DbServer.Info Method

Return and optionally change information about a data server.

Namespace: VO
Assembly: VORDDClasses (in VORDDClasses.dll) Version: 2.21

Syntax

 VIRTUAL METHOD Info(
	kInfoType,
	uInfo
) AS USUAL CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public virtual Usual Info(
	Usual kInfoType = default,
	Usual uInfo = default
)

Request Example View Source

Parameters

kInfoType (Optional): Type: Usual
Specifies the type of information. The constants are described in the Constants section below.
The initial default of a setting depends on the RDD.
The constants are described in the Constants section below. Note, however, that not all constants are supported for all RDDs.
Important! _SET_USER is a constant that returns the minimum value that third-party RDD developers can use for defining new parameters. Values less than _SET_USER are reserved for X# development.
uInfo (Optional): Type: Usual
If specified, this parameter is used to change the value of a setting. The data type (and whether uInfo can be specified), depends on the kInfoType constant and is documented in the Constants section below.

Return Value

Type: Usual
If uInfo is not specified, DBServer:RDDInfo() returns the current setting. If uInfo is specified, the previous setting is returned.

Remarks

Constant	Description
DBI_ALIAS	Returns the alias name of the work area as a string.
DBI_BLOB_HANDLE	Returns an IntPtr representing the file handle for a BLOB file. The constant is most often used in conjunction with FieldInfo(DBS_BLOB_LEN, ...) and FieldInfo(DBS_BLOB_POINTER, ...) to directly access BLOB fields using low-level functions, such as FRead().
DBI_BLOB_INTEGRITY	Tests a BLOB file for the integrity of its internal tables and returns a logical value indicating the success (TRUE) or failure (FALSE) of the integrity check. This should not generally be necessary, but it is handy if the file's integrity is in question for any reason. This does not test the integrity between the .DBF and the BLOB file.
	If the integrity check fails, you can run Info(DBI_BLOB_RECOVER), which will automatically correct the BLOB file's tables, however, it will abandon some space within the file that would otherwise be reused.
	Important! DBServer:Info(DBI_BLOB_INTEGRITY) is a disk intensive operation and may slow down processing of the data server significantly, especially on a busy network.
DBI_BLOB_RECOVER	Recovers a damaged BLOB file by correcting its internal tables and returns NIL. You should run this only if DBServer:Info(DBI_BLOB_INTEGRITY) returns FALSE. Note that after running DBServer:Info(DBI_BLOB_RECOVER), the BLOB file loses some size efficiency.
DBI_BOF	Returns a logical value indicating the data server's beginning-of-file status (see DBServer:BOF).
DBI_CANPUTREC	Returns a logical value indicating whether the data server supports putting records.
DBI_CHILDCOUNT	Returns the number of relations set from this data server.
DBI_DB_VERSION	Returns the version number of the host RDD (CAVORDDB.DLL or CAVORDD.DLL).
DBI_DBFILTER	Returns the filter expression as a string (see DBServer:Filter).
DBI_EOF	Returns a logical value indicating the data server's end-of-file status (see DBServer:EOF).
DBI_FCOUNT	Returns the number of fields (see DBServer:FCount).
DBI_FILEHANDLE	Returns an IntPtr representing the file handle for this database file.
DBI_FILESTREAM	Returns a stream object representing the file stream for this database file.
DBI_FOUND	Returns a logical value indicating the success or filure of the last seek operation for this data server (see DBServer:Found).
DBI_FULLPATH	Returns the full path name of opened database file.
DBI_GETDELIMITER	Returns the default delimiter.
DBI_GETHEADERSIZE	Returns the header size of the file (see DBServer:Header).
DBI_GETLOCKARRAY	Returns the array of locked records.
DBI_GETRECSIZE	Returns the record size of the file (see DBServer:RecSize).
DBI_GETSCOPE	Returns the locate condition as a code block.
DBI_ISANSI	Returns the ANSI flag of the database file (TRUE for ANSI and FALSE for OEM).
DBI_ISDBF	Returns a logical value indicating whether the RDD provides support for the .DBF file format.
DBI_ISFLOCK	Returns the file lock status.
DBI_LASTUPDATE	Returns the last date on which the file was updated (see DBServer:LUpdate).
DBI_LOCKCOUNT	Returns the number of locked records.
DBI_LOCKOFFSET	Returns the current locking offset as a numeric value.
DBI_MEMOBLOCKSIZE	Returns the block size for the memo file associated with this database.
DBI_MEMOEXT	Returns the default extension for the memo file associated with this database.
DBI_MEMOHANDLE	Returns an intptr representing the DOS file handle for the memo file associated with this database file.
DBI_MEMOSTREAM	Returns a stream object representing the file stream for the memo file associated with this database file.
DBI_MEMOPATH	Returns the full path name of opened memo file.
DBI_RDD_VERSION	Returns the version number of the RDD for this database.
DBI_SETDELIMITER	Sets the default delimiter.
DBI_SHARED	Returns the shared flag value.
DBI_TABLEEXT	Returns the database file extension.
DBI_VALIDBUFFER	Returns a logical value indicating whether the current buffer is valid.
DBI_USER	Start of user defined values.

Examples

The following examples return data server information:

Copy

1// Same as oDBServer:Header
2oDBServer:Info(DBI_GETHEADERSIZE)
3// Same as oDBServer:LUpdate
4oDBServer:Info(DBI_LASTUPDATE)
5// Same as oDBServer:RecSize
6oDBServer:Info(DBI_GETRECSIZE)
7// Get the full path
8oDBServer:Info(DBI_FULLPATH)

Reference

DbServer Class

VO Namespace