用正则提取SQL脚本关键字屏蔽常见错误
2013-04-12 18:45 AceYue 阅读(1410) 评论(0) 编辑 收藏 举报每天的批量部署SQL script难免会出现一些小差错，为了避免某些常见而又容易忽略的错误的出现，我们在执行前先将脚本过滤一遍，通过一些关键字来提示是否出现了不符合的设置。
本实例以创建表和给表怎加列不容许出现null列以及在执行脚本过程中不容许出现设置SET ANSI_PADDING OFF为例，利用正则获取脚本中的关键字，以检索是否符合要求。
完成这个任务我们的主要挑战是如何获取sql 脚本中的关键字，如创建新table时，我们如何判断出那一段脚本是字段列，这里就需要用的正则来提取出关键字。来看看通常创建表的脚本：
CREATE TABLE [dbo].[A]( [EmployerID] [int] NOT NULL, [InvoiceItemID] [int] NOT NULL ) ON [PRIMARY] GO
像这样的语句结构我们只需要提取出“CREATE TABLE [dbo].[A](” 与“) ON [PRIMARY] GO”之间的语句然后用‘，’分割出每个字段，即可判断是否有“NOT NULL”关键字。
但是事与愿违，我们穿件一个表可能面临着更多的情况，比如需要设置主键：
create table Ace ( AceID int, AceName nvarchar(20), CONSTRAINT [PK_Billing_SalesInvoice_Item] PRIMARY KEY CLUSTERED ( AceID ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY]
很明显这个脚本中，我们要提取的就是“Create table Ace (” 与 “CONSTRAINT” 之间的内容了。所以处理起来就需要分情况而定。下面来看我的处理：
/// <summary>
/// Check exists "NOT NULL" when create table.
/// </summary>
/// Author: Ace Yue
/// Date:2013-04-08
/// <param name="sqlScript">the sql script</param>
protected void CheckNullableWhenCreate(string sqlScript)
{
string sCreateBegin = @"\s?create\s+table\s+((dbo.)?|(\[dbo\].)?)(\[?)([a-z]+[_,a-z0-9]*(\]?))(\s*)(\()(\s*)";//Get the script start when create new table.
Regex regCheck = new Regex(sCreateBegin);
if (regCheck.IsMatch(sqlScript))
{
int iSplitStart = sqlScript.IndexOf(regCheck.Match(sqlScript).Value);
int iSplitEnd = 0;
string sSplit = sqlScript.Substring(iSplitStart + regCheck.Match(sqlScript).Value.Length);//Capture the script behind the table's name.
string sEndGeneral = @"(\s*)(?<![0-9])(\){1})";// get the ")" but not in "(10)"
string sEndSpecific = @"(\,\s*)(constraint)(\s+)((\[?)[a-z]+[_,a-z0-9]*(\]?))(\s+)(primary)(\s+)(key)(\s+)(clustered)"; //Get the "CONSTRAINT" when the script contain "CONSTRAINT".
Regex regEndGeneral = new Regex(sEndGeneral);
Regex regEndSpecific = new Regex(sEndSpecific);
if (regEndSpecific.IsMatch(sSplit))
iSplitEnd = sSplit.IndexOf(regEndSpecific.Match(sSplit).Value);
else if (regEndGeneral.IsMatch(sSplit))
iSplitEnd = sSplit.IndexOf(regEndGeneral.Match(sSplit).Value);
else
iSplitEnd = sSplit.Length;
sSplit = sSplit.Substring(0, iSplitEnd);
string[] arrScript = sSplit.Split(',');
string sExistsNotNull = @"(\s+)(not)(\s+)(null)(\s*)";
Regex regExistsNotNull = new Regex(sExistsNotNull);
foreach (string sItem in arrScript)
{
if (!regExistsNotNull.IsMatch(sItem))
{
this.bPass = false;
this.SReturn += "The SQL script not contain \"NOT NULL\" in some column when create table. Do you want continue ? \r\n";
}
}
}
}
下面来看看Alter表的情况：
ALTER TABLE dbo.Billing_Plan_Payment_Bank_Log
Add InvoiceReference1 NVarChar(100) NOT NULL CONSTRAINT
DF_Billing_Plan_Payment_Bank_Log_InvoiceReference1 DEFAULT '',
InvoiceReference2 NVarChar(100) NOT NULL CONSTRAINT
DF_Billing_Plan_Payment_Bank_Log_InvoiceReference2 DEFAULT '',
InvoiceReference3 NVarChar(100) NOT NULL CONSTRAINT
DF_Billing_Plan_Payment_Bank_Log_InvoiceReference3 DEFAULT ''
Go
处理的方面与上述情况类似，我们需要提取想要的东西就可以了：
/// <summary>
/// Check the script exists "NOT NULL" when Alter table add columns.
/// </summary>
/// Author: Ace Yue
/// Date:2013-04-08
/// <param name="sqlScript">the sql script</param>
protected void CheckNullableWhenAlter(string sqlScript)
{
string sAlterBegin = @"(\s*)(alter)(\s+)(table)(\s+)((dbo.)?|(\[dbo\].)?)(\[?)([a-z]+[_,a-z0-9]*(\]?))(\s+)(add)(\s+)";// Get the script begin when alter table. like "ALTER TABLE dbo.Billing_Plan_Payment_Bank_Log Add"
Regex regCheck = new Regex(sAlterBegin);
if (regCheck.IsMatch(sqlScript))
{
int iSplitStart = sqlScript.IndexOf(regCheck.Match(sqlScript).Value);
string sSplit = sqlScript.Substring(iSplitStart + regCheck.Match(sqlScript).Value.Length);
string sAlterEnd = @"(\s+)((go\s+)|(go$))";
Regex regEnd = new Regex(sAlterEnd);
int iSplitEnd = 0;
if (regEnd.IsMatch(sSplit))
iSplitEnd = sSplit.IndexOf(regEnd.Match(sSplit).Value);
else
iSplitEnd = sSplit.Length;
sSplit = sSplit.Substring(0, iSplitEnd);
string[] arrScript = sSplit.Split(',');
string sExistsNotNull = @"(\s+)(not)(\s+)(null)(\s*)";
Regex regExistsNotNull = new Regex(sExistsNotNull);
foreach (string sItem in arrScript)
{
if (!regExistsNotNull.IsMatch(sItem))
{
this.bPass = false;
this.SReturn += "The SQL script not contain \"NOT NULL\" in some column when add new column. Do you want continue ? \r\n";
}
}
}
}
处理SET ANSI_PADDING OFF 这个就是太简单了，主需要查出就可以了：
/// <summary>
/// Check the Script is contain "Set ANSI OFF" when
/// </summary>
/// Author: Ace Yue
/// Date:2013-04-08
/// <param name="sqlScript">The SQL Script whose you want to check</param>
protected void CheckANSI(string sqlScript)
{
Regex reg = new Regex(@"set\s+ansi_padding{1}\s+(off\s+|off$)");// Is there have "SET ANSI_PADDING OFF"
if (reg.IsMatch(sqlScript))
{
this.BPass = false;
this.SReturn += "This SQL script contain \"SET ANSI_PADDING OFF\". Do you want to continue?\r\n";
}
}
到了这里我们的任务就完成了，下面是我的完整Demo：
//==============================================================
// Copyright (C) Moonplus.net Corporation . Ace Yue 2013-04-08
//==============================================================
using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
namespace SQLScript
{
/// <summary>
/// Define check the SQL Script delegate.
/// </summary>
/// <param name="sqlScrit">The SQL Script.</param>
public delegate void CheckScriptDel(string sqlScrit);
public class ScriptCheckHelper
{
private bool bPass = true;
public bool BPass { get { return bPass; } set { this.bPass = value; } }
private string sReturn = "";
public string SReturn { get { return sReturn; } set { this.sReturn = value; } }
/// <summary>
/// Start invoke the check script function.
/// </summary>
/// Author: Ace Yue
/// Date: 2013-04-08
/// Mantis:0033628: SIS 3.0 - Research - Build a small SQL script validation tools to Check SQL issues
/// <param name="sqlScript">The SQL Script whose you want to check</param>
public void StartCheck(string sqlScript)
{
CheckScriptDel checkDel = CheckNullable;
checkDel += CheckANSI;
checkDel(sqlScript.ToLower());
}
/// <summary>
/// Check the Script is contain the nullable field when create table or add new field.
/// </summary>
/// <param name="sqlScirpt">The SQL Script whose you want to check</param>
protected void CheckNullable(string sqlScirpt)
{
CheckScriptDel checkNullable = CheckNullableWhenCreate;
checkNullable += CheckNullableWhenAlter;
checkNullable(sqlScirpt);
}
/// <summary>
/// Check the Script is contain "Set ANSI OFF" when
/// </summary>
/// <param name="sqlScript">The SQL Script whose you want to check</param>
protected void CheckANSI(string sqlScript)
{
Regex reg = new Regex(@"set\s+ansi_padding{1}\s+(off\s+|off$)");// Is there have "SET ANSI_PADDING OFF"
if (reg.IsMatch(sqlScript))
{
this.BPass = false;
this.SReturn += "This SQL script contain \"SET ANSI_PADDING OFF\". Do you want to continue?\r\n";
}
}
/// <summary>
/// Check exists "NOT NULL" when create table.
/// </summary>
/// <param name="sqlScript">the sql script</param>
protected void CheckNullableWhenCreate(string sqlScript)
{
string sCreateBegin = @"\s?create\s+table\s+((dbo.)?|(\[dbo\].)?)(\[?)([a-z]+[_,a-z0-9]*(\]?))(\s*)(\()(\s*)";//Get the script start when create new table.
Regex regCheck = new Regex(sCreateBegin);
if (regCheck.IsMatch(sqlScript))
{
int iSplitStart =sqlScript.IndexOf(regCheck.Match(sqlScript).Value);
int iSplitEnd = 0;
string sSplit = sqlScript.Substring(iSplitStart + regCheck.Match(sqlScript).Value.Length);//Capture the script behind the table's name.
string sEndGeneral = @"(\s*)(?<![0-9])(\){1})";// get the ")" but not in "(10)"
string sEndSpecific = @"(\,\s*)(constraint)(\s+)((\[?)[a-z]+[_,a-z0-9]*(\]?))(\s+)(primary)(\s+)(key)(\s+)(clustered)"; //Get the "CONSTRAINT" when the script contain "CONSTRAINT".
Regex regEndGeneral = new Regex(sEndGeneral);
Regex regEndSpecific = new Regex(sEndSpecific);
if (regEndSpecific.IsMatch(sSplit))
iSplitEnd = sSplit.IndexOf(regEndSpecific.Match(sSplit).Value);
else if (regEndGeneral.IsMatch(sSplit))
iSplitEnd = sSplit.IndexOf(regEndGeneral.Match(sSplit).Value);
else
iSplitEnd = sSplit.Length;
sSplit = sSplit.Substring(0, iSplitEnd);
string[] arrScript = sSplit.Split(',');
string sExistsNotNull = @"(\s+)(not)(\s+)(null)(\s*)";
Regex regExistsNotNull =new Regex(sExistsNotNull);
foreach (string sItem in arrScript)
{
if (!regExistsNotNull.IsMatch(sItem))
{
this.bPass = false;
this.SReturn += "The SQL script not contain \"NOT NULL\" in some column when create table. Do you want continue ? \r\n";
}
}
}
}
/// <summary>
/// Check the script exists "NOT NULL" when Alter table add columns.
/// </summary>
/// <param name="sqlScript">the sql script</param>
protected void CheckNullableWhenAlter(string sqlScript)
{
string sAlterBegin = @"(\s*)(alter)(\s+)(table)(\s+)((dbo.)?|(\[dbo\].)?)(\[?)([a-z]+[_,a-z0-9]*(\]?))(\s+)(add)(\s+)";// Get the script begin when alter table. like "ALTER TABLE dbo.Billing_Plan_Payment_Bank_Log Add"
Regex regCheck = new Regex(sAlterBegin);
if (regCheck.IsMatch(sqlScript))
{
int iSplitStart = sqlScript.IndexOf(regCheck.Match(sqlScript).Value);
string sSplit = sqlScript.Substring(iSplitStart + regCheck.Match(sqlScript).Value.Length);
string sAlterEnd = @"(\s+)((go\s+)|(go$))";
Regex regEnd = new Regex(sAlterEnd);
int iSplitEnd=0;
if (regEnd.IsMatch(sSplit))
iSplitEnd = sSplit.IndexOf(regEnd.Match(sSplit).Value);
else
iSplitEnd = sSplit.Length;
sSplit = sSplit.Substring(0, iSplitEnd);
string[] arrScript = sSplit.Split(',');
string sExistsNotNull = @"(\s+)(not)(\s+)(null)(\s*)";
Regex regExistsNotNull = new Regex(sExistsNotNull);
foreach (string sItem in arrScript)
{
if (!regExistsNotNull.IsMatch(sItem))
{
this.bPass = false;
this.SReturn += "The SQL script not contain \"NOT NULL\" in some column when add new column. Do you want continue ? \r\n";
}
}
}
}
}
}
看看运行结果：
由于正则表达式我是现学现卖，并不能保证对所有情况都考虑到，如果有遗漏欢迎提出来，谢谢！
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