1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
// Copyright (c) 2006-2008 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 "chrome/browser/meta_table_helper.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "chrome/common/sqlite_utils.h"
// Key used in our meta table for version numbers.
static const char kVersionKey[] = "version";
static const char kCompatibleVersionKey[] = "last_compatible_version";
MetaTableHelper::MetaTableHelper() : db_(NULL) {
}
MetaTableHelper::~MetaTableHelper() {
}
bool MetaTableHelper::Init(const std::string& db_name,
int version,
int compatible_version,
sqlite3* db) {
DCHECK(!db_ && db);
db_ = db;
db_name_ = db_name;
if (!DoesSqliteTableExist(db_, db_name.c_str(), "meta")) {
// Build the sql.
std::string sql("CREATE TABLE ");
if (!db_name.empty()) {
// Want a table name of the form db_name.meta
sql.append(db_name);
sql.push_back('.');
}
sql.append("meta(key LONGVARCHAR NOT NULL UNIQUE PRIMARY KEY,"
"value LONGVARCHAR)");
if (sqlite3_exec(db_, sql.c_str(), NULL, NULL, NULL) != SQLITE_OK)
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;
}
bool MetaTableHelper::SetValue(const std::string& key,
const std::wstring& value) {
SQLStatement s;
if (!PrepareSetStatement(&s, key))
return false;
s.bind_text16(1, value.c_str());
return s.step() == SQLITE_DONE;
}
bool MetaTableHelper::GetValue(const std::string& key,
std::wstring* value) {
DCHECK(value);
SQLStatement s;
if (!PrepareGetStatement(&s, key))
return false;
s.column_string16(0, value);
return true;
}
bool MetaTableHelper::SetValue(const std::string& key,
int value) {
SQLStatement s;
if (!PrepareSetStatement(&s, key))
return false;
s.bind_int(1, value);
return s.step() == SQLITE_DONE;
}
bool MetaTableHelper::GetValue(const std::string& key,
int* value) {
DCHECK(value);
SQLStatement s;
if (!PrepareGetStatement(&s, key))
return false;
*value = s.column_int(0);
return true;
}
bool MetaTableHelper::SetValue(const std::string& key,
int64 value) {
SQLStatement s;
if (!PrepareSetStatement(&s, key))
return false;
s.bind_int64(1, value);
return s.step() == SQLITE_DONE;
}
bool MetaTableHelper::GetValue(const std::string& key,
int64* value) {
DCHECK(value);
SQLStatement s;
if (!PrepareGetStatement(&s, key))
return false;
*value = s.column_int64(0);
return true;
}
void MetaTableHelper::SetVersionNumber(int version) {
SetValue(kVersionKey, version);
}
int MetaTableHelper::GetVersionNumber() {
int version;
if (!GetValue(kVersionKey, &version))
return 0;
return version;
}
void MetaTableHelper::SetCompatibleVersionNumber(int version) {
SetValue(kCompatibleVersionKey, version);
}
int MetaTableHelper::GetCompatibleVersionNumber() {
int version;
if (!GetValue(kCompatibleVersionKey, &version))
return 0;
return version;
}
bool MetaTableHelper::PrepareSetStatement(SQLStatement* statement,
const std::string& key) {
DCHECK(db_ && statement);
std::string sql("INSERT OR REPLACE INTO ");
if (db_name_.size() > 0) {
sql.append(db_name_);
sql.push_back('.');
}
sql.append("meta(key,value) VALUES(?,?)");
if (statement->prepare(db_, sql.c_str()) != SQLITE_OK) {
NOTREACHED() << sqlite3_errmsg(db_);
return false;
}
statement->bind_text(0, key.c_str());
return true;
}
bool MetaTableHelper::PrepareGetStatement(SQLStatement* statement,
const std::string& key) {
DCHECK(db_ && statement);
std::string sql("SELECT value FROM ");
if (db_name_.size() > 0) {
sql.append(db_name_);
sql.push_back('.');
}
sql.append("meta WHERE key = ?");
if (statement->prepare(db_, sql.c_str()) != SQLITE_OK) {
NOTREACHED() << sqlite3_errmsg(db_);
return false;
}
statement->bind_string(0, key);
if (statement->step() != SQLITE_ROW)
return false;
return true;
}
|
