C# 当新值是局部变量时，SQL更新的语法是什么

在C#Windows程序中，我想更新SQL Server表中的Int字段

int NewSeqno = MySeqno;    // get current sequence number

NewSeqno++;     // increment it

connection.Open();

// The following errors out saying that NewSeqno is not a column in the table.

// I want to update the field with the local variable NewSeqno.

command.CommandText = "UPDATE dbo.params SET NextSeqno = NewSeqno";

int recordsAffected = command.ExecuteNonQuery();

// The following statement, which writes a constant in the field, works fine.
command.CommandText = "UPDATE dbo.params SET NextSeqno = 123";

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必须将参数传递给SQL查询

更新命令文本，如下所示-

command.CommandText = "UPDATE dbo.params SET NextSeqno = @NewSeqno";

将此行添加到pass参数

command.Parameters.Add("@NewSeqno", SqlDbType.Int).Value = NewSeqno;

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你应该学会如何去做和做。例如，指向MSDN的链接有一个更新声明。同意，更新了我的答案。