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# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
module SchemaStatements # :nodoc:
# Returns an array of indexes for the given table.
def indexes(table_name)
indexes = []
current_index = nil
execute_and_free("SHOW KEYS FROM #{quote_table_name(table_name)}", "SCHEMA") do |result|
each_hash(result) do |row|
if current_index != row[:Key_name]
next if row[:Key_name] == "PRIMARY" # skip the primary key
current_index = row[:Key_name]
mysql_index_type = row[:Index_type].downcase.to_sym
case mysql_index_type
when :fulltext, :spatial
index_type = mysql_index_type
when :btree, :hash
index_using = mysql_index_type
end
indexes << [
row[:Table],
row[:Key_name],
row[:Non_unique].to_i == 0,
[],
lengths: {},
orders: {},
type: index_type,
using: index_using,
comment: row[:Index_comment].presence
]
end
if row[:Expression]
expression = row[:Expression]
expression = +"(#{expression})" unless expression.start_with?("(")
indexes.last[-2] << expression
indexes.last[-1][:expressions] ||= {}
indexes.last[-1][:expressions][expression] = expression
indexes.last[-1][:orders][expression] = :desc if row[:Collation] == "D"
else
indexes.last[-2] << row[:Column_name]
indexes.last[-1][:lengths][row[:Column_name]] = row[:Sub_part].to_i if row[:Sub_part]
indexes.last[-1][:orders][row[:Column_name]] = :desc if row[:Collation] == "D"
end
end
end
indexes.map do |index|
options = index.last
if expressions = options.delete(:expressions)
orders = options.delete(:orders)
lengths = options.delete(:lengths)
columns = index[-2].map { |name|
[ name.to_sym, expressions[name] || +quote_column_name(name) ]
}.to_h
index[-2] = add_options_for_index_columns(
columns, order: orders, length: lengths
).values.join(", ")
end
IndexDefinition.new(*index)
end
end
def remove_column(table_name, column_name, type = nil, options = {})
if foreign_key_exists?(table_name, column: column_name)
remove_foreign_key(table_name, column: column_name)
end
super
end
def create_table(table_name, options: default_row_format, **)
super
end
def internal_string_options_for_primary_key
super.tap do |options|
if !row_format_dynamic_by_default? && CHARSETS_OF_4BYTES_MAXLEN.include?(charset)
options[:collation] = collation.sub(/\A[^_]+/, "utf8")
end
end
end
def update_table_definition(table_name, base)
MySQL::Table.new(table_name, base)
end
def create_schema_dumper(options)
MySQL::SchemaDumper.create(self, options)
end
private
CHARSETS_OF_4BYTES_MAXLEN = ["utf8mb4", "utf16", "utf16le", "utf32"]
def row_format_dynamic_by_default?
if mariadb?
version >= "10.2.2"
else
version >= "5.7.9"
end
end
def default_row_format
return if row_format_dynamic_by_default?
unless defined?(@default_row_format)
if query_value("SELECT @@innodb_file_per_table = 1 AND @@innodb_file_format = 'Barracuda'") == 1
@default_row_format = "ROW_FORMAT=DYNAMIC"
else
@default_row_format = nil
end
end
@default_row_format
end
def schema_creation
MySQL::SchemaCreation.new(self)
end
def create_table_definition(*args)
MySQL::TableDefinition.new(*args)
end
def new_column_from_field(table_name, field)
type_metadata = fetch_type_metadata(field[:Type], field[:Extra])
default, default_function = field[:Default], nil
if type_metadata.type == :datetime && /\ACURRENT_TIMESTAMP(?:\([0-6]?\))?\z/i.match?(default)
default, default_function = nil, default
elsif type_metadata.extra == "DEFAULT_GENERATED"
default = +"(#{default})" unless default.start_with?("(")
default, default_function = nil, default
end
MySQL::Column.new(
field[:Field],
default,
type_metadata,
field[:Null] == "YES",
table_name,
default_function,
field[:Collation],
comment: field[:Comment].presence
)
end
def fetch_type_metadata(sql_type, extra = "")
MySQL::TypeMetadata.new(super(sql_type), extra: extra)
end
def extract_foreign_key_action(specifier)
super unless specifier == "RESTRICT"
end
def add_index_length(quoted_columns, **options)
lengths = options_for_index_columns(options[:length])
quoted_columns.each do |name, column|
column << "(#{lengths[name]})" if lengths[name].present?
end
end
def add_options_for_index_columns(quoted_columns, **options)
quoted_columns = add_index_length(quoted_columns, options)
super
end
def data_source_sql(name = nil, type: nil)
scope = quoted_scope(name, type: type)
sql = +"SELECT table_name FROM information_schema.tables"
sql << " WHERE table_schema = #{scope[:schema]}"
sql << " AND table_name = #{scope[:name]}" if scope[:name]
sql << " AND table_type = #{scope[:type]}" if scope[:type]
sql
end
def quoted_scope(name = nil, type: nil)
schema, name = extract_schema_qualified_name(name)
scope = {}
scope[:schema] = schema ? quote(schema) : "database()"
scope[:name] = quote(name) if name
scope[:type] = quote(type) if type
scope
end
def extract_schema_qualified_name(string)
schema, name = string.to_s.scan(/[^`.\s]+|`[^`]*`/)
schema, name = nil, schema unless name
[schema, name]
end
end
end
end
end
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