Node.js MySQL Limit

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Node.js Tutorial » Node.js MySQL Limit

"LIMIT" statement is used to set the number of records returned from the SQL Query.

Syntax:

"SELECT * FROM table_name LIMIT value"

Let us to have a table "Users" as:

ID	Name	Email	wage
1	Clark K	clarkkent@mail.com	1950
2	John Carter	johncarter@mail.com	2400
3	Peter Parker	clarkkent@mail.com	3125
4	Johny Alson	johnyAlson@mail.com	2460
5	Pierre Alexander	pierrealexander@mail.com	3000
6	Nick Boss	NickBoss@mail.com	2430
7	Json Nei	Json-Nei@mail.com	2900

Node js MySQL Limit Clause

We select 4 first rows from "Users" table:

Example: UPDATE records

var mysql = require('mysql');

var conn = mysql.createConnection({
host: "localhost",
user: "your_username",
password: "your_password",
database: "my_db_name"
});

conn.connect(function(err) {
if (err) throw err;
var sql = "SELECT * FROM Users LIMIT 4";
conn.query(sql, function (err, result) {
if (err) throw err;
console.log(result);
});
});

Save the code above in a file named "demo_test_db_limit.js", and run the file:

E:\Users\Your_Name>node demo_test_db_limit.js

Which will give you this result after run the file your table will be:

ID	Name	Email	wage
1	Clark K	clarkkent@mail.com	1950
2	John Carter	johncarter@mail.com	2400
3	Peter Parker	clarkkent@mail.com	3125
4	Johny Alson	johnyAlson@mail.com	2460

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MySQL limit offset

If you need to return 5 rows, starting from second record, you have to use " OFFSET " keyword:

Example:

var mysql = require('mysql');

var conn = mysql.createConnection({
host: "localhost",
user: "your_username",
password: "your_password",
database: "my_db_name"
});

conn.connect(function(err) {
if (err) throw err;
var sql = "SELECT * FROM Users LIMIT 5 OFFSET 1";
conn.query(sql, function (err, result) {
if (err) throw err;
console.log(result);
});
});

Save the code above in a file called "demo_test_db_offset2.js", and run the file:

Example: : Run "demo_test_db_offset2.js"

E:\Users\Your_Name>node demo_test_db_offset2.js

Your database will be:

ID	Name	Email	wage
2	John Carter	johncarter@mail.com	2400
3	Peter Parker	clarkkent@mail.com	3125
4	Johny Alson	johnyAlson@mail.com	2460
5	Pierre Alexander	pierrealexander@mail.com	3000
6	Nick Boss	NickBoss@mail.com	2430

Note: "OFFSET 1", this means starting from the second position, not from the first!
If you have "OFFSET 25" this mean starting from 26 row.

OFFSET Shorter Syntax

For Shorter OFFSET Syntax you can have something like this "LIMIT 1, 5" which returns the same as above example OFFSET:

Example:

var mysql = require('mysql');

var conn = mysql.createConnection({
host: "localhost",
user: "your_username",
password: "your_password",
database: "my_db_name"
});

conn.connect(function(err) {
if (err) throw err;
var sql = "SELECT * FROM Users LIMIT 1, 5";
conn.query(sql, function (err, result) {
if (err) throw err;
console.log(result);
});
});

Note: "LIMIT 1, 5" is the same as "LIMIT 5 OFFSET 1"

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What is connection limit in node js?
What is MySQL connection pooling?
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Node.js MySQL Limit - nodejs

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