Implementation of the basic writing method of adding, deleting, modifying and querying MySql in NodeJS-Mysql Tutorial-php.cn

Purely record the most basic writing method. There is almost no logic and the writing method is not very perfect (because I have just figured out how to write like this...= =!) I hope experts can give me some advice and I hope it can help. To a newbie who is newer than me....

//1.insert operation

let insertSql = 'insert into User(username ,password,name,gender,age) values (?,?,?,?,?)';

let insertParams = [username, password, name, gender, age];

mysqlConnection.query(insertSql, insertParams, function (error, results, fields) {

　if (error) throw error;

return results;

});

//2.select operation (when I tested it myself, I found that string type columns need to add additional quotation marks to the parameters, otherwise they will be treated as numeric types or column names)

let selectSql = 'select id from User where username = \''.concat(username, '\' and password = \'', password, '\'');

mysqlConnection.query(selectSql, function (error, results, fields) {

　if(error) throw error;

　return results;

});

//3.delete operation

let deleteSql = 'delete from user where id = \''.concat(id, '\'');

mysqlConnection.query(deleteSql, function (error, results, fields) {

if (error) throw error;

return results;

}) ;

//4.update operation

let updateSql = 'update User set age = 30 where id = \''.concat(id, ' \'');

mysqlConnection.query(updateSql, function (error, results, fields) {

if (error) throw error;

return results;

});

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