Class: Sequel::MySQL::Dataset

Inherits:
Dataset show all
Includes:
DatasetMethods, StoredProcedures
Defined in:
lib/sequel/lib/sequel/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::COMMA_SEPARATOR, Sequel::MySQL::DatasetMethods::DELETE_CLAUSE_METHODS, Sequel::MySQL::DatasetMethods::INSERT_CLAUSE_METHODS, Sequel::MySQL::DatasetMethods::SELECT_CLAUSE_METHODS, Sequel::MySQL::DatasetMethods::UPDATE_CLAUSE_METHODS

Constants inherited from Dataset

Dataset::AND_SEPARATOR, 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::COUNT_FROM_SELF_OPTS, Dataset::COUNT_OF_ALL_AS_COUNT, Dataset::DATASET_ALIAS_BASE_NAME, Dataset::DELETE_CLAUSE_METHODS, Dataset::FROM_SELF_KEEP_OPTS, Dataset::GET_ERROR_MSG, Dataset::IMPORT_ERROR_MSG, Dataset::INSERT_CLAUSE_METHODS, Dataset::IS_LITERALS, Dataset::IS_OPERATORS, Dataset::MAP_ERROR_MSG, Dataset::MUTATION_METHODS, Dataset::NOTIMPL_MSG, Dataset::NULL, Dataset::N_ARITY_OPERATORS, Dataset::PREPARED_ARG_PLACEHOLDER, Dataset::QUALIFY_KEYS, Dataset::QUESTION_MARK, Dataset::SELECT_CLAUSE_METHODS, Dataset::SQL_WITH, Dataset::STANDARD_TIMESTAMP_FORMAT, Dataset::STOCK_COUNT_OPTS, Dataset::TIMESTAMP_FORMAT, Dataset::TWO_ARITY_OPERATORS, Dataset::UPDATE_CLAUSE_METHODS, Dataset::WILDCARD, Dataset::WITH_SUPPORTED

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

#complex_expression_sql, #full_text_search, #full_text_sql, #having, #insert_ignore, #join_table, #join_type_sql, #multi_insert_sql, #on_duplicate_key_update, #quoted_identifier, #replace_sql, #supports_distinct_on?, #supports_intersect_except?, #supports_timestamp_usecs?

Methods inherited from Dataset

#<<, #[], #[]=, #add_graph_aliases, #aliased_expression_sql, #all, #and, #array_sql, #as, #avg, #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, #empty?, #except, #exclude, #exists, #filter, #first, #first_source_alias, #from, #from_self, #function_sql, #get, #grep, #group, #group_and_count, #having, #import, #initialize, #insert_multiple, #insert_sql, #inspect, #intersect, #interval, #invert, #join_clause_sql, #join_on_clause_sql, #join_table, #join_using_clause_sql, #last, #limit, #literal, #map, #max, #min, #multi_insert, #multi_insert_sql, #naked, #or, #order, #order_more, #ordered_expression_sql, #paginate, #placeholder_literal_string_sql, #print, #qualified_identifier_sql, #qualify, #qualify_to, #qualify_to_first_source, #query, #quote_identifier, #quote_identifiers?, #quote_schema_table, #quoted_identifier, #range, #requires_sql_standard_datetimes?, #reverse_order, #schema_and_table, #select, #select_all, #select_more, #select_sql, #server, #set, #set_defaults, #set_graph_aliases, #set_overrides, #single_record, #single_value, #sql, #subscript_sql, #sum, #supports_cte?, #supports_distinct_on?, #supports_intersect_except?, #supports_intersect_except_all?, #supports_is_true?, #supports_timestamp_timezones?, #supports_timestamp_usecs?, #supports_window_functions?, #to_csv, #to_hash, #truncate, #truncate_sql, #unfiltered, #ungraphed, #ungrouped, #union, #unlimited, #unordered, #update_sql, #where, #window_function_sql, #window_sql, #with, #with_recursive, #with_sql

Methods included from Sequel::Metaprogramming

#meta_def

Methods included from Enumerable

#fourth, #second, #third

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/lib/sequel/adapters/mysql.rb', line 305

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

#deleteObject

Delete rows matching this dataset



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

def delete
  execute_dui(delete_sql){|c| 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/lib/sequel/adapters/mysql.rb', line 319

def fetch_rows(sql, &block)
  execute(sql) do |r|
    i = -1
    cols = r.fetch_fields.map{|f| [output_identifier(f.name), MYSQL_TYPES[f.type], i+=1]}
    @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

#graphObject

Don't allow graphing a dataset that splits multiple statements

Raises:



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# File 'lib/sequel/lib/sequel/adapters/mysql.rb', line 336

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/lib/sequel/adapters/mysql.rb', line 342

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/lib/sequel/adapters/mysql.rb', line 348

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/lib/sequel/adapters/mysql.rb', line 359

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

#split_multiple_result_setsObject

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/lib/sequel/adapters/mysql.rb', line 372

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/lib/sequel/adapters/mysql.rb', line 380

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