SQL script: dynamic table creation

Question

Hello,
I should write a sql script to do the following (simplified):
- Create a table if it doesn't exist yet
- Select something from the newly created table and do further conditional actions
I've tried something like that:
DECLARE
lv_count INTEGER;
BEGIN
DBMS_OUTPUT.enable();
SELECT COUNT(*) INTO lv_count FROM user_tables WHERE table_name = 'DATABASEINFO';
IF(lv_count = 0)
THEN
     DBMS_OUTPUT.PUT_LINE('Create DatabaseInfo');
EXECUTE IMMEDIATE
     'CREATE TABLE DATABASEINFO(
          ZDatabaseInfoId RAW(16) NOT NULL,
          ZInfo VARCHAR2(30) NOT NULL,
          ZValue VARCHAR2(100) NOT NULL,
CONSTRAINT DatabaseInfo_U_NC_PK PRIMARY KEY
ZDatabaseInfoId
END IF;
SELECT COUNT(*) INTO lv_count FROM DatabaseInfo WHERE ZInfo = 'anything';
The select statement fails with error message "Table or view cannot be found". As far as I know, this is because the table is created dynamically and validation of the sql script fails because the table doesn't exist on compile time.
How to solve that?
Best Regards
Andreas

Answer 1

866121 wrote:
Hello,
I should write a sql script to do the following (simplified):
- Create a table if it doesn't exist yet
- Select something from the newly created table and do further conditional actions
I've tried something like that:
DECLARE
lv_count INTEGER;
BEGIN
DBMS_OUTPUT.enable();
SELECT COUNT(*) INTO lv_count FROM user_tables WHERE table_name = 'DATABASEINFO';
IF(lv_count = 0)
THEN
     DBMS_OUTPUT.PUT_LINE('Create DatabaseInfo');
EXECUTE IMMEDIATE
     'CREATE TABLE DATABASEINFO(
          ZDatabaseInfoId RAW(16) NOT NULL,
          ZInfo VARCHAR2(30) NOT NULL,
          ZValue VARCHAR2(100) NOT NULL,
CONSTRAINT DatabaseInfo_U_NC_PK PRIMARY KEY
ZDatabaseInfoId
END IF;
SELECT COUNT(*) INTO lv_count FROM DatabaseInfo WHERE ZInfo = 'anything';
The select statement fails with error message "Table or view cannot be found". As far as I know, this is because the table is created dynamically and validation of the sql script fails because the table doesn't exist on compile time.
How to solve that?
why, oh why, are you dynamically making table?
DDL should be done only once via static SQL.
dig a deeper hole & EXECUTE IMMEDIATE the SELECT.