Class: Sequel::SQLite::Dataset

Inherits:
Dataset show all
Includes:
DatasetMethods
Defined in:
lib/sequel_core/adapters/sqlite.rb

Overview

Dataset class for SQLite datasets that use the ruby-sqlite3 driver.

Defined Under Namespace

Modules: ArgumentMapper, PreparedStatementMethods

Constant Summary collapse

EXPLAIN = 
'EXPLAIN %s'.freeze
PREPARED_ARG_PLACEHOLDER = 
':'.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 collapse

Methods included from DatasetMethods

#complex_expression_sql, #delete, #insert, #insert_sql, #quoted_identifier

Methods inherited from Dataset

#<<, #[], #[]=, #aliased_expression_sql, #all, #and, #as, #avg, #case_expression_sql, #clone, #column_all_sql, #columns, #columns!, #complex_expression_sql, #count, #create_or_replace_view, #create_view, dataset_classes, #def_mutation_method, def_mutation_method, #delete, #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, #insert_multiple, #insert_sql, #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?, #quoted_identifier, #range, #reverse_order, #select, #select_all, #select_more, #select_sql, #server, #set, #set_defaults, #set_graph_aliases, #set_model, #set_overrides, #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, #update_sql

Methods included from Enumerable

#send_each

Constructor Details

This class inherits a constructor from Sequel::Dataset

Instance Method Details

#call(type, hash, values = nil, &block) ⇒ Object

Prepare an unnamed statement of the given type and call it with the given values.



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# File 'lib/sequel_core/adapters/sqlite.rb', line 179

def call(type, hash, values=nil, &block)
  prepare(type, nil, values).call(hash, &block)
end

#explain ⇒ Object

Return an array of strings specifying a query explanation for the current dataset.



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# File 'lib/sequel_core/adapters/sqlite.rb', line 185

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

#fetch_rows(sql) ⇒ Object

Yield a hash for each row in the dataset.



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# File 'lib/sequel_core/adapters/sqlite.rb', line 192

def fetch_rows(sql)
  execute(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]}
      yield row
    end
  end
end

#literal(v) ⇒ Object

Use the ISO format for dates and timestamps, and quote strings using the ::SQLite3::Database.quote method.



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# File 'lib/sequel_core/adapters/sqlite.rb', line 206

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

#prepare(type, name, values = nil) ⇒ Object

Prepare the given type of query with the given name and store it in the database. Note that a new native prepared statement is created on each call to this prepared statement.



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# File 'lib/sequel_core/adapters/sqlite.rb', line 224

def prepare(type, name, values=nil)
  ps = to_prepared_statement(type, values)
  ps.extend(PreparedStatementMethods)
  db.prepared_statements[name] = ps if name
  ps
end