// btn_help
//
this.btn_help.forecolor = system.drawing.systemcolors.activecaptiontext;
this.btn_help.location = new system.drawing.point(360, 280);
this.btn_help.name = "btn_help";
this.btn_help.size = new system.drawing.size(88, 24);
this.btn_help.tabindex = 3;
this.btn_help.text = "帮 助(&h)";
this.btn_help.click += new system.eventhandler(this.btn_help_click);
//
// label5
//
this.label5.backcolor = system.drawing.color.olive;
this.label5.borderstyle = system.windows.forms.borderstyle.fixedsingle;
this.label5.forecolor = system.drawing.systemcolors.activecaptiontext;
this.label5.location = new system.drawing.point(48, 192);
this.label5.name = "label5";
this.label5.size = new system.drawing.size(152, 24);
this.label5.tabindex = 1;
this.label5.text = "市场价格：";
this.label5.textalign = system.drawing.contentalignment.middlecenter;
//
// txt_bookstock
//
this.txt_bookstock.borderstyle = system.windows.forms.borderstyle.fixedsingle;
this.txt_bookstock.location = new system.drawing.point(232, 240);
this.txt_bookstock.name = "txt_bookstock";
this.txt_bookstock.size = new system.drawing.size(216, 21);
this.txt_bookstock.tabindex = 2;
this.txt_bookstock.text = "";
//
// dataedit
//
this.autoscalebasesize = new system.drawing.size(6, 14);
this.autoscroll = true;
this.backcolor = system.drawing.color.olive;
this.clientsize = new system.drawing.size(536, 389);
this.controls.addrange(new system.windows.forms.control[] {
this.statusbar,
this.btn_help,
this.txt_bookid,
this.label2,
this.label1,
this.label3,
this.label4,
this.label5,
this.label6,
this.txt_bookname,
this.txt_authorname,
this.txt_bookprice,
this.txt_bookstock,
this.btn_delete,
this.btn_update,
this.btn_movenext,
this.btn_movefirst,
this.btn_moveprevious,
this.btn_movelast});
this.name = "dataedit";
this.startposition = system.windows.forms.formstartposition.centerscreen;
this.text = "dataedit";
this.windowstate = system.windows.forms.formwindowstate.maximized;
this.resumelayout(false);
}
#endregion
private void moveprevious()
{
if (mybind.position == 0)
{
statusbar.text = "数据已经到头";
}
else
{
mybind.position -= 1;
statusbar.text = "当前位置：" +mybind.position.tostring();
}
}
private void movefirst()
{
mybind.position = 0;
statusbar.text = "当前位置：" +mybind.position.tostring();
}
private void movenext()
{
if (mybind.position == mybind.count-1)
{
statusbar.text = "数据已经到尾";
}
else
{
mybind.position += 1;
statusbar.text = "当前位置：" +mybind.position.tostring();
}
}
private void movelast()
{
mybind.position = mybind.count-1;
statusbar.text = "当前位置：" +mybind.position.tostring();
}
private void btn_movefirst_click(object sender, system.eventargs e)
{
movefirst();
}
private void btn_moveprevious_click(object sender, system.eventargs e)
{
moveprevious();
}
private void btn_movenext_click(object sender, system.eventargs e)
{
movenext();
}
private void btn_movelast_click(object sender, system.eventargs e)
{
movelast();
}
private void btn_help_click(object sender, system.eventargs e)
{
messagebox.show("数据库操作练习——定位、更新、删除",system.datetime.now.toshortdatestring());
}
private void btn_delete_click(object sender, system.eventargs e)
{
try
{
string strconn = "provider=microsoft.jet.oledb.4.0;data source=book.mdb";
oledbconnection conn = new oledbconnection(strconn);
conn.open();
string strdelete = "select * from bookstock";
oledbdataadapter adapter = new oledbdataadapter(strdelete,conn);
mydataset.tables["bookstock"].rows[mybind.position].delete();
adapter.update(mydataset,"bookstock");
statusbar.text = "记录已经删除";
conn.close();
}
catch(exception ed)
{
statusbar.text = "发生错误，原因：" + ed.message;
messagebox.show(ed.tostring());
}
}
private void btn_update_click(object sender, system.eventargs e)
{
try
{
string strconn = "provider=microsoft.jet.oledb.4.0;data source=book.mdb";
oledbconnection conn = new oledbconnection(strconn);
conn.open();
string strupdt = "update bookstock set booktitle = '"
+ txt_bookname.text + "',bookauthor = '"
+ txt_authorname.text + "',bookprice = "
+ txt_bookprice.text +",bookstock = "
+ txt_bookstock.text +" where bookid = " + txt_bookid.text;
oledbcommand comm = new oledbcommand(strupdt,conn);
comm.executenonquery();
statusbar.text = "更新成功!";
conn.close();
mydataset = null;
mybind = null;
if(isbound)
{
txt_bookid.databindings.clear();
txt_bookname.databindings.clear();
txt_authorname.databindings.clear();
txt_bookprice.databindings.clear();
txt_bookstock.databindings.clear();
isbound = false;
}
getconnected();
}
catch(exception eu)
{
statusbar.text = "发生错误，原因：" + eu.message;
}
}
}
}
