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使用Sequelize从MySQL获取数据到GraphQL失败

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首先,这是我的MySQL表

+-----------+-------------+------+-----+---------+----------------+
| Field     | Type        | Null | Key | Default | Extra          |
+-----------+-------------+------+-----+---------+----------------+
| MemberID  | int(11)     | NO   | PRI | NULL    | auto_increment |
| FirstName | varchar(50) | NO   |     | NULL    |                |
| LastName  | varchar(50) | NO   |     | NULL    |                |
| CityID    | int(11)     | NO   | MUL | NULL    |                |
+-----------+-------------+------+-----+---------+----------------+

我使用Sequelize创建了从我的Node JS服务器到MySQL的连接,如下所示:

var db = new Sequelize(
  'member','root', null,
  {
    host    : 'localhost',
    port    :  3306,
    dialect : 'mysql'
  }
);

然后我使用Sequelize在我的Node JS服务器上定义了我的MySQL表,如下所示:

var memberlist = db.define('members', {
    MemberID  : Sequelize.INTEGER,
    FirstName : Sequelize.STRING,
    LastName  : Sequelize.STRING
});

然后我创建了一个GraphQL Schema来获取数据以及模式的相应解析器

var schema = buildSchema(`

    type Members {
      MemberID: ID!
      FirstName: String!
      LastName: String!
      CityID: City!
    }

    type City {
      CityID: ID!
      CityName: String!
    }

    type Query {
      allMembers: [Members]!
    }
`);

 var root = {

    allMembers  : function(){
       memberlist.find({}).complete(function (err,data) 
       {}).then(({data}) => data)},

 }

var app = express();
 app.use('/graphql', graphqlHTTP({
    schema: schema,
    rootValue: root,
    graphiql: true
}));

当我尝试在GraphQL上运行查询时,出现以下错误:

Executing (default): SELECT `id`, `MemberID`, `FirstName`, `LastName`, 
`createdAt`, `updatedAt` FROM `members` AS `members` LIMIT 1;

Unhandled rejection SequelizeDatabaseError: Unknown column 'id' in 'field 
list'

id (和 createdAtupdateAt )字段来自哪里,因为我没有在Sequelize上定义它们?

1 回答

  • 0

    我在这里假设如果你没有明确告诉你的模型中的主键是什么,它会认为它是一个名为 id 的字段 .

    请尝试以下方法告诉你的主键是什么;

    const memberlist = db.define('members', {
      MemberID  : {
        type: DataTypes.INTEGER,
        primaryKey: true,
      }
      FirstName : Sequelize.STRING,
      LastName  : Sequelize.STRING
    });
    

    为您自动添加createdAt和updatedAt字段 . 要阻止这种情况的发生

    const memberlist = db.define('members', {
      MemberID  : {
        type: DataTypes.INTEGER,
        primaryKey: true,
      }
      FirstName : Sequelize.STRING,
      LastName  : Sequelize.STRING
    }, {
      timestamps: false
    });
    

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