Updating the records in to the cursor Free onlinesex webcam
In this scenario, the cursor result set can be limited using the traditional When we associate a SELECT statement with more than one table joined together to a cursor with a FOR UPDATE clause, we end up locking all the tables in the FROM clause of the SELECT statement, where we just need to lock a single table for our purpose.
The cursor places a lock on the data that will remain until either the script completes or the update cursor object is deleted.import arcpy fc = "c:/data/base.gdb/roads" field1 = "field1" field2 = "field2" cursor = arcpy.
When we want to update or delete the cursor fetched row(s) from the database, we don’t have to form In the below code listing, the employees joined before the year 2000 are archived and during the cursor process, no other session is permitted to make any changes to those employees using the FOR UPDATE clause.
The employee deletion from the transaction table is performed using the WHERE CURRENT OF clause as shown below.
In the below example, the cursor CUR is associated with a SELECT statement having the tables EMPLOYEES and joined in its FROM clause. EMPLOYEE_ID clause in the below snippet locks up only rows of the EMPLOYEES table, thus making the DEPARTMENTS table available for modification to the other session users. For this, the cursor CUR is associated with a SELECT statement joining the EMPLOYEES and the DEPARTMENTS tables with a FOR UPDATE OF clause on the employee ID.
When we try to update the salary column of the EMPLOYEES table using the WHERE CURRENT OF clause, the block fails with an ORA-01410: invalid ROWID error as there is no way to specify the This scenario can be manhandled by fetching the rowid of the intended table in the cursor associated SELECT statement and using it in the WHERE clause of the DELETE or the UPDATE statement instead of the WHERE CURRENT OF clause as shown in the below listing. For complete notes on programming in PL/SQL, we recommend the book Advanced PL/SQL: The Definitive Reference by Boobal Ganesan.