executescalar int
ExecuteScalar方法返回的类型是object类型，这个方法返回sql语句执行后 ... 有可能是int，有可能是char等等），所以ExecuteScalar方法返回一个最 ..., Just change the code as: int countDis = Convert.ToInt32(cmd.ExecuteScalar());. This will ensure that even if ExecuteScalar returns null , as ..., （1）ExecuteNonQuery()：执行命令对象的SQL语句，返回一个int类型变量，如果SQL语句是 .... ExecuteScalar();//注意Object类型需强制转换为int 1., There are some issues with your code/question. Your code is vulnerable to SQL Injection attacks. You need to parameterize your queries., TextBox2 .Text +"'"; SqlCommand cmd = new SqlCommand(sql,b); int state = Convert.ToInt32(cmd.ExecuteScalar()); if (state == 0) Response., The difference between the three performance wise is negligible. The bottleneck is moving the data from the DB to your app, not a trivial cast or ..., AddWithValue("@PersonID", personid); try con.Open(); addressID = (int)cmd.ExecuteScalar(); } catch (Exception ex) MessageBox.Show(ex.,下列範例會建立SqlCommand，然後執行它使用ExecuteScalar。 ... static public int AddProductCategory(string newName, string connString) Int32 newProdID = 0 ...
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 executescalar int 相關參考資料
C# ExecuteScalar()方法- DEV HOME - CSDN博客
ExecuteScalar方法返回的类型是object类型，这个方法返回sql语句执行后 ... 有可能是int，有可能是char等等），所以ExecuteScalar方法返回一个最 ... https://blog.csdn.net Cast to int on SqlCommand-ExecuteScalar error handling - Stack ...
Just change the code as: int countDis = Convert.ToInt32(cmd.ExecuteScalar());. This will ensure that even if ExecuteScalar returns null , as ... https://stackoverflow.com ExecuteScalar 返回值- Haibing的博客- CSDN博客
（1）ExecuteNonQuery()：执行命令对象的SQL语句，返回一个int类型变量，如果SQL语句是 .... ExecuteScalar();//注意Object类型需强制转换为int 1. https://blog.csdn.net How do I convert the result of ExecuteScalar() to int? - Stack ...
There are some issues with your code/question. Your code is vulnerable to SQL Injection attacks. You need to parameterize your queries. https://stackoverflow.com int state = Convert.ToInt32(cmd.ExecuteScalar());语法错误-CSDN论坛
TextBox2 .Text +"'"; SqlCommand cmd = new SqlCommand(sql,b); int state = Convert.ToInt32(cmd.ExecuteScalar()); if (state == 0) Response. https://bbs.csdn.net Int32.TryParse() or (int?)command.ExecuteScalar() - Stack Overflow
The difference between the three performance wise is negligible. The bottleneck is moving the data from the DB to your app, not a trivial cast or ... https://stackoverflow.com SQL executescalar() - MSDN - Microsoft
AddWithValue("@PersonID", personid); try con.Open(); addressID = (int)cmd.ExecuteScalar(); } catch (Exception ex) MessageBox.Show(ex. https://social.msdn.microsoft. SqlCommand. ExecuteScalar 方法 - Microsoft Docs
下列範例會建立SqlCommand，然後執行它使用ExecuteScalar。 ... static public int AddProductCategory(string newName, string connString) Int32 newProdID = 0 ... https://docs.microsoft.com |