Sql parameter substitution problems

Question

Hi,
I am having problems with the sql parameter substitution. I have a query that
looks like this:
select name,value from table where name in ('name1','name2');
I have tried building a string that equals "'name1','name2'" and passing it as
a parameter to sql entering the javaDoc comments like:
select name,value from table where name in ({nameString})
The problem is that when it is substituted and set to the database it looks like
this:
select name,value from table where name in ('\'name1\',\'name2\'');
This will not work. Does anyone have any suggestions on how to do this using a
database control. Basically I'm looking for the ability to create dynamic sql
statements.
Thanks for your help.
Regards,
James

Answer 1

Anurag,
Thanks for the reply. I don't think that this solves my problem though. I will
never know how many strings to pass. It's all based on what the user wants, they
could ask for 2, 20, or any other number of names. It sounds like using a Database
control is not really possible for this situation. What do you think? Any chance
of this making into workshop in the future or in these situations is creating
an EJB the only way to go?
Thanks again.
Regards,
James Chamberlain
"Anurag Pareek" <[email protected]> wrote:
Hi James,
This result is same as what you will get on executing the following prepared
statement:
conn.prepareStatement("select empid from empdemo where name in (?)");
pstmt.setString(1,"'Person 1','Person 2','Person 3'");
pstmt3.execute();
Workshop's DBControl internally uses a PreparedStatement, hence you would
obtain the same result.
To get it working, you will need to pass in the 3 strings separately
as
below:
conn.prepareStatement("select empid from empdemo where name in
pstmt.setString(1,"Person 1");
pstmt.setString(1,"Person 2");
pstmt.setString(1,"Person 3");
Please do let me know if you have further queries regarding the issue.
Regards,
Anurag
Workshop Support
"James Chamberlain" <[email protected]> wrote in message
news:[email protected]...
Hi,
I am having problems with the sql parameter substitution. I have aquery
that
looks like this:
select name,value from table where name in ('name1','name2');
I have tried building a string that equals "'name1','name2'" and passingit as
a parameter to sql entering the javaDoc comments like:
select name,value from table where name in ({nameString})
The problem is that when it is substituted and set to the databaseit
looks like
this:
select name,value from table where name in ('\'name1\',\'name2\'');
This will not work. Does anyone have any suggestions on how to do thisusing a
database control. Basically I'm looking for the ability to create dynamicsql
statements.
Thanks for your help.
Regards,
James