OpenEuphoria

Re: Database.e; db_select(); Can't make it work...

• Posted by CChris <christian.cuvier at agriculture.gouv.fr> Mar 26, 2007
• 748 views

ZNorQ wrote:
> 
> I got a program that have 2 ".edb" files, and I'm trying to use db_select()
> to switch between the three.
> 
> When the program starts, it checks to see if the 2 files exists, and if they
> don't - it creates them using the db_create().
> 
> Now, I thought that when using db_create() - this also acts as db_open() and
> keeps those databases open, and that I'm then able to use db_select() to
> switch between them.
> 
> Example;
> 
> <font color="#330033"><EuCode></font>
> <font color="#FF00FF">  sequence </font><font color="#330033">jStatus</font>
> <font color="#330033">  jStatus = {}</font>
> <font color="#FF0055">  --</font>
> <font color="#330033">  jStatus &= db_select(</font><font
> color="#00A033">"c:\\Metadata.edb"</font><font color="#330033">)</font>
> <font color="#330033">  jStatus &= db_create_table(</font><font
> color="#00A033">"TBL_DOCUMENTS"</font><font color="#330033">)</font>
> <font color="#FF0055">  --</font>
> <font color="#330033">  jStatus &= db_select(</font><font
> color="#00A033">"c:\\System.edb"</font><font color="#330033">)</font>
> <font color="#330033">  jStatus &= db_create_table(</font><font
> color="#00A033">"IDX_DOCUMENTS"</font><font color="#330033">)</font>
> <font color="#330033">  jStatus &= db_select_table(</font><font
> color="#00A033">"SYS_HEADINGS"</font><font color="#330033">)</font>
> <font color="#330033">  jStatus &= db_insert(</font><font
> color="#00A033">"TBL_DOCUMENTS"</font><font color="#330033">, </font><font
> color="#00A033">"STR_DOC_NO"</font><font color="#330033">, </font><font
> color="#00A033">"STR_DOC_TITLE"</font><font color="#330033">)</font>
> <font color="#330033">  jStatus &= db_select_table(</font><font
> color="#00A033">"SYS_AUTONUMBER"</font><font color="#330033">)</font>
> <font color="#330033">  jStatus &= db_insert(</font><font
> color="#00A033">"TBL_DOCUMENTS"</font><font color="#330033">, </font><font
> color="#993333">{</font><font color="#00A033">"DOC" </font><font
> color="#330033">& </font><font color="#00A033">"#"</font><font color="#330033">,
> 1</font><font color="#993333">}</font><font color="#330033">)</font>
> <font color="#FF0055">  --</font>
> <font color="#330033">  jStatus &= db_select(</font><font
> color="#00A033">"c:\\Metadata.edb"</font><font color="#330033">)</font>
> <font color="#330033">  jStatus &= db_select_table(</font><font
> color="#00A033">"TBL_DOCUMENTS"</font><font color="#330033">)</font>
> <font color="#330033"></EuCode></font>
> 
> 
> What happens here is that 2 tables are created in "Metadata.edb", but
> the intention was that "TBL_DOCUMENTS" is created in "Metadata.edb",
> and "IDX_DOCUMENTS" is created in "System.edb"..
> 
> Can anyone spot what I'm doing wrong?
> 
> Kenneth / ZNorQ

Are you sure you succesfully opened the two databases? The doc for 
db_select() says a database must be opened (using db_create() or db_open())
in order for db_select to succeed.
Also note that db_select_table(), likewise, doesn't create a table if it
 doesn't exist, but does nothing instead, returning the DB_OPEN_FAIL
 error code.
By the way, trying to run your code sippet gave me an error on the first
 db_insert() statement, as it has 3 arguments instead of 2.

Running this code gave me the result you expected:

include database.e
  ?db_create("Metadata.edb",DB_LOCK_NO)
  ?db_create("System.edb",DB_LOCK_NO)
  ?db_select("Metadata.edb")
  ?db_create_table("TBL_DOCUMENTS")
  --
  ?db_select("System.edb")
  ?db_create_table("IDX_DOCUMENTS")
  ?db_select_table("SYS_HEADINGS")
  ?db_insert("TBL_DOCUMENTS", {"STR_DOC_NO", "STR_DOC_TITLE"})
  ?db_select_table("SYS_AUTONUMBER")
  ?db_insert("TBL_DOCUMENTS", {"DOC" & "#", 1})
   --
  ?db_select("c:\\Metadata.edb")
  ?db_select_table("TBL_DOCUMENTS")
?machine_func(26,0)

Of course you'll have to replace the ?s by "jStatus &= ". I did so to
 see which operations failed and what the db_table_list() were.
CChris