如何在 DAL 中设计一个方法来从数据库中检索各种结果？
我们已经设计了我们的数据访问层，它的一部分工作起来没有任何问题，但我们对设计一种方法有一些疑问，以从我们这里获取 sqlcommand 的引用并从数据库返回单行数据，而且检索到的数据也有一个未知数数据类型 这就是我所做的：
//I am using this class as retrieval datatype for now i have only 3 returning data types
public class retDataTypes {
public bool ansBool;
public int ansInt;
public string ansString;
}
public class doQuery {
public retDataTypes returnAnswer(ref sqlcommand cmd , string typeHelper) {
//opening the sqlconnection
//pass the cmd then
retDataTypes answer = new retDataTypes();
//in most of the cases we need only one row result so that I'm using executeScalar()
switch (typeHelper) {
case "string" :
answer.ansString = cmd.executescalar();
break;
case "int" :
answer.ansInt = cmd.executescalar();
break;
case "bool" :
answer.ansBool = cmd.executescalar();
break;
}
return answer;
}
我需要你对这种方法的意见，它好吗（我知道它效率不高），还有比这更好的方法吗？
请告诉我。
问候。
we have designed our Data Access Layer and parts of it works as a charm without any problem but we have some doubts about designing a method to get a reference of sqlcommand from us and return a single row data from database also the retrieved data has an unknown data type
here is what I've done :
//I am using this class as retrieval datatype for now i have only 3 returning data types
public class retDataTypes {
public bool ansBool;
public int ansInt;
public string ansString;
}
public class doQuery {
public retDataTypes returnAnswer(ref sqlcommand cmd , string typeHelper) {
//opening the sqlconnection
//pass the cmd then
retDataTypes answer = new retDataTypes();
//in most of the cases we need only one row result so that I'm using executeScalar()
switch (typeHelper) {
case "string" :
answer.ansString = cmd.executescalar();
break;
case "int" :
answer.ansInt = cmd.executescalar();
break;
case "bool" :
answer.ansBool = cmd.executescalar();
break;
}
return answer;
}
I need your opinion about this approach is it good ( I know its not efficient) and is there any better ways than this?
please let me know.
regards.
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传入不带“ref”的 SqlCommand。
将返回类型“retDataTypes”更改为“object”并将其转换为您在调用函数中期望的类型。
Pass in the SqlCommand without 'ref'.
Change the return type 'retDataTypes' to 'object' and cast it to the type you expect in the calling function.