Dynamic varchar db2

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts. View solution. View Solution. Why EE? Courses Ask. Get Access. Log In. Web Dev. We help IT Professionals succeed at work. Last Modified: I'm trying to pass a variable to my AS system but cannot get the syntax right.

Start Free Trial. View Solution Only. Commented: Hi atprato, Are you trying to execute a string on the AS? If so, just declare it as a varchar object as you would in SQL Server.

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After that there are somethings that you need to do differently. If you're doing a dynamic SELECT statement, it'll return a result-set, so it's easiest to do that in a stored procedure. Give me a minute, and I'll whip up quick example for you. Author Commented: Hello all, I should have mentioned, we are sending the statement as text via ODBC from excel and trying to get the result back out of the system to excel.

Manipulating the system stored procedures etc is not an option. We do this all the time with a regular select statement but now we are trying to figure out the syntax to wrap the select statement in a variable. Can anyone correct our syntax for AS DB2 iseries system? How do you plan to handle any result set if you ever do get it to work?

It won't be easy getting it to work, if it ever will. An undefined result set seems pretty messy. When we do a straight select statement the result comes right back to the spreadsheet. I was hoping the result of the select statement wrapped in a variable would work the same way. Or maybe we need another step in the SQL text where we select the variable? Dear Kent, if I was going to use the "insert into" method, could I create and drop "mytable" on the fly?

In other words I would create the table and use the table as the result just long enough to select the result out of it and then delete mytable. If that would work, what do I need to add to my SQL string to create mytable, select the result out of it and then drop it? Need help with the syntax please. Hi atprato, You can drop and create tables this way. However, you haven't really solved anything by doing this. Presumably, the data already exists in the database, so moving it to a temporary table and querying the temp table instead of the permanent table doesn't get you anything.

You're better off just querying the permanent table.Select all Open in new window. Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

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dynamic varchar db2

Jim Youmans asked. Last Modified: DB2 So here is what I have. I have tried a couple of ways but no luck. Is there a better way to do this? Start Free Trial.


View Solution Only. Jim Youmans Sr Database Administrator.Most application programmers are comfortable coding embedded SQL in their programs to access DB2 data. Static SQL is hard-coded, and only the values of host variables in predicates can change.

Dynamic SQL is characterized by its capability to change the columns, tables, and predicates it references during the program's execution. This flexibility requires different techniques for embedding dynamic SQL in application programs.

cast varchar for bit data to varchar

You should understand what dynamic SQL is and what it can do for you for many reasons. Because the values are available when the optimizer determines the access path, it can arrive at a better solution for accessing the data. Additionally, dynamic SQL is becoming more popular as distributed queries are being executed from non-mainframe platforms or at remote sites using distributed DB2 capabilities. As long as application systems require these capabilities, dynamic SQL will be needed.

If you do not need to issue queries, you can write the SQL portion of your program in two steps. First, move the complete text for the statement to be executed into a host variable. The statement is prepared and executed automatically. This preparation is automatic and can involve a significant amount of overhead. For example, the following types of programs are potential candidates:.

dynamic varchar db2

This feature is demonstrated in the following pseudo-code:. The question mark is used as a parameter marker, replacing the 'A00' in the predicate.

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When this example is executed, the host variable value replaces the parameter marker. Consider a program that executes SQL statements based on an input file. The key value that provides the condition for the execution of the SQL statements can be substituted using a host variable and a parameter marker.

This method greatly reduces overhead and runtime and increases the efficient use of system resources.

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A prepared statement can contain more than one parameter marker. Use as many as necessary to ease development. The next two classes of dynamic SQL provide this capability. You need to do so to create the proper working-storage declaration for host variables in your program. SQL to execute:. When the program is finished, the cursor is closed.

This example is simple because the SQL statement does not change. For example, you could move the SQL statement.

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No parameters would be passed in the OPEN statement. You can recode the OPEN statement as follows:. The columns to be retrieved must be static, however. If you need the additional flexibility of changing the columns to be accessed while executing, use a varying-list SELECT. You can change tables, columns, and predicates "on-the-fly. The lack of knowledge regarding what is being retrieved adds considerable complexity to your application programs.

It contains information about the type of SQL statement to be executed, the data type of each column accessed, and the address of each host variable needed to retrieve the columns. For each column to be returned, this field indicates the data type and whether NULLs are permitted. They can be used in the logic of your application program to test for specific data types.

These two codes aid in the detection of the data type for each column. This information is used to determine the address of a storage area of the proper size to accommodate each column returned.More actions.

I have also tried concatting the variable at the end like ' As i mentioned earlier that OpenQuery wont accept variables, why dont you give a try creating a dynamic query with your OrderId getting concatinated to a string stored in a variable and than run with EXEC inside the procedure.

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I understand how to get the dynamic filter variable into the openquery command just by adding it to the execution string. If this is the case then I will have to put the results into a temp table then extract them from there.

When you are creating a dynamic sql with the orderid and all other stuff getting concatinated, please do something like this and try, you can see in the below statement that if you linkedservers are added then you create a statement of this sort, like what mosbachwil also tried to show you. And now try doing this. This is a hint and now you have to do the rest and it would be quick enough for you to resolve.

Unfortunately this query was very slow. It is much faster than the above method. I would have to declare those local variables within the EXEC command string but then of course they will not be available within the rest of the SP. Then I tried using a table type variable but that suffers exactly the same problems as above. So it now works but I have to create a temp table, and then extract the data from that table into my local variables which might be an uneccessary step.

I apologise if I am teaching grandma to suck eggs at any point but I just wanted to write a fuller explanation of the process. I agree to your arguments and even i liked the way you created the temp table and the whole process. Now i see what exactly you were looking for. And as per your requirements, i see this as the best step taken. But please take a note working with temp table that, creating a temp table would lock your tempdb untill the whole process or table is not getting created.

Well, you definaltely had to look for another option other than openquery and i think this creating a new table concept is good. And again if you dont see any problem for getting your tempdb locked untill you t table is getting created than go for this, or else you can simply create another physical table and do your process. David Burrows. Hi thanks for the response, this looks like a different approach again. I couldnt make complete sense of the post though.

This will retrieve the CustomerID of OrderID 1 but will retrieve all the rows from the linked server before selecting the one row you require. This will do the same but using a parameter but will again retrieve all the rows from the linked server before selecting the one row you require. Next you want to get the CustomerID into a variable, so supply a variable and use it in the query.

What type of linked server are we dealing with here? You must be logged in to reply to this topic. Login to reply. July 28, at am Any help greatly appreciated Rolf. July 29, at am Hi all, Thanks for the responses, thought I had sorted it but no!


Thanks Rolf.I don't have the size in front of me right now, but it was more than and less than 32k. This column can have binary data, but the subset of rows I am returning are primarily charactrer data. The SQL is dynamic. Neither seemed to work. It is almost as though I need a way to undo the "for bit data" in the cast somehow, i. Am I trying to do something that is not possible?

If I cannot get the cast to do what I want it to do, I may have to resort to creating a temporary table with one column defined as plain varchar. I would prefer to get the cast to work. It seems nonsensical, but it is one of those "software lifecycle" situations where functions are added later in a product's lifetime. In this case, the rows are interpreted differently according to the "type" of row. At least the only relevant part of the row in my situation is purely character data.

Dynamic SQL in SQL Server

For the non-character parts of the column, the client would be ignoring those fields. With that, you can specify regular character data as opposed to BIT data :. Terms of Service Privacy Policy Contact. Login Request Login.

Toggle navigation. Martin Wittow. Thanks, Martin Wittow [login to unmask email]. Phil Grainger. The only part of the rows that are of interest is character data. I am trying to cast the column as varchar, so that the client will see ASCII characters that he can use directly. I have not yet found a cast where he sees character data, only hex. RE: cast varchar for bit data to varchar.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am using a dynamic query wherein I want to use the variable which holds the datetime, whenever I execute the query it says cannot convert datetime from string, when I cast that variable to varchar maxit takes it as string and not datetimeso how should I execute the query. You should not concatenate your parameter values like this. Thus you can fix it by:. FacId, B.

FacName, B. BookCode, B. BookName, B.

dynamic varchar db2

Quantity, B. Learn more. Asked 9 years, 7 months ago.

dynamic varchar db2

Active 2 months ago. Viewed 69k times. Below is my SQL query which I am trying to execute. How should I execute this query? Abbas Abbas 4, 26 26 gold badges 85 85 silver badges bronze badges. Active Oldest Votes. You need to quote your dates.

Bobby 2, 3 3 gold badges 16 16 silver badges 33 33 bronze badges.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community.

It only takes a minute to sign up. What I am trying to do here is to Generate insert scripts for selected tables in my database in DB2 I have modified a procedure available here as below.

Now since there are more than one tables for which we need insert statements, i call the same from another procedure. Intending to Generate insert scripts for all the necessary procedures in one procedure call. The output is Good. But it Duplicates the insert statement. For this particular call, the Inserts. Notice the inserts coming Two Times for each table.

This multiplies for each call I add in the procedure. Sign up to join this community. The best answers are voted up and rise to the top. Asked 4 years, 7 months ago. Active 4 years, 7 months ago. Viewed times. Let us continue this discussion in chat. Active Oldest Votes. Sign up or log in Sign up using Google.

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