To centralize data retrieval, you can group type-compatible queries in a stored procedure. For example, two UPDATE statements might credit one bank account and debit another. For each column value returned by the query associated with the cursor, there must be a corresponding, type-compatible variable in the INTO list. To do so, you must resume the main transaction by exiting the autonomous routine. I guess number of columns returned by ref cursor might not matched the number of columns inside cursorRecordObj type. Example 6-22 displays the wages paid to employees earning over a specified wage in a specified department. The SELECT statement for the query can be coded directly in the statement, or can be a string variable or string literal. Example 6-34 Declaration of Cursor Variables in a Package. Reread my last reply to OP paying particular attention to this: Software in Silicon (Sample Code & Resources). Application development tools such as Oracle Forms, which have a PL/SQL engine, can use cursor variables entirely on the client side. Line 25. Suppose you want to track all inserts into a table, even those that roll back.

You can pass different numbers of actual parameters to a cursor, accepting or overriding the default values as you please. A simple rollback or commit erases all savepoints. When appended to the cursor or cursor variable name, these attributes return useful information about the execution of a SQL statement. PL/SQL raises an exception if you try to fetch from a FOR UPDATE cursor after doing a commit. DECLARE CURSOR guru99_det IS SELECT emp_name FROM emp; TYPE lv_emp_name_tbl IS TABLE OF VARCHAR2(50); lv_emp_name lv_emp_name_tbl; BEGIN OPEN guru99_det; FETCH guru99_det BULK COLLECT INTO lv_emp_name LIMIT 5000; FOR c_emp_name IN lv_emp_name.FIRST .. lv_emp_name.LAST LOOP Dbms_output.put_line(‘Employee Fetched:‘||c_emp_name); END LOOP: … This technique is also useful for multi-language applications, where a PL/SQL subprogram might return a result set to a subprogram written in a different language, such as Java or Visual Basic. Example 6-27 Passing a REF CURSOR as a Parameter. Changes made by an autonomous transaction become visible to other transactions when the autonomous transaction commits.

Remember, autonomous transactions are fully independent of the main transaction.

Example 6-33 Fetching from a Cursor Variable into Collections.

To use the cursor variable, you must pass it as a host variable to PL/SQL. The savepoint to which you roll back is not erased. To detect the failure, use the cursor attribute %FOUND or %NOTFOUND. To define autonomous transactions, you use the pragma (compiler directive) AUTONOMOUS_TRANSACTION.

After creating a sequence, you can use it to generate unique sequence numbers for transaction processing. Tests whether a character string matches a specified pattern, which can include wildcards. DECLARE TYPE EmpCurTyp IS REF CURSOR; TYPE NumList IS TABLE OF NUMBER; TYPE NameList IS TABLE OF VARCHAR2(25); emp_cv EmpCurTyp; empids NumList; enames NameList; sals NumList; BEGIN OPEN emp_cv FOR 'SELECT employee_id, last_name FROM employees'; FETCH emp_cv BULK COLLECT INTO empids, enames; CLOSE emp_cv; END; /. In a SELECT statement that is not nested in any other query expression, except when it is a subquery of the cursor expression itself. Connor and Chris don't just spend all day on AskTOM. Cursors and variables follow the same scoping rules. Example 6-45 marks a PL/SQL block as autonomous. If you want to fetch across commits, use the ROWID pseudocolumn to mimic the CURRENT OF clause. You use them when you want to perform a query in one subprogram, and process the results in a different subprogram (possibly one written in a different language). Any variables in the associated query are evaluated only when the cursor variable is opened.

Whether you issue the commit or rollback in your PL/SQL program or from a client program depends on the application logic.

Summary: in this tutorial, you will learn about PL/SQL cursor variables and how to manage cursors variables using REF CURSOR.. Introduction to PL/SQL cursor variables. Using these statements in Oracle database greatly reduces the number of environment switching between PL/SQL and SQL statement execution engine, thus greatly improving its performance.

Oracle closes the SQL cursor automatically after executing its associated SQL statement.

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To centralize data retrieval, you can group type-compatible queries in a stored procedure. For example, two UPDATE statements might credit one bank account and debit another. For each column value returned by the query associated with the cursor, there must be a corresponding, type-compatible variable in the INTO list. To do so, you must resume the main transaction by exiting the autonomous routine. I guess number of columns returned by ref cursor might not matched the number of columns inside cursorRecordObj type. Example 6-22 displays the wages paid to employees earning over a specified wage in a specified department. The SELECT statement for the query can be coded directly in the statement, or can be a string variable or string literal. Example 6-34 Declaration of Cursor Variables in a Package. Reread my last reply to OP paying particular attention to this: Software in Silicon (Sample Code & Resources). Application development tools such as Oracle Forms, which have a PL/SQL engine, can use cursor variables entirely on the client side. Line 25. Suppose you want to track all inserts into a table, even those that roll back.

You can pass different numbers of actual parameters to a cursor, accepting or overriding the default values as you please. A simple rollback or commit erases all savepoints. When appended to the cursor or cursor variable name, these attributes return useful information about the execution of a SQL statement. PL/SQL raises an exception if you try to fetch from a FOR UPDATE cursor after doing a commit. DECLARE CURSOR guru99_det IS SELECT emp_name FROM emp; TYPE lv_emp_name_tbl IS TABLE OF VARCHAR2(50); lv_emp_name lv_emp_name_tbl; BEGIN OPEN guru99_det; FETCH guru99_det BULK COLLECT INTO lv_emp_name LIMIT 5000; FOR c_emp_name IN lv_emp_name.FIRST .. lv_emp_name.LAST LOOP Dbms_output.put_line(‘Employee Fetched:‘||c_emp_name); END LOOP: … This technique is also useful for multi-language applications, where a PL/SQL subprogram might return a result set to a subprogram written in a different language, such as Java or Visual Basic. Example 6-27 Passing a REF CURSOR as a Parameter. Changes made by an autonomous transaction become visible to other transactions when the autonomous transaction commits.

Remember, autonomous transactions are fully independent of the main transaction.

Example 6-33 Fetching from a Cursor Variable into Collections.

To use the cursor variable, you must pass it as a host variable to PL/SQL. The savepoint to which you roll back is not erased. To detect the failure, use the cursor attribute %FOUND or %NOTFOUND. To define autonomous transactions, you use the pragma (compiler directive) AUTONOMOUS_TRANSACTION.

After creating a sequence, you can use it to generate unique sequence numbers for transaction processing. Tests whether a character string matches a specified pattern, which can include wildcards. DECLARE TYPE EmpCurTyp IS REF CURSOR; TYPE NumList IS TABLE OF NUMBER; TYPE NameList IS TABLE OF VARCHAR2(25); emp_cv EmpCurTyp; empids NumList; enames NameList; sals NumList; BEGIN OPEN emp_cv FOR 'SELECT employee_id, last_name FROM employees'; FETCH emp_cv BULK COLLECT INTO empids, enames; CLOSE emp_cv; END; /. In a SELECT statement that is not nested in any other query expression, except when it is a subquery of the cursor expression itself. Connor and Chris don't just spend all day on AskTOM. Cursors and variables follow the same scoping rules. Example 6-45 marks a PL/SQL block as autonomous. If you want to fetch across commits, use the ROWID pseudocolumn to mimic the CURRENT OF clause. You use them when you want to perform a query in one subprogram, and process the results in a different subprogram (possibly one written in a different language). Any variables in the associated query are evaluated only when the cursor variable is opened.

Whether you issue the commit or rollback in your PL/SQL program or from a client program depends on the application logic.

Summary: in this tutorial, you will learn about PL/SQL cursor variables and how to manage cursors variables using REF CURSOR.. Introduction to PL/SQL cursor variables. Using these statements in Oracle database greatly reduces the number of environment switching between PL/SQL and SQL statement execution engine, thus greatly improving its performance.

Oracle closes the SQL cursor automatically after executing its associated SQL statement.

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