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# File 'lib/uuid_v7/patches/mysql/fx_migration.rb', line 7
def populate_uuid_field(table_name:, column_name:)
table_name = table_name.to_s.to_sym
column_name = column_name.to_s.to_sym
raise ArgumentError, "Column #{column_name} does not exist on table #{table_name}" unless column_exists?(table_name, column_name)
connection.execute " DROP FUNCTION IF EXISTS uuid_v7;\n SQL\n\n connection.exec_query <<~SQL.squish\n CREATE FUNCTION uuid_v7 (time_of_creation DATETIME)\n RETURNS BINARY(16)\n LANGUAGE SQL\n NOT DETERMINISTIC\n NO SQL\n SQL SECURITY DEFINER\n BEGIN\n DECLARE uuid CHAR(36);\n DECLARE undashed_uuid CHAR(32);\n DECLARE currentTime BIGINT;\n DECLARE buuid BINARY(16);\n\n SET currentTime = UNIX_TIMESTAMP(time_of_creation) * 1000 + FLOOR(MICROSECOND(NOW(6)) / 1000);\n\n SET uuid = LOWER(\n CONCAT(\n LPAD(HEX(currentTime), 12, '0'), '-7',\n LPAD(HEX(FLOOR(RAND() * 0x1000)), 3, '0'), '-',\n HEX(0x8000 | FLOOR(RAND() * 0x4000)), '-',\n LPAD(HEX(FLOOR(RAND() * 0x1000000000000)), 12, '0')\n )\n );\n\n SET undashed_uuid = REPLACE(uuid, '-', '');\n SET buuid = UNHEX(undashed_uuid);\n\n RETURN buuid;\n END\n SQL\n\n # Check for NULL created_at values\n result = connection.exec_query(<<~SQL)\n SELECT COUNT(*) AS count FROM \#{table_name} WHERE created_at IS NULL;\n SQL\n\n raise ActiveRecord::RecordInvalid, \"There are records with NULL created_at in \#{table_name}\" if (result.rows[0][0]).positive?\n\n connection.execute <<~SQL\n UPDATE \#{table_name} SET \#{column_name} = uuid_v7(created_at) WHERE \#{column_name} IS NULL;\n SQL\n\n connection.execute <<~SQL\n DROP FUNCTION IF EXISTS uuid_v7;\n SQL\nend\n"
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