ADO.NET中DataSet的使用

1.读取：

在web.config添加：

<connectionStrings>

<add name="carConnectionString" connectionString="Data Source=JY-LANBJ;Initial Catalog=car;Persist Security Info=True;User ID=root;Password=root" providerName="System.Data.SqlClient"/>

</connectionStrings>

在**.aspx.cs页面的Page_Load方法中添加：

SqlConnection con = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["carConnectionString"].ToString());

{

string cmd1 = "select * from carworkers";

SqlDataAdapter da = new SqlDataAdapter(cmd1, con);

DataSet ds = new DataSet();//创建数据集

da.Fill(ds);//填充数据集

DataTable dt = ds.Tables[0];

for (int i = 0; i < dt.Rows.Count;i++ )

{

Response.Write(dt.Rows[i]["power"].ToString() + "<BR>");

}

}

注意先添加以下命名空间：

using System.Data.SqlClient;

using System.Data;

using System.Configuration;

---------------------------------------------------------------------------------------------------------------------------------

2.插入：

在**.aspx.cs页面的Page_Load方法中添加：

SqlConnection con = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["carConnectionString"].ToString());

{

string cmd1 = "select * from carworkers";

SqlDataAdapter da = new SqlDataAdapter(cmd1, con);

SqlCommandBuilder cb = new SqlCommandBuilder(da); //为Adapter创建builder实例，才可以进行插入、修改、更新

DataSet ds = new DataSet();//创建数据集

da.Fill(ds);//填充数据集

DataTable dt = ds.Tables[0];

DataRow newRow = dt.NewRow();

newRow["username"] = "Jolin";

newRow["power"] = 0;

newRow["id"] = 99;

dt.Rows.Add(newRow);

da.Update(ds);

for (int i = 0; i < dt.Rows.Count;i++ )

{

Response.Write(dt.Rows[i]["power"].ToString() + "<BR>");

}

}

---------------------------------------------------------------------------------------------------------------------------------

3.删除

在**.aspx.cs页面的Page_Load方法中添加：

SqlConnection con = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["carConnectionString"].ToString());

{

string cmd1 = "select * from works where wid='" + did+"'";

SqlDataAdapter da = new SqlDataAdapter(cmd1, con);

SqlCommandBuilder cb = new SqlCommandBuilder(da); //为Adapter创建builder实例，才可以进行插入、修改、更新

con.Open();

DataSet dss = new DataSet();//创建数据集

da.Fill(dss);//填充数据集

DataTable dt = dss.Tables[0];

dt.Rows[0].Delete();

da.Update(dss);

con.Close();

Response.Write("<script LANGUAGE='javascript'>location.href ='default.aspx?username="+username+"';</script>");

}