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40
source/_posts/MySQL.md
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@ -969,3 +969,43 @@ Maven下载依赖
仅用于分表。仅DATE、DATETIME类型。 仅用于分表。仅DATE、DATETIME类型。
一年之中第几天%分表数。tbpartitions不能超过366。 一年之中第几天%分表数。tbpartitions不能超过366。
# MySQL 查询语句
## 查询语句中字段别名取表中的comment
在 MySQL 中，字段的 comment 并不存储在数据行里，而是放在 **information_schema.COLUMNS** 中。
因此可以通过把 **column_comment** 查出来，再拼成 **SELECT 语句的别名**，实现“用表中字段的 comment 做别名”的效果。
一次性查出某张表所有列，并把 comment 作为别名：
```mysql
-- 示例：表名 mydb.mytable
SELECT CONCAT(
'SELECT ',
GROUP_CONCAT(
CONCAT('`', COLUMN_NAME, '` AS `', REPLACE(COLUMN_COMMENT, '`', ''), '`')
ORDER BY ORDINAL_POSITION
),
' FROM mytable;'
) AS sql_text
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'mydb'
AND TABLE_NAME = 'mytable';
```
执行后得到一条 SQL，例如：
```mysql
SELECT id AS 主键, name AS 用户名, age AS 年龄 FROM mytable;
```
**拼 SQL 时丢列**
上一段拼接脚本里 `GROUP_CONCAT` 有 **长度限制**（默认 1024 字节）。
如果表列很多，会被截断导致看起来“少字段”。
解决方法：
```mysql
SET SESSION group_concat_max_len = 1000000; -- 临时放大
```

26
source/_posts/Vim.md
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@ -69,10 +69,12 @@ vim 的各种工作模式可以通过不同的键进行切换，用户统一使
在底线命令模式中，基本的命令有（已经省略了冒号）： 在底线命令模式中，基本的命令有（已经省略了冒号）：
- :w: 保存文件 - :w 保存文件
- :q: 退出 Vim 编辑器 - :q 退出 Vim 编辑器
- :wq: 保存文件并退出 Vim 编辑器 - :wq 保存文件并退出 Vim 编辑器
- :q!: 强制退出 Vim 编辑器，不保存修改 - :q! 强制退出 Vim 编辑器，不保存修改
- :set nu 开启行号
- :set nonu 关闭行号
按`ESC`键可随时退出底线命令模式。 按`ESC`键可随时退出底线命令模式。
@ -183,4 +185,20 @@ vim 的各种工作模式可以通过不同的键进行切换，用户统一使
</thead> </thead>
</table> </table>
</center> </center>
# Vim配置文件
## 当前用户配置文件（~/.vimrc）
若在当前用户目录下没有`.vimrc`，则手动新建即可
```bash
vim ~/.vimrc
```
其中可添加如命令模式中的命令，比如`set nu`，之后再打开vim则默认开启行号
```
set nu
```
`:wq`保存退出后，需使用`source ~/.vimrc`使改动生效

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source/_posts/大数据.md
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@ -10,6 +10,196 @@ tags:
## 安装 ## 安装
### Docker Compose 方式
> [Quick Start - Apache Doris](https://doris.apache.org/docs/dev/gettingStarted/quick-start)
新建用于Docker Compose 集群编排启动目录`mkdir -p /OLAP/doris`
```bash
mkdir -p /OLAP/doris
```
编写启动脚本`start-doris.sh`
> https://doris.apache.org/files/start-doris.sh
```sh
#!/bin/bash
# Default version
DORIS_QUICK_START_VERSION="2.1.9"
# Parse parameters
while getopts "v:" opt; do
case $opt in
v) DORIS_QUICK_START_VERSION="$OPTARG"
;;
\?) echo "Invalid option: -$OPTARG" >&2
exit 1
;;
esac
done
# Check system type
OS_TYPE=$(uname -s)
if [[ "$OS_TYPE" != "Linux" && "$OS_TYPE" != "Darwin" ]]; then
echo "Error: Unsupported operating system [$OS_TYPE], only Linux and Mac are supported"
exit 1
fi
# Check Docker environment
if ! command -v docker &> /dev/null; then
echo "Error: Docker environment not detected, please install Docker first"
exit 1
fi
# Check docker-compose
COMPOSE_CMD=""
if command -v docker-compose &> /dev/null; then
COMPOSE_CMD="docker-compose"
elif docker compose version &> /dev/null; then
COMPOSE_CMD="docker compose"
else
echo "Error: docker-compose plugin or docker-compose command is required"
exit 1
fi
# Generate docker-compose configuration for corresponding system
if [[ "$OS_TYPE" == "Linux" ]]; then
cat > docker-compose-doris.yaml <<EOF
version: "3"
services:
fe:
image: apache/doris:fe-${DORIS_QUICK_START_VERSION}
hostname: fe
environment:
- FE_SERVERS=fe1:127.0.0.1:9010
- FE_ID=1
network_mode: host
volumes:
- /mnt/app/doris/fe/doris-meta/:/opt/apache-doris/fe/doris-meta/
- /mnt/app/doris/fe/log/:/opt/apache-doris/fe/log/
be:
image: apache/doris:be-${DORIS_QUICK_START_VERSION}
hostname: be
environment:
- FE_SERVERS=fe1:127.0.0.1:9010
- BE_ADDR=127.0.0.1:9050
depends_on:
- fe
network_mode: host
volumes:
- /mnt/app/doris/be/storage/:/opt/apache-doris/be/storage/
- /mnt/app/doris/be/script/:/docker-entrypoint-initdb.d/
EOF
else # Mac system
cat > docker-compose-doris.yaml <<EOF
version: "3"
networks:
custom_network:
driver: bridge
ipam:
config:
- subnet: 172.20.80.0/24
services:
fe:
image: apache/doris:fe-${DORIS_QUICK_START_VERSION}
hostname: fe
ports:
- 8030:8030
- 9030:9030
- 9010:9010
environment:
- FE_SERVERS=fe1:172.20.80.2:9010
- FE_ID=1
networks:
custom_network:
ipv4_address: 172.20.80.2
be:
image: apache/doris:be-${DORIS_QUICK_START_VERSION}
hostname: be
ports:
- 8040:8040
- 9050:9050
environment:
- FE_SERVERS=fe1:172.20.80.2:9010
- BE_ADDR=172.20.80.3:9050
depends_on:
- fe
networks:
custom_network:
ipv4_address: 172.20.80.3
EOF
fi
# Start services
$COMPOSE_CMD -f docker-compose-doris.yaml up -d
echo "Doris cluster started successfully, version: ${DORIS_QUICK_START_VERSION}"
echo "You can manage the cluster using the following commands:"
echo " Stop cluster: $COMPOSE_CMD -f docker-compose-doris.yaml down"
echo " View logs: $COMPOSE_CMD -f docker-compose-doris.yaml logs -f"
echo " Connect to cluster: mysql -uroot -P9030 -h127.0.0.1"
# Display connection information based on system type
if [[ "$OS_TYPE" == "Linux" ]]; then
echo -e "\nAccess FE/BE http ports (8030, 8040) using the following addresses (Linux system):"
echo " http://127.0.0.1:8030"
echo " http://127.0.0.1:8040"
elif [[ "$OS_TYPE" == "Darwin" ]]; then
echo -e "\nAccess FE/BE http ports (8030, 8040) using the following addresses (Mac system):"
echo " http://docker.for.mac.localhost:8030"
echo " http://docker.for.mac.localhost:8040"
echo "Note: If access fails, try using 127.0.0.1 address:"
echo " http://127.0.0.1:8030"
echo " http://127.0.0.1:8040"
fi
```
赋予权限
```bash
chmod 755 start-doris.sh
```
启动集群
```bash
./start-doris.sh
```
可以指定启动的版本通过`-v`参数，比如：
```bash
./start-doris.sh -v 2.1.8
```
使用MySQL客户端连接到集群并检查集群状态
```bash
## Check the FE status to ensure that both the Join and Alive columns are true.
mysql -uroot -P9030 -h127.0.0.1 -e 'SELECT `host`, `join`, `alive` FROM frontends()'
+-----------+------+-------+
| host | join | alive |
+-----------+------+-------+
| 127.0.0.1 | true | true |
+-----------+------+-------+
## Check the BE status to ensure that the Alive column is true.
mysql -uroot -P9030 -h127.0.0.1 -e 'SELECT `host`, `alive` FROM backends()'
+-----------+-------+
| host | alive |
+-----------+-------+
| 127.0.0.1 | 1 |
+-----------+-------+
```
### 配置 ### 配置
#### Linux系统环境配置（所有节点均需配置） #### Linux系统环境配置（所有节点均需配置）

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source/_posts/大模型.md
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@ -480,7 +480,54 @@ source ~/.zshrc
conda init conda init
``` ```
3. 3. conda和pip换镜像源
修改conda，通过以下命令进行添加
```lua
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
conda config --set show_channel_urls yes
```
修改后可以通过以下命令查看：
```armasm
conda info
```
下载试试：如果两都能看到下载源，那么就更改成功。
```mipsasm
conda install
```
##### Linux系统下:
linux系统下要到用户的文件夹下新建目录.pip，并在目录新建配置文件pip.conf
```bash
mkdir ~/.pip
cd ~/.pip
vi pip.conf
```
编辑内容：
```ini
[global]
index-url=https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host=pypi.tuna.tsinghua.edu.cn
disable-pip-version-check = true
timeout = 6000
```
下载试试：
```bash
pip install
```
# Jupyter Notebook # Jupyter Notebook