Optimize/:extract error variable

magic-api/src/main/java/org/ssssssss/magicapi/backup/service/MagicDatabaseBackupService.java

@@ -47,6 +47,10 @@ public class MagicDatabaseBackupService implements MagicBackupService {
 
 	private static final Logger logger = LoggerFactory.getLogger(MagicDatabaseBackupService.class);
 
+	private static final String BACKUP_ERROR = "备份失败";
+
+	private static final String RM_BACKUP_ERROR = "删除备份失败";
+
 	public MagicDatabaseBackupService(JdbcTemplate template, String tableName) {
 		this.template = template;
 		this.template.setMaxRows(FETCH_SIZE);
@@ -83,7 +87,7 @@ public class MagicDatabaseBackupService implements MagicBackupService {
 			}
 			template.update(INSERT_SQL, backup.getId(), backup.getCreateDate(), backup.getTag(), backup.getType(), backup.getName(), backup.getCreateBy(), backup.getContent());
 		} catch (Exception e) {
-			logger.warn("备份失败", e);
+			logger.warn(BACKUP_ERROR, e);
 		}
 	}
 
@@ -117,7 +121,7 @@ public class MagicDatabaseBackupService implements MagicBackupService {
 		try {
 			return template.update(DELETE_BY_TIMESTAMP, timestamp);
 		} catch (Exception e) {
-			logger.warn("删除备份失败", e);
+			logger.warn(RM_BACKUP_ERROR, e);
 			return -1;
 		}
 	}