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module ActiveRecord
module ConnectionAdapters
module MySQL
class SchemaCreation < AbstractAdapter::SchemaCreation # :nodoc:
delegate :add_sql_comment!, :mariadb?, to: :@conn
private :add_sql_comment!, :mariadb?
private
def visit_DropForeignKey(name)
"DROP FOREIGN KEY #{name}"
end
def visit_AddColumnDefinition(o)
add_column_position!(super, column_options(o.column))
end
def visit_ChangeColumnDefinition(o)
change_column_sql = "CHANGE #{quote_column_name(o.name)} #{accept(o.column)}".dup
add_column_position!(change_column_sql, column_options(o.column))
end
def add_table_options!(create_sql, options)
add_sql_comment!(super, options[:comment])
end
def add_column_options!(sql, options)
# By default, TIMESTAMP columns are NOT NULL, cannot contain NULL values,
# and assigning NULL assigns the current timestamp. To permit a TIMESTAMP
# column to contain NULL, explicitly declare it with the NULL attribute.
# See http://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html
if /\Atimestamp\b/.match?(options[:column].sql_type) && !options[:primary_key]
sql << " NULL" unless options[:null] == false || options_include_default?(options)
end
if charset = options[:charset]
sql << " CHARACTER SET #{charset}"
end
if collation = options[:collation]
sql << " COLLATE #{collation}"
end
if as = options[:as]
sql << " AS (#{as})"
if options[:stored]
sql << (mariadb? ? " PERSISTENT" : " STORED")
end
end
add_sql_comment!(super, options[:comment])
end
def add_column_position!(sql, options)
if options[:first]
sql << " FIRST"
elsif options[:after]
sql << " AFTER #{quote_column_name(options[:after])}"
end
sql
end
def index_in_create(table_name, column_name, options)
index_name, index_type, index_columns, _, _, index_using, comment = @conn.add_index_options(table_name, column_name, options)
add_sql_comment!("#{index_type} INDEX #{quote_column_name(index_name)} #{index_using} (#{index_columns})".dup, comment)
end
end
end
end
end
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