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

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TSQL VariablesBecause the term “global variable” is used widely in Caché and differs significantly in meaning, these TSQL @@ variablesare referred to here as “special variables” to avoid confusion.The following special variables are implemented. Invoking an unimplemented special variable generates a #5001 '@@nnn'unresolved symbol error or a #5002 error. The corresponding Caché ObjectScript (COS) and CachéSQL generated code for each special variable is provided:7.2.1 @@ERRORContains the error number of the most recent TSQL error. 0 indicates that no error has occurred. A 0 value is returned wheneither SQLCODE=0 (successful completion) or SQLCODE=100 (no data, or no more data). To differentiate these tworesults, use @@SQLSTATUS.COS SQLCODESQL :SQLCODE7.2.2 @@FETCH_STATUSContains an integer specifying the status of the last FETCH cursor statement. The available options are: 0=row successfullyfetched; –1=no data could be fetched; –2 row fetched is missing or some other error occurred. A value of –1 can indicatethat there is no data to FETCH, or that the fetch has reached the end of the data.COS $Case($Get(SQLCODE,0),0:0,100:-1,:-2)SQL CASE :SQLCODE WHEN 0 THEN 0 WHEN 100 THEN –1 ELSE –2 END7.2.3 @@IDENTITYContains the IDENTITY field value of the most recently inserted, updated, or deleted row.COS %ROWIDSQL :%ROWID7.2.4 @@LOCK_TIMEOUTContains an integer specifying the timeout value for locks, in seconds. Lock timeout is used when a resource needs to beexclusively locked for inserts, updates, deletes, and selects. The default is 10.COS LOCK commandSQL SET OPTION LOCK_TIMEOUT7.2.5 @@NESTLEVELContains an integer specifying the nesting level of the current process. The maximum is 16.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 the52 Caché Transact-SQL (TSQL) Migration Guide
@@ Special Variables@@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.COS $PIECE($system,":",2)7.2.8 @@SPIDContains the server process ID of the current process.COS $JOBSQL $TSQL_SPID()7.2.9 @@SQLSTATUSContains an integer specifying the completion status of the most recent SQL statement. Available values are: 0=successfulcompletion; 1=failure; 2=no (more) data available.COS $Case($Get(SQLCODE,0),0:0,100:2,:1)SQL CASE :SQLCODE WHEN 0 THEN 0 WHEN 100 THEN 2 ELSE 1 END7.2.10 @@TRANCOUNTContains the number of currently active transactions.COS $TLEVELSQL $TSQL_TRANCOUNT()7.2.11 @@VERSIONContains the Caché version number and date and time of its installation.COS $ZVERSIONCaché Transact-SQL (TSQL) Migration Guide 53
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Caché Transact-SQL (TSQL)Migration
Page 3 and 4:
Table of ContentsAbout This Book ..
Page 5 and 6:
6.1.6 AVG .........................
Page 7: About This BookThis book describes
Page 10 and 11: OverviewAlternatively, you can invo
Page 13 and 14: 2Caché TSQL Constructs2.1 Current
Page 15: Commonly Used ConstructsDECLARE C C
Page 20: Caché TSQL Language ElementsBOOLEA
Page 23 and 24: 4TSQL CommandsThis chapter lists th
Page 25 and 26: Data Definition Language (DDL) Stat
Page 27 and 28: Data Management Language (DML) Stat
Page 29 and 30: Query StatementsA WHERE clause can
Page 31: Transaction StatementsDECLARE @var
Page 34 and 35: TSQL Commands4.7.2 ALTER FUNCTIONSu
Page 36 and 37: TSQL Commands4.9.2 IMPORTASQUERYThi
Page 38 and 39: TSQL SettingsThe default value is 1
Page 40 and 41: TSQL Functions6.1.6 AVGAVG(numfield
Page 42 and 43: TSQL FunctionsFor further details,
Page 44 and 45: TSQL Functionsyymmdddw, wwkhhmissms
Page 46 and 47: TSQL Functions6.1.25 DAYDAY(date)Re
Page 48 and 49: TSQL Functions6.1.38 LOGLOG(num)Ret
Page 50 and 51: TSQL Functions6.1.50 PATINDEXPATIND
Page 52 and 53: TSQL Functions6.1.60 RTRIMRTRIM(str
Page 54 and 55: TSQL Functions6.1.72 TANTAN(float)T
Page 57: 7TSQL Variables7.1 Host Variables a
Page 62 and 63: Using the TSQL ShellThe TSQL Shell
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