Dynamic sql - pl sql, PL-SQL Programming

Assignment Help:

Dynamic SQL:

The Most PL/SQL programs do a predictable, specific job. For illustration, a stored procedure may accept an employee number and salary increase, and then update the sal column in the emp table. In these circumstances, the full text of the UPDATE statement is acknowledged at the compile time. These statements do not change from execution to execution. Therefore, they are known as static SQL statements.

Though, some programs should build and process a variety of the SQL statements at the run time. For illustration, a general-purpose report writer should build various SELECT statements for the various reports it generates. In this situation, the full text of the statement is unknown until the run time. These statements can, and almost certainly will, change from execution to execution. Therefore, they are known as the dynamic SQL statements.

The Dynamic SQL statements are stored in the character strings build by your program at the run time. These strings should contain the text of the valid SQL statement or the PL/SQL block. They can also contain the placeholders for bind arguments. The placeholder is an undeclared identifier, so its name, to which you should prefix a colon, that does not matter. For illustration, the PL/SQL makes no difference between the following strings:

'DELETE FROM emp WHERE sal > :my_sal AND comm < :my_comm'

'DELETE FROM emp WHERE sal > :s AND comm < :c'

To process the most dynamic SQL statements, you can use the EXECUTE IMMEDIATE statement. Though, to process the multi-row query (SELECT statement), you should use the OPEN-FOR, FETCH, and CLOSE statements.

 


Related Discussions:- Dynamic sql - pl sql

An active database in pl-sql, Consider the following set of database tables...

Consider the following set of database tables (same tables from Assignment 6-1). Please take note of foreign keys (most of them carry the same names as the corresponding primary ke

Advantages of exceptions, Advantages of Exceptions Using the exception...

Advantages of Exceptions Using the exceptions for the error handling has many benefits. Without an exception handling, every time you issue a command, you should ensure for th

I need sql to infopath data connection, I need SQL to infopath data connect...

I need SQL to infopath data connection Project Description: Want data retrieval connection from SQL to SharePoint infopath Skills required are Sharepoint, SQL

I want to build website for funding, Project Description: I want to rebu...

Project Description: I want to rebuild it and add better content to it It will include up to 5 forms The data will be saved on SQL server and the data access layer could b

Parameter and keyword description - %type attribute, Parameter and Keyword ...

Parameter and Keyword Description: collection_name: This keyword identifies the index-by table, nested table, or varray formerly declared within the present scope. cu

Initializing records, Initializing Records The illustration below show...

Initializing Records The illustration below shows that you can initialize a record in its type definition. Whenever you declare a record of the type TimeRec, its 3 fields supp

Theory of eternity of life - origin of life, THEO R Y OF ETERNITY OF LIFE...

THEO R Y OF ETERNITY OF LIFE (PRAYER - 1880) - The theory of eternity of life, also called the steady-state theory , states that life has ever been in existence as at presen

Relational operators-comparison operators, Relational Operators The rela...

Relational Operators The relational operators permit you to compare randomly complex expressions. The list below provides the meaning of each operator:

Parameter aliasing, Parameter Aliasing   To optimize the subprogram ca...

Parameter Aliasing   To optimize the subprogram call, the PL/SQL compiler can decide between the two techniques of the parameter passing. With the by-value techniques, the v

Assignment source not a literal - variable, Assignment Source Not a Literal...

Assignment Source Not a Literal - Variable Syntax: SET SN = SID (SUBSTRING (SN.C FROM 1 FOR 1)||'5');

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