1. Table ‘reports’ id docid path val created_at 1 /root/title ‘report A’
CREATE TABLE reports (
id INTEGER PRIMARY KEY,
docid INTEGER,
path TEXT,
val TEXT );
INSERT INTO reports (1, 1, ‘/root/title’, ‘report A’);
INSERT INTO reports (2, 1, ‘/root/author’, ‘kaneko’);
INSERT INTO reports (3, 1, ‘/root/date’, ‘2009/11/29’);
■ The attribute ‘id’ is the PRIMARY KEY
The ‘id’ is key that can be used to identify
each row.
Table ‘reports’ id
docid
path
val
created_at 1
/root/title
‘report A’
:20:36 2
/root/author
‘kaneko’ 3
/root/date
‘2009/11/29’
PRIMARY
KEY
Fig. Logical Structure of the Table

2. Table ‘reports’ id docid path val created_at 1 /root/title ‘report A’
:20:36 2
/root/author
‘kaneko’ 3
/root/date
‘2009/11/29’
PRIMARY
KEY
Logical Structure
Keys
Associated Records
link 1
Record(1, ‘/root/title’, ‘report A’, ‘ :20:36’)
link 2
Record(2, ‘/root/author’, ‘kaneko’, ‘ :20:36’)
link 3
Record(3, ‘/root/date’, ‘2009/11/29’, ‘ :20:36’)
Each key is associated with each record.
Physical Structure
Fig. Logical Structure and Physical Structure

4. Record Header
Record Data
Database Image

5. Database Header
SQLite Database File

6. SQLite 3 データベースヘッダ
に格納されている情報の例
Page size: 04 00
Database encoding:
※ UTF-8: 01
little-endian UTF-16: 02
big-endian UTF-16: 03

7. Record(1, ‘/root/title’, ‘report A’)
Keys
Associated Records
link 1
Record(1, ‘/root/title’, ‘report A’)
link 2
Record(2, ‘/root/author’, ‘kaneko’)
link 3
Record(3, ‘/root/date’, ‘2009/11/29’)
Each key is associated with each record.
Fig. Physical Structure of the Table
Record Length (Note that record length is variable)
Fig. Database File Layout Example (SQLite 3)