从MySQL数据库获取数据并添加到列表（NodeJS）

Question

So using a list of ids, I'm trying to get data for each element in the database and add that element to a list. At the end, I'm displaying it on an HTML page. How would I do that? Right now, since it executes the queries async, the list will be empty after running the code to execute the query and add the result to a list.

Answer 1

Lets assume you have a table called teams that contains a row for each team, with columns like id , games , total_points , wins , and losses .

Lets assume you have an array of team id . You want to query the database for those records, then do some things with them before returning them to the front end as json.

This is how i understand your problem. If this isn't the case, please clarify in a comment on this answer.

Possible solution: Do it all in one query. I'm going to use my favorite mysql library, knexjs .

var columns = ['id', 'games', 'total_points', 'wins', 'loses'];

function getTeams(ids){
  return knex.select(columns).where('id', 'in', ids)
    .then((teams) => {
      //do whatever with array of teams
      return teams;
    }
}

It's pretty much as simple as that.