📜  Node.js MySQL FORMAT()函数

📅  最后修改于: 2022-05-13 01:56:18.877000             🧑  作者: Mango

Node.js MySQL FORMAT()函数

FORMAT()函数是 MySQL 中的一个内置函数,用于将输入数字格式化为…**、***、***的格式,还可以将浮点数舍入到特定的小数位数。

句法:

FORMAT(number, number_of_decimal_places)

参数:它需要两个参数,如下所示:

  • number:用于格式化的数字。
  • number_of_decimal_places:小数位数。

返回值:它以…**、***、***的格式将格式化的数字作为字符串返回。

模块安装:使用以下命令安装mysql模块:

npm install mysql

数据库:我们的 SQL发布者 带有示例数据的表格预览如下所示:

示例 1:

index.js
const mysql = require("mysql");
  
let db_con  = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: '',
    database: 'gfg_db'
});
  
db_con.connect((err) => {
    if (err) {
      console.log("Database Connection Failed !!!", err);
      return;
    }
  
    console.log("We are connected to gfg_db database");
  
    // Here is the query
    let query = "SELECT FORMAT(12345678.12555, 2) AS output";
  
    db_con.query(query, (err, rows) => {
        if(err) throw err;
  
        console.log(rows);
    });
});


index.js
const mysql = require("mysql");
  
let db_con  = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: '',
    database: 'gfg_db'
});
  
db_con.connect((err) => {
    if (err) {
      console.log("Database Connection Failed !!!", err);
      return;
    }
  
    console.log("We are connected to gfg_db database");
  
    // Here is the query
    let query = 
"SELECT FORMAT(salary, 1) AS formatted_salary FROM publishers";
  
    db_con.query(query, (err, rows) => {
        if(err) throw err;
  
        console.log(rows);
    });
});


使用以下命令运行index.js文件:

node index.js

输出:

示例 2:

index.js

const mysql = require("mysql");
  
let db_con  = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: '',
    database: 'gfg_db'
});
  
db_con.connect((err) => {
    if (err) {
      console.log("Database Connection Failed !!!", err);
      return;
    }
  
    console.log("We are connected to gfg_db database");
  
    // Here is the query
    let query = 
"SELECT FORMAT(salary, 1) AS formatted_salary FROM publishers";
  
    db_con.query(query, (err, rows) => {
        if(err) throw err;
  
        console.log(rows);
    });
});

使用以下命令运行index.js文件:

node index.js

输出: