节点. js MySQL 从表中选择
原文:https://www . geesforgeks . org/node-js-MySQL-select-from-table/
简介:了解使用 node.js 从 MySQL 数据库中选择数据，我们将使用标准的 SELECT FROM SQL 查询。
语法:
SELECT [column] FROM [table_name]
示例:
1) SELECT * FROM customers
selecting all columns from customers table.
2) SELECT name, address FROM customers
SQL 用户表预览:
示例 1: 从用户表中选择所有列
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");
// This query will be used to select columns
let query = 'SELECT * FROM users';
db_con.query(query, (err, rows) => {
if(err) throw err;
console.log(rows);
});
});
输出:
示例 2: 从用户表中选择名称列
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");
// notice the name column below
let query = 'SELECT name FROM users';
db_con.query(query, (err, rows) => {
if(err) throw err;
console.log(rows);
});
});
输出:
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