如何更正错误 DatabaseException (near ")": 语法错误答案

【问题标题】：How to correct error DatabaseException (near ")": syntax error如何更正错误 DatabaseException (near ")": 语法错误
【发布时间】：2021-08-22 21:41:20
【问题描述】：

error DatabaseException(near ")": 语法错误 (code 1 SQLITE_ERROR): , 编译时: CREATE TABLE my_table ( 我/颤振（21754）：_id 整数主键， I/flutter (21754)：名称 TEXT NOT NULL， I/flutter (21754)：地址 TEXT NOT NULL， I/flutter (21754): cmets TEXT NOT NULL, I/flutter (21754): sigURL TEXT NOT NULL, I/flutter (21754): selfpicURL TEXT NOT NULL, 我/颤振（21754）：我/颤振（21754）：嗨，INT NOT NULL， I/flutter (21754): time TEXT NOT NULL,

import 'dart:io';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';
import 'package:path_provider/path_provider.dart';

class DatabaseHelper {

static final _databaseName = "MyDatabase.db";
static final _databaseVersion = 1;

static final table = 'my_table';

static final columnId = '_id';
static final columnName = 'name';
static final address = 'address';

static final comments = 'comments';
static final sigURL = 'sigURL';

static final columnAge = 'hi';

static final  selfpicURL = 'selfpicURL';

static final  createdTime = 'time';

DatabaseHelper._privateConstructor();
static final DatabaseHelper instance = DatabaseHelper._privateConstructor();

static Database? _database;
Future<Database> get database async {
if (_database != null) return _database!;
// lazily instantiate the db the first time it is accessed
_database = await _initDatabase();
return _database!;
}

_initDatabase() async {
Directory documentsDirectory = await getApplicationDocumentsDirectory();
String path = join(documentsDirectory.path, _databaseName);
return await openDatabase(path,
version: _databaseVersion,
onCreate: _onCreate);
}

Future _onCreate(Database db, int version) async {
await db.execute('''
          CREATE TABLE $table (
            $columnId INTEGER PRIMARY KEY,
            $columnName TEXT NOT NULL,
            $address TEXT NOT NULL,
           $comments TEXT NOT NULL,
            $sigURL TEXT NOT NULL,
           $selfpicURL TEXT NOT NULL,

           $columnAge INT NOT NULL,
            $createdTime TEXT NOT NULL,

                        
                        
            
          )
          ''');
}


Future<int> insert(Map<String, dynamic> row) async {
Database db = await instance.database;
return await db.insert(table, row);
}


Future<List<Map<String, dynamic>>> queryAllRows() async {
Database db = await instance.database;
return await db.query(table);
}


Future queryRowCount() async {
Database db = await instance.database;
return Sqflite.firstIntValue(await db.rawQuery('SELECT COUNT(*) FROM $table'));
}


Future<int> update(Map<String, dynamic> row) async {
Database db = await instance.database;
int id = row[columnId];
return await db.update(table, row, where: '$columnId = ?', whereArgs: [id]);
}


Future<int> delete(int id) async {
Database db = await instance.database;
return await db.delete(table, where: '$columnId = ?', whereArgs: [id]);
}
}

【问题讨论】：

标签： flutter flutter-dependencies sqflite

【解决方案1】：

SQLite SQL 解析器不支持尾括号前的尾随逗号

而不是（在您的陈述结束时）

  ...
  $createdTime TEXT NOT NULL,
)

做

  ...
  $createdTime TEXT NOT NULL
)

【讨论】：

【解决方案2】：

create table $tableTodo ( 
  $columnId integer primary key autoincrement, 
  $columnTitle text not null,
  $columnDone integer not null)
''');

如果您仔细查看最后一行 $columnDone integer not null，它没有像其他 2 行一样的逗号，这就是您的代码中的问题。

for more info

愉快的编码

【讨论】：