[英]Sequelize.js query to get total count through relationship
我正在使用sequelize来获得关系中的总数。 我需要通过透视表连接的父表中的customerId
。 普通查询看起来像这样:
SELECT count(p.*) FROM parcels as p
LEFT JOIN orders_parcels as op ON op."parcelId" = p.id
LEFT JOIN orders as o ON op."orderId" = o.id
WHERE o."customerId"=1
这很好用。 但不知道如何获得续集查询。
Parcel.findAndCountAll();
编辑:OrderParcel
var OrderParcel = service.sequelize.define('OrderParcel', {
id: {
type: Sequelize.INTEGER,
primaryKey: true,
autoIncrement: true
}
}, {
tableName: 'orders_parcels',
freezeTableName: true,
paranoid: true
});
module.exports = OrderParcel;
var Order = require('./Order');
OrderParcel.belongsTo(Order, {
as: 'Order',
foreignKey: 'orderId'
});
var Parcel = require('../parcel/Parcel');
OrderParcel.belongsTo(Parcel, {
as: 'Parcel',
foreignKey: 'parcelId'
});
一种方法是使用sequelize.query
:
由于通常有一些用例可以更容易地执行原始/已准备好的SQL查询,因此可以使用函数
sequelize.query
。
var query = "SELECT count(p.*) FROM parcels as p" +
" LEFT JOIN orders_parcels as op ON op."parcelId" = p.id" +
" LEFT JOIN orders as o ON op."orderId" = o.id" +
" WHERE o.customerId=1;";
sequelize.query(query, { type: sequelize.QueryTypes.SELECT}).success(function(count){
console.log(count); // It's show the result of query
res.end();
}).catch(function(error){
res.send('server-error', {error: error});
});
假设您已定义关联,则可以使用Model.findAndCountAll 。 它看起来像这样:
Parcel.findAndCountAll({
include: [{
model: OrderParcel,
required: true,
include: [{
model: Order,
where: {
customerId: idNum
}
}]
}]
}).then(function(result) {
});
我完全同意Evan Siroky的方法,但代码必须简化才能正常工作:
Parcel.findAndCountAll({
include: [{
model: Order,
where: {
customerId: idNum
},
duplicating: false // Add this line for retrieving all objects
}]
}).then(function(result) {
console.log('Rows: ' + result.rows + ' Count: ' + result.count)
});
请记住使用belongsToMany方法连接模型!
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