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/*
* Copyright (C) 2003-2015 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 "Domain.hxx"
#include "util/Error.hxx"
#include <sqlite3.h>
#include <assert.h>
static void
SetError(Error &error, sqlite3 *db, int code, const char *msg)
{
error.Format(sqlite_domain, code, "%s: %s",
msg, sqlite3_errmsg(db));
}
static void
SetError(Error &error, sqlite3_stmt *stmt, int code, const char *msg)
{
SetError(error, sqlite3_db_handle(stmt), code, msg);
}
static bool
Bind(sqlite3_stmt *stmt, unsigned i, const char *value, Error &error)
{
int result = sqlite3_bind_text(stmt, i, value, -1, nullptr);
if (result != SQLITE_OK) {
SetError(error, stmt, result, "sqlite3_bind_text() failed");
return false;
}
return true;
}
template<typename... Args>
static bool
BindAll2(gcc_unused Error &error, gcc_unused sqlite3_stmt *stmt,
gcc_unused unsigned i)
{
assert(int(i - 1) == sqlite3_bind_parameter_count(stmt));
return true;
}
template<typename... Args>
static bool
BindAll2(Error &error, sqlite3_stmt *stmt, unsigned i,
const char *value, Args&&... args)
{
return Bind(stmt, i, value, error) &&
BindAll2(error, stmt, i + 1, std::forward<Args>(args)...);
}
template<typename... Args>
static bool
BindAll(Error &error, sqlite3_stmt *stmt, Args&&... args)
{
assert(int(sizeof...(args)) == sqlite3_bind_parameter_count(stmt));
return BindAll2(error, stmt, 1, std::forward<Args>(args)...);
}
/**
* Wrapper for BindAll() that returns the specified sqlite3_stmt* on
* success and nullptr on error.
*/
template<typename... Args>
static sqlite3_stmt *
BindAllOrNull(Error &error, sqlite3_stmt *stmt, Args&&... args)
{
return BindAll(error, stmt, std::forward<Args>(args)...)
? stmt
: nullptr;
}
/**
* 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.
*/
static bool
ExecuteRow(sqlite3_stmt *stmt, Error &error)
{
int result = ExecuteBusy(stmt);
if (result == SQLITE_ROW)
return true;
if (result != SQLITE_DONE)
SetError(error, stmt, result, "sqlite3_step() failed");
return false;
}
/**
* Wrapper for ExecuteBusy() that interprets everything other than
* SQLITE_DONE as error.
*/
static bool
ExecuteCommand(sqlite3_stmt *stmt, Error &error)
{
int result = ExecuteBusy(stmt);
if (result != SQLITE_DONE) {
SetError(error, stmt, result, "sqlite3_step() failed");
return false;
}
return true;
}
/**
* Wrapper for ExecuteCommand() that returns the number of rows
* modified via sqlite3_changes(). Returns -1 on error.
*/
static inline int
ExecuteChanges(sqlite3_stmt *stmt, Error &error)
{
if (!ExecuteCommand(stmt, error))
return -1;
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 or if an error
* occurred.
*/
static inline bool
ExecuteModified(sqlite3_stmt *stmt, Error &error)
{
return ExecuteChanges(stmt, error) > 0;
}
template<typename F>
static inline bool
ExecuteForEach(sqlite3_stmt *stmt, Error &error, F &&f)
{
while (true) {
int result = ExecuteBusy(stmt);
switch (result) {
case SQLITE_ROW:
f();
break;
case SQLITE_DONE:
return true;
default:
SetError(error, stmt, result, "sqlite3_step() failed");
return false;
}
}
}
#endif
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