| SE_log_combine | |
Combines two log files with a Boolean operation
LONG SE_log_combine (SE_CONNECTION connection, const CHAR *logfile1, const CHAR *logfile2, const CHAR *logfile12, LONG operation);
| connection | The connection handle |
| logfile1 | The name of the first input log file; may be a user name file name |
| logfile2 | The name of the second input log file; may be a user name file name |
| logfile12 | The name of the output log file; the name must be a simple log file name that cannot include a user name. |
| operation | The Boolean operation to perform |
SE_log_combine performs a Boolean set operation on a pair of input log files, producing a third output log file. The output log file can be one of the input log files.
If the output log file is one of the input log files, it will be overwritten. If the output log file is not one of the input log files and if it already exists, the SE_LOG_EXISTS (-252) error is returned; otherwise, a new log file will be created. If SE_log_combine is successful, it returns the number of rows in the new log file.
The four operations supported between log files are:
|
SE_LOG_INTERSECT |
All row IDs present in both input log files are copied to the output log file. Those row IDs present in only one log file are discarded. This is a Boolean AND operation. |
|
SE_LOG_UNION |
All row IDs present in either input log files are copied to the output log file. Duplicate rows appear only once in the output log file. This is a Boolean OR operation. |
|
SE_LOG_DIFFERENCE |
All rows present in the first log file but not in the second log file are copied to the output logfile. This is a Boolean INHIBITION operation. |
|
SE_LOG_SYMDIFF |
All rows present in either of the input log files, but not present in both, are copied to the output log file. This is a Boolean XOR operation. |
If successful, the number of rows in the new log file is returned. If unsuccessful, one of the following is returned:
SE_FAILURE
SE_INVALID_PARAM_VALUE
SE_INVALID_POINTER
SE_LOG_IO_ERROR
SE_LOG_NOEXIST
SE_LOG_NOACCESS
SE_LOG_NOTOPEN
SE_NET_FAILURE
SE_OUT_OF_SVMEM
SE_SDE_NOT_STARTED
SE_TEMP_IO_ERROR
∙ The output log file is a temporary log file sorted in ascending order. Change it to a persistent log file with SE_log_set_type. The input log files must not be opened.