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

Included in:
ActiveRecord::ConnectionAdapters::Mysql2Adapter
Defined in:
lib/active_record/connection_adapters/mysql/database_statements.rb

Instance Method Summary collapse

Instance Method Details

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



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# File '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) ⇒ Object 



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# File '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

#execute(sql, name = nil) ⇒ Object

Executes the SQL statement in the context of this connection.



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# File '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 = []) ⇒ Object 



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# File '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

#query(sql, name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/mysql/database_statements.rb', line 18

def query(sql, name = nil) # :nodoc:
  execute(sql, name).to_a
end

#select_all ⇒ Object

Returns an ActiveRecord::Result instance.



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# File 'lib/active_record/connection_adapters/mysql/database_statements.rb', line 8

def select_all(*, **) # :nodoc:
  result = if ExplainRegistry.collect? && prepared_statements
    unprepared_statement { super }
  else
    super
  end
  @connection.abandon_results!
  result
end

#write_query?(sql) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/mysql/database_statements.rb', line 27

def write_query?(sql) # :nodoc:
  !READ_QUERY.match?(sql)
rescue ArgumentError # Invalid encoding
  !READ_QUERY.match?(sql.b)
end