Class: Migrate::Storage::Postgres

Inherits:
DB
  • Object
show all
Defined in:
lib/migrate/storage/postgres.rb

Instance Attribute Summary

Attributes inherited from DB

#config

Instance Method Summary collapse

Methods inherited from DB

#current_version, #delete, #get_migration, #list_migrations, #log_down, #log_up, #lowest_version, #migrations_range, #new_migration, #next_version, #prev_version, #print, #type

Constructor Details

#initialize(*args) ⇒ Postgres

Returns a new instance of Postgres.



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# File 'lib/migrate/storage/postgres.rb', line 6

def initialize(*args)
  super
  @conn = PG.connect({
    dbname: @config.database,
    host: @config.host,
    user: @config.user,
    password: @config.password,
  })
end

Instance Method Details

#create_tables ⇒ Object 



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# File 'lib/migrate/storage/postgres.rb', line 16

def create_tables
  Log.info("Creating version table")
  self.exec_sql "  CREATE TABLE \#{@config.version_info}\n  (\n    version SERIAL PRIMARY KEY NOT NULL,\n    description TEXT,\n    created_date TIMESTAMP WITH TIME ZONE NOT NULL,\n    last_up TIMESTAMP WITH TIME ZONE,\n    last_down TIMESTAMP WITH TIME ZONE\n  );\n  CREATE UNIQUE INDEX \#{@config.version_info}_version_uindex ON \#{@config.version_info} (version);\n\n  CREATE TABLE \#{@config.version_number}\n  (\n    version INT PRIMARY KEY NOT NULL\n  );\n\n  INSERT INTO \#{@config.version_number} VALUES(0);\n  eos\n  Log.success(\"Version table created\")\nend\n"

#exec_sql(sql) ⇒ Object 



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# File 'lib/migrate/storage/postgres.rb', line 48

def exec_sql(sql)
  @tx.exec sql
end

#extract_version(results) ⇒ Object 



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# File 'lib/migrate/storage/postgres.rb', line 40

def extract_version(results)
  if results && results.count > 0
    results[0]["version"]
  else
    raise VersionNotFound
  end
end

#has_tx ⇒ Object 



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# File 'lib/migrate/storage/postgres.rb', line 52

def has_tx
  @tx != nil
end

#tx ⇒ Object 



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# File 'lib/migrate/storage/postgres.rb', line 56

def tx
  if has_tx
    yield
  else
    begin
      @conn.transaction do |tx|
        @tx = tx
        yield
      end
    ensure
      @tx = nil
    end
  end
end