Class: Sequel::MySQL::Dataset

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

Overview

Dataset class for MySQL datasets accessed via the native driver.

Defined Under Namespace

Modules: CallableStatementMethods, PreparedStatementMethods, StoredProcedureMethods

Constant Summary

Constants included from DatasetMethods

Sequel::MySQL::DatasetMethods::BOOL_FALSE, Sequel::MySQL::DatasetMethods::BOOL_TRUE, Sequel::MySQL::DatasetMethods::CAST_TYPES, Sequel::MySQL::DatasetMethods::COMMA_SEPARATOR, Sequel::MySQL::DatasetMethods::TIMESTAMP_FORMAT

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::MUTATION_METHODS, Dataset::NOTIMPL_MSG, Dataset::NULL, Dataset::N_ARITY_OPERATORS, Dataset::PREPARED_ARG_PLACEHOLDER, Dataset::QUESTION_MARK, Dataset::SELECT_CLAUSE_ORDER, Dataset::STOCK_COUNT_OPTS, Dataset::STOCK_TRANSFORMS, Dataset::TWO_ARITY_OPERATORS, 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 DatasetMethods

#cast_sql, #complex_expression_sql, #delete_sql, #full_text_search, #having, #insert_default_values_sql, #join_table, #join_type_sql, #multi_insert_sql, #quoted_identifier, #replace_sql, #update_sql

Methods inherited from Dataset

#<<, #[], #[]=, #add_graph_aliases, #aliased_expression_sql, #all, #and, #array_sql, #as, #avg, #case_expression_sql, #cast_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_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, #insert_sql, #inspect, #intersect, #interval, #invert, #irregular_function_sql, #join_clause_sql, #join_on_clause_sql, #join_table, #join_using_clause_sql, #last, #limit, #literal, #map, #max, #min, #model_classes, #multi_insert, #multi_insert_sql, #naked, #or, #order, #order_more, #ordered_expression_sql, #paginate, #placeholder_literal_string_sql, #polymorphic_key, #print, #qualified_identifier_sql, #query, #quote_identifier, #quote_identifiers?, #quote_schema_table, #quoted_identifier, #range, #reverse_order, #schema_and_table, #select, #select_all, #select_more, #select_sql, #server, #set, #set_defaults, #set_graph_aliases, #set_model, #set_overrides, #single_record, #single_value, #sql, #subscript_sql, #sum, #symbol_to_column_ref, #table_exists?, #to_csv, #to_hash, #transform, #transform_load, #transform_save, #unfiltered, #union, #uniq, #unordered, #upcase_identifiers=, #upcase_identifiers?, #update_sql, #with_sql

Methods included from Enumerable

#send_each

Constructor Details

This class inherits a constructor from Sequel::Dataset

Instance Method Details

#call(type, bind_arguments = {}, values = nil) ⇒ Object

MySQL is different in that it supports prepared statements but not bound variables outside of prepared statements. The default implementation breaks the use of subselects in prepared statements, so extend the temporary prepared statement that this creates with a module that fixes it.



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# File 'lib/sequel_core/adapters/mysql.rb', line 272

def call(type, bind_arguments={}, values=nil)
  ps = to_prepared_statement(type, values)
  ps.extend(CallableStatementMethods)
  ps.call(bind_arguments)
end

#delete(opts = nil) ⇒ Object

Delete rows matching this dataset



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# File 'lib/sequel_core/adapters/mysql.rb', line 279

def delete(opts = nil)
  execute_dui(delete_sql(opts)){|c| c.affected_rows}
end

#fetch_rows(sql) ⇒ Object

Yield all rows matching this dataset



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# File 'lib/sequel_core/adapters/mysql.rb', line 284

def fetch_rows(sql)
  execute(sql) do |r|
    column_types = []
    @columns = r.fetch_fields.map{|f| column_types << f.type; output_identifier(f.name)}
    while row = r.fetch_row
      h = {}
      @columns.each_with_index {|f, i| h[f] = convert_type(row[i], column_types[i])}
      yield h
    end
  end
  self
end

#insert(*values) ⇒ Object

Insert a new value into this dataset



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# File 'lib/sequel_core/adapters/mysql.rb', line 298

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

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

Store the given type of prepared statement in the associated database with the given name.



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# File 'lib/sequel_core/adapters/mysql.rb', line 304

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

#replace(*args) ⇒ Object

Replace (update or insert) the matching row.



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# File 'lib/sequel_core/adapters/mysql.rb', line 315

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

#update(*args) ⇒ Object

Update the matching rows.



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# File 'lib/sequel_core/adapters/mysql.rb', line 320

def update(*args)
  execute_dui(update_sql(*args)){|c| c.affected_rows}
end