baza

A database abstraction layer for Ruby. Also supports JRuby.

Installation

Is fairly painless.

gem install baza

Or in your Gemfile:

gem 'baza'

Connection to a database.

MySQL

db = Baza::Db.new(type: :mysql2, host: "localhost", user: "my_user", pass: "my_password", port: 3306, db: "my_database")

PostgreSQL

db = Baza::Db.new(type: :pg, host: "localhost", user: "my_user", pass: "my_password", db: "my_database")

SQLite3

db = Baza::Db.new(type: :sqlite3, path: "/path/to/file.sqlite3")

Queries

Select

db.select(:users, {name: "Kasper"}, {orderby: "age"}) do |row|
  puts "Row: #{row}"
end

name = "Kasper"
db.q("SELECT * FROM users WHERE name = '#{db.esc(name)}' ORDER BY age") do |row|
  puts "Row: #{row}"
end

Inserting

db.insert(:users, {name: "Kasper", age: 27})
id = db.last_id

It can also return the ID at the same time

id = db.insert(:users, {name: "Kasper", age: 27}, return_id: true)

Inserting multiple rows in one query is also fairly painless:

db.insert_multi(:users, [
  {name: "Kasper", age: 27},
  {name: "Christina", age: 25},
  {name: "Charlotte", age: 23}
])

Update

db.update(:users, {name: "Kasper Johansen"}, {name: "Kasper"})

Delete

db.delete(:users, name: "Kasper")

Upsert

The following example handels a row that will be inserted with "Kasper", age: 27 if it doesnt exist or rows with "Kasper" will have their their age updated to 27.

db.upsert(:users, {name: "Kasper"}, {age: 27})

Structure

Database creation

db.databases.create(name: "test-db")

Database renaming

database = db.databases["test-db"]
database.name = "new-name"
database.save!

Listing databases

db.databases.list.each do |database|
  puts "Database: #{database.name}"
end

Listing tables on non-used-database

database = db.database["test-db"]
database.tables.each do |table|
  puts "TableName: #{table.name}"
  puts "Columns: #{table.columns.map(&:name)}"
end

Table creation

db.tables.create(:users, {
  columns: [
    {name: :id, type: :int, autoincr: true, primarykey: true},
    {name: :name, type: :varchar}
  ],
  indexes: [
    :name
  ]
})

Table dropping

table = db.tables[:users]
table.drop

Table listing

array_of_tables = db.tables.list

Or you can use blocks:

db.tables.list do |table|
  puts "Table-name: #{table.name}"
end

Table renaming

table = db.tables[:users]
table.rename(:new_table_name)

Table optimizing

table.optimize

Table rows counting

table.rows_count

Column listing

table = db.tables["users"]
cols = table.columns

Or a specific column:

column = table.column(:id)
puts "Column: #{column.name} #{column.type}(#{column.maxlength})"
puts "Default: #{column.default}"

Column altering

column.change(name: "newname", type: :varchar, default: "")

Drop column

column.drop

Get an index by name

index = table.index("index_name")

Rename index

index.rename("new name")

Dropping an index

index.drop

Getting various data from an index

puts "Unique: #{index.unique?}"
puts "Primary: #{index.primary?}"
puts "Autoincr: #{index.autoincr?}"
puts "Table: #{index.table}"

Copying databases

db_mysql = Baza::Db.new(type: :mysql, ...)
db_mysql2 = Baza::Db.new(type: :mysql2, ...)
db_sqlite = Baza::Db.new(type: :sqlite3, path: ...)

db_mysql.copy_to(db_sqlite)

Dumping SQL to an IO

db = Baza::Db.new(...)
dump = Baza::Dump.new(db: db)
str_io = StringIO.new
dump.dump(str_io)

Transactions

db.transaction do
  1000.times do
    db.insert(:users, name: "Kasper")
  end
end

Users

Listing users

db.users.list do |user|
  puts "User found: #{user.name}"
end

root_user = db.users.find_by_name("root")
root_user.name #=> "root"

Dropping users

user.drop

Creating users

user = db.users.create(name: "myuser", host: "localhost")

Query Buffer

In order to speed things up, but without using transactions directly, you can use a query buffer. This stores various instructions in memory and flushes them every now and then through transactions or intelligent queries (like multi-insertion). The drawback is that it will not be possible to test the queries for errors before a flush is executed and it wont be possible to read results from any of the queries.

It is fairly simple do:

db.q_buffer do |buffer|
  100_000.times do |count|
    buffer.insert(:table_name, name: "Kasper #{count}")

    buffer.query("UPDATE table SET ...")
    buffer.query("DELETE FROM table WHERE ...")
  end
end

Contributing to baza

Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet.
Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it.
Fork the project.
Start a feature/bugfix branch.
Commit and push until you are happy with your contribution.
Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.