有个float类型的值，在写入数据库的时候，oledbtype应该选哪种呢？是VarNumeric还是numeric呢？

dahai99007 2008-08-26 09:41:48

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切换为时间正序

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lijin84100 2008-08-26

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System.Data.OleDb.OleDbType.Decimal

ericzhangbo1982111 2008-08-26

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OleDbType.Double=SqlDbType.Float

用ASP.NET做的 using System; using System.Data; using System.Configuration; 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 System.Data.OleDb; ///

/// Class1 的摘要说明 ///

public class Class1 { private OleDbConnection m_Connection; private String m_brChar = "\n"; public Class1() { // // TODO: 在此处添加构造函数逻辑 // } private void ExecuteCommand(OleDbCommand cmd) { cmd.Connection=m_Connection; try { m_Connection.Open(); cmd.ExecuteNonQuery(); } finally { m_Connection.Close(); } } public DataSet GetNotes(DateTime fromDate, DateTime toDate) { DataSet ds=new DataSet(); OleDbDataAdapter da=new OleDbDataAdapter("select * from Notes where DateTime BETWEEN ? and ? ORDER BY DateTime DESC",m_Connection); da.SelectCommand.Parameters.Add("FromDate", OleDbType.Date).Value = fromDate.AddDays(1); m_Connection.Open(); da.Fill(ds,"MyNotes"); m_Connection.Close(); return ds; } public void InsertNote(string title,string contents) { OleDbCommand cmd =new OleDbCommand ("insert into Notes(Title,Contents) values(?,?)"); cmd.Parameters .Add ("Title",OleDbType .VarChar ).Value =title ; cmd.Parameters .Add ("Contents",OleDbType .LongVarChar ).Value =contents.Replace (m_brChar ,"
"); ExecuteCommand (cmd); } public void InsertComment(int noteid,string author,string email,string comment) { OleDbCommand cmd=new OleDbCommand ("insert into Comments(NoteID,Author,Email,Comment) values(?,?,?,?)"); cmd.Parameters .Add ("NoteID",OleDbType .VarChar ).Value =noteid; cmd.Parameters .Add ("Author",OleDbType .VarChar ).Value =author ; cmd.Parameters .Add ("Email",OleDbType .VarChar ).Value =email ; cmd.Parameters .Add ("Comment",OleDbType .LongVarChar ).Value =comment.Replace (m_brChar ,"
"); ExecuteCommand (cmd); } public void UpdaeNote(int noteid, string title, string contents) { OleDbCommand cmd = new OleDbCommand("UPDATE [Notes] SET [Title]=?,[Contents]=? WHERE [NoteID]=?"); cmd.Parameters.Add("Title", OleDbType.VarChar).Value = title; cmd.Parameters.Add("Contents", OleDbType.LongVarChar).Value = contents.Replace(m_brChar, "
"); cmd.Parameters.Add("NoteID", OleDbType.Integer).Value = noteid; ExecuteCommand(cmd); } public void UpdateComment(int commentid,string author,string email,string comment) { OleDbCommand cmd =new OleDbCommand ("UPDATE Comments SET Author =?,Email=?,Comment=? WHERE CommentID=?"); cmd.Parameters .Add ("Author",OleDbType .VarChar ).Value =author; cmd.Parameters .Add ("Comment",OleDbType .LongVarChar).Value =comment.Replace (m_brChar ,"
"); cmd.Parameters.Add("Email", OleDbType.VarChar).Value = email; cmd.Parameters.Add("CommentID", OleDbType.VarChar).Value = commentid; ExecuteCommand(cmd); } public void DeleteNote(int noteid) { OleDbCommand cmd =new OleDbCommand ("delete from Notes where NoteID="+noteid); ExecuteCommand(cmd); } public void DeleteComment(int commentid) { OleDbCommand cmd =new OleDbCommand ("delete from Comments where CommentID="+commentid); ExecuteCommand (cmd); } public void GetNoteData(int noteid,ref string title,ref string contents,ref string post_time) { OleDbCommand cmd=new OleDbCommand ("select * from Notes where NoteID="+ noteid ,m_Connection ); try { m_Connection .Open(); OleDbDataReader reader=cmd.ExecuteReader (CommandBehavior .CloseConnection ); if(reader .Read ()) { title =reader ["Title"].ToString (); contents =reader ["Contents"].ToString ().Replace ("
",m_brChar ); post_time =reader ["DataTime"].ToString (); reader .Close (); } } finally { m_Connection .Close (); } } public void GetCommentData(int commentid,ref string author,ref string email,ref string comment) { OleDbCommand cmd=new OleDbCommand ("select * from Comments where CommentID="+commentid ,m_Connection ); try { m_Connection .Open (); OleDbDataReader reader=cmd.ExecuteReader (CommandBehavior .CloseConnection ); if(reader.Read ()) { author =reader ["Author"].ToString (); email =reader ["Comment"].ToString ().Replace ("
",m_brChar ); reader .Close (); } } finally { m_Connection .Close (); } } } ///

/// data 的摘要说明 ///

C#编程登陆界面代码 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Data.OleDb; namespace 人事管理系统 { public partial class FormLogin : Form { public FormLogin() { InitializeComponent(); } private void FormLogin_Load(object sender, EventArgs e) { } public void buttonLogin_Click_1(object sender, EventArgs e) { try { if (textBoxName .Text =="") { MessageBox.Show ("用户名不能为空!","提示",MessageBoxButtons.OKCancel,MessageBoxIcon.Warning ); } else { if (textBoxPassword .Text =="") { MessageBox.Show("密码不能为空!", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning); } else { String connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\人事数据库.mdb"; OleDbConnection conn = new OleDbConnection(connStr); //String sql = "select count(*) from 用户密码表 where username='" + textBoxName.Text + "' and password='" + textBoxPassword.Text + "'"; conn.Open(); string sql = "select count(*) from 用户密码表 where username=@name and password=@pass"; OleDbCommand cmd = new OleDbCommand(sql ,conn ); cmd.Parameters.Add(new OleDbParameter ("@name",OleDbType .Char )); cmd.Parameters["@name"].Value = textBoxName.Text; cmd.Parameters.Add(new OleDbParameter("@pass", OleDbType.Char)); cmd.Parameters["@pass"].Value = textBoxPassword.Text; //OleDbDataAdapter da = new OleDbDataAdapter(sql, conn); //DataTable dt = new DataTable(); //da.Fill(dt); //int i = dt.Rows.Count; int i =(int )cmd.ExecuteScalar (); conn.Close(); if (i > 0) { FormMain fm = new FormMain(); fm.admintime = DateTime.Now.ToShortDateString(); fm.adminname = textBoxName.Text; fm.Show(); this.Hide (); } else { MessageBox.Show("用户名或密码错误！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Error ); { textBoxName.Text = ""; textBoxPassword.Text = ""; textBoxName.Focus(); } } } } } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } private void button1_Click(object sender, EventArgs e) { if (MessageBox.Show("您确定要退出本系统吗？", "警告", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning) == DialogResult.OK) { Application.Exit(); } } private void textBoxName_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { textBoxPassword.Focus(); e.Handled = true; } } private void textBoxPassword_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { buttonLogin.Focus(); e.Handled = true; } } private void linkLabeladd_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) { Form添加 fpty = new Form添加(); fpty.Show(); } private void linkLabelpass_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) { Formpasswordmodify fpmd = new Formpasswordmodify(); fpmd.Show(); } } }

访问类型名称 数据库数据类型 OLEDB 类型 .NET 框架类型成员名称文本 VarWChar DBTYPE _ WSTR System.String OleDbType.VarWChar 备忘录 LongVarWCha R DBTYPE _ WSTR System.String OleDbType.LongVarWC...

访问类型名称数据库数据类型OLEDB 类型.NET 框架类型成员名称文本VarWCharDBTYPE _ WSTRSystem.StringOleDbType.VarWChar备忘录LongVarWCha RDBTYPE _ WSTRSystem.StringOleDbType.LongVarWChar字节数:UnsignedTinyIntDBTYPE _ UI 1System.ByteOleDbType.UnsignedTinyInt是 / 否BooleanDBTYPE_BOOLSystem.Boolea

图片与文字二进制写入数据库

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