Node.js MySQL Select From

Selecting From a Table

To select data from a table in MySQL, use the "SELECT" statement.

Example

let mysql = require('mysql');
let con = mysql.createConnection({
host: "localhost", user: "yourusername", password: "yourpassword", database: "mydb"
});
con.connect(function(err) {
if (err) throw err;
con.query("
SELECT * FROM customers
", function (err, result, fields) {
if (err) throw err;
console.log(result);
});
});
SELECT *
will return all columns
Save the code above in a file called "demo_db_select.js" and run the file:
Run "demo_db_select.js"

Your Name

{ id: 1, name: 'John', address: 'Highway 71'},
{ id:
2, name: 'Peter', address: 'Lowstreet 4'},
{ id: 3, name: 'Amy', address: 'Apple st 652'},
{ id: 4, name: 'Hannah', address:
'Mountain 21'},
{ id: 5, name: 'Michael', address: 'Valley 345'},
{ id: 6, name: 'Sandy', address: 'Ocean blvd 2'},
{ id: 7, name: 'Betty', address: 'Green Grass 1'},
{ id: 8, name: 'Richard', address: 'Sky st 331'},
{ id: 9, name: 'Susan', address: 'One way
98'},
{ id: 10, name: 'Vicky', address: 'Yellow Garden 2'},
{ id: 11, name: 'Ben', address: 'Park Lane 38'},
{ id: 12, name: 'William', address: 'Central st 954'},
{ id: 13, name: 'Chuck', address:
'Main Road 989'},
{ id: 14, name: 'Viola', address: 'Sideway
1633'}

Selecting Columns

To select only some of the columns in a table, use the "SELECT" statement followed by the column name.

Example

let mysql = require('mysql');
let con = mysql.createConnection({
host: "localhost", user: "yourusername", password: "yourpassword", database: "mydb"
});
con.connect(function(err) {
if (err) throw err;
con.query("

", function (err, result, fields) {
if (err) throw err;
console.log(result);
});
});
Save the code above in a file called "demo_db_select2.js" and run the file:
Run "demo_db_select2.js"

Your Name

{ name: 'John', address: 'Highway 71'},
{ name: 'Peter', address: 'Lowstreet 4'},
{ name: 'Amy', address: 'Apple st 652'},
{ name: 'Hannah', address:
'Mountain 21'},
{ name: 'Michael', address: 'Valley 345'},
{ name: 'Sandy', address: 'Ocean blvd 2'},
{
name: 'Betty', address: 'Green Grass 1'},
{ name: 'Richard', address: 'Sky st 331'},
{ name: 'Susan', address: 'One way
98'},
{ name: 'Vicky', address: 'Yellow Garden 2'},
{ name: 'Ben', address: 'Park Lane 38'},
{ name: 'William', address: 'Central st 954'},
{ name: 'Chuck', address:
'Main Road 989'},
{ name: 'Viola', address: 'Sideway
1633'}

The Result Object

Example

console.log(result[2].address);

Which will produce this result:

Apple st 652

The Fields Object

Example

let mysql = require('mysql');
let con = mysql.createConnection({
host: "localhost", user: "yourusername", password: "yourpassword", database: "mydb"
});
con.connect(function(err) {
if (err) throw err;
con.query("SELECT name, address FROM customers", function (err, result, fields
) {
if (err) throw err;
console.log(

);
});
});
Save the code above in a file called "demo_db_select_fields.js" and run the file:
Run "demo_db_select_fields.js"

Your Name

{
catalog: 'def', db:
'mydb', table: 'customers', orgTable: 'customers', name: 'name', orgName: 'name', charsetNr: 33, length: 765, type: 253, flags: 0, decimals: 0, default: undefined, zeroFill: false, protocol41: true
},
{
catalog: 'def', db: 'mydb', table: 'customers', orgTable: 'customers', name: 'address', orgName: 'address', charsetNr: 33, length: 765, type:

}

Example

console.log(fields[1].name);

Which will produce this result: