Updating fetch in plsql
2) Accessing the records in the cursor: Once the cursor is created in the declaration section we can access the cursor in the execution section of the PL/SQL program. If you want to fetch after the last row, the program will throw an error.
or update (select values from table joined to othertable maintaining pk integrity) If you execute that update from pl/sql you can get the sql%rowcount and not have to do the additional select count(*). System design needs to consider both technical and human factors.I'm new to PL/ SQL and have written this function , the intent is to update the column n2Folder Has Contents=" " on the table n0Folder based on a criteria which is evident in the SELECT statement. CREATE OR REPLACE FUNCTION Update False RETURN NUMBER AS false Count NUMBER; folder_row n0Folder%rowtype; CURSOR my Cursor IS select * from global.n0Folder F where F.n2Folder Has Contents = '-' and ( 0 After your Fetch statement, add " exit when mycursor%notfound; "" id="ctl00_m_m_i_ctl00_gr_ctl01_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="4881912" / you have not left out a join condition, so that one of the subqueries is doing a Cartesian product and making it appear to run forever. First, you seem only to be fetching and updating the first row from the query. I also note that you are not actually using any SELECT list item from the cursor.The function itself gets created with no errors, however when I try to call this function it seems to be running forever and the rows don't seem to to get updated. I suspect you want: loop fetch my Cursor into folder Row; exit when my Cursor%NOTFOUND; Update n0Folder set n2Folder Has Contents=' ' where CURRENT OF my Cursor; end loop; commit; close my Cursor; Your false_count := 0 is useless. You may as well make it SELECT 1 rather than SELECT *.Doing what he wanted, including any kind of messaging with lock issues, is easy in Oracle. Regarding "If it can be done in SQL it should be done in SQL" - thank you, Lewis! An explicit cursor is defined in the declaration section of the PL/SQL Block. General Syntax to open a cursor is: When a cursor is opened, the first row becomes the current row.Third, we are opening the cursor in the execution section in line no 8.
Fourth, we are fetching the cursor to the record in line no 9.
a) When we try to open a cursor which is not closed in the previous operation.b) When we try to fetch a cursor after the last operation.
These are the attributes available to check the status of an explicit cursor.
It is created on a SELECT Statement which returns more than one row. General Syntax for creating a cursor is as given below: In the above example we are creating a cursor ‘emp_cur’ on a query which returns the records of all the employees with salary greater than 5000. When the data is fetched it is copied to the record or variables and the logical pointer moves to the next row and it becomes the current row.
Here ‘emp_tbl’ in the table which contains records of all the employees. On every fetch statement, the pointer moves to the next row.
You are correct that a simple UPDATE would be the simplest solution and almost certainly the fastest execution as well.