BendSQL

Databend Native Client in Rust

Components

• core: Databend RestAPI Rust Client

• driver: Databend SQL Client for both RestAPI and FlightSQL in Rust

• cli: Databend Native CLI

Bindings

• python: Databend Python Client

• nodejs: Databend Node.js Client

• java: Databend Java Client (upcoming)

Installation for BendSQL

Installation script

curl -fsSL https://repo.databend.com/install/bendsql.sh | bash

or

curl -fsSL https://repo.databend.com/install/bendsql.sh | bash -s -- -y --prefix /usr/local

Cargo:

cargo-binstall is recommended:

cargo binstall bendsql

Or alternatively build from source:

cargo install bendsql

Homebrew:

brew install databendcloud/homebrew-tap/bendsql

Apt:

• Using DEB822-STYLE format on Ubuntu-22.04/Debian-12 and later:

sudo curl -L -o /etc/apt/sources.list.d/databend.sources https://repo.databend.com/deb/databend.sources

• Using old format on Ubuntu-20.04/Debian-11 and earlier:

sudo curl -L -o /usr/share/keyrings/databend-keyring.gpg https://repo.databend.com/deb/databend.gpg
sudo curl -L -o /etc/apt/sources.list.d/databend.list https://repo.databend.com/deb/databend.list

Then install bendsql:

sudo apt update

sudo apt install bendsql

Manually:

Check for latest version on GitHub Release

Usage

❯ bendsql --help
Databend Native Command Line Tool

Usage: bendsql [OPTIONS]

Options:
      --help                       Print help information
      --flight                     Using flight sql protocol, ignored when --dsn is set
      --tls <TLS>                  Enable TLS, ignored when --dsn is set [possible values: true, false]
  -h, --host <HOST>                Databend Server host, Default: 127.0.0.1, ignored when --dsn is set
  -P, --port <PORT>                Databend Server port, Default: 8000, ignored when --dsn is set
  -u, --user <USER>                Default: root, overrides username in DSN
  -p, --password <PASSWORD>        Password, overrides password in DSN [env: BENDSQL_PASSWORD]
  -r, --role <ROLE>                Downgrade role name, overrides role in DSN
  -D, --database <DATABASE>        Database name, overrides database in DSN
      --set <SET>                  Settings, overrides settings in DSN
      --dsn <DSN>                  Data source name [env: BENDSQL_DSN]
  -n, --non-interactive            Force non-interactive mode
  -A, --no-auto-complete           Disable loading tables and fields for auto-completion, which offers a quicker start
      --check                      Check for server status and exit
      --query=<QUERY>              Query to execute
  -d, --data <DATA>                Data to load, @file or @- for stdin. The `--query` should use the syntax: `INSERT FROM <table> from @_databend_load file_format=(<file_format_options>)`
  -o, --output <OUTPUT>            Output format [possible values: table, csv, tsv, null]
      --quote-style <QUOTE_STYLE>  Output quote style, applies to `csv` and `tsv` output formats [possible values: always, necessary, non-numeric, never]
      --progress                   Show progress for query execution in stderr, only works with output format `table` and `null`.
      --stats                      Show stats after query execution in stderr, only works with non-interactive mode.
      --time[=<TIME>]              Only show execution time without results, will implicitly set output format to `null`. [possible values: local, server]
  -l, --log-level <LOG_LEVEL>      [default: info]
  -V, --version                    Print version

Custom configuration

By default bendsql will read configuration from ~/.bendsql/config.toml and ~/.config/bendsql/config.toml sequentially if exists.

• Example file

❯ cat ~/.bendsql/config.toml
[connection]
host = "127.0.0.1"
tls = false

[connection.args]
connect_timeout = "30"

[settings]
display_pretty_sql = true
progress_color = "green"
no_auto_complete = true
prompt = ":) "

• Connection section

Parameter	Description
host	Server host to connect.
port	Server port to connect.
user	User name.
database	Which database to connect.
args	Additional connection args.

• Settings section

Parameter	Description
display_pretty_sql	Whether to display SQL queries in a formatted way.
prompt	The prompt to display before asking for input.
progress_color	The color to use for the progress bar.
show_progress	Whether to show a progress bar when executing queries.
show_stats	Whether to show statistics after executing queries.
no_auto_complete	Whether to disable loading tables and fields for auto-completion on startup.
max_display_rows	The maximum number of rows to display in table output format.
max_width	Limit display render box max width, 0 means default to the size of the terminal. 65535 means no limit for max_width
max_col_width	Limit display render each column max width, smaller than 3 means disable the limit.
output_format	The output format to use.
expand	Expand table format display, default auto, could be on/off/auto.
time	Whether to show the time elapsed when executing queries.
multi_line	Whether to allow multi-line input.
quote_string	Whether to quote string values in table output format, default false.
sql_delimiter	SQL delimiter, default ;.

Commands in REPL

Commands	Description
!exit	Exit bendsql
!quit	Exit bendsql
!configs	Show current settings
!set	Set settings
!source file	Source file and execute

Setting commands in REPL

We can use !set CMD_NAME VAL to update the Settings above in runtime, example:

❯ bendsql

:) !set display_pretty_sql false
:) !set max_display_rows 10
:) !set expand auto

DSN

Format:

databend[+flight]://user:[password]@host[:port]/[database][?sslmode=disable][&arg1=value1]

Examples:

• databend://root:@localhost:8000/?sslmode=disable&presign=detect

• databend://user1:password1@tnxxxx.gw.aws-us-east-2.default.databend.com:443/benchmark?warehouse=default&enable_dphyp=1

• databend+flight://root:@localhost:8900/database1?connect_timeout=10

Available Args

Common

Arg	Description
tenant	Tenant ID, Databend Cloud only.
warehouse	Warehouse name, Databend Cloud only.
sslmode	Set to disable if not using tls.
tls_ca_file	Custom root CA certificate path.
connect_timeout	Connect timeout in seconds

RestAPI Client

Arg	Description
wait_time_secs	Request wait time for page, default to 1
max_rows_in_buffer	Max rows for page buffer
max_rows_per_page	Max response rows for a single page
page_request_timeout_secs	Timeout for a single page request, default to 30
presign	Whether to enable presign for data loading, available arguments are auto/detect/on/off. Default to auto which only enable presign for Databend Cloud

FlightSQL Client

Arg	Description
query_timeout	Query timeout seconds
tcp_nodelay	Default to true
tcp_keepalive	Tcp keepalive seconds, default to 3600, set to 0 to disable keepalive
http2_keep_alive_interval	Keep alive interval in seconds, default to 300
keep_alive_timeout	Keep alive timeout in seconds, default to 20
keep_alive_while_idle	Default to true

Query Settings

see: Databend Query Settings

Development

Cargo fmt, clippy, deny

make check

Development mode

• For fast development: Run cd frontend && pnpm run dev in one terminal, then make dev-run in another
• For production builds: Use make build-frontend to create embedded assets
• Development mode uses BENDSQL_DEV_MODE=1 environment variable to proxy requests to Next.js dev server

Unit tests

make test

integration tests

Note: Docker and Docker Compose needed

make integration