Retrieve and display a result set using the dynamic sql?

Hi all

How would display a result set in Oracle using the dynamic SQL? Reason being, the table where I'd retrieve and display the result set is a GLOBAL TEMP TABLE created in a stored procedure. If I try to use the loop as usual, the compiler complains that the table does not exist. This makes sense because the compiler does not recognize the table because it is created dynamically. Here is an example:

create or replace PROCEDURE maketemptab IS
sql_stmt VARCHAR2 (500);
OutputString VARCHAR2 (50);

BEGIN
-create temporary table
sql_stmt: = ' CREATE of TABLE TEMPORARY GLOBAL globtemptab (id NUMBER, col1 VARCHAR2 (50))';
EXECUTE IMMEDIATE sql_stmt;
dbms_output.put_line ('... created table ');

-Insert a row into the temporary table
sql_stmt: = "INSERT INTO globtemptab values (1, 'some data of a test')';"
EXECUTE IMMEDIATE sql_stmt;
dbms_output.put_line ('... inserted row ');

-Insert a row into the temporary table
sql_stmt: = ' INSERT INTO globtemptab values (2, "some more test data");
EXECUTE IMMEDIATE sql_stmt;
dbms_output.put_line ('... inserted row ');

-Select the row on temporary table
sql_stmt: = 'SELECT col1 FROM globtemptab WHERE id = 1';
EXECUTE IMMEDIATE sql_stmt INTO outputstring;
dbms_output.put_line ('... selected line: ' | outputstring);

-drop temporary table
sql_stmt: = 'DROP TABLE globtemptab;
EXECUTE IMMEDIATE sql_stmt;
dbms_output.put_line ('... moved table ');

-display the result set
for tabdata loop (select col1 from globtemptab)
dbms_output.put_line ('... test of recovered data are' | tabdata.col1)
end loop;
end;

In short, how to rewrite the SQL below the comment "to display the result set" using the dynamic sql?

Thank you
Amedeo.

Hello

Try this:

CREATE OR REPLACE PROCEDURE maketemptab IS
   sql_stmt     VARCHAR2(500);
   outputstring VARCHAR2(50);
   v_cursor     SYS_REFCURSOR;
   v_col1       VARCHAR2(30);
BEGIN
   -- create temp table
   sql_stmt := 'CREATE GLOBAL TEMPORARY TABLE globtemptab(id NUMBER, col1 VARCHAR2(50))';
   EXECUTE IMMEDIATE sql_stmt;
   dbms_output.put_line('...table created');

   -- insert row into temp table
   sql_stmt := 'INSERT INTO globtemptab values (1, ''some test data'')';
   EXECUTE IMMEDIATE sql_stmt;
   dbms_output.put_line('...row inserted');

   -- insert row into temp table
   sql_stmt := 'INSERT INTO globtemptab values (2, ''some more test data'')';
   EXECUTE IMMEDIATE sql_stmt;
   dbms_output.put_line('...row inserted');

   -- select row from temp table
   sql_stmt := 'SELECT col1 FROM globtemptab WHERE id=1';
   EXECUTE IMMEDIATE sql_stmt
      INTO outputstring;
   dbms_output.put_line('...row selected: ' || outputstring);

   OPEN v_cursor FOR 'SELECT col1 FROM globtemptab';

   LOOP
      FETCH v_cursor
         INTO v_col1;
      EXIT WHEN v_cursor%NOTFOUND;
      dbms_output.put_line('...test data retrieved is' || v_col1);
   END LOOP;
   CLOSE v_cursor;

   -- drop temp table
   sql_stmt := 'DROP TABLE globtemptab';
   EXECUTE IMMEDIATE sql_stmt;
   dbms_output.put_line('...table dropped');
END;
/

Kind regards

Tags: Database

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using the dynamic SQL syntax
I am trying to create a dynamic sql to execute the following statement:

create the table mytbl_20100901 in select * from matbl double;

When I try the following error I
ORA-06550: line 6, column 10:
PLS-00103: encountered the symbol "SELECT" at the expected in the following way:

;;;;;;;;;;;;;;;;;;;;;;;;;;;
declare
sql_cmd varchar2 (1000);

Start

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immediately run sql_cmd;

end;
;;;;;;;;;;;;;;;;;;;;;;;;;

How to fix the sql_cmd assignment statement?

Thank you.
Hello

user1035690 wrote:
I am trying to create a dynamic sql to execute the following statement:

create the table mytbl_20100901 in select * from matbl double;

When I try the following error I
ORA-06550: line 6, column 10:
PLS-00103: encountered the symbol "SELECT" at the expected in the following way:

;;;;;;;;;;;;;;;;;;;;;;;;;;;
declare
sql_cmd varchar2 (1000);

Start

sql_cmd: = select "create table mytbl_ | To_char (sysdate, 'YYYYMMDD') | ' in select * from matbl ' double.

immediately run sql_cmd;

end;
;;;;;;;;;;;;;;;;;;;;;;;;;

How to fix the sql_cmd assignment statement?

Thank you.

The dual table is not necessary a lot in PL/SQL.
You can simply say:
```
sql_cmd := 'create table mytbl_' || TO_CHAR(sysdate, 'YYYYMMDD') || ' as select * from mytbl';
dbms_output.put_line (sql_cmd || ' <= sql_cmd');
-- EXECUTE IMMEDIATE sql_cmd;
```
During the development of the dynamic SQL statements, I suggest that you post the command rather than run it first.
When it seems correct, then a comment instructions EXECUTE IMMEDIATE.
Before the Production code, remove or comment the call to out_line.

Tables created in a stored procedure cannot be used with dynamic SQL? The impact?
There is a thread on the forum which explains how to create tables within a stored procedure (How to create a table in a stored procedure , however, it does create a table as such, but not how to use it (insert, select, update, etc.) the table in the stored procedure.) Looking around and in the light of the tests, it seems that you need to use dynamic SQL statements to execute ddl in a stored procedure in Oracle DB. In addition, it also seems that you cannot use dynamic SQL statements for reuse (insert, select, update, etc.) the table that was created in the stored procedure? Is this really the case?

If this is the case, I am afraid that if tables cannot be 'created and used"in a stored procedure using the dynamic SQL, as is the case with most of the servers of DB dynamic SQL is not a part of the implementation plan and, therefore, is quite expensive (slow). This is the case with Oracle, and if yes what is the performance impact? (Apparently, with Informix, yield loss is about 3 - 4 times, MS SQL - 4 - 5 times and so on).

In summary, tables created within a stored procedure cannot be 'used' with dynamic SQL, and if so, what is the impact of performance as such?

Thank you and best regards,
Amedeo.

Published by: AGF on March 17, 2009 10:51
AGF says:
Hi, Frank.

Thank you for your response. I understand that the dynamic SQL is required in this context.

Unfortunately, I am yet to discover "that seeks to" using temporary tables inside stored procedures. I'm helping a migration from MySQL to Oracle DB, and this was one of the dilemmas encountered. I'll post what is the attempt, when more.

In Oracle, we use [global temporary Tables | http://www.psoug.org/reference/OLD/gtt.html?PHPSESSID=67b3adaeaf970906c5e037b23ed380c2] aka TWG these tables need only be created once everything like a normal table, but they act differently when they are used. The data inserted in TWG will be visible at the session that inserted data, allowing you to use the table for their own temporary needs while not collide with them of all sessions. The data of the TWG will be automatically deleted (if not deleted programmatically) when a) a commit is issued or b) the session ends according to the parameter that is used during the creation of the TWG. There is no real need in Oracle to create tables dynamically in code.

I noticed that many people say that the "Creation of the tables within a stored procedure" is not a good idea, but nobody seems necessarily explain why? Think you could elaborate a little bit? Would be appreciated.

The main reason is that when you come to compile PL/SQL code on the database, all explicit references to tables in the code must correspond to an existing table, otherwise a djab error will occur. This is necessary so that Oracle can validate the columns that are referenced, the data types of those columns etc.. These compilation controls are an important element to ensure that the compiled code is as error free as possible (there is no accounting for the logic of programmers though ;)).

If you start to create tables dynamically in your PL/SQL code, so any time you want to reference this table you must ensure that you write your SQL queries dynamically too. Once you start doing this, then Oracle will not be able to validate your SQL syntax, check the types of data or SQL logic. This makes your code more difficult to write and harder to debug, because inevitably it contains errors. It also means that for example if you want to write a simple query to get that one out in a variable value (which would take a single line of SQL with static tables), you end up writing a dynamic slider all for her. Very heavy and very messy. You also get the situation in which, if you create tables dynamically in the code, you are also likely to drop tables dynamically in code. If it is a fixed table name, then in an environment multi-user, you get in a mess well when different user sessions are trying to determine if the table exists already or is the last one to use so they can drop etc. What headache! If you create tables with table names, then variable Dynamics not only make you a lot end up creating (and falling) of objects on the database, which can cause an overload on the update of the data dictionary, but how can ensure you that you clean the tables, if your code has an exception any. Indeed, you'll find yourself with redundant tables lying around on your database, may contain sensitive data that should be removed.

With the TWG, you have none of these issues.

Also, what is the impact on the performance of the dynamic SQL statements in Oracle? I read some contrasting opinions, some indicating that it is not a lot of difference between static SQL and SQL dynamic in more recent versions of Oracle DB (Re: why dynamic sql is slower than static sql is this true?)

When the query runs on the database, there will be no difference in performance because it is just a request for enforcement in the SQL engine. Performance problems may occur if your dynamic query is not binding variable in the query correctly (because this would cause difficult analysis of the query rather than sweet), and also the extra time, to dynamically write the query running.

Another risk of dynamic query is SQL injection which may result in a security risk on the database.

Good programming will have little need for the tables of dynamically created dynamically or SQL.

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Retrieve and display a result set using the dynamic sql?

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