c# help with building where clause to query
-
27-09-2019 - |
Question
i am newbie in c#,
i want to build query string , i do some conditions , every condition add another condition to where clause
i want something like that :
// BUILD SELECT QUERY
string where = "";
string[] where_arr = new string[];
if (condition1)
{
where_arr[index++] = " field = 5 ";
}
if (condition2)
{
where_arr[index++] = " field2 = 7 ";
}
if (where_arr.Count>0)
where = " where" + String.Join(" and ", where_arr);
string sql = "select count(*) as count from mytable " + where;
but i do not know exactly how to declare all the variables like where_arr
Solution
// BUILD SELECT QUERY
string where = "";
List<string> where_arr = new List<string>();
if (condition1)
{
where_arr.Add(" field = 5 ");
}
if (condition2)
{
where_arr.Add(" field2 = 7 ");
}
if (where_arr.Count > 0)
where = " where" + String.Join(" and ", where_arr.ToArray());
string sql = "select count(*) as count from mytable " + where;
Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow