Updating a view in plsql
Once we open a cursor having a FOR UPDATE clause, all the rows returned by the SELECT statement are locked for our changes until a commit or a rollback is placed to release the lock.
After a TCL operation is performed, the cursor pointer gets reset and the cursor will be no longer accessible, thus results in an error when fetched further as shown below.
Rows Only does not seem to work with the FOR UPDATE clause.
When the Fetch clause is used with a cursor having a FOR UPDATE clause, the PL/SQL unit fails when we try to open the cursor with an ORA-02014: cannot select FOR UPDATE from view with DISTINCT, GROUP BY, etc. The error description shows that the internal mechanism for the Fetch clause uses either a DISTINCT or a GROUP BY clause which is not permitted alongside the FOR UPDATE clause.
Data Definition Language (DDL) commands perform an implicit commit, which also confirms all outstanding DML changes in the current session.If you decide you don't want to keep some uncommitted changes, you can throw them away using using the It's possible to update the base table associated with a view.There are some restrictions associated with this, but they are a little out of scope for a beginner level article.In the following example, we create a simple view on the EMPLOYEES table, then update via it.SET SERVEROUTPUT ON BEGIN UPDATE employees SET salary = 10000 WHERE employee_id = 9999; DBMS_OUTPUT.put_line('NO_DATA_FOUND Not Raised'); EXCEPTION WHEN NO_DATA_FOUND THEN DBMS_OUTPUT.put_line('NO_DATA_FOUND Raised'); END; / NO_DATA_FOUND Not Raised PL/SQL procedure successfully completed.
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--DROP TABLE employees PURGE; --DROP TABLE departments PURGE; CREATE TABLE departments ( department_id NUMBER(2) CONSTRAINT departments_pk PRIMARY KEY, department_name VARCHAR2(14), location VARCHAR2(13) ); INSERT INTO departments VALUES (10,'ACCOUNTING','NEW YORK'); INSERT INTO departments VALUES (20,'RESEARCH','DALLAS'); INSERT INTO departments VALUES (30,'SALES','CHICAGO'); INSERT INTO departments VALUES (40,'OPERATIONS','BOSTON'); COMMIT; CREATE TABLE employees ( employee_id NUMBER(4) CONSTRAINT employees_pk PRIMARY KEY, employee_name VARCHAR2(10), job VARCHAR2(9), manager_id NUMBER(4), hiredate DATE, salary NUMBER(7,2), commission NUMBER(7,2), department_id NUMBER(2) CONSTRAINT emp_department_id_fk REFERENCES departments(department_id) ); INSERT INTO employees VALUES (7369,'SMITH','CLERK',7902,to_date('','dd-mm-yyyy'),800, NULL,20); INSERT INTO employees VALUES (7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30); INSERT INTO employees VALUES (7521,'WARD','SALESMAN',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30); INSERT INTO employees VALUES (7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975, NULL,20); INSERT INTO employees VALUES (7654,'MARTIN','SALESMAN',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30); INSERT INTO employees VALUES (7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850, NULL,30); INSERT INTO employees VALUES (7782,'CLARK','MANAGER',7839,to_date('9-6-1981','dd-mm-yyyy'),2450, NULL,10); INSERT INTO employees VALUES (7788,'SCOTT','ANALYST',7566,to_date('13-JUL-87','dd-mm-rr')-85,3000, NULL,20); INSERT INTO employees VALUES (7839,'KING','PRESIDENT', NULL,to_date('','dd-mm-yyyy'),5000, NULL,10); INSERT INTO employees VALUES (7844,'TURNER','SALESMAN',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30); INSERT INTO employees VALUES (7876,'ADAMS','CLERK',7788,to_date('13-JUL-87', 'dd-mm-rr')-51,1100, NULL,20); INSERT INTO employees VALUES (7900,'JAMES','CLERK',7698,to_date('3-12-1981','dd-mm-yyyy'),950, NULL,30); INSERT INTO employees VALUES (7902,'FORD','ANALYST',7566,to_date('3-12-1981','dd-mm-yyyy'),3000, NULL,20); INSERT INTO employees VALUES (7934,'MILLER','CLERK',7782,to_date('23-1-1982','dd-mm-yyyy'),1300, NULL,10); COMMIT; These tables are a variant of the EMP and DEPT tables from the SCOTT schema.
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