Class ArrayServer for CA-Visual Objects

 

 

 

By the nature of the activities I had to apply uncommon decisions to achievement of goals. And it is frequent, to convenience of viewing and information processing I apply arrays. And for convenience of operation with arrays – ArrayServer (array-server).

 

Until recently as ArrayServer used bArrayServer. But, during operation I was stimulated to enter a set of changes. And, some time ago I corresponded with the author of library, having suggested it to make corrections. The author of bArrayServer recommended to me to write the class.

 

And by the end of summer of 2012 work was made.

 

 

 

 

            AS_DATAFORMAT_FAST

            AS_DATAFORMAT_NORMAL

            AS_DATAFORMAT_DBASE

 

When using the AS_DATAFORMAT_FAST and AS_DATAFORMAT_NORMAL formats - two types of fields are added:

            "O" – objects

            "U" – usual

 

For these types of fields it isn't controlled their lengths (but by DBS_LEN must be > 0).

 

When using AS_DATAFORMAT_FAST format - it is considered that the user (programmer) does everything correctly, monitoring over data is reduced. It increases operation speed.

 

When using AS_DATAFORMAT_NORMAL format - verification of read-out data (only for DBASE of types of fields) and their adjustment to a required format is added.

 

When using AS_DATAFORMAT_DBASE format - the DBASE type fields are admissible only. Complete control is made in case of read operations and data record.

 

Database structure check is made:

 

The Use( ) method allows to change and a body of a DB and to add other data (copying of data).

As well as for DbServer – SetOrderCondition( ) operation is made.

Operation with Custom, Unique-warrants and so forth is allowed. Generally, in difference from bArrayServer, all installations of SetOrderCondition( ) are involved.

 

Since by operation with ArrayServer disk operations aren't provided (it not the file), the buffer size - zero. Operation with the buffer of data - isn't provided.

 

Since it not a file server, locks actually don't work (they aren't necessary). RLock( ), RLockVerify( ), UnLock( ), etc. - always return TRUE. __ NotifyBufferFlush( ) - too does nothing.

But, all these methods are left for compatibility!

 

The server uses ANSI character set. See: Info( DBI_ISANSI ).

 

 

Attention! Important information on the decimal separation character in key expressions. (In case of creation of orders with conversion: Str( NumberField )). Since characters of separators of discharges and fractional parts randomly don't change, they can be changed only in the absence of orders. The type of these delimiting characters is fixed by the server in case of order creation. If delimiting characters have to be changed, at first it is necessary to close (to delete) all orders, then – to set necessary, and to recreate orders again. Respectively, OrderInfo( DBOI_KEYVAL ) - will give out value taking into account the separators set for the server now. See: Info( DBI_GETDELIMETER ), Info( DBI_SETDELIMETER ).

We can establish connection with the Detail-server. And here DbServer as the Master-server for us, most likely, won't be able to be since it works through алиас. And at us алиаса isn't present. The problem can be bypassed, having made SubClassing and, having written for your new class the suitable SetRelation( ) method. (See bDbServer:SetRelation( ) from bBrowser library).

 

The Master-server can be only one.

The Detail-servers - is so much, how many it is necessary.

 

 

Class while without methods: Scope( ) and Eval( ). In principle, the kernel for use of the Scope( ) methods and Eval( ) – is made. Already created methods allow working with them. Interested persons can quietly complete it.

 

That for this purpose it is necessary: