选择命令参数C#
我需要获取SelectCommand.Parameters的值 你能帮我吗选择命令参数C#,c#,asp.net,c#-4.0,C#,Asp.net,C# 4.0,我需要获取SelectCommand.Parameters的值 你能帮我吗 string sql = "SELECT area, login, senha FROM tbl_usuarios WHERE login = '" + login + "' AND senha = '" + senha + "'"; adapter = new SqlDataAdapter(sql, conn); dataTable = new DataTable(); adapter.SelectCommand.P
string sql = "SELECT area, login, senha FROM tbl_usuarios WHERE login = '" + login + "' AND senha = '" + senha + "'";
adapter = new SqlDataAdapter(sql, conn);
dataTable = new DataTable();
adapter.SelectCommand.Parameters.Add("login", DbType.String);
adapter.SelectCommand.Parameters.Add("senha", DbType.String);
string a = adapter.SelectCommand.Parameters.Add(@"area", DbType.Int16); // Error Coversion
Session.Add("ar", a);
我认为问题在于您试图将Add方法(它是一个SqlParameter)的返回类型分配给字符串 看 我想你要找的是
SqlParameter a = adapter.SelectCommand.Parameters.Add(@"area", DbType.Int16);
SqlParameter a = adapter.SelectCommand.Parameters.Add(@"area", DbType.Int16);
检查MSDN上的代码: 也许你需要的是: 获取数据表上的值:
string sql = "SELECT area, login, senha FROM tbl_usuarios WHERE login = '" + login + "' AND senha = '" + senha + "'";
adapter = new SqlDataAdapter(sql, conn);
dataTable = new DataTable();
adapter.Fill(dataTable);
string a = dataTable.Rows["area"].toString(); //get area value..
Session.Add("ar", a);
关于您的问题不清楚,但是Add方法返回一种类型的SqlParameter,因此:
string a = adapter.SelectCommand.Parameters.Add(@"area", DbType.Int16);
他错了。。它需要:
bool encontrou = false;
string sql = "SELECT area, login, senha FROM tbl_usuarios WHERE login = '" + login + "' AND senha = '" + senha + "'";
command = new SqlCommand(sql, conn);
try
{
conn.Open();
dataReader = command.ExecuteReader();
while(dataReader.Read())
{
string area = dataReader["area"].ToString();
Session.Add("area", area);
encontrou = true;
}
}