Class: Sequel::SQLite::Dataset

Inherits:

Dataset

• Object
• Dataset
• Sequel::SQLite::Dataset

Defined in:

lib/sequel_core/adapters/sqlite.rb

Constant Summary

EXPLAIN =

'EXPLAIN %s'.freeze

Constants inherited from Dataset

Dataset::AND_SEPARATOR, Dataset::BOOL_FALSE, Dataset::BOOL_TRUE, Dataset::COLUMN_CHANGE_OPTS, Dataset::COLUMN_REF_RE1, Dataset::COLUMN_REF_RE2, Dataset::COLUMN_REF_RE3, Dataset::COMMA_SEPARATOR, Dataset::COUNT_FROM_SELF_OPTS, Dataset::COUNT_OF_ALL_AS_COUNT, Dataset::DATASET_CLASSES, Dataset::DATE_FORMAT, Dataset::MUTATION_METHODS, Dataset::NOTIMPL_MSG, Dataset::NULL, Dataset::N_ARITY_OPERATORS, Dataset::QUESTION_MARK, Dataset::STOCK_COUNT_OPTS, Dataset::STOCK_TRANSFORMS, Dataset::TIMESTAMP_FORMAT, Dataset::TWO_ARITY_OPERATORS, Dataset::WILDCARD

Instance Attribute Summary

Attributes inherited from Dataset

#db, #opts, #quote_identifiers, #row_proc

Instance Method Summary

• #complex_expression_sql(op, args) ⇒ Object
• #delete(opts = nil) ⇒ Object
• #explain ⇒ Object
• #fetch_rows(sql, &block) ⇒ Object
• #insert(*values) ⇒ Object
• #insert_sql(*values) ⇒ Object
• #literal(v) ⇒ Object
• #quoted_identifier(c) ⇒ Object
• #update(*args, &block) ⇒ Object

Methods inherited from Dataset

#<<, #[], #[]=, #aliased_expression_sql, #all, #and, #as, #avg, #case_expression_sql, #clone, #column_all_sql, #columns, #columns!, #count, #create_or_replace_view, #create_view, dataset_classes, #def_mutation_method, def_mutation_method, #delete_sql, #each, #each_page, #empty?, #except, #exclude, #exists, #filter, #first, #first_source, #from, #from_self, #function_sql, #get, #graph, #grep, #group, #group_and_count, #having, inherited, #initialize, #insert_multiple, #inspect, #intersect, #interval, #invert, #irregular_function_sql, #join_clause_sql, #join_on_clause_sql, #join_table, #join_using_clause_sql, #last, #limit, #map, #max, #min, #model_classes, #multi_insert, #multi_insert_sql, #naked, #or, #order, #order_more, #ordered_expression_sql, #paginate, #polymorphic_key, #print, #qualified_identifier_sql, #query, #quote_identifier, #quote_identifiers?, #range, #reverse_order, #select, #select_all, #select_more, #select_sql, #set, #set_graph_aliases, #set_model, #single_record, #single_value, #subscript_sql, #sum, #symbol_to_column_ref, #table_exists?, #to_csv, #to_hash, #transform, #transform_load, #transform_save, #unfiltered, #union, #uniq, #unordered, #update_sql

Methods included from Enumerable

#send_each

Constructor Details

This class inherits a constructor from Sequel::Dataset

Instance Method Details

#complex_expression_sql(op, args) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 208

def complex_expression_sql(op, args)
  case op
  when :~, :'!~', :'~*', :'!~*'
    raise Error, "SQLite does not support pattern matching via regular expressions"
  when :LIKE, :'NOT LIKE', :ILIKE, :'NOT ILIKE'
    # SQLite is case insensitive for ASCII, and non case sensitive for other character sets
    "#{'NOT ' if [:'NOT LIKE', :'NOT ILIKE'].include?(op)}(#{literal(args.at(0))} LIKE #{literal(args.at(1))})"
  else
    super(op, args)
  end
end

#delete(opts = nil) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 248

def delete(opts = nil)
  # check if no filter is specified
  unless (opts && opts[:where]) || @opts[:where]
    @db.transaction do
      unfiltered_count = count
      @db.execute delete_sql(opts)
      unfiltered_count
    end
  else
    @db.execute delete_sql(opts)
  end
end

#explain ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 263

def explain
  res = []
  @db.result_set(EXPLAIN % select_sql(opts), nil) {|r| res << r}
  res
end

#fetch_rows(sql, &block) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 228

def fetch_rows(sql, &block)
  @db.execute_select(sql) do |result|
    @columns = result.columns.map {|c| c.to_sym}
    column_count = @columns.size
    result.each do |values|
      row = {}
      column_count.times {|i| row[@columns[i]] = values[i]}
      block.call(row)
    end
  end
end

#insert(*values) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 240

def insert(*values)
  @db.execute_insert insert_sql(*values)
end

#insert_sql(*values) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 220

def insert_sql(*values)
  if (values.size == 1) && values.first.is_a?(Sequel::Dataset)
    "INSERT INTO #{source_list(@opts[:from])} #{values.first.sql};"
  else
    super(*values)
  end
end

#literal(v) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 193

def literal(v)
  case v
  when LiteralString
    v
  when String
    "'#{::SQLite3::Database.quote(v)}'"
  when Time
    literal(v.iso8601)
  when Date, DateTime
    literal(v.to_s)
  else
    super
  end
end

#quoted_identifier(c) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 189

def quoted_identifier(c)
  "`#{c}`"
end

#update(*args, &block) ⇒ Object

# File 'lib/sequel_core/adapters/sqlite.rb', line 244

def update(*args, &block)
  @db.execute update_sql(*args, &block)
end