[英]Unable to select data from DB via Sequelize in Node.js
为什么以下代码给我一个错误?
var Sequelize = require('sequelize');
var sequelize = new Sequelize('schema', 'root', '');
var Foo = sequelize.define('Foo', {
name: Sequelize.STRING
});
sequelize.sync().then(function() {
Foo.create({
name: 'some name'
}).then(function() {
Foo.findAll({ where: { name: { $like: '%s%' } } }).then(function(result) {
console.log(result.rows.length);
});
});
});
输出量
Executing (default): SELECT `id`, `name`, `createdAt`, `updatedAt` FROM `Foos` AS `Foo` WHERE `Foo`.`name` LIKE '%s%';
Unhandled rejection TypeError: Cannot read property 'length' of undefined
at null.<anonymous> (E:\work\projects\src\preorders\server.js:13:30)
at tryCatcher (E:\work\projects\src\preorders\node_modules\sequelize\node_modules\bluebird\js\main\util.js:26:23)
at Promise._settlePromiseFromHandler (E:\work\projects\src\preorders\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:507:31)
at Promise._settlePromiseAt (E:\work\projects\src\preorders\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:581:18)
at Promise._settlePromises (E:\work\projects\src\preorders\node_modules\sequelize\node_modules\bluebird\js\main\promise.js:697:14)
at Async._drainQueue (E:\work\projects\src\preorders\node_modules\sequelize\node_modules\bluebird\js\main\async.js:123:16)
at Async._drainQueues (E:\work\projects\src\preorders\node_modules\sequelize\node_modules\bluebird\js\main\async.js:133:10)
at Async.drainQueues (E:\work\projects\src\preorders\node_modules\sequelize\node_modules\bluebird\js\main\async.js:15:14)
at process._tickCallback (node.js:419:13)
这是我的package.json
文件中的“ dependencies”选项:
"dependencies": {
"mysql": "^2.9.0",
"sequelize": "^3.13.0"
}
回调中的变量result
应该已经是结果数组,而不是一些保存行的对象。 将其更改为此将获得行数:
Foo.findAll({ where: { name: { $like: '%s%' } } }).then(function(result) {
console.log(result.length);
});
转储所有数据以查看它是否确实是您想要的数据。
您的result
没有rows
属性。
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