Pl Sql Close Cursor Error
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shot at without result. —Winston Churchill Run-time errors arise from design faults, coding mistakes, hardware failures, and many other sources. Although you cannot anticipate all possible errors,
Pl Sql Cursor Example
you can plan to handle certain kinds of errors meaningful to your pl sql cursor loop PL/SQL program. With many programming languages, unless you disable error checking, a run-time error such as stack overflow or open cursor oracle division by zero stops normal processing and returns control to the operating system. With PL/SQL, a mechanism called exception handling lets you "bulletproof" your program so that it can continue operating in
Oracle Cursor For Loop Fetch
the presence of errors. This chapter contains these topics: Overview of PL/SQL Runtime Error Handling Advantages of PL/SQL Exceptions Summary of Predefined PL/SQL Exceptions Defining Your Own PL/SQL Exceptions How PL/SQL Exceptions Are Raised How PL/SQL Exceptions Propagate Reraising a PL/SQL Exception Handling Raised PL/SQL Exceptions Tips for Handling PL/SQL Errors Overview of PL/SQL Compile-Time Warnings Overview of PL/SQL Runtime Error Handling In
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PL/SQL, an error condition is called an exception. Exceptions can be internally defined (by the runtime system) or user defined. Examples of internally defined exceptions include division by zero and out of memory. Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR. The other internal exceptions can be given names. You can define exceptions of your own in the declarative part of any PL/SQL block, subprogram, or package. For example, you might define an exception named insufficient_funds to flag overdrawn bank accounts. Unlike internal exceptions, user-defined exceptions must be given names. When an error occurs, an exception is raised. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram. Internal exceptions are raised implicitly (automatically) by the run-time system. User-defined exceptions must be raised explicitly by RAISE statements, which can also raise predefined exceptions. To handle raised exceptions, you write separate routines called exception handlers. After an exception handler runs, the current block stops executing and the enclosing block resumes with the next statement. If there is no enclosing block, control returns to the host env
a cursor variable, you can implicit cursor reopen it with the OPEN FOR statement. You need not close a cursor variable https://docs.oracle.com/cd/B13789_01/appdev.101/b10807/07_errs.htm before reopening it. Topics Syntax Semantics Examples Related Topics Syntax close_statement ::= Description of the illustration close_statement.gif Semantics cursor Name of an open explicit cursor. cursor_variable Name of https://docs.oracle.com/cloud/latest/db112/LNPLS/close_statement.htm an open cursor variable. :host_cursor_variable Name of a cursor variable declared in a PL/SQL host environment and passed to PL/SQL as a bind variable. Do not put space between the colon (:) and host_cursor_variable. Examples Example 6-6, "FETCH Statements Inside LOOP Statements" Related Topics In this chapter: "FETCH Statement" "OPEN Statement" "OPEN FOR Statement" In other chapters: "Opening and Closing Explicit Cursors" "Opening and Closing Cursor Variables" Scripting on this page enhances content navigation, but does not change the content in any way.
| PL/SQL Explicit Cursors Explicit Cursors An explicit cursor is defined in the declaration section of the PL/SQL Block. It is created on a SELECT Statement which returns more than one row. http://plsql-tutorial.com/plsql-explicit-cursors.htm We can provide a suitable name for the cursor. General Syntax for creating a cursor is as given below: CURSOR cursor_name IS select_statement; cursor_name – A suitable name for the cursor. select_statement – A select query which returns multiple rows. How to use Explicit Cursor? There are four steps in using an Explicit Cursor. DECLARE the cursor in the declaration section. OPEN the pl sql cursor in the Execution Section. FETCH the data from cursor into PL/SQL variables or records in the Execution Section. CLOSE the cursor in the Execution Section before you end the PL/SQL Block. 1) Declaring a Cursor in the Declaration Section: DECLARE CURSOR emp_cur IS SELECT * FROM emp_tbl WHERE salary > 5000; In the above example we are creating a cursor ‘emp_cur’ on a pl sql cursor query which returns the records of all the employees with salary greater than 5000. Here ‘emp_tbl’ in the table which contains records of all the employees. 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. How to access an Explicit Cursor? These are the three steps in accessing the cursor. 1) Open the cursor. 2) Fetch the records in the cursor one at a time. 3) Close the cursor.
General Syntax to open a cursor is: OPEN cursor_name; General Syntax to fetch records from a cursor is: FETCH cursor_name INTO record_name; OR FETCH cursor_name INTO variable_list; General Syntax to close a cursor is: CLOSE cursor_name; When a cursor is opened, the first row becomes the current row. 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. On every fetch statement, the pointer moves to the next row. If you want to fetch after the last row, the program will throw