Class: Sequel::MySQL::Dataset

Inherits:
Dataset show all
Includes:
DatasetMethods, PreparedStatements::DatasetMethods
Defined in:
lib/sequel/adapters/mysql.rb

Overview

Dataset class for MySQL datasets accessed via the native driver.

Constant Summary

Constants included from DatasetMethods

Sequel::MySQL::DatasetMethods::BOOL_FALSE, Sequel::MySQL::DatasetMethods::BOOL_TRUE, Sequel::MySQL::DatasetMethods::COMMA_SEPARATOR, Sequel::MySQL::DatasetMethods::DELETE_CLAUSE_METHODS, Sequel::MySQL::DatasetMethods::FOR_SHARE, Sequel::MySQL::DatasetMethods::INSERT_CLAUSE_METHODS, Sequel::MySQL::DatasetMethods::SELECT_CLAUSE_METHODS, Sequel::MySQL::DatasetMethods::SQL_CALC_FOUND_ROWS, Sequel::MySQL::DatasetMethods::UPDATE_CLAUSE_METHODS

Constants inherited from Dataset

Dataset::ACTION_METHODS, Dataset::AND_SEPARATOR, Dataset::ARG_BLOCK_ERROR_MSG, Dataset::ARRAY_ACCESS_ERROR_MSG, 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::CONDITIONED_JOIN_TYPES, Dataset::COUNT_FROM_SELF_OPTS, Dataset::COUNT_OF_ALL_AS_COUNT, Dataset::DATASET_ALIAS_BASE_NAME, Dataset::DELETE_CLAUSE_METHODS, Dataset::FOR_UPDATE, Dataset::IMPORT_ERROR_MSG, Dataset::INSERT_CLAUSE_METHODS, Dataset::IS_LITERALS, Dataset::IS_OPERATORS, Dataset::JOIN_METHODS, Dataset::MUTATION_METHODS, Dataset::NON_SQL_OPTIONS, Dataset::NOTIMPL_MSG, Dataset::NULL, Dataset::N_ARITY_OPERATORS, Dataset::PREPARED_ARG_PLACEHOLDER, Dataset::QUALIFY_KEYS, Dataset::QUERY_METHODS, Dataset::QUESTION_MARK, Dataset::SELECT_CLAUSE_METHODS, Dataset::SQL_WITH, Dataset::STANDARD_TIMESTAMP_FORMAT, Dataset::TIMESTAMP_FORMAT, Dataset::TWO_ARITY_OPERATORS, Dataset::UNCONDITIONED_JOIN_TYPES, Dataset::UPDATE_CLAUSE_METHODS, Dataset::WILDCARD

Instance Attribute Summary

Attributes inherited from Dataset

#db, #identifier_input_method, #identifier_output_method, #opts, #quote_identifiers, #row_proc

Instance Method Summary collapse

Methods included from PreparedStatements::DatasetMethods

#call, #prepare

Methods included from Dataset::StoredProcedures

#call_sproc, #prepare_sproc

Methods included from DatasetMethods

#calc_found_rows, #complex_expression_sql, #distinct, #for_share, #full_text_search, #full_text_sql, #having, #insert_ignore, #join_table, #join_type_sql, #multi_insert_sql, #on_duplicate_key_update, #provides_accurate_rows_matched?, #quoted_identifier, #replace_sql, #supports_distinct_on?, #supports_intersect_except?, #supports_modifying_joins?, #supports_ordered_distinct_on?, #supports_timestamp_usecs?

Methods inherited from Dataset

#<<, #==, #[], #[]=, #add_graph_aliases, #aliased_expression_sql, #all, #and, #array_sql, #avg, #bind, #boolean_constant_sql, #call, #case_expression_sql, #cast_sql, clause_methods, #clone, #column_all_sql, #columns, #columns!, #complex_expression_sql, #constant_sql, #count, #def_mutation_method, def_mutation_method, #delete_sql, #distinct, #each, #each_page, #each_server, #empty?, #eql?, #except, #exclude, #exclude_having, #exclude_where, #exists, #filter, #first, #first_source, #first_source_alias, #first_source_table, #for_update, #from, #from_self, #function_sql, #get, #grep, #group, #group_and_count, #group_by, #hash, #having, #import, #initialize, #insert_multiple, #insert_sql, #inspect, #intersect, #interval, introspect_all_columns, #invert, #join, #join_clause_sql, #join_on_clause_sql, #join_table, #join_using_clause_sql, #last, #limit, #literal, #lock_style, #map, #max, #min, #multi_insert, #multi_insert_sql, #naked, #negative_boolean_constant_sql, #or, #order, #order_append, #order_by, #order_more, #order_prepend, #ordered_expression_sql, #paginate, #placeholder_literal_string_sql, #prepare, #print, #provides_accurate_rows_matched?, #qualified_identifier_sql, #qualify, #qualify_to, #qualify_to_first_source, #query, #quote_identifier, #quote_identifiers?, #quote_schema_table, #quoted_identifier, #range, #recursive_cte_requires_column_aliases?, #requires_placeholder_type_specifiers?, #requires_sql_standard_datetimes?, #returning, #reverse, #reverse_order, #row_number_column, #schema_and_table, #select, #select_all, #select_append, #select_group, #select_hash, #select_map, #select_more, #select_order_map, #select_sql, #server, #set, #set_defaults, #set_graph_aliases, #set_overrides, #single_record, #single_value, #split_alias, #sql, #subscript_sql, #sum, #supports_cte?, #supports_cte_in_subqueries?, #supports_distinct_on?, #supports_insert_select?, #supports_intersect_except?, #supports_intersect_except_all?, #supports_is_true?, #supports_join_using?, #supports_modifying_joins?, #supports_multiple_column_in?, #supports_ordered_distinct_on?, #supports_returning?, #supports_select_all_and_column?, #supports_timestamp_timezones?, #supports_timestamp_usecs?, #supports_where_true?, #supports_window_functions?, #to_csv, #to_dot, #to_hash, #truncate, #truncate_sql, #unbind, #unfiltered, #ungraphed, #ungrouped, #union, #unlimited, #unordered, #unused_table_alias, #update_sql, #where, #window_function_sql, #window_sql, #with, #with_recursive, #with_sql

Methods included from Sequel::Metaprogramming

#meta_def

Methods included from SQL::StringMethods

#ilike, #like

Methods included from SQL::OrderMethods

#asc, #desc

Methods included from SQL::NumericMethods

#+

Methods included from SQL::ComplexExpressionMethods

#extract, #sql_boolean, #sql_number, #sql_string

Methods included from SQL::CastMethods

#cast, #cast_numeric, #cast_string

Methods included from SQL::BooleanMethods

#~

Methods included from SQL::AliasMethods

#as

Constructor Details

This class inherits a constructor from Sequel::Dataset

Instance Method Details

#delete ⇒ Object

Delete rows matching this dataset



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# File 'lib/sequel/adapters/mysql.rb', line 270

def delete
  execute_dui(delete_sql){|c| return c.affected_rows}
end

#fetch_rows(sql, &block) ⇒ Object

Yield all rows matching this dataset. If the dataset is set to split multiple statements, yield arrays of hashes one per statement instead of yielding results for all statements as hashes.



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# File 'lib/sequel/adapters/mysql.rb', line 277

def fetch_rows(sql, &block)
  execute(sql) do |r|
    i = -1
    cps = db.conversion_procs
    cols = r.fetch_fields.map do |f| 
      # Pretend tinyint is another integer type if its length is not 1, to
      # avoid casting to boolean if Sequel::MySQL.convert_tinyint_to_bool
      # is set.
      type_proc = f.type == 1 && f.length != 1 ? cps[2] : cps[f.type]
      [output_identifier(f.name), type_proc, i+=1]
    end
    @columns = cols.map{|c| c.first}
    if opts[:split_multiple_result_sets]
      s = []
      yield_rows(r, cols){|h| s << h}
      yield s
    else
      yield_rows(r, cols, &block)
    end
  end
  self
end

#graph ⇒ Object

Don’t allow graphing a dataset that splits multiple statements

Raises:



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# File 'lib/sequel/adapters/mysql.rb', line 301

def graph(*)
  raise(Error, "Can't graph a dataset that splits multiple result sets") if opts[:split_multiple_result_sets]
  super
end

#insert(*values) ⇒ Object

Insert a new value into this dataset



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# File 'lib/sequel/adapters/mysql.rb', line 307

def insert(*values)
  execute_dui(insert_sql(*values)){|c| return c.insert_id}
end

#replace(*args) ⇒ Object

Replace (update or insert) the matching row.



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# File 'lib/sequel/adapters/mysql.rb', line 312

def replace(*args)
  execute_dui(replace_sql(*args)){|c| return c.insert_id}
end

#split_multiple_result_sets ⇒ Object

Makes each yield arrays of rows, with each array containing the rows for a given result set. Does not work with graphing. So you can submit SQL with multiple statements and easily determine which statement returned which results.

Modifies the row_proc of the returned dataset so that it still works as expected (running on the hashes instead of on the arrays of hashes). If you modify the row_proc afterward, note that it will receive an array of hashes instead of a hash.

Raises:



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# File 'lib/sequel/adapters/mysql.rb', line 325

def split_multiple_result_sets
  raise(Error, "Can't split multiple statements on a graphed dataset") if opts[:graph]
  ds = clone(:split_multiple_result_sets=>true)
  ds.row_proc = proc{|x| x.map{|h| row_proc.call(h)}} if row_proc
  ds
end

#update(values = {}) ⇒ Object

Update the matching rows.



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# File 'lib/sequel/adapters/mysql.rb', line 333

def update(values={})
  execute_dui(update_sql(values)){|c| return c.affected_rows}
end