2013-04-12 18:45 by AceYue, 407 阅读, 0 评论, 收藏, 编辑
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:
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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