mysql - sync-mysql node js中使用变量调用query

Question

var mysql= require('sync-mysql');
var connection = new mysql({
    host: 'host-name',
    user: 'root',
    password: 'password',
    database: 'tables', //name of the database
    multipleStatements: true
});

var val="value"
const ans= connection.queueQuery("Select * from table Where col_1=val";);
console.log(ans());

尽管此类列存在一个元组，但查询返回的是一个空数组。我如何在查询中使用局部变量？

Answer 1

你可以使用 ES6 Template literals:

const ans = connection.queueQuery(`Select * from table Where col_1 = ${val}`);

或者简单的连接:

const ans = connection.queueQuery('Select * from table Where col_1 = ' + val);