Example of MOVE a cursor without fetching data MOVErepositions a cursor without retrieving any data and works such as theFETCHcommand, except it only repositions the cursor in the dataset and doesn’t return the
address%type; CURSOR c_customers is SELECT id, name, address FROM customers; BEGIN OPEN c_customers; LOOP FETCH c_customers into c_id, c_name, c_addr; EXIT WHEN c_customers%notfound; dbms_output.put_line(c_id || ' ' || c_name || ' ' || c_addr); END LOOP; CLOSE c_...
FOR b_zip IN a_zip LOOP cur_zip := b_zip.zip; DBMS_OUTPUT.PUT_LINE (CHR(10)); DBMS_OUTPUT.PUT_LINE ('Customers living in '|| b_zip.city); FOR b_customer in cur1_customer LOOP DBMS_OUTPUT.PUT_LINE (b_customer.first_name|| ' '||b_customer.last_name); END...
To calculate the win/lose streak, we begin with the latest (and the first in the dataset) match data. When a cursor is opened, it always starts at the first record in the associated dataset. After the first data is grabbed, the cursor will move to the next record. In this way, a ...
DBMS_OUTPUT.put_line( 'Employee ' || nemployeeid || 'had job ' || sjobid || ' for ' || (denddate - dstartdate) || ' days.'); END LOOP; CLOSE curjob; END; / Same example is given below for explicit cursor but with For Loop, the For Loop cursors are more smart as the...
Next, we can enhance the access control of the SP as described in my previous article. To test the output of this SP, we will write a short PHP script: <?php $dbms = 'mysql'; $host = 'localhost'; $db = 'sitepoint'; $user = 'root'; $pass = 'your_pass_here'; $dsn = "...
Oracle 11g allows the two-way conversion between ref cursors toDBMS_SQLcursors, as describedhere. 12c Updates Oracle 12c allows implicit statements results, similar to that seen in Transact-SQL, as describedhere. For more information see:
A cursor can’t be used by itself in MySQL. It is an essential component in stored procedures. I would be inclined to treat a cursor as a “pointer” in C/C++, or an iterator in PHP’sforeachstatement. With cursors, we can traverse a dataset and manipulate each record to accomplish ...
dbms_ouput.put_line(stud_name || ' ' || stud_address || ' ' || stud_percentage); END LOOP; CLOSE stud; END / Cursor Actions Unlike SQL which works on all the rows in a result set at a time, the cursor is mainly used in the scenarios when the programmer wants to process and...
Sometimes this could (seem to) be helpful, but when working with databases, you shouldn’t use procedural programming patterns but rather stick to declarative programming. One of the main reasons is that DBMSs are already optimized to perform actions on sets of data, and therefore you shouldn’...