数据库操作类的封装

public static string conString = @"Server=localhost;Integrated Security=True; Database=northwind";
1. 执行Sql语句, 返回受影响的行数

Code
//执行一条计算查询结果语句,返回查询结果(object)
public static object GetSingle(string strSql)
{
SqlConnection thisConnection = new SqlConnection(conString);
SqlCommand thisCommand = new SqlCommand(strSql, thisConnection);
thisConnection.Open();
object obj = thisCommand.ExecuteScalar();
if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}调用方法:
string strSql = @"select * from Customers";
string num = Utility.GetSingle(strSql).ToString();
5. 带参数, 执行SQL语句, 返回影响的记录数
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