Is is possible to start and Oracle SQL Procedure with a CTE? - oracle

Question

I have a CTE that I know works, but I want to use it as a procedure so I can parameterize some of the queries within it. Here is the code I tried to run to create the procedure
CREATE OR REPLACE PROCEDURE VATIS_OWNER.getEnvVariables(PF IN VARCHAR, SN IN VARCHAR) AS
BEGIN
--Joins environemt variables from TESTCASES and ENVIRONMENTS tables and transposes result into columns 'ColumnName' and 'ColumnValue' and the ProfileId
--Is used by getAllDynamicData and unioned with results from sp_getProfileDetails
with
cte as (
SELECT
T.TestcaseID,
T.ProfileID,
T.TrustID,
T.DNIS,
T.TESTID,
T.ACDID,
--Must be 8 digits long, so leading 0's are added
SUBSTR(CONCAT('00000000',T.testcaseid),-8, 8) as TestCaseNo,
T.HostId,
E.TFN
FROM TESTCASES T
FULL JOIN ENVIRONMENTS E ON T.ENV_NAME = E.ENV_NAME
--Only returns env vars associated with testcase #SN
where T.TestcaseID = SN
),
cte2 as (
Select A.ProfileID
,B.*
From cte A
--Transpose happens here
Cross Apply ( SELECT 'TestcaseID' AS ColumnName,A.TestcaseID AS ColumnValue FROM DUAL UNION ALL
SELECT 'ProfileID' AS ColumnName,A.ProfileID AS ColumnValue FROM DUAL UNION ALL
SELECT 'TrustID' AS ColumnName,A.TrustID AS ColumnValue FROM DUAL UNION ALL
SELECT 'DNIS' AS ColumnName,SUBSTR(A.DNIS,-7,7) AS ColumnValue FROM DUAL UNION ALL
SELECT 'TESTID' AS ColumnName,A.TESTID AS ColumnValue FROM DUAL UNION ALL
SELECT 'ACDID' AS ColumnName,A.ACDID AS ColumnValue FROM DUAL UNION ALL
SELECT 'TestCaseNo' AS ColumnName,A.TestCaseNo AS ColumnValue FROM DUAL UNION ALL
SELECT 'HostId' AS ColumnName,A.HostId AS ColumnValue FROM DUAL UNION ALL
SELECT 'TFN' AS ColumnName,A.TFN AS ColumnValue FROM DUAL UNION ALL
SELECT 'INVALIDANI' AS ColumnName,SUBSTR(CONCAT(A.TestcaseID ,A.TESTID),-10,10) AS ColumnValue FROM DUAL
) B
)
select distinct * from cte2 where profileID = PF;
END getEnvVariables;
If I replace SN and PF with string values and run just the CTE and query, it works. And an equivalent version works as a Stored Procedure in SQL Server, but when I try to create this procedure in Oracle, I get this compile error:
PLS-00428: an INTO clause is expected in this SELECT statement
Any idea why I can't use this in a procedure? I am more familiar with SQL Server than Oracle, so if I've forgotten something please let me know. Thanks in advance.

Answer 1

If you want to return the select result from this procedure, You have to use a SYS_REFCURSOR as below -
CREATE OR replace PROCEDURE vatis_owner.Getenvvariables(pf IN VARCHAR,
sn IN VARCHAR,
res OUT SYS_REFCURSOR) AS
BEGIN
--Joins environemt variables from TESTCASES and ENVIRONMENTS tables and transposes result into columns 'ColumnName' and 'ColumnValue' and the ProfileId
--Is used by getAllDynamicData and unioned with results from sp_getProfileDetails
OPEN res FOR
WITH cte AS
(
SELECT t.testcaseid,
t.profileid,
t.trustid,
t.dnis,
t.testid,
t.acdid,
--Must be 8 digits long, so leading 0's are added
Substr(Concat('00000000',t.testcaseid),-8, 8) AS testcaseno,
t.hostid,
e.tfn
FROM testcases t
full join environments e
ON t.env_name = e.env_name
--Only returns env vars associated with testcase #SN
WHERE t.testcaseid = sn ), cte2 AS
(
SELECT a.profileid ,
b.*
FROM cte a
--Transpose happens here
cross apply
(
SELECT 'TestcaseID' AS columnname,
a.testcaseid AS columnvalue
FROM dual
UNION ALL
SELECT 'ProfileID' AS columnname,
a.profileid AS columnvalue
FROM dual
UNION ALL
SELECT 'TrustID' AS columnname,
a.trustid AS columnvalue
FROM dual
UNION ALL
SELECT 'DNIS' AS columnname,
substr(a.dnis,-7,7) AS columnvalue
FROM dual
UNION ALL
SELECT 'TESTID' AS columnname,
a.testid AS columnvalue
FROM dual
UNION ALL
SELECT 'ACDID' AS columnname,
a.acdid AS columnvalue
FROM dual
UNION ALL
SELECT 'TestCaseNo' AS columnname,
a.testcaseno AS columnvalue
FROM dual
UNION ALL
SELECT 'HostId' AS columnname,
a.hostid AS columnvalue
FROM dual
UNION ALL
SELECT 'TFN' AS columnname,
a.tfn AS columnvalue
FROM dual
UNION ALL
SELECT 'INVALIDANI' AS columnname,
substr(concat(a.testcaseid ,a.testid),-10,10) AS columnvalue
FROM dual ) b )
SELECT DISTINCT *
FROM cte2
WHERE profileid = pf;
END getenvvariables;
Then later on you can use this proc to return result in a ref_cursor variable.
DECALRE
RES SYS_REFCURSOR;
BEGIN
vatis_owner.Getenvvariables(pf,
sn,
RES);
FOR I IN 1..RES.COUNT LOOP
DBMS_OUTPUT.PUT_LINE(I.YOUR_DESIRED_COLUMNS);
END LOOP;
END;
I can see that you are using CROSS APPLY in your query that means you must be using version 12C or higher. So you can use DBMS_SQL.RETURN_RESULT function -
CREATE OR replace PROCEDURE vatis_owner.Getenvvariables(pf IN VARCHAR,
sn IN VARCHAR) AS
RES SYS_REFCURSOR;
BEGIN
--Joins environemt variables from TESTCASES and ENVIRONMENTS tables and transposes result into columns 'ColumnName' and 'ColumnValue' and the ProfileId
--Is used by getAllDynamicData and unioned with results from sp_getProfileDetails
OPEN RES FOR
WITH cte AS
(
SELECT t.testcaseid,
t.profileid,
t.trustid,
t.dnis,
t.testid,
t.acdid,
--Must be 8 digits long, so leading 0's are added
Substr(Concat('00000000',t.testcaseid),-8, 8) AS testcaseno,
t.hostid,
e.tfn
FROM testcases t
full join environments e
ON t.env_name = e.env_name
--Only returns env vars associated with testcase #SN
WHERE t.testcaseid = sn ), cte2 AS
(
SELECT a.profileid ,
b.*
FROM cte a
--Transpose happens here
cross apply
(
SELECT 'TestcaseID' AS columnname,
a.testcaseid AS columnvalue
FROM dual
UNION ALL
SELECT 'ProfileID' AS columnname,
a.profileid AS columnvalue
FROM dual
UNION ALL
SELECT 'TrustID' AS columnname,
a.trustid AS columnvalue
FROM dual
UNION ALL
SELECT 'DNIS' AS columnname,
substr(a.dnis,-7,7) AS columnvalue
FROM dual
UNION ALL
SELECT 'TESTID' AS columnname,
a.testid AS columnvalue
FROM dual
UNION ALL
SELECT 'ACDID' AS columnname,
a.acdid AS columnvalue
FROM dual
UNION ALL
SELECT 'TestCaseNo' AS columnname,
a.testcaseno AS columnvalue
FROM dual
UNION ALL
SELECT 'HostId' AS columnname,
a.hostid AS columnvalue
FROM dual
UNION ALL
SELECT 'TFN' AS columnname,
a.tfn AS columnvalue
FROM dual
UNION ALL
SELECT 'INVALIDANI' AS columnname,
substr(concat(a.testcaseid ,a.testid),-10,10) AS columnvalue
FROM dual ) b )
SELECT DISTINCT *
FROM cte2
WHERE profileid = pf;
DBMS_SQL.RETURN_RESULT(RES);
END getenvvariables;
When you will run this proc, You will see the result on console. For further information, Please read.