dynamic query for package does not work

Dear members,

I have problems with a package in the creation and analysis of a dynamic query in the WHERE clause. Here is an example of what I'm trying to do:

PROCEDURE test_status_proc)
wtd_cursor ON cur_type
date_1 IN date
date_2 IN DATE
status in VARCHAR2,
flag in VARCHAR2)

IS

status_sql VARCHAR2 (250): = NULL;
flag_sql Varchar2 (100): = NULL;

BEGIN


Status of the IF = 'A' THEN
lv_status_sql: = 'A ';
lv_flag_sql: = 'Y ';
END IF;
Status of the 'I' = IF THEN
lv_status_sql: = 'A ';
lv_flag_sql: = 'n';
END IF;

Status of the 'R' = IF THEN
lv_status_sql: = "R";
lv_flag_sql: ='* ';
END IF;

Status of the IF = n THEN
lv_status_sql: = 'n';
lv_flag_sql: ='* ';
END IF;

IF status_code = 'IRN' THEN
"lv_status_sql: = '('' N'','' R'');
lv_status_sql: = lv_status_sql | ' OR (s.status = s.flag = "A" AND "N")';
lv_usecalc_sql: ='* ';
END IF;

Status of the = IF'* ' THEN
lv_status_sql: ='* ';
lv_flag_sql: ='* ';
END IF;

OPEN FOR Test_cursor

SELECT * from test_status s
WHERE
s.Daytime BETWEEN date_1 AND date_2
S.status AND decode (lv_status_sql,'* ', s.status, lv_status_sql)
S.flag AND decode (lv_flag_sql,'* ', s.flag, lv_flag_sql);

The problem I have is especially with the condition 'IRN '. The suite WHERE the part of the clause looks like the following in the lv_status_sql, but the query returns all the values:

-(', 'R') OR (s.status = 'A' AND s.flag =' only)

Any help would be much appreciated.

Kind regards

dreporter wrote:

Thanks for your reply and I completely understand your frustration. The problem is sometimes it is very difficult to describe all of the problem due to several reasons. Please take a look at my last post to see if that makes sense.

If you really need SQL dynamic - true dynamic SQL which includes dealing with dynamic number of bind variables - then DBMS_SQL are an excellent interface to use.

You can generate the dynamic SQL statement based on the question of whether the filter criteria is null (do not use) or not null (use as a predicate). For example

if someParam10 is not null then
  // someParam10 needs to be used as a filter predicate
  dynamicSQL := dynamicSQL || ' and some_col_10 = :someParam10 ';
end if;

This statement can then be analyzed using the DBMS_SQL interface. The binding of values uses the same logic that was used to create predicates. For example

if someParam10 is not null then
  // someParam10 is used and needs to be bound
  DBMS_SQL.Bind( myCursor, 'someParam10', someParam10 );
end if;

So, with this approach simplistic, you can easily create a dynamic SQL with variable predicates, dynamically bind these and run the slider.

Bind variables are used in the dynamic SQL statements, as there are very few threats of SQL injection. And the basic principles observed for shareable SQL creation - the same set of parameters not null to filter, will result in the same SQL statement, which allows the cursor within the Pool shared for this SQL statement to be reused.

So, technically, dynamic SQL is not a major problem (if used correctly). The major problem is that if really necessary to address the requirements of the business at hand.

The problem I have with many comments here want to use dynamic SQL statements, is that it is used as one would use a file i/o interface.

For file IO you want standard Open(), Read(), Write() and Close() calls. And you, the appellant, simply pass the name of the file and the data to write or to receive the data read.

Similarly, these posters want to use SQL to open a table and read and write the data column - and do it by calling simply (and dynamically) by specifying the name of the table and column. Approaches to dynamic SQL based on one such concept is wrong. And shows that much of the ignorance of what a RDBMS is and how to use an RDBMS.

Tags: Database

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