Specify and use multiple libraries in ODBC connection string

Question

My odbc connection string for connecting to DB2i looks like this:

Driver={Client Access ODBC Driver (32-bit)};system=xx.xx.xx.xx;dbq=LIB1 LIB2 LIB3 LIB

Answer 1

This works as documented in the manual:

The library list is used for resolving unqualified stored procedure calls and finding libraries in catalog API calls. ... Note: The first library listed in this property will also be the default library, which is used to resolve unqualified names in SQL statements.

Answer 2

As stated above, Schema/library list is used to resolve functions/procedure names, not tables.

Let assume you need to read data from lib1.tab1 and lib2.tab2;

Here my personal workarounds (from easy to complex):

a) ask the db admin to have - for each table you need to use - the corresponding schema name, then do "select * from lib1.tab1 join lib2.tab2 on [...]" ;-) b) ask the db admin to create on schema "MyAlias" several alias (create alias) for each table you want to use. Then do "set current schema=MyAlias" followed by all the SQL statement you need e.g. "select * from tab1 join tab2". Since you’re querying myalias.tab1 which is an alias pointing to table lib1.tab1 it should work.

c) Complex: create your own SQL function that returns the corresponding schema_name for a table (e.g. myfunct('TAB1'). This could be done reading system view “qsys2.systables” where table_name=’TAB1’ and returning TABLE_SCHEMA column, which is a varchar(128). Once you got it, build up a dynamically prepared using the variable you just obtained. E.g. "set mylib = myfunct('TAB1'). "set mystmt = 'select * from '||table_schema || ‘.tab1’ …”

Prepare mystmt and then execute mystmt.

I did something similar in VBA using ado ibmdrda and it worked.

hope this helps.

f.

Answer 3

Use "system naming" mode, by adding naming=1 to your connection string.

In your library list, place a comma before the first library.

Driver={Client Access ODBC Driver (32-bit)};system=systemname;naming=1;
dbq=,LIB1,LIB2,LIB3,LIB4,LIB5,LIB6,LIB7,LIB8;languageid=ENU;cmt=0;signon=1