
public:
Database(const char* filename, const int flags) {
if (SQLITE_OK != sqlite3_open_v2(filename, &m_db, flags, 0)) {
std::string error = errmsg();
sqlite3_close(m_db);
throw Sqlite::Exception("Can't open database", error);
}
}
~Database() {
sqlite3_close(m_db);
}
std::string errmsg() {
if (m_db) {
return std::string(sqlite3_errmsg(m_db));
} else {
return std::string("Database is not open");
}
}
sqlite3* get_sqlite3() {
return m_db;
}
void exec(const std::string& sql) {
if (SQLITE_OK != sqlite3_exec(m_db, sql.c_str(), 0, 0, 0)) {
std::string error = errmsg();
sqlite3_close(m_db);
throw Sqlite::Exception("Database error", error);
}
}
void begin_transaction() {
exec("BEGIN TRANSACTION;");
}
void commit() {
exec("COMMIT;");
}
void rollback() {
exec("ROLLBACK;");
}
private:
sqlite3* m_db;
}; // 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(const 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(const 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(const 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, const 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;
}
bool read() {
switch (sqlite3_step(m_statement)) {
case SQLITE_ROW:
return true;
case SQLITE_DONE:
return false;
default:
throw Sqlite::Exception("Sqlite error", m_db.errmsg());
}
}
int column_count() {
return sqlite3_column_count(m_statement);
}
std::string get_text(int column) {
if (column >= column_count()) {
throw Sqlite::Exception("Column larger than max columns", "");
}
const char* textptr = reinterpret_cast<const char*>(sqlite3_column_text(m_statement, column));
if (!textptr) {
throw Sqlite::Exception("Error reading text column", m_db.errmsg());
}
return std::string(textptr);
}
const char* get_string(int column) {
if (column >= column_count()) {
throw Sqlite::Exception("Column larger than max columns", "");
}
const char* textptr = reinterpret_cast<const char*>(sqlite3_column_text(m_statement, column));
if (!textptr) {
throw Sqlite::Exception("Error reading text column", m_db.errmsg());
}
return textptr;
}
int get_int(int column) {
if (column >= column_count()) {
throw Sqlite::Exception("Column larger than max columns", m_db.errmsg());
}
return sqlite3_column_int(m_statement, column);
}
private:
Database& m_db;
sqlite3_stmt* m_statement;
int m_bindnum;
}; // class Statement
} // namespace Sqlite
#endif // SQLITE_HPP
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