Cobol file match
时间: 2023-12-23 16:51:04 浏览: 24
COBOL file match is a process of comparing two or more files in COBOL programming language. It is often used in data processing tasks, such as updating, merging, or reconciling records from different sources.
To perform a file match in COBOL, you need to define the files to be compared and specify the criteria for matching records. This can be done using the COBOL file handling statements, such as OPEN, READ, WRITE, and CLOSE.
Here is an example of how to perform a simple file match in COBOL:
```
SELECT FILE1 ASSIGN TO "file1.dat".
SELECT FILE2 ASSIGN TO "file2.dat".
OPEN FILE1.
OPEN FILE2.
READ FILE1 INTO RECORD1.
READ FILE2 INTO RECORD2.
PERFORM UNTIL FILE1-STATUS NOT = "00" OR FILE2-STATUS NOT = "00"
IF RECORD1 = RECORD2
DISPLAY "Match found: " RECORD1
ELSE IF RECORD1 < RECORD2
READ FILE1 INTO RECORD1
ELSE
READ FILE2 INTO RECORD2
END-IF
END-PERFORM.
CLOSE FILE1.
CLOSE FILE2.
```
In this example, two files (FILE1 and FILE2) are opened and read into two record variables (RECORD1 and RECORD2) respectively. The files are then compared using a loop that continues until the end of either file is reached. If a match is found, the record is displayed. If not, the loop continues to read the next record from the file with the lower value until a match is found. Finally, both files are closed.