nodejs查询数据库后,获取result结果集并赋值返回

nodejs获取了查询结果,但不能返回出去,

情形如下:

var query = function (path,id,param,sqlWhere,res){
    var aa = 111;
var sql = "select * from user"; var mysql = dbHelper.getMysql(); mysql.query({ sql: sql }, function (err, rows) { res.end(JSON.stringify(rows)); aa = rows; });
return aa;//返回结果是111而不是rows
};

解决方式

var query = function (path,id,param,sqlWhere,res){
    var promise = new Promise(function (resolve, reject) {
        
        var sql = getFileSql(path,id,param,sqlWhere);
        var mysql = dbHelper.getMysql();
        mysql.query({
          sql: sql
        }, function (err, rows) {
            res.end(JSON.stringify(rows));
            resolve(rows);//关键
        });    
    
    });
    promise.then(function (value) {
        console.log(value);
        return value;
    }, function (value) {});
    return promise;
};

完毕:

 

=====================================原文内容如下======================================

http://www.jianshu.com/p/6e77d6fdaf13

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