ADO.NET总结
SQL Server数据库连接。http://www.cnblogs.com/samwu/archive/2011/08/30/2159355.html
DataReader方式的插入数据行，删除数据行，查询数据行，更新数据行。
DataReader手工分页。http://www.cnblogs.com/samwu/archive/2011/06/16/2082313.html
DataReader和DataSet的比较。http://www.cnblogs.com/samwu/archive/2011/09/26/2191723.html
DataAdapter方式的插入数据行，删除数据行，查询数据行，更新数据行。
DataSet的基本使用。http://www.cnblogs.com/samwu/archive/2010/10/13/1850559.html
类型化DataSet。
ADO.NET使用存储过程。http://www.cnblogs.com/samwu/archive/2011/09/19/2181378.html
ADO.NET使用事务。http://www.cnblogs.com/samwu/archive/2011/08/30/2159380.html
ADO.NET连接池。http://www.cnblogs.com/waw/archive/2011/08/29/2158762.html和
http://jingyan.baidu.com/article/a3a3f811a5e2638da2eb8a02.html
SqlDataSource控件使用。
编写自己的SQLHelper类。
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DataReader方式的插入数据行 ：
View Code
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 System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立Command对象
SqlCommand sqlcommand = new SqlCommand();
sqlcommand.Connection = sqlconn;
// 把SQL语句赋给Command对象
sqlcommand.CommandText = " insert into student(no,name,sex,birth,address,photo) values (@no,@name,@sex,@birth,@address,@photo) ";
sqlcommand.Parameters.AddWithValue( " @no ",TextBox1.Text);
sqlcommand.Parameters.AddWithValue( " @name ",TextBox2.Text);
sqlcommand.Parameters.AddWithValue( " @sex ",DropDownList1.Text);
sqlcommand.Parameters.AddWithValue( " @birth ",TextBox3.Text);
sqlcommand.Parameters.AddWithValue( " @address ",TextBox4.Text);
sqlcommand.Parameters.AddWithValue( " @photo ",FileUpload1.FileName);
try
{
// 打开连接
sqlconn.Open();
// 执行SQL命令,ExecuteNonQuery();返回值是执行的影响行数
sqlcommand.ExecuteNonQuery();
// 把学生的照片上传到网站的“image”文件夹中
if (FileUpload1.HasFile == true)
{
FileUpload1.SaveAs(Server.MapPath(( " ~/image/ ") + FileUpload1.FileName));
}
Label1.Text = " 成功增加记录 ";
}
catch (Exception ex)
{
Label1.Text = " 错误原因： "+ex.Message;
}
finally
{
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
}
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 System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立Command对象
SqlCommand sqlcommand = new SqlCommand();
sqlcommand.Connection = sqlconn;
// 把SQL语句赋给Command对象
sqlcommand.CommandText = " insert into student(no,name,sex,birth,address,photo) values (@no,@name,@sex,@birth,@address,@photo) ";
sqlcommand.Parameters.AddWithValue( " @no ",TextBox1.Text);
sqlcommand.Parameters.AddWithValue( " @name ",TextBox2.Text);
sqlcommand.Parameters.AddWithValue( " @sex ",DropDownList1.Text);
sqlcommand.Parameters.AddWithValue( " @birth ",TextBox3.Text);
sqlcommand.Parameters.AddWithValue( " @address ",TextBox4.Text);
sqlcommand.Parameters.AddWithValue( " @photo ",FileUpload1.FileName);
try
{
// 打开连接
sqlconn.Open();
// 执行SQL命令,ExecuteNonQuery();返回值是执行的影响行数
sqlcommand.ExecuteNonQuery();
// 把学生的照片上传到网站的“image”文件夹中
if (FileUpload1.HasFile == true)
{
FileUpload1.SaveAs(Server.MapPath(( " ~/image/ ") + FileUpload1.FileName));
}
Label1.Text = " 成功增加记录 ";
}
catch (Exception ex)
{
Label1.Text = " 错误原因： "+ex.Message;
}
finally
{
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
}
DataReader方式的删除数据行：
View Code
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 System.Data.SqlClient;
public partial class command : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
int intDeleteCount;
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立Command对象
SqlCommand sqlcommand = new SqlCommand();
// Command对象的属性赋值
sqlcommand.Connection = sqlconn;
sqlcommand.CommandText = " delete from student where no=@no ";
sqlcommand.Parameters.AddWithValue( " @no ",TextBox1.Text);
try
{
sqlconn.Open();
intDeleteCount=sqlcommand.ExecuteNonQuery();
if (intDeleteCount> 0)
Label1.Text = " 成功删除记录 ";
else
Label1.Text = " 该记录不存在 ";
}
catch (Exception ex)
{
Label1.Text = " 错误原因： "+ex.Message;
}
finally
{
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
}
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 System.Data.SqlClient;
public partial class command : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
int intDeleteCount;
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立Command对象
SqlCommand sqlcommand = new SqlCommand();
// Command对象的属性赋值
sqlcommand.Connection = sqlconn;
sqlcommand.CommandText = " delete from student where no=@no ";
sqlcommand.Parameters.AddWithValue( " @no ",TextBox1.Text);
try
{
sqlconn.Open();
intDeleteCount=sqlcommand.ExecuteNonQuery();
if (intDeleteCount> 0)
Label1.Text = " 成功删除记录 ";
else
Label1.Text = " 该记录不存在 ";
}
catch (Exception ex)
{
Label1.Text = " 错误原因： "+ex.Message;
}
finally
{
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
}
DataReader方式的更新数据行：
View Code
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
int intUpdateCount;
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立Command对象
SqlCommand sqlcommand = new SqlCommand();
sqlcommand.Connection = sqlconn;
// 把SQL语句赋给Command对象
sqlcommand.CommandText = " update_student ";
// 说明命令类型为存储过程
sqlcommand.CommandType = CommandType.StoredProcedure;
sqlcommand.Parameters.AddWithValue( " @no ", TextBox1.Text);
sqlcommand.Parameters.AddWithValue( " @name ", TextBox2.Text);
sqlcommand.Parameters.AddWithValue( " @sex ", DropDownList1.Text);
sqlcommand.Parameters.AddWithValue( " @birth ", TextBox3.Text);
sqlcommand.Parameters.AddWithValue( " @address ", TextBox4.Text);
sqlcommand.Parameters.AddWithValue( " @photo ", FileUpload1.FileName);
try
{
// 打开连接
sqlconn.Open();
// 执行SQL命令
intUpdateCount=sqlcommand.ExecuteNonQuery();
// 把学生的照片上传到网站的“image”文件夹中
if (FileUpload1.HasFile == true)
{
FileUpload1.SaveAs(Server.MapPath(( " ~/image/ ") + FileUpload1.FileName));
}
if (intUpdateCount > 0)
Label1.Text = " 成功修改记录 ";
else
Label1.Text = " 该记录不存在 ";
}
catch (Exception ex)
{
Label1.Text = " 错误原因： " + ex.Message;
}
finally
{
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
}
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
int intUpdateCount;
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立Command对象
SqlCommand sqlcommand = new SqlCommand();
sqlcommand.Connection = sqlconn;
// 把SQL语句赋给Command对象
sqlcommand.CommandText = " update_student ";
// 说明命令类型为存储过程
sqlcommand.CommandType = CommandType.StoredProcedure;
sqlcommand.Parameters.AddWithValue( " @no ", TextBox1.Text);
sqlcommand.Parameters.AddWithValue( " @name ", TextBox2.Text);
sqlcommand.Parameters.AddWithValue( " @sex ", DropDownList1.Text);
sqlcommand.Parameters.AddWithValue( " @birth ", TextBox3.Text);
sqlcommand.Parameters.AddWithValue( " @address ", TextBox4.Text);
sqlcommand.Parameters.AddWithValue( " @photo ", FileUpload1.FileName);
try
{
// 打开连接
sqlconn.Open();
// 执行SQL命令
intUpdateCount=sqlcommand.ExecuteNonQuery();
// 把学生的照片上传到网站的“image”文件夹中
if (FileUpload1.HasFile == true)
{
FileUpload1.SaveAs(Server.MapPath(( " ~/image/ ") + FileUpload1.FileName));
}
if (intUpdateCount > 0)
Label1.Text = " 成功修改记录 ";
else
Label1.Text = " 该记录不存在 ";
}
catch (Exception ex)
{
Label1.Text = " 错误原因： " + ex.Message;
}
finally
{
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
}
从以上三个例子，可以看出，插入，删除，更新，都一个关键字，ExecuteNonQuery方法，返回的是影响行数。、
可以的话，来个ExecuteScalar 方法。
cmd.CommandText =
"
Insert into T_Users(UserName,Password)
output inserted.Id values( ' admin ', ' 888888 ') " ;
int i = Convert.ToInt32(cmd.ExecuteScalar());
output inserted.Id values( ' admin ', ' 888888 ') " ;
int i = Convert.ToInt32(cmd.ExecuteScalar());
得到自动增长字段的主键值，在values关键词前加上output inserted.Id，其中Id为主键字段名。执行结果就试插入的主键值，用ExecuteScalar执行最方便。SqlCommand的ExecuteScalar方法用于执行查询，并返回查询所返回的结果集中第一行的第一列，因为不能确定返回值的类型，所以返回值是object类型。
DataReader方式的查询数据行：
View Code
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.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
SqlCommand sqlcommand = new SqlCommand();
sqlcommand.Connection = sqlconn;
// 打开连接
sqlconn.Open();
// 建立Command对象
sqlcommand.CommandText = " select * from student ";
// 建立DataReader对象，返回查询结果
SqlDataReader sqldatareader=sqlcommand.ExecuteReader();
// 逐行遍历查询结果
while(sqldatareader.Read())
{
Label1.Text += sqldatareader.GetString( 0) + " ";
Label1.Text += sqldatareader.GetString( 1) + " ";
Label1.Text += sqldatareader.GetString( 2) + " ";
Label1.Text += sqldatareader.GetDateTime( 3) + " ";
Label1.Text += sqldatareader.GetString( 4) + " ";
Label1.Text += sqldatareader.GetString( 5) + " <br /> ";
};
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
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.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
SqlCommand sqlcommand = new SqlCommand();
sqlcommand.Connection = sqlconn;
// 打开连接
sqlconn.Open();
// 建立Command对象
sqlcommand.CommandText = " select * from student ";
// 建立DataReader对象，返回查询结果
SqlDataReader sqldatareader=sqlcommand.ExecuteReader();
// 逐行遍历查询结果
while(sqldatareader.Read())
{
Label1.Text += sqldatareader.GetString( 0) + " ";
Label1.Text += sqldatareader.GetString( 1) + " ";
Label1.Text += sqldatareader.GetString( 2) + " ";
Label1.Text += sqldatareader.GetDateTime( 3) + " ";
Label1.Text += sqldatareader.GetString( 4) + " ";
Label1.Text += sqldatareader.GetString( 5) + " <br /> ";
};
sqlcommand = null;
sqlconn.Close();
sqlconn = null;
}
}
reader的GetString、GetInt32等方法只接受整数参数，也就是序号，用GetOrdinal方法根据列名动态得到序号。
参数在SQLServer内部不是简单的字符串替换，SQLServer直接用添加的值进行数据比较，因此不会有注入漏洞攻击。
DataAdapter方式的查询数据行
View Code
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 System.Data.SqlClient;
public partial class adapter2 : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRowCollection对象
DataRowCollection coldrow;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 用DataRowCollection对象获取这个数据表的所有数据行
coldrow = dtable.Rows;
// 逐行遍历，取出各行的数据
for ( int inti = 0; inti < coldrow.Count; inti++)
{
drow = coldrow[inti];
Label1.Text += " 学号： " + drow[ 0];
Label1.Text += " 姓名： " + drow[ 1];
Label1.Text += " 性别： " + drow[ 2];
Label1.Text += " 出生日期： " + drow[ 3];
Label1.Text += " 地址： " + drow[ 4] + " <br /> ";
}
sqlconn.Close();
sqlconn = null;
}
}
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 System.Data.SqlClient;
public partial class adapter2 : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRowCollection对象
DataRowCollection coldrow;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 用DataRowCollection对象获取这个数据表的所有数据行
coldrow = dtable.Rows;
// 逐行遍历，取出各行的数据
for ( int inti = 0; inti < coldrow.Count; inti++)
{
drow = coldrow[inti];
Label1.Text += " 学号： " + drow[ 0];
Label1.Text += " 姓名： " + drow[ 1];
Label1.Text += " 性别： " + drow[ 2];
Label1.Text += " 出生日期： " + drow[ 3];
Label1.Text += " 地址： " + drow[ 4] + " <br /> ";
}
sqlconn.Close();
sqlconn = null;
}
}
遍历数据行还可以，foreach(DataRow row in dataset.Tables[0].Rows) {row["Name"]}
DataAdapter方式的更新数据行
View Code
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRowCollection对象
// DataRowCollection coldrow;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 定义Update命令，其中@NAME，@NO是两个参数
sqld.UpdateCommand = new SqlCommand( " UPDATE student SET NAME = @NAME WHERE NO = @NO ", sqlconn);
// 定义@NAME参数，对应于student表的NAME列
sqld.UpdateCommand.Parameters.Add( " @NAME ", SqlDbType.VarChar, 50, " NAME ");
// 定义@NO参数，对应于student表的NO列，而且@NO是修改前的原值
SqlParameter parameter = sqld.UpdateCommand.Parameters.Add( " @NO ", SqlDbType.VarChar, 10);
parameter.SourceColumn = " NO ";
parameter.SourceVersion = DataRowVersion.Original;
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 用DataRowCollection对象获取这个数据表的所有数据行
// coldrow = dtable.Rows;
// 修改操作，逐行遍历，取出各行的数据
for ( int inti = 0; inti < dtable.Rows.Count; inti++)
{
drow = dtable.Rows[inti];
// 给每位学生姓名后加上字母A
drow[ 1]=drow[ 1]+ " A ";
}
// 提交更新
sqld.Update(ds, " tabstudent ");
sqlconn.Close();
sqlconn = null;
Label1.Text = " 更新成功 ";
}
}
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRowCollection对象
// DataRowCollection coldrow;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 定义Update命令，其中@NAME，@NO是两个参数
sqld.UpdateCommand = new SqlCommand( " UPDATE student SET NAME = @NAME WHERE NO = @NO ", sqlconn);
// 定义@NAME参数，对应于student表的NAME列
sqld.UpdateCommand.Parameters.Add( " @NAME ", SqlDbType.VarChar, 50, " NAME ");
// 定义@NO参数，对应于student表的NO列，而且@NO是修改前的原值
SqlParameter parameter = sqld.UpdateCommand.Parameters.Add( " @NO ", SqlDbType.VarChar, 10);
parameter.SourceColumn = " NO ";
parameter.SourceVersion = DataRowVersion.Original;
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 用DataRowCollection对象获取这个数据表的所有数据行
// coldrow = dtable.Rows;
// 修改操作，逐行遍历，取出各行的数据
for ( int inti = 0; inti < dtable.Rows.Count; inti++)
{
drow = dtable.Rows[inti];
// 给每位学生姓名后加上字母A
drow[ 1]=drow[ 1]+ " A ";
}
// 提交更新
sqld.Update(ds, " tabstudent ");
sqlconn.Close();
sqlconn = null;
Label1.Text = " 更新成功 ";
}
}
这个例子是自己写的UpdateCommand方法。
可以调用SqlDataAdapter的Update方法将对DataSet的修改提交到数据库，Update方法有很多重载方法，可以提交整个DataSet、DataTable或者若干DataRow。但是需要为SqlDataAdapter提供DeleteCommand、UpdateCommand、InsertCommand它才知道如何将对DataSet的修改提交到数据库，由于这几个Command要求的格式非常苛刻，因此开发人员自己写非常困难，可以用SqlCommandBuilder自动生成这几个Command，用法很简单：new SqlCommandBuilder(adapter)。查看生成的Command（没有直接赋值给SqlDataAdapter ，看SqlCommandBuilder的）。SqlCommandBuilder要求表必须有主键。
下面这个例子就是SqlCommandBuilder自动生成的InsertCommand方法，也就是DataAdapter方式的插入数据行
View Code
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 建立 CommandBuilder 对象来自动生成 DataAdapter 的 Command 命令，否则就要自己编写
// Insertcommand ,deletecommand , updatecommand 命令。
SqlCommandBuilder cb = new SqlCommandBuilder(sqld);
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 增加新记录
drow = ds.Tables[ " tabstudent "].NewRow();
// 给该记录赋值
drow[ 0] = " 19 ";
drow[ 1] = " 陈峰 ";
drow[ 2] = " 男 ";
ds.Tables[ " tabstudent "].Rows.Add(drow);
// 提交更新
sqld.Update(ds, " tabstudent ");
sqlconn.Close();
sqlconn = null;
Label1.Text = " 增加成功 ";
}
}
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 建立 CommandBuilder 对象来自动生成 DataAdapter 的 Command 命令，否则就要自己编写
// Insertcommand ,deletecommand , updatecommand 命令。
SqlCommandBuilder cb = new SqlCommandBuilder(sqld);
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 增加新记录
drow = ds.Tables[ " tabstudent "].NewRow();
// 给该记录赋值
drow[ 0] = " 19 ";
drow[ 1] = " 陈峰 ";
drow[ 2] = " 男 ";
ds.Tables[ " tabstudent "].Rows.Add(drow);
// 提交更新
sqld.Update(ds, " tabstudent ");
sqlconn.Close();
sqlconn = null;
Label1.Text = " 增加成功 ";
}
}
DataAdapter方式的删除数据行
View Code
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRowCollection对象
DataRowCollection coldrow;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 建立 CommandBuilder 对象来自动生成 DataAdapter 的 Command 命令，否则就要自己编写
// Insertcommand ,deletecommand , updatecommand 命令。
SqlCommandBuilder cb = new SqlCommandBuilder(sqld);
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 用DataRowCollection对象获取这个数据表的所有数据行
coldrow = dtable.Rows;
// 逐行遍历，删除符合条件的记录
for ( int inti = 0; inti < coldrow.Count; inti++)
{
drow = coldrow[inti];
if (drow[ " address "].ToString()== "")
drow.Delete();
}
// 提交更新
sqld.Update(ds, " tabstudent ");
sqlconn.Close();
sqlconn = null;
Label1.Text = " 删除成功 ";
}
}
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
}
protected void Button1_Click( object sender, EventArgs e)
{
string sqlconnstr = ConfigurationManager.ConnectionStrings[ " ConnectionString "].ConnectionString;
SqlConnection sqlconn = new SqlConnection(sqlconnstr);
// 建立DataSet对象
DataSet ds = new DataSet();
// 建立DataTable对象
DataTable dtable;
// 建立DataRowCollection对象
DataRowCollection coldrow;
// 建立DataRow对象
DataRow drow;
// 打开连接
sqlconn.Open();
// 建立DataAdapter对象
SqlDataAdapter sqld = new SqlDataAdapter( " select * from student ", sqlconn);
// 建立 CommandBuilder 对象来自动生成 DataAdapter 的 Command 命令，否则就要自己编写
// Insertcommand ,deletecommand , updatecommand 命令。
SqlCommandBuilder cb = new SqlCommandBuilder(sqld);
// 用Fill方法返回的数据，填充DataSet，数据表取名为“tabstudent”
sqld.Fill(ds, " tabstudent ");
// 将数据表tabstudent的数据复制到DataTable对象
dtable = ds.Tables[ " tabstudent "];
// 用DataRowCollection对象获取这个数据表的所有数据行
coldrow = dtable.Rows;
// 逐行遍历，删除符合条件的记录
for ( int inti = 0; inti < coldrow.Count; inti++)
{
drow = coldrow[inti];
if (drow[ " address "].ToString()== "")
drow.Delete();
}
// 提交更新
sqld.Update(ds, " tabstudent ");
sqlconn.Close();
sqlconn = null;
Label1.Text = " 删除成功 ";
}
}