kellylg / csvq

SQL-like query language for csv

csvq

SQL-like query language for csv

csvq is a command line tool to operate CSV files. You can read, update, delete CSV records with SQL-like query.

You can also execute multiple operations sequentially in managed transactions by passing a procedure or using the interactive shell. In the multiple operations, you can use variables, cursors, temporary tables, and other features.

Features

• CSV File Operation

  • Select Query
  • Insert Query
  • Update Query
  • Replace Query
  • Delete Query
  • Create Table Query
  • Alter Table Query

• Cursor

• Temporary Table

• Transaction Management

• Support loading data from Standard Input

• Support following file formats

  • CSV
  • TSV
  • LTSV
  • Fixed-Length Format
  • JSON

• Support following file encodings

  • UTF-8
  • UTF-16
  • Shift_JIS

  JSON Format supports only UTF-8.

Reference Manual

Reference Manual - csvq

Installation

Install executable binary

1. Download an archive file from release page.
2. Extract the downloaded archive and add a binary file in it to your path.

Build from source

Requirements

Go 1.11 or later (ref. Getting Started - The Go Programming Language)

Build with one of the following ways

Use go get

1. $ go get github.com/mithrandie/csvq

Build with strict dependencies

1. $ go get -d github.com/mithrandie/csvq
2. Change directory to $GOPATH/src/github.com/mithrandie/csvq
3. $ env GO111MODULE=on go install

Install using package manager

Installing using a package manager does not ensure that you always get the latest version, but it may make installation and updating easier.

Ubuntu

1. $ sudo add-apt-repository ppa:mithrandie/csvq
2. $ sudo apt update
3. $ sudo apt install csvq

macOS (unofficial)

1. Install homebrew (ref. The missing package manager for macOS (or Linux) — Homebrew)
2. $ brew install csvq

Usage

# Simple query
csvq "select id, name from `user.csv`"
csvq "select id, name from user"

# Specify data delimiter as tab character
csvq -d "\t" "select count(*) from `user.csv`"

# Load no-header-csv
csvq --no-header "select c1, c2 from user"

# Load from redirection or pipe
csvq "select * from stdin" < user.csv
cat user.csv | csvq "select *"

# Load from Fixed-Length Format
cat /var/log/syslog | csvq -n -i fixed -m "[15, 24, 124]" "select *"

# Split lines with spaces automatically
ps | csvq -i fixed -m spaces "select * from stdin"

# Output in JSON format
csvq -f json "select integer(id) as id, name from user"

# Output to a file
csvq -o new_user.csv "select id, name from user"

# Load statements from file
$ cat statements.sql
VAR @id := 0;
SELECT @id := @id + 1 AS id,
       name
  FROM user;

$ csvq -s statements.sql

# Execute statements in the interactive shell
$ csvq
csvq > UPDATE users SET name = 'Mildred' WHERE id = 2;
1 record updated on "/home/mithrandie/docs/csv/users.csv".
csvq > COMMIT;
Commit: file "/home/mithrandie/docs/csv/users.csv" is updated.
csvq > EXIT;

# Show help
csvq -h

More details >> https://mithrandie.github.io/csvq

Execute csvq statements in Go

csvq-driver

Example of cooperation with other applications

• csvq emacs extension