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/*
* Copyright 2003-2020 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_SQLITE_UTIL_HXX
#define MPD_SQLITE_UTIL_HXX
#include "util/Compiler.h"
#include "Error.hxx"
#include <sqlite3.h>
#include <cassert>
namespace Sqlite {
static inline sqlite3_stmt *
Prepare(sqlite3 *db, const char *sql)
{
sqlite3_stmt *stmt;
int ret = sqlite3_prepare_v2(db, sql, -1, &stmt, nullptr);
if (ret != SQLITE_OK)
throw SqliteError(db, ret,
"sqlite3_prepare_v2() failed");
return stmt;
}
/**
* Throws #SqliteError on error.
*/
static void
Bind(sqlite3_stmt *stmt, unsigned i, const char *value)
{
int result = sqlite3_bind_text(stmt, i, value, -1, nullptr);
if (result != SQLITE_OK)
throw SqliteError(stmt, result, "sqlite3_bind_text() failed");
}
template<typename... Args>
static void
BindAll2([[maybe_unused]] sqlite3_stmt *stmt, [[maybe_unused]] unsigned i)
{
assert(int(i - 1) == sqlite3_bind_parameter_count(stmt));
}
template<typename... Args>
static void
BindAll2(sqlite3_stmt *stmt, unsigned i,
const char *value, Args&&... args)
{
Bind(stmt, i, value);
BindAll2(stmt, i + 1, std::forward<Args>(args)...);
}
/**
* Throws #SqliteError on error.
*/
template<typename... Args>
static void
BindAll(sqlite3_stmt *stmt, Args&&... args)
{
assert(int(sizeof...(args)) == sqlite3_bind_parameter_count(stmt));
BindAll2(stmt, 1, std::forward<Args>(args)...);
}
/**
* Call sqlite3_stmt() repepatedly until something other than
* SQLITE_BUSY is returned.
*/
static int
ExecuteBusy(sqlite3_stmt *stmt)
{
int result;
do {
result = sqlite3_step(stmt);
} while (result == SQLITE_BUSY);
return result;
}
/**
* Wrapper for ExecuteBusy() that returns true on SQLITE_ROW.
*
* Throws #SqliteError on error.
*/
static bool
ExecuteRow(sqlite3_stmt *stmt)
{
int result = ExecuteBusy(stmt);
if (result == SQLITE_ROW)
return true;
if (result != SQLITE_DONE)
throw SqliteError(stmt, result, "sqlite3_step() failed");
return false;
}
/**
* Wrapper for ExecuteBusy() that interprets everything other than
* SQLITE_DONE as error.
*
* Throws #SqliteError on error.
*/
static void
ExecuteCommand(sqlite3_stmt *stmt)
{
int result = ExecuteBusy(stmt);
if (result != SQLITE_DONE)
throw SqliteError(stmt, result, "sqlite3_step() failed");
}
/**
* Wrapper for ExecuteCommand() that returns the number of rows
* modified via sqlite3_changes().
*
* Throws #SqliteError on error.
*/
static inline unsigned
ExecuteChanges(sqlite3_stmt *stmt)
{
ExecuteCommand(stmt);
return sqlite3_changes(sqlite3_db_handle(stmt));
}
/**
* Wrapper for ExecuteChanges() that returns true if at least one row
* was modified. Returns false if nothing was modified.
*
* Throws #SqliteError on error.
*/
static inline bool
ExecuteModified(sqlite3_stmt *stmt)
{
return ExecuteChanges(stmt) > 0;
}
template<typename F>
static inline void
ExecuteForEach(sqlite3_stmt *stmt, F &&f)
{
while (true) {
int result = ExecuteBusy(stmt);
switch (result) {
case SQLITE_ROW:
f();
break;
case SQLITE_DONE:
return;
default:
throw SqliteError(stmt, result, "sqlite3_step() failed");
}
}
}
} // namespace Sqlite
#endif
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