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【代码保留】用于生成RowNumber的程序

2009-10-20 21:20 309 查看

因为Sybase没有rownumber，所以最近要做迁移数据很头痛，我的做法是从表A生成一组SQL语句，将rownumber设置成一个特殊的关键字，然后用下面这个程序来将其替换成有效的值。

准确得说，这个代码的功能就是将“字符串A”匹配成一个“前缀+顺序序列”的替换程序。

GenRowNumber.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="GenRowNumber.aspx.cs" Inherits="WebAppClient.GenRowNumber" %>

<!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>重置Rownumber</title>

</head>

<body>

<form id="form1" runat="server">

<div>

要被替换的字符：<asp:TextBox ID="txtRowNumber" runat="server"></asp:TextBox>（如“row_number”） 

生成的字符前缀：<asp:TextBox ID="txtPrefix" runat="server"></asp:TextBox>（如“20091017”，长度必须小于最大长度） 

允许的最大长度：<asp:TextBox ID="txtMaxLength" runat="server"></asp:TextBox>（类型：数字）

 

每组数据条数：<asp:TextBox ID="txtSQLNumber" runat="server"></asp:TextBox>（如两句SQL一组则填2） 

<asp:TextBox ID="txtSQL" runat="server" TextMode="MultiLine" Height="418px" Width="790px"></asp:TextBox>

 

<asp:Button ID="btnGenerate" runat="server" Text="Generate" OnClick="btnGenerate_Click" />

 

<asp:Label ID="lbOutput" runat="server" Text=""></asp:Label>

<asp:TextBox ID="txtSQLOutput" runat="server" TextMode="MultiLine" Height="418px" Width="790px"></asp:TextBox>

</div>

</form>

</body>

</html>

GenRowNumber.aspx.cs

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;

namespace WebAppClient

{

public partial class GenRowNumber : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void btnGenerate_Click(object sender, EventArgs e)

{

if (Check())

{

sql = txtSQL.Text;

while (sql.IndexOf(replaceWord) != -1)

{

string currentSeq = GetNewSeqNo();

for (int i = 0; i < sqlNumber; ++i)

{

if (sql.IndexOf(replaceWord) != -1)

{

int firstPos = sql.IndexOf(replaceWord);

int nextPos = firstPos + replaceWord.Length;

sql = sql.Substring(0, firstPos) + currentSeq + sql.Substring(nextPos, sql.Length - nextPos);

}

}

}

sql = sql.Replace("go \"\n", "go\n");

txtSQLOutput.Text = sql;

}

}

private int seq = 0;

private string GetNewSeqNo()

{

++seq;

return prefix + seq.ToString().PadLeft(seqLength, '0');

}

private string sql = string.Empty;

private string replaceWord = string.Empty;

private int maxLength = 0;

private int seqLength = 0;

private string prefix = string.Empty;

private int sqlNumber = 0;

private bool Check()

{

string txtMaxLength = this.txtMaxLength.Text.Trim();

if (!int.TryParse(txtMaxLength, out maxLength))

{

maxLength = 12;

}

prefix = this.txtPrefix.Text.Trim();

if (prefix.Length > maxLength)

{

Output(string.Format("前缀长度（{0}）比最大长度（{1}）还大", prefix.Length.ToString(), maxLength.ToString()));

return false;

}

string txtSqlNumber = this.txtSQLNumber.Text.Trim();

if (!int.TryParse(txtSqlNumber, out sqlNumber))

{

sqlNumber = 1;

}

replaceWord = this.txtRowNumber.Text.Trim();

if (string.IsNullOrEmpty(replaceWord))

{

Output(string.Format("要被替换的字符不能为空 "));

return false;

}

seqLength = maxLength - prefix.Length;

Output(string.Format("要被替换的字符：{0} ", replaceWord));

Output(string.Format("生成的字符前缀：{0} ", prefix));

Output(string.Format("生成的字符前缀长度：{0} ", prefix.Length.ToString()));

Output(string.Format("允许的最大长度：{0} ", maxLength.ToString()));

Output(string.Format("每组数据条数：{0} ", sqlNumber.ToString()));

return true;

}

private void Output(string msg)

{

this.lbOutput.Text += msg + " ";

}

}

}

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