我想通过连接两个不使用关系“关联”的表来检索数据。这两个表如下所示:续集连接两个不关联的表
mysql> desc partner_txns;
+------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| txn_id | int(11) | NO | | NULL | |
| user_id | int(11) | NO | MUL | NULL | |
| txn_type | varchar(1) | YES | | NULL | |
| txn_amnt | double | YES | | NULL | |
| desc | varchar(64) | YES | | NULL | |
| createdBy | int(11) | NO | MUL | NULL | |
| created_on | datetime | NO | | NULL | |
+------------+-------------+------+-----+---------+----------------+
8 rows in set (0.00 sec)
mysql> desc accounts_master;
+-------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | varchar(64) | NO | | NULL | |
| owner | int(11) | NO | MUL | NULL | |
| type | int(11) | YES | | 0 | |
| expires_on | datetime | NO | | NULL | |
| max_lists | int(11) | YES | | 10 | |
| max_groups | int(11) | YES | | 10 | |
| createdBy | int(11) | NO | MUL | NULL | |
| modifiedBy | int(11) | NO | MUL | NULL | |
| created_on | datetime | NO | | NULL | |
| modified_on | datetime | NO | | NULL | |
+-------------+-------------+------+-----+---------+----------------+
11 rows in set (0.00 sec)
不使用sequelize,通常我会做一个SQL查询是这样的:
mysql> select a.user_id, b.name from partner_txns a, accounts_master b where a.createdBy = 3 and a.user_id = b.owner;
+---------+-------------+
| user_id | name |
+---------+-------------+
| 8 | New account |
| 8 | Comviva |
| 8 | Infosys |
| 9 | HDFC |
| 9 | INTEGRA |
+---------+-------------+
5 rows in set (0.00 sec)
什么是做这个用Sequelize相当于,假设我有这两个表作为两种型号如下:
- PartnerTxn
- 帐户
我很想使用像:
var Model = require('ecp_model');
Model.PartnerTxn.findAll({
where: {createdBy:3 },
include : [{model:Model.Account, attribute:['name']}]
}).then(function(results) {
console.log("results:", results);
});
[[email protected] authserver]$
但随后这是行不通的,因为这两个表都没有关系。所以,我得到一个错误如下:
Unhandled rejection Error: Account is not associated to PartnerTxn!
at validateIncludedElement (/var/opt/ecp_db/node_modules/sequelize/lib/model.js:569:11)
at /var/opt/ecp_db/node_modules/sequelize/lib/model.js:452:29
at Array.map (native)
at validateIncludedElements (/var/opt/ecp_db/node_modules/sequelize/lib/model.js:448:37)
at null.<anonymous> (/var/opt/ecp_db/node_modules/sequelize/lib/model.js:1360:32)
at tryCatcher (/var/opt/ecp_db/node_modules/bluebird/js/release/util.js:16:23)
at Promise._settlePromiseFromHandler (/var/opt/ecp_db/node_modules/bluebird/js/release/promise.js:503:31)
at Promise._settlePromise (/var/opt/ecp_db/node_modules/bluebird/js/release/promise.js:560:18)
at Promise._settlePromise0 (/var/opt/ecp_db/node_modules/bluebird/js/release/promise.js:605:10)
at Promise._settlePromises (/var/opt/ecp_db/node_modules/bluebird/js/release/promise.js:684:18)
at Async._drainQueue (/var/opt/ecp_db/node_modules/bluebird/js/release/async.js:126:16)
at Async._drainQueues (/var/opt/ecp_db/node_modules/bluebird/js/release/async.js:136:10)
at Immediate.Async.drainQueues [as _onImmediate] (/var/opt/ecp_db/node_modules/bluebird/js/release/async.js:16:14)
at processImmediate [as _immediateCallback] (timers.js:383:17)
你为什么不把它们联系起来? – Adam
partner_txns的user_id字段链接到另一个表(users_master)中的ID。同样,accounts_master的所有者字段链接到(users_master)中的id。这意味着有第三个表“users_master”,所以qn中的这两个表格不会直接相互关联。 –