Creating database table in PL/SQL procedure - sql

Question

I am trying to create table with procedure CREATE_TABLE and then insert the information into the created table with procedure PRINT_INFO but I am getting an exception:
Errors: PROCEDURE PRINT_INFO Line/Col: 4/3 PL/SQL: SQL Statement
ignored Line/Col: 4/15 PL/SQL: ORA-00942: table or view does not exist
Errors: PROCEDURE CREATE_TABLE Line/Col: 5/3 PLS-00103: Encountered
the symbol "CREATE" when expecting one of the following:
( begin case declare exit for goto if loop mod null pragma raise
return select update while with << continue close current
delete fetch lock insert open rollback savepoint set sql execute
commit forall merge pipe purge json_exists json_value json_query
json_object json_array
And here is my code example:
CREATE OR REPLACE PROCEDURE PRINT_INFO
IS
BEGIN
INSERT INTO TABLE_T (TABLE_ID, MESSAGE) VALUES (1, 'Hello World!');
END PRINT_INFO;
/
CREATE OR REPLACE PROCEDURE CREATE_TABLE
IS
BEGIN
CREATE TABLE TABLE_T(
TABLE_ID NUMBER NOT NULL,
MESSAGE VARCHAR2(25),
PRIMARY KEY(TABLE_ID)
);
PRINT_INFO;
END CREATE_TABLE;
/
EXEC CREATE_TABLE;
Where could be the problem? How can I get rid of an exception?

Answer 1

Both procedures have to use dynamic SQL:
print_info because it inserts into a table which - at compilation time - doesn't exist yet
create_table because it runs DDL and - in order to do that - you need to use dynamic SQL
Therefore:
SQL> CREATE OR REPLACE PROCEDURE PRINT_INFO
2 IS
3 BEGIN
4 execute immediate q'[INSERT INTO TABLE_T (TABLE_ID, MESSAGE) VALUES (1, 'Hello World!')]';
5 END PRINT_INFO;
6 /
Procedure created.
SQL> CREATE OR REPLACE PROCEDURE CREATE_TABLE
2 IS
3 BEGIN
4 execute immediate 'CREATE TABLE TABLE_T(' ||
5 'TABLE_ID NUMBER NOT NULL, ' ||
6 ' MESSAGE VARCHAR2(25), ' ||
7 ' PRIMARY KEY(TABLE_ID) ' ||
8 ')';
9
10 PRINT_INFO;
11 END CREATE_TABLE;
12 /
Procedure created.
SQL> EXEC CREATE_TABLE;
PL/SQL procedure successfully completed.
SQL> SELECT * FROM table_t;
TABLE_ID MESSAGE
---------- -------------------------
1 Hello World!
SQL>

Answer 2

You have to declare a string and assign your ddl to that variable then use
execute immediate your_variable ;