有没有办法写一个像findAll这样的delete / deleteAll查询?
例如,我想做这样的事情(假设MyModel是Sequelize模型......):
MyModel.deleteAll({ where: ['some_field != ?', something] })
.on('success', function() { /* ... */ });
对于使用Sequelize版本3及更高版本的任何人,请使用:
Model.destroy({
where: {
// criteria
}
})
我深入研究了代码,一步一步地进入以下文件:
https://github.com/sdepold/sequelize/blob/master/test/Model/destroy.js
https://github.com/sdepold/sequelize/blob/master/lib/model.js#L140
https://github.com/sdepold/sequelize/blob/master/lib/query-interface.js#L207-217
https://github.com/sdepold/sequelize/blob/master/lib/connectors/mysql/query-generator.js
我找到了什么:
没有deleteAll方法,你可以在记录上调用destroy()方法,例如:
Project.find(123).on('success', function(project) {
project.destroy().on('success', function(u) {
if (u && u.deletedAt) {
// successfully deleted the project
}
})
})
不知道问题是否仍然相关,但我在Sequelize的文档中找到了以下内容。
User.destroy('`name` LIKE "J%"').success(function() {
// We just deleted all rows that have a name starting with "J"
})
http://sequelizejs.com/blog/state-of-v1-7-0
希望能帮助到你!
此示例显示如何承诺而不是回调。
Model.destroy({
where: {
id: 123 //this will be your id that you want to delete
}
}).then(function(rowDeleted){ // rowDeleted will return number of rows deleted
if(rowDeleted === 1){
console.log('Deleted successfully');
}
}, function(err){
console.log(err);
});
查看此链接了解更多信息http://docs.sequelizejs.com/en/latest/api/model/#destroyoptions-promiseinteger
在新版本中,您可以尝试这样的方法
function (req,res) {
model.destroy({
where: {
id: req.params.id
}
})
.then(function (deletedRecord) {
if(deletedRecord === 1){
res.status(200).json({message:"Deleted successfully"});
}
else
{
res.status(404).json({message:"record not found"})
}
})
.catch(function (error){
res.status(500).json(error);
});
我曾经为Sails写过类似的东西,以防它节省你一些时间:
用法示例:
// Delete the user with id=4
User.findAndDelete(4,function(error,result){
// all done
});
// Delete all users with type === 'suspended'
User.findAndDelete({
type: 'suspended'
},function(error,result){
// all done
});
资源:
/**
* Retrieve models which match `where`, then delete them
*/
function findAndDelete (where,callback) {
// Handle *where* argument which is specified as an integer
if (_.isFinite(+where)) {
where = {
id: where
};
}
Model.findAll({
where:where
}).success(function(collection) {
if (collection) {
if (_.isArray(collection)) {
Model.deleteAll(collection, callback);
}
else {
collection.destroy().
success(_.unprefix(callback)).
error(callback);
}
}
else {
callback(null,collection);
}
}).error(callback);
}
/**
* Delete all `models` using the query chainer
*/
deleteAll: function (models) {
var chainer = new Sequelize.Utils.QueryChainer();
_.each(models,function(m,index) {
chainer.add(m.destroy());
});
return chainer.run();
}
来自:orm.js。
希望有所帮助!
这是使用Await / Async示例的ES6:
async deleteProduct(id) {
if (!id) {
return {msg: 'No Id specified..', payload: 1};
}
try {
return !!await products.destroy({
where: {
id: id
}
});
} catch (e) {
return false;
}
}
请注意,我在await的结果上使用!!
Bang Bang运算符,它会将结果更改为布尔值。