Question

I have a server with 3 databases with identical tables.

DB1, DB2 and DB3.

When I work with a database I use:

app.js

var cnxDB= require('./routes/cnxDB');
app.post('/userSave', cnxDB.userSave);

cnxDB.js:

var sql = require('mssql'); 
var qs = require('querystring');
var colors = require('colors');
var config = {user: 'user',password: 'pass',server: '127.0.0.1',database: nameDB',
    options: {
        encrypt: false
    }
};
sql.connect(config, function(err) {
   //Connection
});
exports.userSave = function(req, res) {
    //response
};

When initializing the application immediately makes the connection to the database.

I need to know how you can do to choose the database.

app.post('/selectBD', function(req, res){
  var body = req.body; // accede a la información enviada por el socket
  console.log(body);
  if(body.cnx == 1)
  {
    var cnx = require('./routes/bdUno');
    app.get('/yuri', cnx.findall);
  }
  if(body.cnx == 2)
  {
    var cnx = require('./routes/bdDos');
    app.get('/yuri', cnx.findall);
  }
  if(body.cnx == 3)
  {
    var cnx = require('./routes/bdTres');
    app.get('/yuri', cnx.findall);
  }

  res.status(200).json("Ok");
});

Thank you.

Answer 1

在cnxDB.js设置3个连接：

var connections = {
    <dbname>: null,
    <dbname>: null,
    <dbname>: null
}

转到mssql并查看＆＃34;快速示例＆＃34;。它创建一个连接并将其保存在变量中。您希望为每个数据库执行3次，并将其保存在connections下相应的数据库名称下。

然后，从cnxDB.js导出的函数应该可以知道您希望它们使用哪个数据库。通过它的外观，您希望有一些指示在该请求的主体中需要使用什么数据库。您可以使用它来选择数据库。

How I can access multiple DB using ExpressJS?

1 个答案: