我在我的节点开发中使用dresende / node-orm2 ORM。但是我需要做一些LEFT / RIGHT连接,但我找不到如何在文档中。在尝试进行多个连接时我也遇到了问题。
此代码:
crModel.hasOne ('client', cliModel, {
field: 'client_id'
});
crModel.hasOne ('office', boModel, {
field: 'bo_id'
});
crModel.findByClient ({}).findByOffice ({}).find ({
client_id: 1,
bo_id: 1
}, function () {
console.log (arguments);
});
生成此查询:
SELECT `t1`.`cr_id`, `t1`.`cr_datetime`, `t1`.`credit_id`, `t1`.`gs_id`, `t1`.`cellphone_id`, `t1`.`bo_id`, `t1`.`client_id` FROM `CreditRequests` `t1` JOIN `BranchOffices` `t2` ON `t2`.`bo_id` = `t1`.`bo_id` WHERE `t1`.`client_id` = 1 AND `t1`.`bo_id` = 1
谢谢,抱歉我的英语很差。
答案 0 :(得分:0)
ORM的诀窍在于设想关系,而不是让它工作的命令。在ORM2中有一个hasMany关联 - 我会从那里开始。来自文档:
patient.getDoctors(function..) // List of doctors
patient.addDoctors(docs, function...) // Adds entries to join table
patient.setDoctors(docs, function...) // Removes existing entries in join table, adds new ones
patient.hasDoctors(docs, function...) // Checks if patient is associated to specified doctors
patient.removeDoctors(docs, function...) // Removes specified doctors from join table
doctor.getPatients(function..)
etc...
// You can also do:
patient.doctors = [doc1, doc2];
patient.save(...)