H2 Database IDEA 源码 DEBUG 环境搭建

基于最新的 version-2.3.230 拉取分支。

git remote add h2 https://github.com/h2database/h2database.git 
git fetch h2
git checkout -b version-2.3.230 version-2.3.230

使用

# 启动
java -jar h2*.jar

# H2 shell 方式使用
java -cp h2-*.jar org.h2.tools.Shell

h2 shell

启动类 org.h2.tools.Shell

# 配置启动参数
-url "jdbc:h2:~/test" -user "sa" -password "" 

测试 case

create table + insert

Welcome to H2 Shell 2.3.230 (2024-07-15)
Exit with Ctrl+C
[Enter]   jdbc:h2:~/test
URL       jdbc:h2:~/test
[Enter]   org.h2.Driver
Driver    org.h2.Driver
[Enter]   
User      sa
Password  Password  ><
Type the same password again to confirm database creation.
Password><Password  ><
Connected
Commands are case insensitive; SQL statements end with ';'
help or ?      Display this help
list           Toggle result list / stack trace mode
maxwidth       Set maximum column width (default is 100)
autocommit     Enable or disable autocommit
history        Show the last 20 statements
quit or exit   Close the connection and exit

sql> show tables;
TABLE_NAME | TABLE_SCHEMA
(0 rows, 197 ms)

sql> create table test(id int);
(Update count: 0, 5 ms)

sql> show tables;
TABLE_NAME | TABLE_SCHEMA
TEST       | PUBLIC
(1 row, 4 ms)

sql> insert into test values(1);
(Update count: 1, 4 ms)

sql> select * from test;
ID
1
(1 row, 1 ms)

sql> 

事务操作

sql> select * from test;
ID
1
1
(2 rows, 2 ms)

sql> begin;
(Update count: 0, 1 ms)

sql> delete from test;
(Update count: 2, 1 ms)

sql> rollback;
(Update count: 0, 2 ms)

sql> select * from test;
ID
1
1
(2 rows, 2 ms)

H2架构

根据官方文档介绍，从上到下，各层如下所示：

JDBC driver.
    JDBC 驱动程序
Connection/session management.
    连接/会话管理
SQL Parser.
    SQL 解析器
Command execution and planning.
    命令执行和计划
Table/Index/Constraints.
    表/索引/约束
Undo log, redo log, and transactions layer.
    undo log、redo log 和 事务层
B-tree engine and page-based storage allocation.
    B 树引擎 & 基于页的存储分配
Filesystem abstraction.
    文件系统抽象