Node.js MySQL LCASE()函数
LCASE()函数是 MySQL 中的内置函数,用于将给定字符串的所有字符转换为小写。
句法:
LCASE(input_string)
参数:它需要一个参数,如下所示:
- input_string : 输入字符串,作为参数传递以将此字符串转换为小写。
返回值:返回一个新的小写字符串。
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 LCASE('This iNpUT strinG @!#$%^&*()?') AS lowercase_name";
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 LCASE(name) AS lowercase_name 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 LCASE(name) AS lowercase_name 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: