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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sql/meta_table.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "sql/connection.h"
#include "sql/statement.h"
namespace sql {
// Key used in our meta table for version numbers.
static const char kVersionKey[] = "version";
static const char kCompatibleVersionKey[] = "last_compatible_version";
MetaTable::MetaTable() : db_(NULL) {
}
MetaTable::~MetaTable() {
}
// static
bool MetaTable::DoesTableExist(sql::Connection* db) {
DCHECK(db);
return db->DoesTableExist("meta");
}
bool MetaTable::Init(Connection* db, int version, int compatible_version) {
DCHECK(!db_ && db);
db_ = db;
if (!DoesTableExist(db)) {
if (!db_->Execute("CREATE TABLE meta"
"(key LONGVARCHAR NOT NULL UNIQUE PRIMARY KEY,"
"value LONGVARCHAR)"))
return false;
// Note: there is no index over the meta table. We currently only have a
// couple of keys, so it doesn't matter. If we start storing more stuff in
// there, we should create an index.
SetVersionNumber(version);
SetCompatibleVersionNumber(compatible_version);
}
return true;
}
void MetaTable::Reset() {
db_ = NULL;
}
bool MetaTable::SetValue(const char* key, const std::string& value) {
Statement s;
if (!PrepareSetStatement(&s, key))
return false;
s.BindString(1, value);
return s.Run();
}
bool MetaTable::GetValue(const char* key, std::string* value) {
Statement s;
if (!PrepareGetStatement(&s, key))
return false;
*value = s.ColumnString(0);
return true;
}
bool MetaTable::SetValue(const char* key, int value) {
Statement s;
if (!PrepareSetStatement(&s, key))
return false;
s.BindInt(1, value);
return s.Run();
}
bool MetaTable::GetValue(const char* key, int* value) {
Statement s;
if (!PrepareGetStatement(&s, key))
return false;
*value = s.ColumnInt(0);
return true;
}
bool MetaTable::SetValue(const char* key, int64 value) {
Statement s;
if (!PrepareSetStatement(&s, key))
return false;
s.BindInt64(1, value);
return s.Run();
}
bool MetaTable::GetValue(const char* key, int64* value) {
Statement s;
if (!PrepareGetStatement(&s, key))
return false;
*value = s.ColumnInt64(0);
return true;
}
void MetaTable::SetVersionNumber(int version) {
SetValue(kVersionKey, version);
}
int MetaTable::GetVersionNumber() {
int version = 0;
if (!GetValue(kVersionKey, &version))
return 0;
return version;
}
void MetaTable::SetCompatibleVersionNumber(int version) {
SetValue(kCompatibleVersionKey, version);
}
int MetaTable::GetCompatibleVersionNumber() {
int version = 0;
if (!GetValue(kCompatibleVersionKey, &version))
return 0;
return version;
}
bool MetaTable::PrepareSetStatement(Statement* statement, const char* key) {
DCHECK(db_ && statement);
statement->Assign(db_->GetCachedStatement(SQL_FROM_HERE,
"INSERT OR REPLACE INTO meta (key,value) VALUES (?,?)"));
if (!statement->is_valid()) {
NOTREACHED() << db_->GetErrorMessage();
return false;
}
statement->BindCString(0, key);
return true;
}
bool MetaTable::PrepareGetStatement(Statement* statement, const char* key) {
DCHECK(db_ && statement);
statement->Assign(db_->GetCachedStatement(SQL_FROM_HERE,
"SELECT value FROM meta WHERE key=?"));
if (!statement->is_valid()) {
NOTREACHED() << db_->GetErrorMessage();
return false;
}
statement->BindCString(0, key);
if (!statement->Step())
return false;
return true;
}
} // namespace sql
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