动态组合SQL语句方式实现批量更新的实例
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Default.aspx
代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Index.aspx.cs" Inherits="Index" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>供求信息网审核发布信息</title>
</head>
<body class="Font">
<form id="form1" runat="server">
<div style="text-align: left" align="left"><asp:Panel ID="Panel2" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
OnRowDataBound="GridView1_RowDataBound"
OnSelectedIndexChanging="GridView1_SelectedIndexChanging" Font-Size="9pt"
AllowPaging="True" EmptyDataText="没有相关数据可以显示！"
OnPageIndexChanging="GridView1_PageIndexChanging" CellPadding="4"
ForeColor="#333333" GridLines="None" DataKeyNames="id">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="cbSingleOrMore" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="id" HeaderText="信息ID" />
<asp:BoundField DataField="name" HeaderText="信息主题" />
<asp:BoundField DataField="type" HeaderText="信息分类" />
<asp:BoundField DataField="content" HeaderText="发布内容" />
<asp:BoundField DataField="userName" HeaderText="发布人" />
<asp:BoundField DataField="lineMan" HeaderText="联系人" />
<asp:BoundField DataField="issueDate" HeaderText="发布时间"
DataFormatString="{0:d}" />
</Columns>
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Right" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
</asp:Panel>
<asp:CheckBox ID="cbAll" runat="server" AutoPostBack="True"
Font-Size="9pt" OnCheckedChanged="cbAll_CheckedChanged"
Text="全选/反选" />
<asp:Button ID="btnUpdateTime" runat="server" onclick="btnUpdateTime_Click"
Text="更新发布时间" />
</div>
</form>
</body>
</html>
Default.aspx.cs
代码如下:
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.Text;
using System.Data.SqlClient;
public partial class Index : System.Web.UI.Page
{
SqlConnection sqlcon;
string strCon = ConfigurationManager.AppSettings["conStr"];
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.GV_DataBind();
}
}
public void GV_DataBind()
{
string sqlstr = "select * from tb_inf";
sqlcon = new SqlConnection(strCon);
SqlDataAdapter da = new SqlDataAdapter(sqlstr, sqlcon);
DataSet ds = new DataSet();
sqlcon.Open();
da.Fill(ds, "tb_inf");
sqlcon.Close();
this.GridView1.DataSource = ds;
this.GridView1.DataKeyNames = new string[] { "id" };
this.GridView1.DataBind();
if (GridView1.Rows.Count > 0)
{
return;//有数据，不要处理
}
else//显示表头并显示没有数据的提示信息
{
StrHelper.GridViewHeader(GridView1);
}
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
string gIntro = e.Row.Cells[4].Text;
e.Row.Cells[4].Text = StrHelper.GetFirstString(gIntro, 12);
}
}
protected void GridView1_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
{
string id = this.GridView1.DataKeys[e.NewSelectedIndex].Value.ToString();
sqlcon = new SqlConnection(strCon);
SqlCommand com = new SqlCommand("select [check] from tb_inf where id='" + id + "'", sqlcon);
sqlcon.Open();
string count = Convert.ToString(com.ExecuteScalar());
if (count == "False")
{
count = "1";
}
else
{
count = "0";
}
com.CommandText = "update tb_inf set [check]=" + count + " where id=" + id;
com.ExecuteNonQuery();
sqlcon.Close();
this.GV_DataBind();
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
this.GridView1.PageIndex = e.NewPageIndex;
this.GV_DataBind();
}
protected void cbAll_CheckedChanged(object sender, EventArgs e)
{
for (int i = 0; i <= GridView1.Rows.Count - 1; i++)//遍历
{
CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("cbSingleOrMore");
if (cbAll.Checked == true)
{
cbox.Checked = true;
}
else
{
cbox.Checked = false;
}
}
}
protected void btnUpdateTime_Click(object sender, EventArgs e)
{
StringBuilder builder = new StringBuilder();
int i = 0;
foreach (GridViewRow row in this.GridView1.Rows)//循环遍历GridView控件中行，拼装IN子句
{
CheckBox cbox = row.FindControl("cbSingleOrMore") as CheckBox;
if (cbox.Checked)//判断复选框是否被选中
{
//当数据行中的复选框被选中时，即将该行记录的主键值放入IN子句中
builder.AppendFormat("'{0}',", this.GridView1.DataKeys[row.RowIndex].Value.ToString());
i++;
continue;
}
continue;
}
if (builder.ToString().Length == 0)//当IN子句中没有任何数据行，则弹出提示
{
StrHelper.Alert("没有选中任何数据行，请重新选择！");
return;
}
//移除StringBuilder对象中的最后一个“,”
builder.Remove(builder.ToString().LastIndexOf(","), 1);
//拼装SQL语句
string SqlBuilderCopy = string.Format("Update tb_inf set issueDate='{0}' WHERE id IN ({1})", DateTime.Now.ToString(), builder.ToString());
sqlcon = new SqlConnection(strCon);//创建数据库连接
SqlCommand sqlcom;//创建命令对象变量
int result = 0;
if (sqlcon.State.Equals(ConnectionState.Closed))
sqlcon.Open();//打开数据库连接
sqlcom = new SqlCommand(SqlBuilderCopy, sqlcon);
SqlTransaction tran = sqlcon.BeginTransaction();//实例化事务，注意实例化事务必须在数据库连接开启状态下
sqlcom.Transaction = tran;//将命令对象与连接对象关联
try
{
result = sqlcom.ExecuteNonQuery();//接收影响的行数
tran.Commit();//提交事务
}
catch (SqlException ex)
{
StrHelper.Alert(string.Format("SQL语句发生了异常，异常如下所示:\n{0}", ex.Message));
tran.Rollback();//出现异常，即回滚事务，防止出现脏数据
return;
}
finally
{
sqlcon.Close();
}
if (result == i)//判断影响行数是否等于选中的数据行
{
StrHelper.Alert("数据更新成功！");
}
else
{
StrHelper.Alert("数据更新失败，事务已回滚！");
}
GV_DataBind();//重新绑定控件数据
return;
}
}
StrHelper.cs
代码如下:
using System;
using System.Data;
using System.Configuration;
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;
//引入如下命名空间
using System.Text.RegularExpressions;
using System.Text;
/// <summary>
///StrHelper 的摘要说明
/// </summary>
public class StrHelper
{
public StrHelper(){}
/// <summary>
/// 截取字符串函数
/// </summary>
/// <param name="str">所要截取的字符串</param>
/// <param name="num">截取字符串的长度</param>
/// <returns></returns>
static public string GetSubString(string str, int num)
{
#region
return (str.Length > num) ? str.Substring(0, num) + "..." : str;
#endregion
}
/// <summary>
/// 截取字符串优化版
/// </summary>
/// <param name="stringToSub">所要截取的字符串</param>
/// <param name="length">截取字符串的长度</param>
/// <returns></returns>
public static string GetFirstString(string stringToSub, int length)
{
#region
Regex regex = new Regex("[\u4e00-\u9fa5]+", RegexOptions.Compiled);
char[] stringChar = stringToSub.ToCharArray();
StringBuilder sb = new StringBuilder();
int nLength = 0;
bool isCut = false;
for (int i = 0; i < stringChar.Length; i++)
{
if (regex.IsMatch((stringChar[i]).ToString()))//regex.IsMatch指示正则表达式在输入字符串中是否找到匹配项
{
sb.Append(stringChar[i]);//将信息追加到当前 StringBuilder 的结尾
nLength += 2;
}
else
{
sb.Append(stringChar[i]);
nLength = nLength + 1;
}
if (nLength > length)//替换字符串
{
isCut = true;
break;
}
}
if (isCut)
return sb.ToString() + "...";
else
return sb.ToString();
#endregion
}
/// 弹出JavaScript小窗口
/// </summary>
/// <param name="js">窗口信息</param>
public static void Alert(string message)
{
#region
string js = @"<Script language='JavaScript'>
alert('" + message + "');</Script>";
HttpContext.Current.Response.Write(js);
#endregion
}
public static void GridViewHeader(GridView gdv)//显示表头并显示没有数据的提示信息
{
//表头的设置
GridViewRow row = new GridViewRow(-1, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
foreach (DataControlField field in gdv.Columns)
{
TableCell cell = new TableCell();
cell.Text = field.HeaderText;
cell.Width = field.HeaderStyle.Width;
cell.Height = field.HeaderStyle.Height;
cell.ForeColor = field.HeaderStyle.ForeColor;
cell.Font.Size = field.HeaderStyle.Font.Size;
cell.Font.Bold = field.HeaderStyle.Font.Bold;
cell.Font.Name = field.HeaderStyle.Font.Name;
cell.Font.Strikeout = field.HeaderStyle.Font.Strikeout;
cell.Font.Underline = field.HeaderStyle.Font.Underline;
cell.BackColor = field.HeaderStyle.BackColor;
cell.VerticalAlign = field.HeaderStyle.VerticalAlign;
cell.HorizontalAlign = field.HeaderStyle.HorizontalAlign;
cell.CssClass = field.HeaderStyle.CssClass;
cell.BorderColor = field.HeaderStyle.BorderColor;
cell.BorderStyle = field.HeaderStyle.BorderStyle;
cell.BorderWidth = field.HeaderStyle.BorderWidth;
row.Cells.Add(cell);
}
TableItemStyle headStyle = gdv.HeaderStyle;
TableItemStyle emptyStyle = gdv.EmptyDataRowStyle;
emptyStyle.Width = headStyle.Width;
emptyStyle.Height = headStyle.Height;
emptyStyle.ForeColor = headStyle.ForeColor;
emptyStyle.Font.Size = headStyle.Font.Size;
emptyStyle.Font.Bold = headStyle.Font.Bold;
emptyStyle.Font.Name = headStyle.Font.Name;
emptyStyle.Font.Strikeout = headStyle.Font.Strikeout;
emptyStyle.Font.Underline = headStyle.Font.Underline;
emptyStyle.BackColor = headStyle.BackColor;
emptyStyle.VerticalAlign = headStyle.VerticalAlign;
emptyStyle.HorizontalAlign = headStyle.HorizontalAlign;
emptyStyle.CssClass = headStyle.CssClass;
emptyStyle.BorderColor = headStyle.BorderColor;
emptyStyle.BorderStyle = headStyle.BorderStyle;
emptyStyle.BorderWidth = headStyle.BorderWidth;
//空白行的设置
GridViewRow row1 = new GridViewRow(0, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
TableCell cell1 = new TableCell();
cell1.Text = "没有相关数据可以显示！";
cell1.BackColor = System.Drawing.Color.White;
row1.Cells.Add(cell1);
cell1.ColumnSpan = 6;//合并列
if (gdv.Controls.Count == 0)
{
gdv.Page.Response.Write("<script language='javascript'>alert('必须在初始化表格类之前执行DataBind方法并设置EmptyDataText属性不为空!');</script>");
}
else
{
gdv.Controls[0].Controls.Clear();
gdv.Controls[0].Controls.AddAt(0, row);
gdv.Controls[0].Controls.AddAt(1, row1);
}
}
}
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