Oracle Forms: Data Blocks on Different Sources

Dec 4, 2015Download as ppt, pdf

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This document discusses different data sources for data blocks, including FROM clause queries, stored procedures returning REF cursors or tables of records, and transactional triggers. FROM clause queries allow dynamic views without defining a new view, while stored procedures increase control and security and allow complex queries or DML across multiple tables. Guidelines recommend using FROM clause queries for dynamic views and stored procedures for increased functionality like specifying queries at runtime or performing validation and DML on the server.

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Objectives
• Base a data block on FROM clause sub query
• Base a data block on a stored procedure
• Return a REF cursor from a stored procedure
• Return a table of records from a stored procedure
• Select the appropriate data source for a
data block

Data source Types
A/C No:
Branch:
Balance:
A/C No:
Branch:
Balance:
TableTable
Transactional
trigger
Transactional
trigger
FROM clause
query
Stored
procedure
Query DML
Stored
procedure

Basing Data Block on a From Clause Query
SELECT deptno, Total_salary
FROM (SELECT deptno,
sum(sal) Total_salary
FROM emp
GROUP BY deptno)
WHERE total_salary>=8000

Why Form Clause Query?
Perform joins, lookups, and calculations on the server (thus avoiding
multiple network trips) without having to define a view every time.
• Improves developer productivity
• Reduces the burden on the DBA
• Improves performance

Basing a Data block on Stored Procedure for
Query Operation
Return data by way of:
• REF cursor
• A Table of records
Procedure
MARTIN
Empno Ename Job
7369 SMITH CLERK
7499 ALLEN SALESMAN
7521 WARD SALESMAN
7566 JONES ANAGER
7654 SALESMAN
7698 BLAKE MANAGER
7782 CLARK MANAGER
Querying
Emp No
Name
Job
Data Block

Basing a Data block on Stored Procedure for
DML Operations
• Return data by way of a table of records
Procedure
MARTIN
Empno Ename Job
7369 SMITH CLERK
7499 ALLEN SALESMAN
7521 WARD SALESMAN
7566 JONES ANAGER
7654 SALESMAN
7698 BLAKE MANAGER
7782 CLARK MANAGER
Updating
Emp No
Name
Job
Data Block

REF Cursor Procedure for Query
Define a package specification with:
• The objects returned by the REF cursor
• The REF cursor
• The query procedure: Data returned
through the first argument (IN OUT)
Define a package body: Write the code for
the query procedure

Table of Records Procedure for Query
Define a package specification with:
• The structure of each row of the table
• The table of records
• The query procedure: Data returned through the first argument (IN
OUT)
Define a package body: Write the code for the
query procedure

Table of Records Procedure for DML
Define a package specification with:
• The structure of each row of the table
• The table of records
• A procedure to insert rows
• A procedure to update rows
• A procedure to delete rows
• A procedure to lock rows
Define a package body by writing the code for
each DML procedure

Returning a Ref Cursor
Query
Fetched rows
REF cursor
REF cursor
Procedure
SQL
SELECT
21
3
4
Emp No
Name
Job

Returning Table of Records
Query
Table of Records
Cursor
Cursor
Procedure
Any
PL/SQL
Code
21
3
4
Emp No
Name
Job

Data Block Wizard
Use the Data Block Wizard to specify the following:
• Data source type
• Query procedure
• Insert procedure
• Update procedure
• Delete procedure
• Lock procedure

Data Source Guidelines
Base a data block on a FROM clause query to:
• Create a “dynamic” view
Base a data block on a stored procedure to:
• Increase control and security
• Specify a SELECT statement at run time
• Query or update multiple tables
• Perform complex computations
• Perform validation and DML on the
server side

Data Source Guidelines
Query
YES
YES
YES
YES
YES
YES
Data Source
Table
View
FROM Clause
Proc-Ref Cur
Proc-Table Rec
Transac. Trigger
DML
YES
YES
NO
NO
YES
YES

Summary
• Base data blocks on new data sources:
– FROM clause query (query only)
– Stored procedure (query and DML)
• Exploit features of stored procedures :
– REF cursors
limited to a single SELECT statement
– Table of records
can be a complex procedure

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Oracle Forms: Data Blocks on Different Sources

1. Data Blocks on Different Data Sources

2. Objectives • Base a data block on FROM clause sub query • Base a data block on a stored procedure • Return a REF cursor from a stored procedure • Return a table of records from a stored procedure • Select the appropriate data source for a data block

3. Data source Types A/C No: Branch: Balance: A/C No: Branch: Balance: TableTable Transactional trigger Transactional trigger FROM clause query Stored procedure Query DML Stored procedure

4. Basing Data Block on a From Clause Query SELECT deptno, Total_salary FROM (SELECT deptno, sum(sal) Total_salary FROM emp GROUP BY deptno) WHERE total_salary>=8000

5. Why Form Clause Query? Perform joins, lookups, and calculations on the server (thus avoiding multiple network trips) without having to define a view every time. • Improves developer productivity • Reduces the burden on the DBA • Improves performance

6. Basing a Data block on Stored Procedure for Query Operation Return data by way of: • REF cursor • A Table of records Procedure MARTIN Empno Ename Job 7369 SMITH CLERK 7499 ALLEN SALESMAN 7521 WARD SALESMAN 7566 JONES ANAGER 7654 SALESMAN 7698 BLAKE MANAGER 7782 CLARK MANAGER Querying Emp No Name Job Data Block

7. Basing a Data block on Stored Procedure for DML Operations • Return data by way of a table of records Procedure MARTIN Empno Ename Job 7369 SMITH CLERK 7499 ALLEN SALESMAN 7521 WARD SALESMAN 7566 JONES ANAGER 7654 SALESMAN 7698 BLAKE MANAGER 7782 CLARK MANAGER Updating Emp No Name Job Data Block

8. REF Cursor Procedure for Query Define a package specification with: • The objects returned by the REF cursor • The REF cursor • The query procedure: Data returned through the first argument (IN OUT) Define a package body: Write the code for the query procedure

9. Table of Records Procedure for Query Define a package specification with: • The structure of each row of the table • The table of records • The query procedure: Data returned through the first argument (IN OUT) Define a package body: Write the code for the query procedure

10. Table of Records Procedure for DML Define a package specification with: • The structure of each row of the table • The table of records • A procedure to insert rows • A procedure to update rows • A procedure to delete rows • A procedure to lock rows Define a package body by writing the code for each DML procedure

11. Returning a Ref Cursor Query Fetched rows REF cursor REF cursor Procedure SQL SELECT 21 3 4 Emp No Name Job

12. Returning Table of Records Query Table of Records Cursor Cursor Procedure Any PL/SQL Code 21 3 4 Emp No Name Job

13. Data Block Wizard Use the Data Block Wizard to specify the following: • Data source type • Query procedure • Insert procedure • Update procedure • Delete procedure • Lock procedure

14. Data Source Guidelines Base a data block on a FROM clause query to: • Create a “dynamic” view Base a data block on a stored procedure to: • Increase control and security • Specify a SELECT statement at run time • Query or update multiple tables • Perform complex computations • Perform validation and DML on the server side

15. Data Source Guidelines Query YES YES YES YES YES YES Data Source Table View FROM Clause Proc-Ref Cur Proc-Table Rec Transac. Trigger DML YES YES NO NO YES YES

16. Summary • Base data blocks on new data sources: – FROM clause query (query only) – Stored procedure (query and DML) • Exploit features of stored procedures : – REF cursors limited to a single SELECT statement – Table of records can be a complex procedure

Editor's Notes

#12: Queries with Stored Procedure Returning a REF Cursor Executing queries using a stored procedure that returns a REF cursor takes One round trip to execute the stored procedure(1,2), plus one round trip (3,4) per array size of rows returned. Performance Implications The no of records fetched depends on the Array Fetch property value
#13: Queries or DML with Stored Procedure Using PL/SQL Tables of Records Executing queries or DML with stored procedures using PL/SQL tables of Records takes one round trip to execute the stored procedure (1,2) plus one Round trip (3,4) for all rows. Performance Implications All records are fetched.

Oracle Forms: Data Blocks on Different Sources

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Editor's Notes