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# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
module DatabaseStatements
# Returns an ActiveRecord::Result instance.
def select_all(*) # :nodoc:
result = if ExplainRegistry.collect? && prepared_statements
unprepared_statement { super }
else
super
end
@connection.abandon_results!
result
end
def query(sql, name = nil) # :nodoc:
execute(sql, name).to_a
end
READ_QUERY = ActiveRecord::ConnectionAdapters::AbstractAdapter.build_read_query_regexp(:begin, :commit, :explain, :select, :set, :show, :release, :savepoint, :rollback) # :nodoc:
private_constant :READ_QUERY
def write_query?(sql) # :nodoc:
!READ_QUERY.match?(sql)
end
# Executes the SQL statement in the context of this connection.
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
def exec_query(sql, name = "SQL", binds = [], prepare: false)
if without_prepared_statement?(binds)
execute_and_free(sql, name) do |result|
if result
ActiveRecord::Result.new(result.fields, result.to_a)
else
ActiveRecord::Result.new([], [])
end
end
else
exec_stmt_and_free(sql, name, binds, cache_stmt: prepare) do |_, result|
if result
ActiveRecord::Result.new(result.fields, result.to_a)
else
ActiveRecord::Result.new([], [])
end
end
end
end
def exec_delete(sql, name = nil, binds = [])
if without_prepared_statement?(binds)
execute_and_free(sql, name) { @connection.affected_rows }
else
exec_stmt_and_free(sql, name, binds) { |stmt| stmt.affected_rows }
end
end
alias :exec_update :exec_delete
private
def execute_batch(sql, name = nil)
super
@connection.abandon_results!
end
def default_insert_value(column)
super unless column.auto_increment?
end
def last_inserted_id(result)
@connection.last_id
end
def supports_set_server_option?
@connection.respond_to?(:set_server_option)
end
def build_truncate_statements(*table_names)
if table_names.size == 1
super.first
else
super
end
end
def multi_statements_enabled?(flags)
if flags.is_a?(Array)
flags.include?("MULTI_STATEMENTS")
else
(flags & Mysql2::Client::MULTI_STATEMENTS) != 0
end
end
def with_multi_statements
previous_flags = @config[:flags]
unless multi_statements_enabled?(previous_flags)
if supports_set_server_option?
@connection.set_server_option(Mysql2::Client::OPTION_MULTI_STATEMENTS_ON)
else
@config[:flags] = Mysql2::Client::MULTI_STATEMENTS
reconnect!
end
end
yield
ensure
unless multi_statements_enabled?(previous_flags)
if supports_set_server_option?
@connection.set_server_option(Mysql2::Client::OPTION_MULTI_STATEMENTS_OFF)
else
@config[:flags] = previous_flags
reconnect!
end
end
end
def combine_multi_statements(total_sql)
total_sql.each_with_object([]) do |sql, total_sql_chunks|
previous_packet = total_sql_chunks.last
if max_allowed_packet_reached?(sql, previous_packet)
total_sql_chunks << +sql
else
previous_packet << ";\n"
previous_packet << sql
end
end
end
def max_allowed_packet_reached?(current_packet, previous_packet)
if current_packet.bytesize > max_allowed_packet
raise ActiveRecordError,
"Fixtures set is too large #{current_packet.bytesize}. Consider increasing the max_allowed_packet variable."
elsif previous_packet.nil?
true
else
(current_packet.bytesize + previous_packet.bytesize + 2) > max_allowed_packet
end
end
def max_allowed_packet
@max_allowed_packet ||= show_variable("max_allowed_packet")
end
def exec_stmt_and_free(sql, name, binds, cache_stmt: false)
if preventing_writes? && write_query?(sql)
raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
end
materialize_transactions
# 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
type_casted_binds = type_casted_binds(binds)
log(sql, name, binds, type_casted_binds) do
if cache_stmt
stmt = @statements[sql] ||= @connection.prepare(sql)
else
stmt = @connection.prepare(sql)
end
begin
result = ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
stmt.execute(*type_casted_binds)
end
rescue Mysql2::Error => e
if cache_stmt
@statements.delete(sql)
else
stmt.close
end
raise e
end
ret = yield stmt, result
result.free if result
stmt.close unless cache_stmt
ret
end
end
end
end
end
end
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