Question

我有错误，我想做一个过滤器，它包含一些组合框和日期时间选择器，它将在dategridview中显示。当我想从datebase中选择日期时，我有这个错误：

“条件表达式中的数据类型不匹配”。

string strSql1 = @"Select * from GGG where 
                   device_id LIKE '%" + metroComboBox1.Text + "%' 
                   AND parameter_id LIKE '%" + metroComboBox3.Text + "%' 
                   AND time_id Between 'date1' AND 'date2'";`

string constr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\Ирина\\Desktop\\Visual Studio 2013\\Projects\\WindowsFormsApplication1\\WindowsFormsApplication1\\BD3.accdb;Persist Security Info=False";

string date1 = metroDateTime1.Value.ToString("MM/dd/yyyy H:mm:ss", CultureInfo.InvariantCulture).Replace('.', '/');
string date2 = metroDateTime3.Value.ToString("MM/dd/yyyy H:mm:ss", CultureInfo.InvariantCulture).Replace('.', '/');

//string strSql = ("SELECT * FROM GGG where device_id LIKE '%" + metroComboBox1.Text + "%' AND parameter_id LIKE '%" + metroComboBox3.Text + "%' ");
string strSql1 = "Select * from table1 where device_id LIKE '%" + metroComboBox1.Text + "%' AND parameter_id LIKE '%" + metroComboBox3.Text + "%' AND time_id Between 'date1' AND 'date2'";

//string strSql = "SELECT event_id, device_id, parameter_id, parameter_int_id, time_id, user_id FROM table1 where time_id between #" + metroDateTime1.Value.ToString("yyyy'/'MM'/'dd") + "# AND #" + metroDateTime3.Value.ToString("yyyy'/'MM'/'dd") + "" "# AND #" device_id LIKE '%" + comboBox2.Text + "%' "# AND #" parameter_id LIKE '%" + comboBox3.Text + "%' ");
//string strSql = "SELECT event_id, device_id, parameter_id, date_id, time_id, user_id FROM GGG where device_id like '%" + metroComboBox1.Text + "%' AND parameter_id LIKE '%" + metroComboBox3.Text + "%' ";



OleDbConnection con = new OleDbConnection(constr);
OleDbCommand cmd = new OleDbCommand(strSql1, con);
con.Open();
cmd.CommandType = CommandType.Text;
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataTable GGG = new DataTable();
da.Fill(GGG);
metroGrid1.DataSource = GGG;
con.Close();

Answer 1

string strSql1 =

更好：

 performSelect(metroComboBox1.Text, metroComboBox3.Text, date1, date2);
private void performSelect(string param1, string param2, DateTime Date1,DateTime Date2){ 
using(OleDbCommand com = Conn.CreateCommand()){
   com.CommandText = "select * from GGG where device like %@mcb1% and parameter like %@mcb3% and time between @date1 and @date2";
   com.Parameters.AddWithValue("@mcb1",param1);
   com.Parameters.AddWithValue("@mcb3",param2);
   com.Parameters.AddWithValue("@date1",Date1);
   com.Parameters.AddWithValue("@date2",Date2);
   com.ExecuteReader();
} 
}

如果这不起作用，那么请告诉我们param1，param2，date1和date2在进入方法时的值。＆＃34;从GGG中选择*，其中device_id LIKE＆＃39;％＆＃34; + metroComboBox1.Text +＆＃34;％＆＃39; AND parameter_id LIKE＆＃39;％＆＃34; + metroComboBox3.Text +＆＃34;％＆＃39; AND time_id在＃＆＃34; + date1 +＆＃34;＃AND＃＆＃34; + date2 +＆＃34;＃＆＃34;;

之间

"Select * from GGG where device_id LIKE '%" + metroComboBox1.Text + "%' AND parameter_id LIKE '%" + metroComboBox3.Text + "%' AND time_id Between #"+date1+"# AND #"+date2+"# AND clock_id between #"+date3+"# and #"+date4+"#"

MS访问标准表达式c＃中的数据类型不匹配

1 个答案: