Sql server Node.js冗长的行是空数组,但行数正确
这是我正在运行的基本代码块。我已经按预期返回了行数(现在只有5个项目),但行作为空数组返回 我做错什么了吗?顺便说一下,我正在连接到SQLAzure。我没有任何连接问题,而且我相信我已经设置了正确的选项(RowCollectionnRequestCompletion为true) 有什么想法吗Sql server Node.js冗长的行是空数组,但行数正确,sql-server,node.js,express,tedious,Sql Server,Node.js,Express,Tedious,这是我正在运行的基本代码块。我已经按预期返回了行数(现在只有5个项目),但行作为空数组返回 我做错什么了吗?顺便说一下,我正在连接到SQLAzure。我没有任何连接问题,而且我相信我已经设置了正确的选项(RowCollectionnRequestCompletion为true) 有什么想法吗 var Connection = require('tedious').Connection; var Request = require('tedious').Request; exports.list
var Connection = require('tedious').Connection;
var Request = require('tedious').Request;
exports.list = function(req, res){
var connection = new Connection({
"userName": "myCoolUsername",
"password": "SoMePa$$word",
"server": "something.database.windows.net",
"options": {
"database": "mySampleDbName",
"encrypt": true,
"rowCollectionOnDone": true,
"rowCollectionOnRequestCompletion": true
}
});
connection.on('connect', function(err){
//if no error, then we are good to go.
if(err){
console.log(err);
}else
{
var request = new Request("SELECT * FROM Products", function(err, rowCount, rows){
console.log(rowCount);
res.send(rows);
})
connection.execSql(request);
}
});
这只是一个粗略的猜测,但从源代码看,当调用
procDone
事件时,会为行分配一个空数组。也许可以尝试将rowCollectionOnDone
设置为false?此外,请求中似乎发出了一个行
事件。你也可以订阅它,看看是否有输出。我也有同样的问题。在请求对象上使用rowCollectionOnDone:true
选项和doneInProc
事件解决,如下所示。我不知道为什么回调函数在应该返回空数组的时候返回空数组
var config = {
userName: '...',
password: '...',
server: 'localhost',
options: {
port: 2005,
database: 'db1',
rowCollectionOnDone: true
}
}
connection.execSql(new Request('SELECT * FROM Products', function(err, rowCount, rows){
if(err) {
throw err;
}
})
.on('doneInProc',function(rowCount, more, rows){
console.log(rows); // not empty
})
);
根据冗长的API
callback
function (err, rowCount, rows) { }
排
作为执行SQL语句的结果的行
仅当连接的config.options.rowCollectionOnRequestCompletion为true时才可用。
我必须使用这个配置来让它工作
var config = {
server: "localhost",
database: "*****",
userName: "sa",
password: "******",
port: 1433,
options:{rowCollectionOnRequestCompletion:true}
};
var dbConn = await this.db.connect(); // Here add your connection code in connect() function
const allRows = [];
return await new Promise((resolve,reject) => {
var SELECT_QUERY = 'SELECT * FROM your_table ';
const request = new Request(SELECT_QUERY, function(err, rowCount) {
if (err) {
return reject(err);
} else {
console.log(rowCount + ' rows');
}
});
request.on('row', function(columns) {
columns.forEach(function(column) {
const row = [];
row.push({
metadata: column.metadata,
value: column.value,
toString: () => column.value
});
allRows.push(row);
});
});
request.on('doneProc', function (rowCount, more, returnStatus, rows) {
console.log('onDoneProc');
console.log('all rows',allRows);
return resolve(allRows);
});
dbConn.execSql(request);
});
关于守则:
var request = new Request("SELECT * FROM Products", function(err, rowCount, rows) {
console.log(rowCount);
res.send(rows);
})
出现此问题的原因是未定义行。此回调仅接收2个参数:
var request = new Request("SELECT * FROM Products", function(err, rowCount) {
console.log(rowCount);
res.send(rows);
})
我必须使用这个配置来让它工作
var config = {
server: "localhost",
database: "*****",
userName: "sa",
password: "******",
port: 1433,
options:{rowCollectionOnRequestCompletion:true}
};
var dbConn = await this.db.connect(); // Here add your connection code in connect() function
const allRows = [];
return await new Promise((resolve,reject) => {
var SELECT_QUERY = 'SELECT * FROM your_table ';
const request = new Request(SELECT_QUERY, function(err, rowCount) {
if (err) {
return reject(err);
} else {
console.log(rowCount + ' rows');
}
});
request.on('row', function(columns) {
columns.forEach(function(column) {
const row = [];
row.push({
metadata: column.metadata,
value: column.value,
toString: () => column.value
});
allRows.push(row);
});
});
request.on('doneProc', function (rowCount, more, returnStatus, rows) {
console.log('onDoneProc');
console.log('all rows',allRows);
return resolve(allRows);
});
dbConn.execSql(request);
});
设置“RowCollectionnRequestCompletion”为true
嗨,菲利普。谢谢你的回答。请不要写诸如“rows=undefined=>此回调仅获取2个参数”之类的神秘消息。我读了好几遍才明白你在说什么。请以忙碌的专业人士能够快速理解的方式清楚地给出您的答案。干杯