When the dbms_sql.bind_variable is used?

DB version: 11.2

I'm new kind of PL/SQL and I've never worked with DBMS_SQL. BIND_VARIABLE. Currently, I am going through some codes that we have that a lot of DBMS_SQL. BIND_VARIABLE.

Googling, I got to know the basic of its operation mechanism.

I have 2 questions.

1. Why do people use dbms_sql.bind_variable?

2. in our firm, it is being implemented to make many insertions as below.

The code is displayed as below (Snipped to show only the relevant parts)

No idea why the INSERT is in like that?

 
begin
--- At first a CURSOR is formed .

cursor YCURS select column1, 
              column2,
              .
              .
              .
          from manh_parcel_hdr
          where ..
          ;

        
          
typ_1 varchar2(35);
typ_2 varchar2(35);
 
 --| Then a variable is created like below
 
 manh_parcel_hdr_item number;  
 
 manh_parcel_hdr_item := dbms_sql.open_cursor;
 
 -- Then this INSERT is constructed 
 
 dbms_sql.parse( manh_parcel_hdr_item, 'insert into manh_parcel_hdr_item ( sku_id, sku_type, .......) values (  :sku_id, :sku_type, );


typ_1 := ' ';
typ_2 := ' ';



for rec IN YCURS 
loop
    pltChanged_1 := 0;
    pltChanged_2 := 0;
     
     typ_1 := rec.ACCOUNTNO_2||rec.CURRENCYCODE_2;
     
     IF typ_1 != typ_2 THEN
     
         IF rec.ACCTTYPE_1 != rec.ACCTTYPE_2  ... some more conditions...
             rec.ACCTTYPE_1 := rec.ACCTTYPE_2;
             pltChanged_1 := 1;
             
             END IF; 
             
             dbms_sql.bind_variable( manh_parcel_hdr_item,':ACCTTYPE', rec.ACCTTYPE_2 ); --- What is happening here ?
             
             
         ELSE
             dbms_sql.bind_variable( manh_parcel_hdr_item,':ACCTTYPE', '');  ---------> and here ?
         END IF;
     
...
..

Greeny wrote:

No idea why the INSERT is in like that?

My guess is to re - use the cursor INSERT handle - which is something that the PL/SQL optimizer will be done automatically.

A slider is like a program. Bind variable are as input data for this program. It works essentially as follows. You send the source SQL (with bind variable) to the SQL engine. For example

insert into footab values( :1, :2 )

This code is analyzed and a cursor is created. You return a SQL engine cursor handle. The integration program is ready to run.

You can now assign values to variables +: 1 + and +: 2 + this program. This is what we call liaison.

Once you have assigned to them, you can now run this program - and it inserts these values into the table.

Without releasing the program (closing the cursor), you can assign new values (bind) and run the program again to insert another line. And repeat this operation until you have all the data processed and inserted the required lines.

Last step is of course the release program.

And it is essentially in a few words what a slider is and how a cursor is used.

My guess is that your developer (s) did not want to encode an implicit cursor Insert in a loop - possibly think that each iteration of the loop will need to PL/SQL to create a cursor insert program, linking values to it, run it and close it. Then repeat the loop.

Thus, the developer manaually created the cursor using DBMS_SQL before the loop. And inside the loop, bind variables and run the slider. Providing this code reuses the same cursor insert again and again.

It is almost * correct approach in customer languages like C/C++, Java, PHP, Perl and so on.

However, it is not necessary in PL/SQL, as well as the optimizer recognizes what is done and how to make it optimally - create a cursor to the Insert SQL in this loop and re - use the handle to the cursor for each iteration of the loop.

The only real reason to use cursor DBMS_SQL in PL/SQL interface, is to treat dynamic SQL, a dynamic binding statements and dynamic recovery.

* The comment almost. The code is not really ideal. This bind-data and run cursor per loop iteration, it requires a 100 dregs and a cursor of 100 runs to insert a 100 lines. Sliders have a binding interface in bulk. This means that the code can bind a table - in other words, assign an array of 100 values of variable +: 1 + and a picture of a 100 variable values +: 2 +. The code then performs the cursor. Times. And cursor processes these bind tables and inserts a 100 lines.

For customers Java/Perl/etc., which reduced the number of round trips to the database. In PL/SQL, this is done using the FORALL statement and reduced the number of switches in context of the PL/SQL engine to the SQL engine.

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