保存对审核跟踪表的更改的Sql触发器

我开始使用ADSSQL表触发器来存储对一个特定表所做的更改。以下是想法：

//-------- sql trigger to store changes on patients table to auditLog Table
//----------------------------------------------------------------------
declare cChanges Char( 5000 );
declare allColumns Cursor ;
declare FieldName Char( 25 );
declare StrSql  Char( 255 );
declare @new cursor as select * from __new;
declare @old cursor as select * from __old; 
open @old; 
fetch @old;
open @new; 
fetch @new;
Set cChanges = '';
Open AllColumns as Select * from system.columns where parent = 'patients';
while fetch allColumns DO
// Try
   FieldName = allColumns.Name;
   StrSql = 'IF @new.'+FieldName
          + '<> @old.'+FieldName
          +' and @old.'+FieldName + '<> [ ] THEN ' 
                       + 'cChanges = Trim( '+cChanges+' ) + @old.'+FieldName
                                   + ' Changed to ' + '@new.'+fieldname
                                   + ' | '+ 'ENDIF ; ' ;
   Execute Immediate StrSql ;
//    Catch ALL
//    End Try;
End While;
if cChanges <> '' THEN
    Insert Into AuditLog ( TableKey, Patient, [table], [user], creation, Changes ) 
         values( @new.patient, @new.patient, [Patietns], User(), Now(), cChanges ) ;
ENDIF;
CLOSE AllColumns;
//--------------------------

报告变量cChanges的上述触发代码错误不存在

有人能帮忙吗

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Reinaldo。

我认为问题与动态SQl试图设置触发器主体中声明的值有关

e、 g.您的cChanges=TRIM语句可能导致问题，因为该上下文中不存在cChanges

您应该使用绑定变量来实现这一点，而不是尝试使用=符号进行设置

你可以在他们的文档中看到，他们说你不能直接访问这些变量

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问题确实是，您无法访问脚本中的局部变量并立即执行。要解决此问题，您可以使用临时表：

//-------- sql trigger to store changes on patients table to auditLog Table
//----------------------------------------------------------------------
declare cChanges Char( 5000 );
declare allColumns Cursor ;
declare FieldName Char( 25 );
declare StrSql  Char( 255 );
Set cChanges = '';
Open AllColumns as Select * from system.columns where parent = 'patients';
while fetch allColumns DO
// Try
   FieldName = allColumns.Name;

   StrSql = 'SELECT n.FieldName newVal,'
            + 'o.FieldName oldVal '
            + 'INTO #MyTrigTable '
            + 'FROM __new n, __old o';

   EXECUTE IMMEDIATE strSQL;

   IF ( SELECT oldVal FROM #myTrigTable ) <> '' THEN
      IF ( SELECT newVal FROM #myTrigTable ) <> ( SELECT oldVal FROM #myTrigTable ) THEN
         cChanges = 'Construct_SomeThing_Using_#myTrigTable_or_a_cursorBasedOn#MyTrigTable';
         INSERT INTO AuditLog ( TableKey, Patient, [table], [user], creation, Changes ) 
         SELECT patient, patient, 'Patietns', User(), Now(), cChages FROM __new ;
      END;
   END;
   DROP TABLE #myTrigTable;
//    Catch ALL
//    End Try;
End While;
CLOSE AllColumns;
//--------------------------

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可能不相关，但是值@new.patient、@new.patient、[Patietns]，用户。。。打字错误[病人]？