在 flutter 中使用 sqflite 编辑数据的问题

Question

What is wrong in this code? In debug console shown write sql code, but for some reason it doesn't work

  Future<void> _toggleTodoItem(TodoItem todo) async {
    final int count = await this._db.rawUpdate(
        /*sql=*/ '''
      UPDATE $kDbTableName
      SET content = ${todo.content},
      SET number = ${todo.number}
      WHERE id = ${todo.id};''');
    print('Updated $count records in db.');
  }

There is an error

E/SQLiteLog( 7167): (1) near "SET": syntax error in "UPDATE example1_tbl
E/SQLiteLog( 7167):       SET content = n,
E/SQLiteLog( 7167):       SET number = 1
E/SQLiteLog( 7167):       WHERE id = 7;"
E/flutter ( 7167): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: DatabaseException(near "SET": syntax error (code 1 SQLITE_ERROR): , while compiling: UPDATE example1_tbl
E/flutter ( 7167):       SET content = n,
E/flutter ( 7167):       SET number = 1
E/flutter ( 7167):       WHERE id = 7;) sql '      UPDATE example1_tbl
E/flutter ( 7167):       SET content = n,
E/flutter ( 7167):       SET number = 1
E/flutter ( 7167):       WHERE id = 7;' args []}

Answer 1

"UPDATE" syntax doesn't look like that ( https://sqlite.org/lang_update.html ). You want:

UPDATE example1_tbl SET content = 'n', number = 1 WHERE id = 7

And you should also be using parameters ( https://github.com/tekartik/sqflite/blob/master/sqflite/doc/sql.md#parameters ). Don't use text inserted into.rawUpdate unless you want to be subject to Bobby Tables attacks ( https://bobby-tables.com ).