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Gelöst Open VSQLiteDatabase

Beatrix Willius
as SQLite DB Server
Dienstag, Juni 16 2020, 07:50 AM
Abonnieren via E-Mail

Continuing the discussion from https://www.valentina-db.com/de/discussions/7458-transactions-committing-to-vsqlite .

I found my problem and - yes - I was totally stupid. Ahem, I had assumed that CreateDatabaseFileEx() simply opens a database if it already exists. But it makes a new database. However, I can't figure out how to open a database.



db.Host = "localhost"

db.UserName = "sa"

db.Password = "sa"

db.Port = 15532

Connected = db.Connect()



if Connected then

 db.databaseName = "vsqlitetest.sqlite"

 connected = db.OpenDataBaseFile

  if not Connected then Connected = db.CreateDatabaseFileEx()

end if

If the database already exists then an OpenDataBaseFile doesn't open the database. In the attached screenshot you can see that isOpen = false.

How do I open a VSQLiteDatabase?

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Antworten (6)

Ivan Smahin Akzeptierte Antwort

Please, check our example:

To always create the db you should do:



Connected = db.Connect()



if Connected then

  // only NOW we specify db_name, and do create on remote Valentina SQLite Server. Must be ADMIN.

  db.databaseName = "vsqlitetest.sqlite"

  Connected = db.CreateDatabaseFileEx()  // assign again into the same variable, will be TRUE if db was created under VServer, so we can use DB.

end if

...

// Db was created.

...

If you want to open db you should set db.databaseName property before db.Connect() call:



db.DatabaseName = "vsqlitetest.sqlite"

Connected = db.Connect()

...

// Db was opened.

...

In case if db can not be opened Connected will be false.

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Ivan Smahin Akzeptierte Antwort

Actually, OpenDataBaseFile() is an alias to Connect() for local dbs. It cannot be used with remote Valentina SQLite Server.

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Ivan Smahin Akzeptierte Antwort



if( gClient ) then

  db.Host = "localhost"

  db.UserName = "sa"

  db.Password = "sa"

  db.Port = 15532 // optional. You can change port for SQLite DB connections in the VServer.ini file.

  

  '

  ' Create or Open db:

  '

  

  '' Create:

  'Connected = db.Connect()

  'if Connected then

  '// only NOW we specify db_name, and do create on remote Valentina SQLite Server. Must be ADMIN.

  'db.databaseName = "vsqlitetest.sqlite"

  'Connected = db.CreateDatabaseFileEx()  // assign again into the same variable, will be TRUE if db was created under VServer, so we can use DB.

  'end if

  

  '' Open:

  'db.DatabaseName = "vsqlitetest.sqlite"

  'Connected = db.Connect()

  

  ' Create if not exists:

  db.DatabaseName = "vsqlitetest.sqlite"

  Connected = db.Connect()

  if not Connected then

    Connected = db.CreateDatabaseFileEx()  // assign again into the same variable, will be TRUE if db was created under VServer, so we can use DB.

  end if

  ...

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Beatrix Willius Akzeptierte Antwort

Thanks, guys! Got everything working now. Please update your example.

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Ruslan Zasukhin Akzeptierte Antwort

V4RB Examples improved in 10.4.6

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Beatrix Willius Akzeptierte Antwort

Thanks!

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