DOCUMENT:Q116037 10-FEB-2000 [foxpro] TITLE :How to Perform REPLACE for Two Databases w/ Common Field PRODUCT :Microsoft FoxPro PROD/VER:MACINTOSH:2.5x,2.6a; MS-DOS:2.5x,2.6x; WINDOWS:2.5x,2.6x,3.0 OPER/SYS: KEYWORDS:kbcode ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual FoxPro for Windows, version 3.0 - Microsoft FoxPro for Windows, versions 2.5x, 2.6x - Microsoft FoxPro for MS-DOS, versions 2.5x, 2.6x - Microsoft FoxPro for Macintosh, versions 2.5x, 2.6a ------------------------------------------------------------------------------- SUMMARY ======= To update more than one record in a database from another, similar database, you may need to check for an end-of-file (EOF) marker during each iteration of the REPLACE operation. This is best accomplished with a DO ... WHILE loop, as demonstrated below. NOTE: In order for this process to work, the two databases must have a common key field. MORE INFORMATION ================ To demonstrate this process, we'll use the CUSTOMER database in the FoxPro TUTORIAL subdirectory. First, we'll copy CUSTOMER to a new database called NEWCUST, then we'll delete the contents of the COMPANY field, and then we'll restore the contents of the COMPANY field using the COMPANY field information in CUSTOMER. 1. Set the default directory to the location of CUSTOMER.DBF. For example, in FoxPro 2.x, issue the following command in the Command window: SET DEFAULT TO C:\\TUTORIAL. In Visual FoxPro, Issue the following: SET DEFAULT TO C:\\SAMPLES\DATA NOTE: In Visual FoxPro, you will also need to change all references below from from CNO to CUST_ID. 2. In the Command window, issue the following commands: USE customer COPY TO newcust SELECT 0 USE newcust ** the following command has no spaces between the quotation marks REPLACE ALL company WITH "" ** BROWSE the table with the empty COMPANY field contents BROWSE CLEAR ALL CLOSE ALL ** open a new program file called TEST ** if a program called TEST already exists, choose another name MODIFY COMMAND test 3. In the edit window for the TEST program, type the following commands: SELECT 0 USE customer SELECT 0 USE newcust SELECT customer ** while not at end of file of CUSTOMER, do some actions DO WHILE !EOF() ** select the destination table SELECT newcust ** replace the empty COMPANY field with data from CUSTOMER where ** the common key field is the same REPLACE newcust.company WITH customer.company; FOR newcust.cno = customer.cno ** select the source table again to go to next record SELECT customer SKIP ENDDO SELECT newcust ** BROWSE the table with the newly filled COMPANY data BROWSE NOTE: If the first database (that is, CUSTOMER) is indexed on the common key field between the two tables, replace the commands in step 3 with the following: SELECT 0 USE customer ORDER TAG cno SELECT 0 USE newcust REPLACE ALL newcust.company WITH customer.company FOR ; seek(cno,"customer") 4. Save TEST.PRG and then run it. REFERENCES ========== "Language Reference," (Windows and MS-DOS) pages L3-312, L3-470, L3-480, L3- 816, L3-861, L3-1040, L3-1108 "Language Reference," (Macintosh) pages 271, 396, 404, 651, 685, 827, 884 Additional query words: FoxMac FoxDos FoxWin VFoxWin 2.50 2.50a 2.50b 2.50c 2.60 ====================================================================== Keywords : kbcode Technology : kbHWMAC kbOSMAC kbVFPsearch kbAudDeveloper kbFoxproSearch kbZNotKeyword3 kbFoxPro260aMac kbVFP300 Version : MACINTOSH:2.5x,2.6a; MS-DOS:2.5x,2.6x; WINDOWS:2.5x,2.6x,3.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.