Caché Transact-SQL (TSQL) Migration Guide - InterSystems ...

@@ Special VariablesCOS LOCK commandSQL SET OPTION LOCK_TIMEOUT7.2.5 @@NESTLEVELContains an integer specifying the nesting level of the current process. The maximum is 16.SET myquery = "PRINT @@NESTLEVEL"SET tStatement = ##class(%SQL.Statement).%New(,,"MSSQL")SET qStatus = tStatement.%Prepare(myquery)IF qStatus'=1 { WRITE "%Prepare failed",$System.Status.DisplayError(qStatus) QUIT}SET rset = tStatement.%Execute()DO rset.%Display()COS $STACK7.2.6 @@ROWCOUNTContains the number of rows affected by the most recent SELECT, INSERT, UPDATE, or DELETE command. A singlerowSELECT always returns a @@ROWCOUNT value of either 0 (no row selected) or 1.When invoking an AFTER statement level trigger, the @@ROWCOUNT value upon entering the trigger is the@@ROWCOUNT immediately prior to the trigger. Rows affected within the scope of the trigger code are reflected in the@@ROWCOUNT value. Upon completion of the trigger code, @@ROWCOUNT reverts to the value immediately priorto the trigger invocation.COS %ROWCOUNTSQL :%ROWCOUNT7.2.7 @@SERVERNAMEContains the Caché instance name.SET myquery = "SELECT @@SERVERNAME AS CacheInstance"SET tStatement = ##class(%SQL.Statement).%New(,,"MSSQL")SET qStatus = tStatement.%Prepare(myquery)IF qStatus'=1 { WRITE "%Prepare failed",$System.Status.DisplayError(qStatus) QUIT}SET rset = tStatement.%Execute()DO rset.%Display()COS $PIECE($system,":",2)7.2.8 @@SPIDContains the server process ID of the current process.SET myquery = "SELECT @@SPID AS ProcessID"SET tStatement = ##class(%SQL.Statement).%New(,,"MSSQL")SET qStatus = tStatement.%Prepare(myquery)IF qStatus'=1 { WRITE "%Prepare failed",$System.Status.DisplayError(qStatus) QUIT}SET rset = tStatement.%Execute()DO rset.%Display()COS $JOBSQL $TSQL_SPID()Caché Transact-SQL (TSQL) Migration Guide 55