Benefit of the dynamic sql pl sql, PL-SQL Programming

Assignment Help:

Benefit of the dynamic SQL:

This part shows you how to take full benefit of the dynamic SQL and how to keep away from some of the common pitfalls.

Passing the Names of Schema Objects:

Assume that you require a procedure which accepts the name of any database table, and then drop that table from your schema. By using the dynamic SQL, you may write the stand-alone procedure as shown below:

CREATE PROCEDURE drop_table (table_name IN VARCHAR2) AS

BEGIN

EXECUTE IMMEDIATE 'DROP TABLE :tab' USING table_name;

END;

Though, at run time, this procedure fails with an invalid table name error. That is as you cannot use the bind arguments to pass the names of the schema objects to a dynamic SQL statement. Rather, you should embed parameters in the dynamic string, and then pass the names of the schema objects to those parameters.

To debug the last illustration, you should revise the EXECUTE IMMEDIATE statement. Rather of using the placeholder and bind the argument, you can use the concatenation operator to embed the parameter table_name in the dynamic string, which is as shown below:

CREATE PROCEDURE drop_table (table_name IN VARCHAR2) AS

BEGIN

EXECUTE IMMEDIATE 'DROP TABLE ' || table_name;

END;


Related Discussions:- Benefit of the dynamic sql pl sql

Ending transactions, Ending Transactions A good quality programming pr...

Ending Transactions A good quality programming practice is to commit or roll back every transaction explicitly. Whether you rollback or issue the commit in your PL/SQL program

Parameter and keyword description - procedures, Parameter and Keyword Descr...

Parameter and Keyword Description: procedure_name The user-defined procedure is declared by this construct. parameter_name: This identifies the formal parameter t

What is a record, What Is a Record  ? A record is a group of related...

What Is a Record  ? A record is a group of related data items that stored in the fields, each with its own name and datatype. Assume that you have different data about an em

Package standard, Package STANDARD The package named STANDARD defines t...

Package STANDARD The package named STANDARD defines the PL/SQL atmosphere. The package specification globally declares the exceptions, types, and subprograms that are available

Using lock table, Using LOCK TABLE You use the LOCK TABLE statement to...

Using LOCK TABLE You use the LOCK TABLE statement to lock the whole database tables in the specified lock mode so that you can share or deny the access to them. For illustrati

Cursor for loops, Cursor FOR Loops In most cases that need an explicit ...

Cursor FOR Loops In most cases that need an explicit cursor, you can simplify the coding by using a cursor FOR loop rather of the OPEN, FETCH, and CLOSE statements. A cursor FO

Components of an object type in pl/sql, Components of an Object Type: A...

Components of an Object Type: An object type encapsulates the operations and data. Therefore, you can declare the methods and attributes in an object type specification, but no

Transactions in sql, Transactions in SQL BEGIN TRANSACTION, COMMIT, an...

Transactions in SQL BEGIN TRANSACTION, COMMIT, and ROLLBACK, SQL has the same syntax except for START in place of BEGIN. However, START TRANSACTION is used only for outermost

I want customer management program, This is a Customer Management project. ...

This is a Customer Management project. Customer data is presented in a text file. The program will load this text data into its DB columns. The data mapping is user definable. User

Effects of null for table expression, Effects of NULL for Table Expression ...

Effects of NULL for Table Expression Here's an important distinction between expressions denoting tables and expressions denoting multisets of rows: a table expression cannot

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd