Module: ActiveRecord::ConnectionAdapters::MySQL::DatabaseStatements

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In: `::ActiveRecord::ConnectionAdapters::Mysql2Adapter`
Defined in:	activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb

Instance Method Summary

#exec_delete(sql, name = nil, binds = []) (also: #exec_update)
#exec_query(sql, name = "SQL", binds = [], prepare: false)
#exec_update(sql, name = nil, binds = [])

Alias for #exec_delete.
#execute(sql, name = nil)

Executes the SQL statement in the context of this connection.
#explain(arel, binds = [])

Instance Method Details

#exec_delete(sql, name = nil, binds = []) Also known as: #exec_update

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 75


def exec_delete(sql, name = nil, binds = [])
  if without_prepared_statement?(binds)
    @lock.synchronize do
      execute_and_free(sql, name) { @connection.affected_rows }
    end
  else
    exec_stmt_and_free(sql, name, binds) { |stmt| stmt.affected_rows }
  end
end

#exec_query(sql, name = "SQL", binds = [], prepare: false)

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 55


def exec_query(sql, name = "SQL", binds = [], prepare: false)
  if without_prepared_statement?(binds)
    execute_and_free(sql, name) do |result|
      if result
        build_result(columns: result.fields, rows: result.to_a)
      else
        build_result(columns: [], rows: [])
      end
    end
  else
    exec_stmt_and_free(sql, name, binds, cache_stmt: prepare) do |_, result|
      if result
        build_result(columns: result.fields, rows: result.to_a)
      else
        build_result(columns: [], rows: [])
      end
    end
  end
end

#exec_update(sql, name = nil, binds = [])

Alias for #exec_delete.

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 84


alias :exec_update :exec_delete

#execute(sql, name = nil)

Executes the SQL statement in the context of this connection.

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 43


def execute(sql, name = nil)
  if preventing_writes? && write_query?(sql)
    raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
  end

  # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
  # made since we established the connection
  @connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone

  super
end

#explain(arel, binds = [])

[ GitHub ]

# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 33


def explain(arel, binds = [])
  sql     = "EXPLAIN #{to_sql(arel, binds)}"
  start   = Concurrent.monotonic_time
  result  = exec_query(sql, "EXPLAIN", binds)
  elapsed = Concurrent.monotonic_time - start

  MySQL::ExplainPrettyPrinter.new.pp(result, elapsed)
end