在Sails JS中检索多个结果集 [英] Retrieve multiple result sets in sails js

问题描述

我正在将Sails js与它的 sails-mssqlserver 适配器一起使用.问题在于，如果我的存储过程返回了多个结果集，那么我只会收到一个最新的结果集. 相同的存储过程可以在Java上正常工作，我可以遍历相关的结果集.

I am using sails js with it sails-mssqlserver adapter. The problem with it is that if my stored procedure returns multiple result sets then I only receive one result set which is the latest of all. The same stored procedure is working fine with Java and I get to iterate over the relevant result sets.

我需要知道是否有一些特定的方法可以访问sails-mssqlserver中的所有结果集吗?

I need to know if there is some specific way to access all result sets in sails-mssqlserver?

推荐答案

sails-mssqlserver适配器是Node.js官方Microsoft SQL Server客户端的包装，该客户端可用

The sails-mssqlserver adapter is a wrapper of the official Microsoft SQL Server client for Node.js available here its dependecy however is not on the latest release.

选项1: 根据MsSQL软件包的官方文档，您可以使用request.multiple = true命令在查询中启用多个记录集.

Option 1: As per this official documentation of the MsSQL package, you can enable multiple recordsets in queries with the request.multiple = true command.

要在sails-mssqlserver适配器中启用多个查询/记录集，一个小小的解决方法是打开sails-mssqlserver/lib/adapter.js并编辑原始查询功能.在var request = new mssql.Request(mssqlConnect)下添加request.multiple = true.如下例所示.

To enable multiple queries/recordsets in the sails-mssqlserver adapter, a hackish workaround is to open sails-mssqlserver/lib/adapter.js and edit the raw query function. Adding request.multiple = true below var request = new mssql.Request(mssqlConnect). As shown in the example below.

// Raw Query Interface
query: function (connection, collection, query, data, cb) {
  if (_.isFunction(data)) {
    if (debugging) {
      console.log('Data is function. A cb was passed back')
    }
    cb = data
    data = null
  }

  adapter.connectConnection(connection, function __FIND__ (err, uniqId) {
    if (err) {
      console.error('Error inside query __FIND__', err)
      return cb(err)
    }

    uniqId = uniqId || false
    var mssqlConnect
    if (!uniqId) {
      mssqlConnect = connections[connection].mssqlConnection
    } else {
      mssqlConnect = connections[connection].mssqlConnection[uniqId]
    }

    var request = new mssql.Request(mssqlConnect)

    // Add it here
    request.multiple = true

    request.query(query, function (err, recordset) {
      if (err) return cb(err)
      if (connections[connection] && !connections[connection].persistent) {
        mssqlConnect && mssqlConnect.close()
      }
      cb(null, recordset)
    })
  })
},

现在返回的记录集应包含多个结果.

Now the returned recordset should contain multiple results.

选项2: 对于运行返回多个记录集的存储过程的用例，一种更可持续的选择是对Node.js使用最新版本的官方Microsoft SQL Server客户端.有关运行存储过程的信息，请此处

Option 2: A more sustainable option for use cases where running a stored procedure which returns multiple recordsets, is to use the latest version of the official Microsoft SQL Server client for Node.js. Information on running stored procedures is available here

首先安装最新的软件包:

First install the latest package:

npm install mssql --save

在您要运行存储过程的代码中，添加与mssql数据库的连接:

In your code where you would like to run the stored procedure add a connection to the mssql database:

// require the mssql package
const sql = require('mssql')

// make a connection, you can use the values you have already stored in your adapter
const pool = new sql.ConnectionPool({
    user: sails.config.connections.<yourMsSQLConnection>.user,
    password: sails.config.connections.<yourMsSQLConnection>.password,
    server: sails.config.connections.<yourMsSQLConnection>.server,
    database: sails.config.connections.<yourMsSQLConnection>.database
})

// connect the pool and test for error 
pool.connect(err => {
    // ...
})

// run the stored procedure using request
const request = new sql.Request()
request.execute('procedure_name', (err, result) => {
    // ... error checks 
    console.log(result.recordsets.length) // count of recordsets returned by the procedure
    console.log(result.recordsets[0].length) // count of rows contained in first recordset
    console.log(result.recordset) // first recordset from result.recordsets
    console.log(result.returnValue) // procedure return value
    console.log(result.output) // key/value collection of output values
    console.log(result.rowsAffected) // array of numbers, each number represents the number of rows affected by executed statemens 
    // ...
})

// you can close the pool using
pool.close()

在sails- *数据库适配器未包含您需要的所有功能的情况下.我发现最好创建一个包含附加功能的sails Service.这是一个非常干净的解决方案.

In cases, where the sails-* database adapter doesn't include all the functionality you require. I find it best to create a sails Service that wraps the additional functionality. It is a really clean solution.

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