解决一下这个问题
我修改了学生的基本信息，想要在单击“修改”按钮的时候，把修改的内容写到ACCESS的数据库里去，请问该语句怎么写。新手上手，请多指教 --------------------编程问答-------------------- 这种问题~~~~~~~
期待好心人直接给代码吧 --------------------编程问答-------------------- http://www.shehui001.com/StudyWeb/CSharp/htm/200989/129.htm
--------------------编程问答--------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Data.OleDb;
using System.Data;
using System.IO;
namespace Core.DBUtility
{
public class AccessClient
{
static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["Conn"].ConnectionString;
public AccessClient()
{
}
public AccessClient(string path)
{
connectionString = "Provider=Microsoft.Jet.OleDb.4.0;Data Source=" + path + @"\db.mdb";
}
/// <summary>
/// 执行SQL语句，返回受影响的行数
/// </summary>
/// <param name="cmdText">SQL语句</param>
/// <returns>受影响的行数</returns>
public static int ExecuteNonQuery(string cmdText)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
PrepareCommand(cmd, conn, CommandType.Text, cmdText, null);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val > 0 ? val : 0;
}
}
/// <summary>
/// 执行SQL语句，返回OleDbDataReader
/// </summary>
/// <param name="cmdText">SQL语句</param>
/// <returns>OleDbDataReader对象</returns>
public static OleDbDataReader ExecuteReader(string cmdText)
{
OleDbCommand cmd = new OleDbCommand();
OleDbConnection conn = new OleDbConnection(connectionString);
try
{
PrepareCommand(cmd, conn, CommandType.Text, cmdText, null);
OleDbDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}
/// <summary>
/// 执行SQL语句，返回结果集第一行第一列
/// </summary>
/// <param name="cmdText">SQL语句</param>
/// <returns>结果集第一行第一列</returns>
public static object ExecuteScalar(string cmdText)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
PrepareCommand(cmd, conn, CommandType.Text, cmdText, null);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
/// 执行SQL语句，返回DataTable
/// </summary>
/// <param name="cmdText">SQL语句</param>
/// <returns>DataTable</returns>
public static DataTable ExecuteDataTable(string cmdText)
{
OleDbCommand comm = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
PrepareCommand(comm, conn, CommandType.Text, cmdText, null);
OleDbDataAdapter adapter = new OleDbDataAdapter(comm);
DataSet ds = new DataSet();
adapter.Fill(ds, "temp");
return ds.Tables["temp"];
}
}
#region ExecuteSQL Method
public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
PrepareCommand(cmd, conn, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
public static OleDbDataReader ExecuteReader(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand cmd = new OleDbCommand();
OleDbConnection conn = new OleDbConnection(connectionString);
try
{
PrepareCommand(cmd, conn, cmdType, cmdText, commandParameters);
OleDbDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}
public static object ExecuteScalar(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
PrepareCommand(cmd, connection, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
public static DataTable ExecuteDataTable(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand comm = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
PrepareCommand(comm, conn, cmdType, cmdText, commandParameters);
OleDbDataAdapter adapter = new OleDbDataAdapter(comm);
DataSet ds = new DataSet();
adapter.Fill(ds, "temp");
return ds.Tables["temp"];
}
}
private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, CommandType cmdType, string cmdText,OleDbParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (OleDbParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
}
}
UPDATE TABLENAME SET FIELDNAME=@FIELDNAMEVALUE WHEREEXPRESS--------------------编程问答--------------------
update 语句！ --------------------编程问答-------------------- 。。。。
。。。。 --------------------编程问答-------------------- 有点难度 ， 看不出来
--------------------编程问答--------------------
--------------------编程问答--------------------
楼主连最今本的语句都不知道，还不去看书？别人给你的代码估计也很难看明白。
--------------------编程问答--------------------
using System;using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using DataSetManagerTableAdapters;
using System.Data.SqlClient;
public partial class modifystu : System.Web.UI.Page
{
UsersTableAdapter userAdapter = new UsersTableAdapter();
DepartmentTableAdapter departAdapter = new DepartmentTableAdapter();
ClassTableAdapter classAdapter = new ClassTableAdapter();
SpecialTableAdapter specAdapter = new SpecialTableAdapter();
DataSetManager.DepartmentDataTable departTable = new DataSetManager.DepartmentDataTable();
DataSetManager.ClassDataTable classTable = new DataSetManager.ClassDataTable();
DataSetManager.SpecialDataTable speciTable = new DataSetManager.SpecialDataTable();
protected void Page_Load(object sender, EventArgs e)
{
try
{
if (Session["level"] == null || Convert.ToInt32(Session["level"].ToString()) < 2)
{
Response.Redirect("login.aspx");
}
}
catch (Exception ex)
{
Response.Redirect("login.aspx");
}
}
protected void btnCancel_Click(object sender, EventArgs e)
{
txtEmail.Text = "";
txtName.Text = "";
txtRoomNum.Text = "";
txtStuId.Text = "";
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
if (this.txtStuId.Text.Trim() == "")
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "<script>window.alert('不存在该学生！')</script>");
return;
}
else
{
int departNum = Convert.ToInt32(ddlDepart.SelectedItem.Value);
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Server=(local);uid=sa;pwd=;database=m_manager.mdb;";
conn.Open();
string sql = "insert into Users(room,email)values('" + this.txtRoomNum.Text + "','" + this.txtEmail.Text + "')where user_stuid='" + this.txtStuId.Text + "'";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlCommand command = new SqlCommand();
int flag = cmd.ExecuteNonQuery();
if (flag == 0)
{
this.TextBox1.Text = "修改失败！";
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "<script>window.alert('操作成功！')</script>");
}
}
}
catch (Exception ex)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "<script>window.alert('操作失败！')</script>");
}
}
}
运行的时候总是显示操作失败!!!
没有将修改后的数据添加到数据库？？
怎么修正？
请多指教 --------------------编程问答-------------------- 2楼已经够详细了
补充：.NET技术 , C#
