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

Included in:
AbstractMysqlAdapter
Defined in:
lib/active_record/connection_adapters/mysql/database_statements.rb

Instance Method Summary collapse

Instance Method Details

#build_explain_clause(options = []) ⇒ Object 



36
37
38
39
40
41
42
43
44
45
46
 
# File 'lib/active_record/connection_adapters/mysql/database_statements.rb', line 36

def build_explain_clause(options = [])
  return "EXPLAIN" if options.empty?

  explain_clause = "EXPLAIN #{options.join(" ").upcase}"

  if analyze_without_explain? && explain_clause.include?("ANALYZE")
    explain_clause.sub("EXPLAIN ", "")
  else
    explain_clause
  end
end

#explain(arel, binds = [], options = []) ⇒ Object 



27
28
29
30
31
32
33
34
 
# File 'lib/active_record/connection_adapters/mysql/database_statements.rb', line 27

def explain(arel, binds = [], options = [])
  sql     = build_explain_clause(options) + " " + to_sql(arel, binds)
  start   = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  result  = internal_exec_query(sql, "EXPLAIN", binds)
  elapsed = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start

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

#high_precision_current_timestamp ⇒ Object 



23
24
25
 
# File 'lib/active_record/connection_adapters/mysql/database_statements.rb', line 23

def high_precision_current_timestamp
  HIGH_PRECISION_CURRENT_TIMESTAMP
end

#write_query?(sql) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


17
18
19
20
21
 
# File 'lib/active_record/connection_adapters/mysql/database_statements.rb', line 17

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