zchee / spanner-cli

Interactive command line tool for Cloud Spanner

spanner-cli

Interactive command line tool for Cloud Spanner.

Description

spanner-cli is an interactive command line tool for Google Cloud Spanner.
You can control your Spanner databases with idiomatic SQL commands.

Install

If you have go, you can install using go get.

go get -u github.com/cloudspannerecosystem/spanner-cli

Otherwise, you can download the binary from the releases page.

Usage

Usage:
  spanner-cli [OPTIONS]

spanner:
  -p, --project=    (required) GCP Project ID.
  -i, --instance=   (required) Cloud Spanner Instance ID
  -d, --database=   (required) Cloud Spanner Database ID.
  -e, --execute=    Execute SQL statement and quit.
  -f, --file=       Execute SQL statement from file and quit.
  -t, --table       Display output in table format for batch mode.
  -v, --verbose     Display verbose output.
      --credential= Use the specific credential file
      --prompt=     Set the prompt to the specified format

Help Options:
  -h, --help        Show this help message

Unless you specify a credential file with --credential, this tool uses Application Default Credentials as credential source to connect to Spanner databases.
Please make sure to prepare your credential by gcloud auth application-default login.

Example

Interactive mode

$ spanner-cli -p myproject -i myinstance -d mydb
Connected.
spanner> CREATE TABLE users (
      ->   id INT64 NOT NULL,
      ->   name STRING(16) NOT NULL,
      ->   active BOOL NOT NULL
      -> ) PRIMARY KEY (id);
Query OK, 0 rows affected (30.60 sec)

spanner> SHOW TABLES;
+----------------+
| Tables_in_mydb |
+----------------+
| users          |
+----------------+
1 rows in set (18.66 msecs)

spanner> INSERT INTO users (id, name, active) VALUES (1, "foo", true), (2, "bar", false);
Query OK, 2 rows affected (5.08 sec)

spanner> SELECT * FROM users ORDER BY id ASC;
+----+------+--------+
| id | name | active |
+----+------+--------+
| 1  | foo  | true   |
| 2  | bar  | false  |
+----+------+--------+
2 rows in set (3.09 msecs)

spanner> BEGIN;
Query OK, 0 rows affected (0.02 sec)

spanner(rw txn)> DELETE FROM users WHERE active = false;
Query OK, 1 rows affected (0.61 sec)

spanner(rw txn)> COMMIT;
Query OK, 0 rows affected (0.20 sec)

spanner> SELECT * FROM users ORDER BY id ASC;
+----+------+--------+
| id | name | active |
+----+------+--------+
| 1  | foo  | true   |
+----+------+--------+
1 rows in set (2.58 msecs)

spanner> DROP TABLE users;
Query OK, 0 rows affected (25.20 sec)

spanner> SHOW TABLES;
Empty set (2.02 msecs)

spanner> EXIT;
Bye

Batch mode

By passing SQL from standard input, spanner-cli runs in batch mode.

$ echo 'SELECT * FROM users;' | spanner-cli -p myproject -i myinstance -d mydb
id      name    active
1       foo     true
2       bar     false

You can also pass SQL with command line option -e.

$ spanner-cli -p myproject -i myinstance -d mydb -e 'SELECT * FROM users;'
id      name    active
1       foo     true
2       bar     false

With -t option, results are displayed in table format.

$ spanner-cli -p myproject -i myinstance -d mydb -e 'SELECT * FROM users;' -t
+----+------+--------+
| id | name | active |
+----+------+--------+
| 1  | foo  | true   |
| 2  | bar  | false  |
+----+------+--------+

Syntax

The syntax is case-insensitive.
\G delimiter is also supported for dispalying results vertically.

Usage	Syntax	Note
List databases	SHOW DATABASES;
Switch database	USE <database>;
Create database	CREATE DATABSE <database>;
Drop database	DROP DATABASE <database>;
List tables	SHOW TABLES;
Show table schema	SHOW CREATE TABLE <table>;
Show columns	SHOW COLUMNS FROM <table>;
Show indexes	SHOW INDEX FROM <table>;
Create table	CREATE TABLE ...;
Change table schema	ALTER TABLE ...;
Delete table	DROP TABLE ...;
Create index	CREATE INDEX ...;
Delete index	DROP INDEX ...;
Query	SELECT ...;
DML	INSERT / UPDATE / DELETE ...;
Partitioned DML		Not supported yet
Show Query Execution Plan	EXPLAIN SELECT ...;
Start Read-Write Transaction	BEGIN (RW);
Commit Read-Write Transaction	COMMIT;
Rollback Read-Write Transaction	ROLLBACK;
Start Read-Only Transaction	BEGIN RO;
Start Read-Only Transaction (Exact Staleness)	BEGIN RO <seconds>;
Start Read-Only Transaction (Read Timestamp)	BEGIN RO <RFC3339-formatted time>;	See RFC3339 (ISO 8601)
End Read-Only Transaction	CLOSE;
Exit CLI	EXIT;

Customize prompt

You can customize the prompt by --prompt option.
There are some defined variables for being used in prompt.

Variables:

• \p : GCP Project ID
• \i : Cloud Spanner Instance ID
• \d : Cloud Spanner Database ID
• \t : In transaction

Example:

$ spanner-cli -p myproject -i myinstance -d mydb --prompt='[\p:\i:\d]\t> '
Connected.
[myproject:myinstance:mydb]> SELECT * FROM users ORDER BY id ASC;
+----+------+--------+
| id | name | active |
+----+------+--------+
| 1  | foo  | true   |
| 2  | bar  | false  |
+----+------+--------+
2 rows in set (3.09 msecs)

[myproject:myinstance:mydb]> begin;
Query OK, 0 rows affected (0.08 sec)

[myproject:myinstance:mydb](rw txn)> ...

The default prompt is spanner\t> .

Config file

This tool supports a configuration file called spanner_cli.cnf, similar to my.cnf.
The config file path must be ~/.spanner_cli.cnf.
In the config file, you can set default option values for command line options.

Example:

[spanner]
project = myproject
instance = myinstance
prompt = "[\\p:\\i:\\d]\\t> "

How to develop

Run unit tests.

$ make test

Run integration tests, which connects to real Cloud Spanner database.

$ PROJECT=${PROJECT_ID} INSTANCE=${INSTANCE_ID} DATABASE=${DATABASE_ID} CREDENTIAL=${CREDENTIAL} make test

TODO

• Show secondary index by "SHOW CREATE TABLE"

Disclaimer

Do not use this tool for production databases as the tool is still alpha quality.

Please feel free to report issues and send pull requests, but note that this application is not officially supported as part of the Cloud Spanner product.