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John117

SQLite.au3 - how to test if table exsists already.

7 posts in this topic

I have a simple test script for this post.

Trying to get my script to verify if a table exsists, if not, then add the table.

Have tried sqlite statements I have found. none seem to work for me. Anyone here know sqlite enough to make this check if the table exsists before adding it. Just looking to get rid of the error the second time it is run.

It runs in my main script everytime the script loads. -needs to.

#include <SQLite.au3>
#include <SQLite.dll.au3>

_Query_Database_Startup_Info()

Func _Query_Database_Startup_Info()
 Global $SqlLiteDll = _SQLite_Startup()
 If @error Then
  MsgBox(16, "Error", "Failed to start up SQLite, @error = " & @error)
 Else
  $hDB = _SQLite_Open(@ScriptDir & "\CIF1.db")
  If $hDB = 0 Or @error Then
   MsgBox(16, "Error", "Error opening database, @error = " & @error & ", @extended = " & @extended)
  Else
   $sExec = "CREATE TABLE TableNameHere (ID_Here INTEGER PRIMARY KEY,a,b,c,d,e);"
   _SQLite_Exec($hDB, $sExec)
   _SQLite_Close($hDB)
   _SQLite_Shutdown()
  EndIf
 EndIf
EndFunc   ;==>_Query_Database_Startup_Info

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john117,

See this thread

kylomas


Forum Rules         Procedure for posting code

"I like pigs.  Dogs look up to us.  Cats look down on us.  Pigs treat us as equals."

- Sir Winston Churchill

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select count(*) from sqlite_master where type='table' and name like 'mytable'

will return 0 or 1 depending on table existence.

Now the kludge above is probably not what you actually need. Try this instead:

$sExec = "CREATE TABLE if not exists TableNameHere (ID_Here INTEGER PRIMARY KEY,a,b,c,d,e);"

Pure SQL does it. See SQLite docs.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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jchd,

Yes, that is the solution in the thread I cited. Am I mistaken?

kylomas


Forum Rules         Procedure for posting code

"I like pigs.  Dogs look up to us.  Cats look down on us.  Pigs treat us as equals."

- Sir Winston Churchill

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Very useful stuff from both of you! Thank you, will use for much more than the question stated.

$sExec = "CREATE TABLE if not exists TableNameHere (ID_Here INTEGER PRIMARY KEY,a,b,c,d,e);"

was very useful!

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Pretty standard way to [re]create tables in SQL without having to worry about what happened just before.

BTW, try avoiding declaring columns without a type, even given that SQLite is quite permissive about datatypes. Or rather declare intended types _because_ SQLite is quite smart by its own and will do its best to fulfill your desires.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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Ok, can you give me an example by rewriting this line?

$sExec = "CREATE TABLE if not exists TableNameHere (ID_Here INTEGER PRIMARY KEY,a,b,c,d,e);"

What would be the positive outcome, or what would it avoid?

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