Question

这似乎没有任何帮助

this.con.Open();
string selectCommandText = "Select * from paymentrecord where Payment_date >= " + dateTimePicker2.Value.ToString("dd-MM-yyyy") + " and  Payment_date <" + dateTimePicker1.Value.ToString("dd-MM-yyyy") + "";
OleDbDataAdapter adapter = new     OleDbDataAdapter(selectCommandText, this.con);
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
DataTable dataTable = new DataTable();
adapter.Fill(dataTable);
this.dataGridView1.DataSource = dataTable;
this.con.Close();

这个似乎也不好用。它给了我不同日期的记录，有时我也没有得到任何记录，而他们是我选择日期的记录

this.con.Open();
        string selectCommandText = "Select * from paymentrecord where Payment_date  BETWEEN " + dateTimePicker2.Value.ToString("dd-MM-yyyy") +" and "+ dateTimePicker1.Value.ToString("dd-MM-yyyy") + "";
        OleDbDataAdapter adapter = new OleDbDataAdapter(selectCommandText, this.con);
        OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
        DataTable dataTable = new DataTable();
        adapter.Fill(dataTable);
        this.dataGridView1.DataSource = dataTable;
        this.con.Close();

Answer 1

您的查询是否给出了正确的结果？

我认为Payment_date是一个字符串。字符串比较不会给出正确的结果。它应该是DateTime。

大于或小于的运算符将比较字符串中paymentDate的值。所以它给你带来了可怕的结果。

在查询之间似乎并不顺利

1 个答案: