DataSet技术 DataTable DataView
//*****************************************************************************/
// 在数据库vls 中有个 PROVINCE表 其中字段有 PROVINCE_ID/ PROVINCE_CDE/ PROVINCE_NAME ××包含中国34省,市,自治区
//*****************************************************************************/
From 与ASP.NET 用法一样
1.绑定DataGird
string constr="user id=sa;password=168168;initial catalog=VLS;data source=yu;Connect Timeout=30";
SqlConnection mycon=new SqlConnection(constr);
string sqlstr="select * from PROVINCE";
SqlDataAdapter dap=new SqlDataAdapter(sqlstr,mycon);
// 也可以用下面3句 调用 SqlCommand组件
//SqlCommand mycomd=new SqlCommand(sqlstr,mycon);
//SqlDataAdapter dap=new SqlDataAdapter();
//dap.SelectCommand=mycomd;
mycon.Open();
DataSet ds=new DataSet();
dap.Fill(ds,"PROVINCE");
mycon.Close();
this.DataGrid1.DataSource=ds.Tables[0].DefaultView;
this.DataGrid1.DataBind();
2.增加
string constr="user id=sa;password=168168;initial catalog=VLS;data source=yu;Connect Timeout=30";
SqlConnection mycon=new SqlConnection(constr);
string sqlstr="select * from PROVINCE";
SqlCommand mycomd=new SqlCommand(sqlstr,mycon);
mycon.Open();
SqlDataAdapter myAdapter=new SqlDataAdapter();
myAdapter.SelectCommand=mycomd;
DataSet ds=new DataSet();
myAdapter.Fill(ds,"PROVINCE");
//增加
for(int i=0;i<34;i++)
{
DataRow drw=ds.Tables[0].NewRow();
drw["PROVINCE_ID"]="temp"+Convert.ToString(i);
drw["PROVINCE_NAME"]="你好们";
ds.Tables[0].Rows.Add(drw);
}
SqlCommandBuilder myCommandBuilder = new SqlCommandBuilder(myAdapter);
myAdapter.Update(ds,"PROVINCE");
ds.Tables[0].AcceptChanges();
mycon.Close();
3.删除 修改 //****************删除 修改记录的 表一定要有主键
string constr="user id=sa;password=168168;initial catalog=VLS;data source=yu;Connect Timeout=30";
SqlConnection mycon=new SqlConnection(constr);
string sqlstr="select * from PROVINCE";
SqlCommand mycomd=new SqlCommand(sqlstr,mycon);
mycon.Open();
SqlDataAdapter myAdapter=new SqlDataAdapter();
myAdapter.SelectCommand=mycomd;
DataSet ds=new DataSet();
myAdapter.Fill(ds,"PROVINCE");
DataRow []drws=ds.Tables[0].Select("PROVINCE_ID like 'temp%'");
//删除
foreach(DataRow drw in drws)
{
Response.Write(drw["PROVINCE_NAME"].ToString()+" ");
drw.Delete();
}
//修改
foreach(DataRow drw in ds.Tables[0].Rows)
{
Response.Write(drw["PROVINCE_NAME"].ToString()+" ");
drw["PROVINCE_CDE"]="M2";
}
SqlCommandBuilder myCommandBuilder = new SqlCommandBuilder(myAdapter);
myAdapter.Update(ds,ds.Tables[0].TableName);
ds.Tables[0].AcceptChanges();
mycon.Close();
DataTable
1.新建表绑定
DataTable dt=new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(Int32)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++)
{
dr=dt.NewRow();
dr[0]=i;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr);
}
this.DataGrid1.DataSource=dt.DefaultView;
this.DataGrid1.DataBind();
2.//DataTable 经常用到的 select属性 用来 判断重复
DataTable dt=new DataTable();DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(string)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++)
{
dr=dt.NewRow();
dr[0]="ff"+i.ToString();;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr);
}
string str="id='ff3' and text='sds3'";
//模糊查询 //string str=" text like 's%'";
DataRow[] drws=dt.Select(str);
if(drws.Length>0)
{Response.Write("有重复记录!");}
else{Response.Write("无重复记录!");}
DataView
//DataView 就是 筛选,过滤后的DataTable
1.筛选
DataTable dt=new DataTable();DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(Int32)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++){
dr=dt.NewRow();
dr[0]=i;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr); }
dt.DefaultView.RowFilter="id=5";
this.DataGrid1.DataSource=dt.DefaultView;
this.DataGrid1.DataBind();
2.排序
DataTable dt=new DataTable();DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(Int32)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++)
{
dr=dt.NewRow();
dr[0]=i;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr);
}
dt.DefaultView.Sort="id desc";
this.DataGrid1.DataSource=dt.DefaultView;
this.DataGrid1.DataBind();
//*****************************************************************************/
// 在数据库vls 中有个 PROVINCE表 其中字段有 PROVINCE_ID/ PROVINCE_CDE/ PROVINCE_NAME ××包含中国34省,市,自治区
//*****************************************************************************/
From 与ASP.NET 用法一样
1.绑定DataGird
string constr="user id=sa;password=168168;initial catalog=VLS;data source=yu;Connect Timeout=30";
SqlConnection mycon=new SqlConnection(constr);
string sqlstr="select * from PROVINCE";
SqlDataAdapter dap=new SqlDataAdapter(sqlstr,mycon);
// 也可以用下面3句 调用 SqlCommand组件
//SqlCommand mycomd=new SqlCommand(sqlstr,mycon);
//SqlDataAdapter dap=new SqlDataAdapter();
//dap.SelectCommand=mycomd;
mycon.Open();
DataSet ds=new DataSet();
dap.Fill(ds,"PROVINCE");
mycon.Close();
this.DataGrid1.DataSource=ds.Tables[0].DefaultView;
this.DataGrid1.DataBind();
2.增加
string constr="user id=sa;password=168168;initial catalog=VLS;data source=yu;Connect Timeout=30";
SqlConnection mycon=new SqlConnection(constr);
string sqlstr="select * from PROVINCE";
SqlCommand mycomd=new SqlCommand(sqlstr,mycon);
mycon.Open();
SqlDataAdapter myAdapter=new SqlDataAdapter();
myAdapter.SelectCommand=mycomd;
DataSet ds=new DataSet();
myAdapter.Fill(ds,"PROVINCE");
//增加
for(int i=0;i<34;i++)
{
DataRow drw=ds.Tables[0].NewRow();
drw["PROVINCE_ID"]="temp"+Convert.ToString(i);
drw["PROVINCE_NAME"]="你好们";
ds.Tables[0].Rows.Add(drw);
}
SqlCommandBuilder myCommandBuilder = new SqlCommandBuilder(myAdapter);
myAdapter.Update(ds,"PROVINCE");
ds.Tables[0].AcceptChanges();
mycon.Close();
3.删除 修改 //****************删除 修改记录的 表一定要有主键
string constr="user id=sa;password=168168;initial catalog=VLS;data source=yu;Connect Timeout=30";
SqlConnection mycon=new SqlConnection(constr);
string sqlstr="select * from PROVINCE";
SqlCommand mycomd=new SqlCommand(sqlstr,mycon);
mycon.Open();
SqlDataAdapter myAdapter=new SqlDataAdapter();
myAdapter.SelectCommand=mycomd;
DataSet ds=new DataSet();
myAdapter.Fill(ds,"PROVINCE");
DataRow []drws=ds.Tables[0].Select("PROVINCE_ID like 'temp%'");
//删除
foreach(DataRow drw in drws)
{
Response.Write(drw["PROVINCE_NAME"].ToString()+" ");
drw.Delete();
}
//修改
foreach(DataRow drw in ds.Tables[0].Rows)
{
Response.Write(drw["PROVINCE_NAME"].ToString()+" ");
drw["PROVINCE_CDE"]="M2";
}
SqlCommandBuilder myCommandBuilder = new SqlCommandBuilder(myAdapter);
myAdapter.Update(ds,ds.Tables[0].TableName);
ds.Tables[0].AcceptChanges();
mycon.Close();
DataTable
1.新建表绑定
DataTable dt=new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(Int32)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++)
{
dr=dt.NewRow();
dr[0]=i;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr);
}
this.DataGrid1.DataSource=dt.DefaultView;
this.DataGrid1.DataBind();
2.//DataTable 经常用到的 select属性 用来 判断重复
DataTable dt=new DataTable();DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(string)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++)
{
dr=dt.NewRow();
dr[0]="ff"+i.ToString();;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr);
}
string str="id='ff3' and text='sds3'";
//模糊查询 //string str=" text like 's%'";
DataRow[] drws=dt.Select(str);
if(drws.Length>0)
{Response.Write("有重复记录!");}
else{Response.Write("无重复记录!");}
DataView
//DataView 就是 筛选,过滤后的DataTable
1.筛选
DataTable dt=new DataTable();DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(Int32)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++){
dr=dt.NewRow();
dr[0]=i;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr); }
dt.DefaultView.RowFilter="id=5";
this.DataGrid1.DataSource=dt.DefaultView;
this.DataGrid1.DataBind();
2.排序
DataTable dt=new DataTable();DataRow dr;
dt.Columns.Add(new DataColumn("id",typeof(Int32)));
dt.Columns.Add(new DataColumn("text",typeof(string)));
for(int i=0;i<10;i++)
{
dr=dt.NewRow();
dr[0]=i;
dr[1]="sds"+i.ToString();
dt.Rows.Add(dr);
}
dt.DefaultView.Sort="id desc";
this.DataGrid1.DataSource=dt.DefaultView;
this.DataGrid1.DataBind();