Class: Baza::Driver::Pg::Table

Inherits:
Table
  • Object
show all
Defined in:
lib/baza/driver/pg/table.rb

Instance Attribute Summary collapse

Attributes inherited from Table

#db

Instance Method Summary collapse

Methods inherited from Table

#<=>, #create_columns, #insert, #inspect, #row, #rows, #to_param, #to_s, #upsert_duplicate_key

Methods included from Baza::DatabaseModelFunctionality

#model_name, #to_model

Constructor Details

#initialize(driver:, data:) ⇒ Table

Returns a new instance of Table.



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# File 'lib/baza/driver/pg/table.rb', line 4

def initialize(driver:, data:)
  @db = driver.db
  @data = data
  @name = @data.fetch(:table_name)
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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

def name
  @name
end

Instance Method Details

#clone(newname, _args = {}) ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 240

def clone(newname, _args = {})
  raise "Invalid name." if newname.to_s.strip.empty?

  columns_list = []
  indexes_list = []

  columns do |column|
    columns_list << column.data
  end

  indexes do |index|
    data = index.data
    data.delete(:name)
    indexes_list << data
  end

  @db.tables.create(newname, columns: columns_list, indexes: indexes_list)

  clone_insert_from_original_table(newname, columns_list)

  @db.tables[newname]
end

#column(name) ⇒ Object

Raises:



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# File 'lib/baza/driver/pg/table.rb', line 68

def column(name)
  column = columns(name: name).first
  raise Baza::Errors::ColumnNotFound, "Column not found: #{name}" unless column
  column
end

#columns(args = {}) ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 42

def columns(args = {})
  where_args = {
    table_catalog: @db.opts[:db],
    table_name: name,
    table_schema: "public"
  }

  where_args[:column_name] = args.fetch(:name) if args[:name]

  columns_list = [] unless block_given?
  @db.select([:information_schema, :columns], where_args) do |column_data|
    column = Baza::Driver::Pg::Column.new(
      db: @db,
      data: column_data
    )

    if columns_list
      columns_list << column
    else
      yield column
    end
  end

  columns_list
end

#create_indexes(index_list, args = {}) ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 205

def create_indexes(index_list, args = {})
  db.indexes.create_index(index_list, args.merge(table_name: name))
end

#data ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 16

def data
  ret = {
    name: name,
    columns: [],
    indexes: []
  }

  columns do |column|
    ret[:columns] << column.data
  end

  indexes do |index|
    ret[:indexes] << index.data
  end

  ret
end

#database_name ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 34

def database_name
  @data.fetch(:table_catalog)
end

#drop ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 10

def drop
  @db.with_database(database_name) do
    @db.query("DROP TABLE #{@db.quote_table(name)}")
  end
end

#foreign_key(name) ⇒ Object

Raises:



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# File 'lib/baza/driver/pg/table.rb', line 165

def foreign_key(name)
  foreign_keys(name: name) do |foreign_key|
    return foreign_key
  end

  raise Baza::Errors::ForeignKeyNotFound, "Foreign key not found: #{name}"
end

#foreign_keys(args = {}) ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 79

def foreign_keys(args = {})
  sql = "
    SELECT
      tc.constraint_name,
      tc.table_name,
      kcu.column_name,
      ccu.table_name AS foreign_table_name,
      ccu.column_name AS foreign_column_name

    FROM
      information_schema.table_constraints AS tc

    JOIN information_schema.key_column_usage AS kcu ON
      tc.constraint_name = kcu.constraint_name

    JOIN information_schema.constraint_column_usage AS ccu
      ON ccu.constraint_name = tc.constraint_name

    WHERE
      constraint_type = 'FOREIGN KEY' AND
      tc.table_name = '#{@db.escape(name)}'
  "

  sql << " AND tc.constraint_name = '#{@db.escape(args.fetch(:name))}'" if args[:name]

  result = [] unless block_given?

  @db.query(sql) do |data|
    foreign_key = Baza::Driver::Pg::ForeignKey.new(
      db: @db,
      data: data
    )

    if block_given?
      yield foreign_key
    else
      result << foreign_key
    end
  end

  result
end

#index(name) ⇒ Object

Raises:



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# File 'lib/baza/driver/pg/table.rb', line 199

def index(name)
  index = indexes(name: name).first
  raise Baza::Errors::IndexNotFound unless index
  index
end

#indexes(args = {}) ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 173

def indexes(args = {})
  where_args = {
    tablename: name
  }

  where_args[:indexname] = args.fetch(:name) if args[:name]

  indexes_list = [] unless block_given?
  @db.select(:pg_indexes, where_args) do |index_data|
    index = Baza::Driver::Pg::Index.new(
      db: @db,
      data: index_data
    )

    next if index.primary?

    if indexes_list
      indexes_list << index
    else
      yield index
    end
  end

  indexes_list
end

#native? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/baza/driver/pg/table.rb', line 38

def native?
  name == "pg_stat_statements"
end

#optimize ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 235

def optimize
  @db.query("VACUUM #{@db.quote_table(name)}")
  self
end

#referenced_foreign_keys(args = {}) ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 122

def referenced_foreign_keys(args = {})
  sql = "
    SELECT
      tc.constraint_name,
      tc.table_name,
      kcu.column_name,
      ccu.table_name AS foreign_table_name,
      ccu.column_name AS foreign_column_name

    FROM
      information_schema.table_constraints AS tc

    JOIN information_schema.key_column_usage AS kcu ON
      tc.constraint_name = kcu.constraint_name

    JOIN information_schema.constraint_column_usage AS ccu
      ON ccu.constraint_name = tc.constraint_name

    WHERE
      constraint_type = 'FOREIGN KEY' AND
      ccu.table_name = '#{@db.escape(name)}'
  "

  sql << " AND tc.constraint_name = '#{@db.escape(args.fetch(:name))}'" if args[:name]

  result = [] unless block_given?

  @db.query(sql) do |data|
    foreign_key = Baza::Driver::Pg::ForeignKey.new(
      db: @db,
      data: data
    )

    if block_given?
      yield foreign_key
    else
      result << foreign_key
    end
  end

  result
end

#reload ⇒ Object

Raises:



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# File 'lib/baza/driver/pg/table.rb', line 215

def reload
  where_args = {
    table_catalog: @db.opts.fetch(:db),
    table_schema: "public",
    table_name: name
  }

  data = @db.single([:information_schema, :tables], where_args)
  raise Baza::Errors::TableNotFound unless data
  @data = data
  self
end

#rename(new_name) ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 209

def rename(new_name)
  @db.query("ALTER TABLE #{@db.quote_table(name)} RENAME TO #{@db.quote_table(new_name)}")
  @name = new_name.to_s
  self
end

#rows_count ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 228

def rows_count
  @db.databases.with_database(database_name) do
    sql = "SELECT COUNT(*) AS count FROM #{@db.quote_table(name)}"
    return @db.query(sql).fetch.fetch(:count).to_i
  end
end

#truncate ⇒ Object 



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# File 'lib/baza/driver/pg/table.rb', line 74

def truncate
  @db.query("TRUNCATE #{@db.quote_table(name)} RESTART IDENTITY")
  self
end