【下载文档:  动态组合SQL语句方式实现批量更新的实例.txt 】

---

动态组合SQL语句方式实现批量更新的实例
Default.aspx
复制代码 代码如下:<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Index.aspx.cs" Inherits="Index" %>

Default.aspx.cs
复制代码 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
复制代码 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;
///

///StrHelper 的摘要说明///

public class StrHelper{ public StrHelper(){} ///

/// 截取字符串函数 ///

/// 所要截取的字符串 /// 截取字符串的长度 /// static public string GetSubString(string str, int num) { #region return (str.Length > num) ? str.Substring(0, num) + "..." : str; #endregion } ///

/// 截取字符串优化版 ///

/// 所要截取的字符串 /// 截取字符串的长度 /// 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 /// /// 窗口信息 public static void Alert(string message) { #region string js = @""; 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(""); } else { gdv.Controls[0].Controls.Clear(); gdv.Controls[0].Controls.AddAt(0, row); gdv.Controls[0].Controls.AddAt(1, row1); } }}