Class: Rmap::Database

Inherits:
Object
  • Object
show all
Defined in:
lib/rmap/database.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection = {}, &block) ⇒ Database

Returns a new instance of Database.



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# File 'lib/rmap/database.rb', line 28

def initialize(connection={}, &block)
  self.connection = connection
  if !block.nil?
    instance_eval(&block)
  end
  @scopes = {}
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/rmap/database.rb', line 85

def method_missing name, *args
  table(name)
end

Class Method Details

.create(database, connection = {}) ⇒ Object 



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# File 'lib/rmap/database.rb', line 7

def self.create(database, connection = {})
  connection = {:host => "localhost", :username => "root", :password => ""}.merge connection
  Mysql2::Client.new(connection).query("create database `#{database}`");
  connection[:database] = database
  self.new(connection)
end

.drop(database, connection = {}) ⇒ Object 



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# File 'lib/rmap/database.rb', line 14

def self.drop(database, connection = {})
  connection = {:host => "localhost", :username => "root", :password => ""}.merge connection
  Mysql2::Client.new(connection).query("drop database `#{database}`");
end

.exists?(database, connection = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rmap/database.rb', line 24

def self.exists?(database, connection = {})
  list(connection).include? database.to_s
end

.list(connection = {}) ⇒ Object 



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# File 'lib/rmap/database.rb', line 19

def self.list(connection = {})
  connection = {:host => "localhost", :username => "root", :password => ""}.merge connection
  Mysql2::Client.new(connection).query("show databases", :as => :array).map{|a| a[0]}
end

Instance Method Details

#bindings ⇒ Object 



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# File 'lib/rmap/database.rb', line 64

def bindings
  binding
end

#client ⇒ Object 



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# File 'lib/rmap/database.rb', line 42

def client
  if @client.nil?
    @client = Mysql2::Client.new(@connection)
  end
  @client
end

#close ⇒ Object 



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# File 'lib/rmap/database.rb', line 57

def close
  if !@client.nil?
    @client.close
  end
  @client = nil
end

#commit_transaction ⇒ Object 



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# File 'lib/rmap/database.rb', line 105

def commit_transaction
  client.query("commit")
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rmap/database.rb', line 49

def connected?
  begin 
    client.ping && !client.query("select database()", :as => :array).first.first.nil?
  rescue Exception => e
    false
  end
end

#connection=(connection) ⇒ Object 



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# File 'lib/rmap/database.rb', line 36

def connection=(connection)
  @connection = {:host => "localhost", :username => "root", :password => ""}.merge connection
  close
  @table_names = nil
end

#create(name) ⇒ Object 



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# File 'lib/rmap/database.rb', line 89

def create(name)
  @table_names = nil
  client.query("create table `#{name}`(id int unsigned not null auto_increment primary key) engine = InnoDB")
end

#current_migration ⇒ Object 



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# File 'lib/rmap/database.rb', line 113

def current_migration
  if !table? :rmap_vars
    rmap_vars.add :key, :string
    rmap_vars.add :value, :binary
  end
  
  if rmap_vars.key_eq(:current_migration).count == 0
    rmap_vars.insert(:key => :current_migration, :value => 0)
    0
  else
    rmap_vars.key_eq(:current_migration).first.value.to_i
  end
end

#migrate(options = {}) ⇒ Object 



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# File 'lib/rmap/database.rb', line 127

def migrate(options = {})
  migrations_dir = !options[:migrations_dir].nil? ? (options[:migrations_dir].match(/\/\Z/) ? options[:migrations_dir] : "#{options[:migrations_dir]}/") : "#{Rmap::CONF_ROOT}/migrations/"
  
  current_migration = self.current_migration
  
  migrations = Dir.new(migrations_dir).to_a.find_all{|file| ::File.file? "#{migrations_dir}#{file}" }.map{ |file| Rmap::Migration.new("#{migrations_dir}#{file}") }.sort {|l,r| l.schema_version <=> r.schema_version}
  
  if migrations.count == 0
    raise "There are currently no migrations."
  end
  
  if options[:to].nil?
    to = migrations.last.schema_version
    if to == current_migration
      raise "There are no are more migrations that can be applied."
    end
  elsif options[:to].to_s == 'previous'
    if current_migration == 0
      raise "No migrations have been applied."
    elsif current_migration == migrations.first.schema_version
      to = 0
    else
      migrations.each_with_index do |migration, i|
        if current_migration == migration.schema_version
          to = migrations[i - 1]
          break
        end
      end
    end
  elsif options[:to].to_s == 'next'
    if current_migration == 0
      to = migrations.first.schema_version
    elsif current_migration == migrations.last.schema_version
      raise "There are no are more migrations that can be applied."
    end
    migrations.each_with_index do |migration, i|
      if current_migration == migration.schema_version
        to = migrations[i + 1]
        break
      end
    end
  else
    found = false
    to = options[:to].to_i
    
    if to == current_migration
      raise "Already at migration #{to}"
    end
    
    if to != 0
      migrations.each do |migration, i|
        if migration.schema_version == to
          found = true
          break
        end
      end
      
      if !found
        raise "No such migration '#{to}' exists"
      end
    end
  end
  
  if to > current_migration
    migrations.each do |migration|
      if migration.schema_version <= current_migration
        next
      end
      
      if migration.schema_version <= to
        run &migration.up_block
      else
        break
      end
    end
  else
    migrations.reverse.each do |migration|
      if migration.schema_version > current_migration
        next
      end
      if migration.schema_version > to
        run &migration.down_block
      else
        break
      end
    end
  end
  
  rmap_vars.key_eq(:current_migration).value = to
  
  self
end

#rollback_transaction ⇒ Object 



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# File 'lib/rmap/database.rb', line 109

def rollback_transaction
  client.query("rollback")
end

#run(file_path = nil, &block) ⇒ Object 



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# File 'lib/rmap/database.rb', line 68

def run(file_path = nil, &block)
  if !file_path.nil?
    instance_eval(::File.open(file_path).read, file_path)
  end
  if !block.nil?
    instance_eval(&block)
  end
end

#start_transaction ⇒ Object 



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# File 'lib/rmap/database.rb', line 101

def start_transaction
  client.query("start transaction")
end

#table(name) ⇒ Object 



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# File 'lib/rmap/database.rb', line 81

def table(name)
  Table.new(self, name.to_s)
end

#table?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rmap/database.rb', line 77

def table?(name)
  table_names.include?(name.to_s)
end

#table_names ⇒ Object 



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# File 'lib/rmap/database.rb', line 94

def table_names
  if @table_names.nil?
    @table_names = client.query("show tables", :as => :array).map{|a| a[0]}
  end
  @table_names
end