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private void button1_Click(object sender, EventArgs e) { con.Open(); string str = "select * from (select tblNewAdmission.NAID as student_ID,tblNewAdmission.fname as full_name,tblNewAdmission.mname as Monther_Name,tblNewAdmission.gender as Gender,tblNewAdmission.dob as Date_of_Birth,tblNewAdmission.mobile as Mobile,tblNewAdmission.email as Email_ID,tblNewAdmission.semester,tblNewAdmission.prog as Programing_Language,tblNewAdmission.sname as school_name,tblNewAdmission.duration as Course_duration,tblNewAdmission.addres as Address,tblfee.fee as Fees from tblNewAdmission inner join tblfee on tblNewAdmission.NAID=tblfee.NAID) where NAID = '"+textBox1.Text+"'"; SqlCommand cmd = new SqlCommand(str, con); SqlDataAdapter sda = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); sda.Fill(ds); dataGridView1.DataSource = ds.Tables[0]; //cmd.ExecuteNonQuery(); con.Close(); } above code Iam writing in the button click event for searching students Iam using the joins to get the result from the 2 tables but when iam searching specfic student from the above script inner join result, iam not geeting can you please help me with script.
我尝试过的:
string str = "select * from (select tblNewAdmission.NAID as student_ID,tblNewAdmission.fname as full_name,tblNewAdmission.mname as Monther_Name,tblNewAdmission.gender as Gender,tblNewAdmission.dob as Date_of_Birth,tblNewAdmission.mobile as Mobile,tblNewAdmission.email as Email_ID,tblNewAdmission.semester,tblNewAdmission.prog as Programing_Language,tblNewAdmission.sname as school_name,tblNewAdmission.duration as Course_duration,tblNewAdmission.addres as Address,tblfee.fee as Fees from tblNewAdmission inner join tblfee on tblNewAdmission.NAID=tblfee.NAID) where NAID = '"+textBox1.Text+"'";
解决方案1
正如戴夫指出的,您可以简化查询。 另外,您不会传递这样的参数。
尝试这个:
C#
string str = "SELECT tblNewAdmission.NAID AS student_ID, tblNewAdmission.fname AS full_name, tblNewAdmission.mname AS Monther_Name, tblNewAdmission.gender AS Gender, tblNewAdmission.dob AS Date_of_Birth, tblNewAdmission.mobile AS Mobile, tblNewAdmission.email AS Email_ID, tblNewAdmission.semester, tblNewAdmission.prog AS Programing_Language, tblNewAdmission.sname AS school_name, tblNewAdmission.duration AS Course_duration, tblNewAdmission.addres AS Address, tblfee.fee AS Fees FROM tblNewAdmission INNER JOIN tblfee ON tblNewAdmission.NAID = tblfee.NAID WHERE tblNewAdmission.NAID = @NAID"; using (SqlCommand command = new SqlCommand(str, con)) { command.Parameters.AddWithValue("@NAID", textBox1.Text); // Execute your query and process the result }
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