Is there any way to create such parameter in Java? It is possible to do something like this, but it's a bit fiddly. I've come up with two ways to do this, but both of them rely on being able to create objects in the database. I appreciate you might not have permission to do this.
The bottom line is that the ref cursor object that gets passed into the stored procedure has to be created within the Oracle database itself. We have to put the data in the database somehow and then put a cursor around that. You can't create your own implementation of ResultSet and expect the JDBC driver and database to read data out of that.
This approach involves putting all of the data to insert into a temporary table, and then creating a cursor to select data from that. For this to work we'll need the following to be created in the database:.
It requires the following types to be created in the database feel free to choose better names :. We also need to modify the Row class to implement SQLData : this requires the following three methods to be added:. Without the need to insert data in database. Now I will show how to implement this.
Here is a test working example of code. The example for Oracle:. Learn more. Asked 3 years, 2 months ago. Active 3 years, 2 months ago. Viewed 9k times. Kirill Ch Kirill Ch 3, 1 1 gold badge 29 29 silver badges 54 54 bronze badges.
Active Oldest Votes. Luke Woodward Luke Woodward It seems a very good answer, now something becomes clear for me. Thanks, I will try these approaches. I suspect that actual cursor that I should pass to my procedure you can get by ResultSet stmt. It is possible to add getting the cursor in the answer? I see that you sugest to save data to the database in java and then give Oracle to pass cursor to the procedure, right?
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Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Making the most of your one-on-one with your manager or other leadership. Podcast The story behind Stack Overflow in Russian. Featured on Meta. Linked 3. Related Stored procedures are stored inside the database.
They define a programming interface for the database rather than allowing the client application to interact with database objects directly. Stored procedures are typically used for data validation or to encapsulate large, complex processing instructions that combine several SQL queries. Stored functions have a single return value parameter. Unlike functions, procedures may or may not return values. A package is composed of two distinct pieces:. The specification defines all public items.
The specification is the published interface to a package. The package body contains the code for the procedures and functions defined in the specification, and the code for private procedures and functions that are not declared in the specification. This private code is only visible within the package body. While it is possible to have a specification without a body, as when declaring a set of public constants, it is not possible to have a body with no specification. NET class. Note that data is not be retrieved until the user attempts to read it.
If you have not previously saved the password, the Oracle Server Login opens and you can enter the password now. If you have saved the password, then the connection expands immediately. Under the Parameter Details group on the right, enter these three parameters.
Click Add before each parameter that you need to add.
PL/SQL Parameterized Cursors
A Preview SQL window appears, containing code similar to the following. Note that this code has been abbreviated by removing most of the comments. The Parameter Details area appears, showing the employees in department This section demonstrates how to modify your Oracle Data Provider for. Make a copy of Form3.
In the Form1 window, enter the connection information, and click Connect. Description of the illustration procedure1. Under the Methods area, click Add. Description of the illustration procedure2.The parameterized cursors are the further extension to the explicit cursors having IN type parameters for limiting the number of rows processed by the cursor associated SELECT statement while opening them.
The two types of parameterized cursors are. These types of cursors do not have any return type and are generally used in procedures, functions and anonymous blocks which are not encapsulated within a package.
When the cursor is opened with an employee ID as its parameter value, it acts as a row limiter and returns only the row set corresponding to that particular employee ID, which is then fetched and processed, instead of processing all the employees as shown below. CLOSE cur. This nested type then acts as the data type of the cursor input parameter and the list of employee IDs passed as its input limits the number of rows returned by the SELECT statement during the cursor OPEN operation as shown in the below code listing.
Basically, all the rows from the SELECT statement are taken into the context area initially and the input parameter just limits out a certain number row during the OPEN operation, which is then fetched and processed.
These cursors have a return type and are primarily used in procedures, functions and anonymous blocks which are encapsulated within a package. The return type serves no other purpose than letting its calling environment know its structure from its package specification while hiding its business complexities and rules in its body. The below package specification shows the parameterized cursor, its return type and the procedure header information that is sufficient for a calling environment to call them.
The record set opened by the cursor is then fetched and processed using a simple loop as shown in the below example. The procedure can be called by passing a list of employee first names as shown below.
Employee ID: Employee Name: Hunold, Alexander. Employee Name: Khoo, Alexander. Employee Name: King, Janette. Employee Name: Hartstein, Michael. Employee Name: Rogers, Michael. Employee Name: Ande, Sundar. Employee Name: Gietz, William. Employee Name: Smith, William. You can get personalized Oracle training by Donald Burleson, right at your shop! Burleson is the American Team Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.
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Oracle technology is changing and we strive to update our BC Oracle support information. If you find an error or have a suggestion for improving our content, we would appreciate your feedback. All rights reserved by Burleson.A cursor is passed a parameter in very much the same way a procedure is passed a parameter except that the parameter can only be IN mode. Like the procedure, the cursor definition will declare an unconstrained datatype for the passed variable.
The cursor above is defined as accepting a parameter with a datatype of varchar2. The results returned in this example are the same as the previous example and to save space were omitted. Let's close with one final note about cursors. This example was used to demonstrate nested cursors and passing parameters to cursors.
And then it could have use a loop to process the results. This method would be even more efficient as it would execute only one query against the database. So far we have manually controlled the cursor and there is many times when you want that level of control. However, Oracle has provided a streamlined method of using cursors with a FOR loop. You can get personalized Oracle training by Donald Burleson, right at your shop! Burleson is the American Team Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.
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If you find an error or have a suggestion for improving our content, we would appreciate your feedback. All rights reserved by Burleson. Search BC Oracle Sites.I have read that using them allows better resource sharing. Regards Andrew and we said They are identical, those two cursor definitions are the same. In theory -- the cursor c1 in the package could be reused more often because procedure p1, p2, p3, I personally am not a huge fan of the package approach.
If you use this you have to remember that for example P1, P3, P5 and P7 use it. It becomes a shared resource and you have these implicit dependencies between these bits of code.
I would rather let each have their own cursor and avoid such situations. I use implicit cursors -- the last one you have there, the cursor for loop, whenever I can. Meaning the only time I have an explicit cursor is when I am forced to use a ref cursor. You can also catch regular content via Connor's blog and Chris's blog.
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Questions use of cursor parameters. Question and Answer. Latest Followup. You Asked Tom Please could you provide guidelines on the use of cursor parameters. Regards Andrew. Write a Review. Thanks for clarifying cursor parameters.
PL/SQL Cursor with Parameters
I haven't seen in for loop implicit cursor before. I have read in one of your forums where you mention about using an appliaction context along with a ref cursor for these kind of situations The question is if i can make use of ref cursor for these type of scenarios Thanks in advance Sriram.
Hi tom Thanks for the information I was wrong in saying that the where clause changes. I am still not clear whether a ref cursor can be used in these kind of scenarios? If yes what are the pros and cons I have a query where I am joining two table say A and B. Can I use Parametrized cursors for substituting values in where clause only? If yes, please tell h ow can I create a join query where value of one of the table is decided at runtime.
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