Class: ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 139

class_attribute :emulate_booleans

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 139

class_attribute :emulate_booleans

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 682

def strict_mode?
  self.class.type_cast_config_to_boolean(@config.fetch(:strict, true))
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 221

def supports_datetime_with_precision?
  version >= '5.6.4'
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 213

def supports_foreign_keys?
  true
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 197

def supports_index_sort_order?
  true
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 209

def supports_indexes_in_create?
  true
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 183

def supports_migrations?
  true
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 187

def supports_primary_key?
  true
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 205

def supports_transaction_isolation?
  version >= '5.0.0'
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 217

def supports_views?
  version >= '5.0.0'
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 336

def begin_isolated_db_transaction(isolation)
  execute "SET TRANSACTION ISOLATION LEVEL #{transaction_isolation_levels.fetch(isolation)}"
  begin_db_transaction
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 659

def case_insensitive_comparison(table, attribute, column, value)
  if column.case_sensitive?
    super
  else
    table[attribute].eq(value)
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 651

def case_sensitive_comparison(table, attribute, column, value)
  if column.case_sensitive?
    table[attribute].eq(value)
  else
    super
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 646

def case_sensitive_modifier(node, table_attribute)
  node = Arel::Nodes.build_quoted node, table_attribute
  Arel::Nodes::Bin.new(node)
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 528

def change_column_null(table_name, column_name, null, default = nil)
  column = column_for(table_name, column_name)

  unless null || default.nil?
    execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
  end

  change_column table_name, column_name, column.sql_type, :null => null
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 404

def charset
  show_variable 'character_set_database'
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 310

def clear_cache!
  super
  reload_type_map
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 409

def collation
  show_variable 'collation_database'
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 383

def create_database(name, options = {})
  if options[:collation]
    execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}` COLLATE `#{options[:collation]}`"
  else
    execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}`"
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 399

def current_database
  select_value 'SELECT DATABASE() as db'
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 442

alias data_source_exists? table_exists?

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 422

alias data_sources tables

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 509

def drop_table(table_name, options = {})
  execute "DROP#{' TEMPORARY' if options[:temporary]} TABLE #{quote_table_name(table_name)}#{' CASCADE' if options[:force] == :cascade}"
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 361

def empty_insert_statement_value
  "VALUES ()"
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 316

def execute(sql, name = nil)
  log(sql, name) { @connection.query(sql) }
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 552

def foreign_keys(table_name)
  fk_info = select_all <<-SQL.strip_heredoc
    SELECT fk.referenced_table_name as 'to_table'
          ,fk.referenced_column_name as 'primary_key'
          ,fk.column_name as 'column'
          ,fk.constraint_name as 'name'
    FROM information_schema.key_column_usage fk
    WHERE fk.referenced_column_name is not null
      AND fk.table_schema = '#{@config[:database]}'
      AND fk.table_name = '#{table_name}'
  SQL

  create_table_info = select_one("SHOW CREATE TABLE #{quote_table_name(table_name)}")["Create Table"]

  fk_info.map do |row|
    options = {
      column: row['column'],
      name: row['name'],
      primary_key: row['primary_key']
    }

    options[:on_update] = extract_foreign_key_action(create_table_info, row['name'], "UPDATE")
    options[:on_delete] = extract_foreign_key_action(create_table_info, row['name'], "DELETE")

    ForeignKeyDefinition.new(table_name, row['to_table'], options)
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 229

def index_algorithms
  { default: 'ALGORITHM = DEFAULT', copy: 'ALGORITHM = COPY', inplace: 'ALGORITHM = INPLACE' }
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 225

def native_database_types
  NATIVE_DATABASE_TYPES
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 628

def pk_and_sequence_for(table)
  execute_and_free("SHOW CREATE TABLE #{quote_table_name(table)}", 'SCHEMA') do |result|
    create_table = each_hash(result).first[:"Create Table"]
    if create_table.to_s =~ /PRIMARY KEY\s(?:USING\s\w\s)?\((.+)\)/
      keys = $1.split(",").map { |key| key.delete('`"') }
      keys.length == 1 ? [keys.first, nil] : nil
    else
      nil
    end
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 641

def primary_key(table)
  pk_and_sequence = pk_and_sequence_for(table)
  pk_and_sequence && pk_and_sequence.first
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 285

def quoted_date(value)
  if supports_datetime_with_precision? && value.acts_like?(:time) && value.respond_to?(:usec)
    "#{super}.#{sprintf("%06d", value.usec)}"
  else
    super
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 277

def quoted_false
  QUOTED_FALSE
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 269

def quoted_true
  QUOTED_TRUE
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 369

def recreate_database(name, options = {})
  drop_database(name)
  sql = create_database(name, options)
  reconnect!
  sql
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 513

def rename_index(table_name, old_name, new_name)
  if supports_rename_index?
    validate_index_length!(table_name, new_name)

    execute "ALTER TABLE #{quote_table_name(table_name)} RENAME INDEX #{quote_table_name(old_name)} TO #{quote_table_name(new_name)}"
  else
    super
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 504

def rename_table(table_name, new_name)
  execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
  rename_table_indexes(table_name, new_name)
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 57

def schema_creation
  SchemaCreation.new self
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 620

def show_variable(name)
  variables = select_all("select @@#{name} as 'Value'", 'SCHEMA')
  variables.first['Value'] unless variables.empty?
rescue ActiveRecord::StatementInvalid
  nil
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 428

def table_exists?(name)
  return false unless name.present?
  return true if tables(nil, nil, name).any?

  name          = name.to_s
  schema, table = name.split('.', 2)

  unless table # A table was provided without a schema
    table  = schema
    schema = nil
  end

  tables(nil, schema, table).any?
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 424

def truncate(table_name, name = nil)
  execute "TRUNCATE TABLE #{quote_table_name(table_name)}", name
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 581

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  case type.to_s
  when 'binary'
    case limit
    when 0..0xfff;           "varbinary(#{limit})"
    when nil;                "blob"
    when 0x1000..0xffffffff; "blob(#{limit})"
    else raise(ActiveRecordError, "No binary type has character length #{limit}")
    end
  when 'integer'
    case limit
    when 1; 'tinyint'
    when 2; 'smallint'
    when 3; 'mediumint'
    when nil, 4, 11; 'int(11)'  # compatibility with MySQL default
    when 5..8; 'bigint'
    else raise(ActiveRecordError, "No integer type has byte size #{limit}")
    end
  when 'text'
    case limit
    when 0..0xff;               'tinytext'
    when nil, 0x100..0xffff;    'text'
    when 0x10000..0xffffff;     'mediumtext'
    when 0x1000000..0xffffffff; 'longtext'
    else raise(ActiveRecordError, "No text type has character length #{limit}")
    end
  when 'datetime'
    return super unless precision

    case precision
      when 0..6; "datetime(#{precision})"
      else raise(ActiveRecordError, "No datetime type has precision of #{precision}. The allowed range of precision is from 0 to 6.")
    end
  else
    super
  end
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 281

def unquoted_false
  0
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 273

def unquoted_true
  1
end

# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 686

def valid_type?(type)
  !native_database_types[type].nil?
end