mysql - 按查询动态分组

Question

我需要使用数组通过查询来触发动态组。

a=['Branch','Company','Name'];

现在，我需要像这样的查询

"select Branch,Company,Name,count(Name) as count from myTable group by Branch,Company,Name;"

请推荐！！

Answer 1

使用您的初始问题数据：

a=['Branch','Company','Name'];

function addCount(a) {
    db.transaction(function (tx) {
        str=a.join(", ");
        tx.executeSql("select "+str+",count(*) as count from documentProperty GROUP BY "+str+";", [], function (tx, result) {
            if (result != null && result.rows != null) {
                for (var i = 0; i < result.rows.length; i++) {
                    var row = result.rows.item(i);
                    console.log(row);
                }
            }
        });
    });
}

Answer 2

谢谢大家，我试过了，终于从下面的代码中得到了我的结果。

jsonString=[{"field":"Branch"},{"field":"Company"},{"field":"Name"}]

function addCount(jsonString){
    var a=[];
    var str="";
    $.each(jsonString,function (i,result){
        a.push(result.field);
        if(i == jsonString.length-1){
            str += result.field; 
        } else{
             str += result.field+",";
        }
    });
          db.transaction(function (tx) {
            var q=(a.length-1);

            var query="select "+str+",count("+a[q]+") as count from documentProperty GROUP BY "+str+";";        console.log(query);
            tx.executeSql(query, [], function (tx, result) {
                if (result != null && result.rows != null) {
                    for (var i = 0; i < result.rows.length; i++) {
                        var row = result.rows.item(i);
                        console.log(row);
                    }
                }
            });
         });

} 

Answer 3

尝试这个：

String quryString = "select Branch,Company,Name,count(Name) as count from myTable group by " ;

for (int i = 0; i < a.length; i++)
    quryString =quryString +a[i];

现在使用 quryString 并触发您的查询。