shard-crystal-sqlite3/README.md
2020-01-14 10:29:58 -03:00

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# crystal-sqlite3 [![Build Status](https://travis-ci.org/crystal-lang/crystal-sqlite3.svg?branch=master)](https://travis-ci.org/crystal-lang/crystal-sqlite3)
SQLite3 bindings for [Crystal](http://crystal-lang.org/).
Check [crystal-db](https://github.com/crystal-lang/crystal-db) for general db driver documentation. crystal-sqlite3 driver is registered under `sqlite3://` uri.
## Installation
Add this to your application's `shard.yml`:
```yml
dependencies:
sqlite3:
github: crystal-lang/crystal-sqlite3
```
### Usage
```crystal
require "sqlite3"
DB.open "sqlite3://./data.db" do |db|
db.exec "create table contacts (name text, age integer)"
db.exec "insert into contacts values (?, ?)", "John Doe", 30
args = [] of DB::Any
args << "Sarah"
args << 33
db.exec "insert into contacts values (?, ?)", args: args
puts "max age:"
puts db.scalar "select max(age) from contacts" # => 33
puts "contacts:"
db.query "select name, age from contacts order by age desc" do |rs|
puts "#{rs.column_name(0)} (#{rs.column_name(1)})"
# => name (age)
rs.each do
puts "#{rs.read(String)} (#{rs.read(Int32)})"
# => Sarah (33)
# => John Doe (30)
end
end
end
```
### DB::Any
* `Time` is implemented as `TEXT` column using `SQLite3::DATE_FORMAT` format.
* `Bool` is implemented as `INT` column mapping `0`/`1` values.