计算 if 语句中的值

Question

sorgu.CommandText = "select count(*) from mert";

我想在 if 语句中使用来计算该查询中的值。我想获得这个价值。我怎样才能做到这一点？

代码：

OracleConnection conn = new OracleConnection(@"DATA SOURCE=;USER ID=orcl2; Password=123");
conn.Open();
OracleCommand sorgu = new OracleCommand();
sorgu.CommandText = "select * from mert";
sorgu.Connection = conn;
OracleDataReader oku = sorgu.ExecuteReader();
while (oku.Read())
{
    if (oku[0].ToString() == textBox1.Text && oku[1].ToString() == textBox2.Text)
    {
        Form2 f = new Form2();
        f.ShowDialog();
    }
}
oku.Close();

Answer 1

我以前从未使用过 Oracle 数据库，但根据 MSDN，这就是您与数据交互的方式：

  command.CommandText = "SELECT * FROM OracleTypesTable";
  OracleDataReader reader = command.ExecuteReader();
  reader.Read();
  //Using the Oracle specific getters for each type is faster than
  //using GetOracleValue.
  //First column, MyVarchar2, is a VARCHAR2 data type in Oracle Server
  //and maps to OracleString.
  OracleString oraclestring1 = reader.GetOracleString(0);
  Console.WriteLine("OracleString " + oraclestring1.ToString());

  //Second column, MyNumber, is a NUMBER data type in Oracle Server
  //and maps to OracleNumber.
  OracleNumber oraclenumber1 = reader.GetOracleNumber(1);
  Console.WriteLine("OracleNumber " + oraclenumber1.ToString());

因此，对于每一列，您必须设置一个

OracleString

、

OracleNumber

、

OracleDateTime

、

OracleBinary

等。相应的函数（例如

GetOracleString(col)

）就是您实际检索数据的方式。