Question

我正在尝试从mySQL查询中调用javascript变量。这些行在node.js环境中使用语法[node（filename）]执行。我了解我可以分两步执行此查询，方法是先查询min_value的值，然后查询max_value。

能否在一个mySQL查询中执行请求？

优选地，我希望保留香草js和mySQL的代码结构，而无需添加特定于node.js的命令，也无需加载额外的软件包。

JavaScript变量：

let min_value = 100;
let max_value = 300;

这有效：

sql = `
 SELECT
   acronym,
   salaries
 FROM 
   employees
 WHERE
   salaries BETWEEN 100 and 300
ORDER BY acronym;
`;

这不起作用：

sql = `
 SELECT
   acronym,
   salaries
 FROM 
   employees
 WHERE
   salaries BETWEEN ($min_value) and ($max_value)
ORDER BY acronym;
`;

Answer 1

尝试使用${variable}占位符语法使用Template Literals：

let min_value = 100;
let max_value = 300;
let sql1 = `
 SELECT
   acronym,
   salaries
 FROM 
   employees
 WHERE
   salaries BETWEEN (${min_value}) and (${max_value})
ORDER BY acronym;
`;

let sql2 = `
 SELECT
   acronym,
   salaries
 FROM 
   employees
 WHERE
   salaries BETWEEN ${min_value} and ${max_value}
ORDER BY acronym;
`;

console.log(sql1);
console.log(sql2);

node.js-从mysql查询中调用javascript变量

1 个答案: