数据不会存储在数组中

Question

我试图从WebSQL获取数据然后放入名为storeArr的数组中。但是，每次调试时，数组的长度都为0.我无法检测到此代码中的错误。

    if(button == 1){
       var compare =  a + b + d + e + f + g;
       var storeArr = [];
       var duplicate =  "";
        db.transaction(function (tx) {
              tx.executeSql('SELECT * FROM RentalZ_', [], function (tx, sqlResultSet) {
              var len = sqlResultSet.rows.length;
              for (i = 0; i < len; i++){
              var data = sqlResultSet.rows.item(i);
               storeArr.push(data.property_type + data.rooms + data.rent + data.furniture + data.notes + data.name);

                    }
                }, null);
        });
        console.log(storeArr.length);
       for(i = 0; i < storeArr.length; i++){
            if(storeArr[i] == compare){
                duplicate = "YES";
                break;
            }
       }

       if(duplicate != "YES"){
            console.log("Data Successfully Added!");
            alert("added");
            db.transaction(function (tx) {
              tx.executeSql('INSERT INTO RentalZ_ (property_type, rooms, date_time, rent, furniture, notes, name) VALUES(?,?,?,?,?,?,?)',[a,b,c,d,e,f,g]);
            });
       } else {
       alert("nan");
            console.log("Duplicate Data Detected!");
       }
    }