Paso 3: Prueba de concepto de la conexión a SQL mediante Node.js

Descargar un controlador de SQL para Node.js

Solo debe considerarse a este ejemplo una prueba de concepto. El código de ejemplo se simplifica para mayor claridad y no representa necesariamente los procedimientos recomendados por Microsoft. Otros ejemplos que usan las mismas funciones cruciales están disponibles en GitHub:

• https://github.com/tediousjs/tedious/blob/master/examples/

Paso 1: Conectar

La función new Connection se utiliza para conectarse a SQL Database.

    var Connection = require('tedious').Connection;  
    var config = {  
        server: 'your_server.database.windows.net',  //update me
        authentication: {
            type: 'default',
            options: {
                userName: 'your_username', //update me
                password: 'your_password'  //update me
            }
        },
        options: {
            // If you are on Microsoft Azure, you need encryption:
            encrypt: true,
            database: 'your_database'  //update me
        }
    };  
    var connection = new Connection(config);  
    connection.on('connect', function(err) {  
        // If no error, then good to proceed.
        console.log("Connected");  
    });
    
    connection.connect();

Paso 2: Ejecutar una consulta

Todas las instrucciones SQL se ejecutan utilizando la función new Request() . Si la instrucción devuelve filas, como una instrucción select, se podrán recuperar mediante la función request.on() . Si no hay ninguna fila, la función request.on() devuelve listas vacías.

    var Connection = require('tedious').Connection;  
    var config = {  
        server: 'your_server.database.windows.net',  //update me
        authentication: {
            type: 'default',
            options: {
                userName: 'your_username', //update me
                password: 'your_password'  //update me
            }
        },
        options: {
            // If you are on Microsoft Azure, you need encryption:
            encrypt: true,
            database: 'your_database'  //update me
        }
    }; 
    var connection = new Connection(config);  
    connection.on('connect', function(err) {  
        // If no error, then good to proceed.  
        console.log("Connected");  
        executeStatement();  
    });  
    
    connection.connect();
  
    var Request = require('tedious').Request;  
    var TYPES = require('tedious').TYPES;  
  
    function executeStatement() {  
        var request = new Request("SELECT c.CustomerID, c.CompanyName,COUNT(soh.SalesOrderID) AS OrderCount FROM SalesLT.Customer AS c LEFT OUTER JOIN SalesLT.SalesOrderHeader AS soh ON c.CustomerID = soh.CustomerID GROUP BY c.CustomerID, c.CompanyName ORDER BY OrderCount DESC;", function(err) {  
        if (err) {  
            console.log(err);}  
        });  
        var result = "";  
        request.on('row', function(columns) {  
            columns.forEach(function(column) {  
              if (column.value === null) {  
                console.log('NULL');  
              } else {  
                result+= column.value + " ";  
              }  
            });  
            console.log(result);  
            result ="";  
        });  
  
        request.on('done', function(rowCount, more) {  
        console.log(rowCount + ' rows returned');  
        });  
        
        // Close the connection after the final event emitted by the request, after the callback passes
        request.on("requestCompleted", function (rowCount, more) {
            connection.close();
        });
        connection.execSql(request);  
    }  

Paso 3: Inserción de una fila

En este ejemplo se muestra cómo ejecutar una instrucción INSERT de forma segura y pasar parámetros que protejan la aplicación de los valores de inyección de código SQL.

    var Connection = require('tedious').Connection;  
    var config = {  
        server: 'your_server.database.windows.net',  //update me
        authentication: {
            type: 'default',
            options: {
                userName: 'your_username', //update me
                password: 'your_password'  //update me
            }
        },
        options: {
            // If you are on Microsoft Azure, you need encryption:
            encrypt: true,
            database: 'your_database'  //update me
        }
    };  
    var connection = new Connection(config);  
    connection.on('connect', function(err) {  
        // If no error, then good to proceed.  
        console.log("Connected");  
        executeStatement1();  
    });
    
    connection.connect();
    
    var Request = require('tedious').Request  
    var TYPES = require('tedious').TYPES;  
  
    function executeStatement1() {  
        var request = new Request("INSERT SalesLT.Product (Name, ProductNumber, StandardCost, ListPrice, SellStartDate) OUTPUT INSERTED.ProductID VALUES (@Name, @Number, @Cost, @Price, CURRENT_TIMESTAMP);", function(err) {  
         if (err) {  
            console.log(err);}  
        });  
        request.addParameter('Name', TYPES.NVarChar,'SQL Server Express 2014');  
        request.addParameter('Number', TYPES.NVarChar , 'SQLEXPRESS2014');  
        request.addParameter('Cost', TYPES.Int, 11);  
        request.addParameter('Price', TYPES.Int,11);  
        request.on('row', function(columns) {  
            columns.forEach(function(column) {  
              if (column.value === null) {  
                console.log('NULL');  
              } else {  
                console.log("Product id of inserted item is " + column.value);  
              }  
            });  
        });

        // Close the connection after the final event emitted by the request, after the callback passes
        request.on("requestCompleted", function (rowCount, more) {
            connection.close();
        });
        connection.execSql(request);  
    }