Class: Baza::Driver::Pg::Database

Inherits:
Baza::Database show all
Defined in:
lib/baza/driver/pg/database.rb

Constant Summary collapse

CREATE_ALLOWED_KEYS = 
[:columns, :indexes, :temp, :return_sql].freeze

Instance Attribute Summary

Attributes inherited from Baza::Database

#db, #driver, #name, #name_was

Instance Method Summary collapse

Methods inherited from Baza::Database

#import_file!, #initialize, #table_exists?, #to_param

Methods included from Baza::DatabaseModelFunctionality

#model_name, #to_model

Constructor Details

This class inherits a constructor from Baza::Database

Instance Method Details

#create_table(table_name, data, args = nil) ⇒ Object

Creates a new table by the given name and data.



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# File 'lib/baza/driver/pg/database.rb', line 65

def create_table(table_name, data, args = nil)
  table_name = table_name.to_s
  raise "No columns was given for '#{name}'." if !data[:columns] || data[:columns].empty?

  sql = "CREATE"
  sql << " TEMPORARY" if data[:temp]
  sql << " TABLE #{db.sep_table}#{@db.escape_table(table_name)}#{db.sep_table} ("

  first = true
  data.fetch(:columns).each do |col_data|
    sql << ", " unless first
    first = false if first
    col_data.delete(:after) if col_data[:after]
    sql << @db.columns.data_sql(col_data)
  end

  sql << ")"

  use { @db.query(sql) } if !args || !args[:return_sql]

  if data[:indexes] && !data[:indexes].empty?
    table = @db.tables[table_name]
    table.create_indexes(data.fetch(:indexes))
  end

  return [sql] if args && args[:return_sql]
end

#drop ⇒ Object 



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# File 'lib/baza/driver/pg/database.rb', line 7

def drop
  other_db = @db.databases.list.find { |database| database.name != @db.current_database }

  # Drop database through a cloned connection, because Postgres might bug up if dropping the current
  @db.clone_conn(db: other_db.name) do |cloned_conn|
    # Close existing connections to avoid 'is being accessed by other users' errors
    cloned_conn.query("REVOKE CONNECT ON DATABASE #{@db.sep_database}#{@db.escape_database(name)}#{@db.sep_database} FROM public")
    cloned_conn.query("SELECT pid, pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = #{@db.sep_val}#{@db.esc(name)}#{@db.sep_val} AND pid != pg_backend_pid()")

    # Drop the database
    cloned_conn.query("DROP DATABASE #{@db.sep_database}#{@db.escape_database(name)}#{@db.sep_database}")
  end

  self
end

#rename(new_name) ⇒ Object 



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# File 'lib/baza/driver/pg/database.rb', line 93

def rename(new_name)
  @db.query("ALTER DATABASE #{@db.sep_database}#{@db.escape_database(name_was)}#{@db.sep_database} RENAME TO #{@db.sep_database}#{@db.escape_database(new_name)}#{@db.sep_database}")
  @name = new_name.to_s
  self
end

#save! ⇒ Object 



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# File 'lib/baza/driver/pg/database.rb', line 2

def save!
  rename(name) unless name.to_s == name_was
  self
end

#table(table_name) ⇒ Object

Raises:



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# File 'lib/baza/driver/pg/database.rb', line 23

def table(table_name)
  table = tables(name: table_name).first
  raise Baza::Errors::TableNotFound unless table
  table
end

#tables(args = {}) ⇒ Object 



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# File 'lib/baza/driver/pg/database.rb', line 29

def tables(args = {})
  tables_list = [] unless block_given?

  where_args = {
    table_catalog: name,
    table_schema: "public"
  }
  where_args[:table_name] = args.fetch(:name) if args[:name]

  use do
    @db.select([:information_schema, :tables], where_args, orderby: :table_name) do |table_data|
      table = Baza::Driver::Pg::Table.new(
        driver: @db.driver,
        data: table_data
      )

      next if table.native?

      if tables_list
        tables_list << table
      else
        yield table
      end
    end
  end

  tables_list
end

#use(&blk) ⇒ Object 



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# File 'lib/baza/driver/pg/database.rb', line 58

def use(&blk)
  @db.with_database(name, &blk)
  self
end