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Undelete Record function

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  • Undelete Record function

    Here's my current version of an Undelete UDF (User-Defined Function). It is shown below and as an attached zip file.

    Note that it exits early if all records have been undeleted or if there are no records to undelete. Also there are optional filters and record # ranges, and an option to mark or not the undeleted records.

    Regards,

    Ira J. Perlow
    Computer Systems Design & Associates
    [email protected]

    Code:
    function UndeleteRecords as N(TableName as C,Options as C,Filter as C)
    ' Created by Computer Systems Design & Associates
    ' Copyright 2001 Computer Systems Design & Associates, All Rights Reserved
    ' Last Update: June 15, 2001
    
    ' Input: TableName	= Table (dbf) name to delete.  
    '							  If Null, it then prompts you for tables in the current database
    '							  If blank (but not null), it uses the current table
    '							  If "*", It prompts you for any table
    '			Options		= "I" - Display information before running with choice to cancel
    '							  "M" - Mark records that were undeleted
    '							  "R" - Prompt for record range
    '							  "F" - Prompt for filter
    '								if null, then IRM options are selected
    '			Filter		= Filter (in context of table) expression to process undelete for
    '							  If blank or null, all records will be processed
    '							  The filter expression may not be able to access the table fields unless
    '							  the current form's table is used
    
    ' Output:	Number of records that were undeleted
    '				Negative number indicates error
    
    ' Errors:	-1 = Cancelled operation
    '				-2 = Table name not found
    '				-3 = Table not available
    '				-4 = Other errors
    
    ' Typical Usage:
    '		Place a button on table to delete records with a function call like the example in it's code
    
    ' Examples:
    '		UndeleteRecords("tablename","IRM","")
    
    ' Notes: 
    '	The filter expression may not be able to access the table fields unless
    '	the current form's table is used
    
    ' Set default error return
    UndeleteRecords=-4
    
    If Options=="" 
    	Opt="IRM"
    ELSE
    	Opt=trim(Options)
    End If
    
    ' If not blank and not asterisk, use the supplied tablename
    IF .NOT.(TRIM(TableName)=="").AND..NOT.(ALLTRIM(TableName)=="*")
    	' If file does not exist, then return
    	IF .not.:File.Exists(TableName)
    		UndeleteRecords=-2
    		END
    	END IF
    	' Use the supplied Tablename
    	TabNam=TableName
    else if TableName==""
    	dim tlist[100] as C
    	tname=:A5.table_enum("")
    
    	IF .NOT.(trim(tname)=="")
    		' While the table_enum method returns 
    		' nonblank names, get next name
    		i=1
    		WHILE .not.(trim(tname)=="")
    			tlist[i]=tname
    			i=i+1
    			tname=:A5.table_enum(tname)
    		END WHILE
    		' sort the array otherwise names will be in 
    		' order in which operations were created.
    		sort_array("tlist")
    		' Show the user a list of names
    		choice=ui_get_list_array("Select Table to Undelete",1,"tlist")
    		' If the user selects a table, then do it
    		IF TRIM(choice)==""
    			UndeleteRecords=-1
    			END
    		END IF
    		getpath=IF(trim(:A5.Get_Master_Path())=="",:A5.Get_Path(),:A5.Get_Master_Path())
    		IF .NOT.:File.Exists(getpath+chr(92)+choice+".dbf")
    			UndeleteRecords=-2
    			END
    		END IF
    		TabNam=getpath+chr(92)+choice+".dbf"
    	END IF
    ELSE IF TRIM(TableName)=="" 
    	TabNam=table.current().Name_Get()+".dbf"
    ELSE
    	choice=ui_get_file("Table to Undelete Records:","Table(*.dbf)",table.current().Name_Get()+".dbf","X")
    	IF TRIM(choice)==""
    		UndeleteRecords=-1
    		END
    	END IF
    	TabNam=choice
    END IF
    'trace.writeln("Table selected="+TabNam)
    
    ' Save status of table being opened
    IF :Table.IsOpen(TabNam)
    	opened=1
    ELSE
    	opened=0
    END IF
    
    ' Set Flag to trap errors
    ErrFlag=0
    ON ERROR GOTO error_handler
    tbl=table.open(TabNam)
    ON ERROR GOTO 0
    
    ' If error in opening file, then exit with error
    IF  ErrFlag=1
    	UndeleteRecords=-3
    	END
    END IF 
    
    ' Counts of Regular and deleted records
    reccnt=tbl.records_get()
    recdel=tbl.records_deleted()
    
    IF "I" $ UPPER(Opt)
    	txt="Table: "+tabnam+CHR(10)+CHR(13)
    	txt=txt+"  Total Records: "+STR(reccnt+recdel,7,0)+CHR(10)+CHR(13)
    	txt=txt+"Deleted Records: "+STR(recdel,7,0)
    	choicen=ui_msg_box("Undelete Records?",txt,UI_OK_CANCEL+UI_QUESTION_SYMBOL+UI_SECOND_BUTTON_DEFAULT)
    	IF .not.(UI_OK_SELECTED=choicen)
    		UndeleteRecords=-1
    
    		' If the table was previously closed, close it now
    		IF opened=0
    			tbl.close() 
    		END IF
    
    		END
    	END IF
    END IF
    
    ' Exit if nothing to do
    IF recdel=0
    	UndeleteRecords=0
    	END 
    END IF
    
    IF "F" $ UPPER(Opt)
    	IF trim(filter)=="" 
    		dflt=".T."
    	ELSE
    		dflt=alltrim(filter)
    	END IF
    	choice=ui_get_expr("Enter Filter Expression","Filter:",dflt)
    	IF TRIM(choice)==""
    		UndeleteRecords=-1
    
    		' If the table was previously closed, close it now
    		IF opened=0
    			tbl.close() 
    		END IF
    
    		END
    	END IF
    	filtexp=alltrim(choice)
    ELSE
    	IF trim(filter)=="" 
    		dflt=".T."
    	ELSE
    		dflt=alltrim(filter)
    	END IF
    	filtexp=dflt
    END IF
    
    IF "R" $ UPPER(Opt)
    	choice=ui_get_number("Record Range for Undelete","Max Record="+LTRIM(STR(reccnt+recdel))+"   Begin Record #:","1")
    	IF (0>=VAL(choice)).or.(VAL(choice)>reccnt+recdel)
    		UndeleteRecords=-1
    
    		' If the table was previously closed, close it now
    		IF opened=0
    			tbl.close() 
    		END IF
    
    		END
    	END IF
    	rangebeg=VAL(choice)
    
    	choice=ui_get_number("Record Range for Undelete","Max Record="+LTRIM(STR(reccnt+recdel))+"     End Record #:",LTRIM(STR(reccnt+recdel)))
    	IF (0>=VAL(choice)).or.(VAL(choice)>reccnt+recdel).or.(rangebeg>VAL(choice))
    		UndeleteRecords=-1
    
    		' If the table was previously closed, close it now
    		IF opened=0
    			tbl.close() 
    		END IF
    
    		END
    	END IF
    	rangeend=VAL(choice)
    ELSE
    	rangebeg=1
    	rangeend=reccnt+recdel
    END IF
    
    Undeleted=0
    
    i=1
    ' Get pointer to delete/mark field
    ' Field contains "-" (Dash) for Marked, "*" (Asterick) for Deleted,
    '	 " " (space) for regular record
    fld=tbl.field_get(0)
    
    i=rangebeg
    ON ERROR GOTO error_handler
    
    nxt:
    
    	tbl.fetch_goto(i)
    	IF tbl.is_deleted()
    		tbl.change_begin()
    		ErrFlag=0
    		fil=eval(filtexp)
    		IF ErrFlag=1
    			fil=.T.
    			'trace.writeln("rec #="+LTRIM(STR(i))+"default")
    		ELSE
    			'trace.writeln("rec #="+LTRIM(STR(i))+"  filter="+IF(fil,".T.",".F."))
    		END IF
    		IF eval(filtexp)
    			IF "M" $ UPPER(Opt)
    				' Mark record
    				tbl.mark()
    				' Alternative way to do the mark
    				'fld.value_put("-")
    			ELSE
    				' Undelete record
    				fld.value_put(" ")
    			END IF
    			Undeleted=Undeleted+1
    		END IF
    
    		tbl.change_end(.t.)
    	END IF
    	i=i+1
    ' If some records still deleted and range has not yet been reached, repeat
    IF rangeend>=i.and.recdel>Undeleted
    	GOTO nxt 
    END IF
    
    ON ERROR GOTO 0
    
    ' New counts of Regular and deleted records
    newcnt=tbl.records_get()
    newdel=tbl.records_deleted()
    
    ' If the table was previously closed, close it now
    IF opened=0
    	tbl.close() 
    END IF
    
    UndeleteRecords=Undeleted
    
    ui_msg_box("Undelete Results","Undeleted "+LTRIM(STR(Undeleted))+" records in table"+CHR(10)+CHR(13)+tabnam,UI_OK+UI_INFORMATION_SYMBOL)
     
    END
    
    ' Error handler
    error_handler:
    ErrFlag=1
    'errcode=error_code_get()
    'errmsg=error_text_get(err)
    RESUME NEXT
    
    END
    
    end function
    Last edited by AaronBBrown; 01-09-2007, 12:41 PM.
    Regards,

    Ira J. Perlow
    Computer Systems Design


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  • #2
    RE: Undelete Record function

    Smarty pants. Just kidding! i am humbly educated, now, and will save your instructions for future use!
    Thanks,
    Wanda

    Comment

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