shard-crystal-db/README.md

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[![Build Status](https://travis-ci.org/crystal-lang/crystal-db.svg?branch=master)](https://travis-ci.org/crystal-lang/crystal-db)
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# crystal-db
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Common db api for crystal. You will need to have a specific driver to access a database.
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* [sqlite](https://github.com/crystal-lang/crystal-sqlite3)
* [mysql](https://github.com/crystal-lang/crystal-mysql)
* [postgres](https://github.com/will/crystal-pg)
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* [cassandra](https://github.com/kaukas/crystal-cassandra)
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## Installation
Add this to your application's `shard.yml`:
```yaml
dependencies:
db:
github: crystal-lang/crystal-db
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```
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## Documentation
* [Latest API](http://crystal-lang.github.io/crystal-db/api/latest/)
* [Crystal book](https://crystal-lang.org/docs/database/)
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## Usage
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Since this is an abstract db api, its usage is through a concrete database driver.
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```crystal
require "db"
require "sqlite3"
DB.open "sqlite3:./file.db" do |db|
# When using the pg driver, use $1, $2, etc. instead of ?
db.exec "create table contacts (name text, age integer)"
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db.exec "insert into contacts values (?, ?)", "John Doe", 30
args = [] of DB::Any
args << "Sarah"
args << 33
db.exec "insert into contacts values (?, ?)", 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
```
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## Roadmap
Issues not yet addressed
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- [x] Support non prepared statements. [#25](https://github.com/crystal-lang/crystal-db/pull/25)
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- [x] Time data type. (implementation details depends on actual drivers)
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- [x] Data type extensibility. Allow each driver to extend the data types allowed.
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- [x] Transactions & nested transactions. [#27](https://github.com/crystal-lang/crystal-db/pull/27)
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- [x] Connection pool.
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- [ ] Direct access to `IO` to avoid memory allocation for blobs.
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## Contributing
1. Fork it ( https://github.com/crystal-lang/crystal-db/fork )
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2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request
## Contributors
- [bcardiff](https://github.com/bcardiff) Brian J. Cardiff - creator, maintainer