echo"mysqldump -u${source_db_user} -p${source_db_pwd} -h${source_db_host} -P${port}$database_name --tables $table_name --where \"1=1 order by id desc limit 1000\"> $file_name"
mysqldump -u${source_db_user}-p${source_db_pwd}-h${source_db_host}-P${port}$database_name--skip-lock-tables--tables$table_name--where"1=1 order by id desc limit 10000"--skip-add-locks--no-create-info--complete-insert>$file_name
mysqldump -u${source_db_user}-p${source_db_pwd}-h${source_db_host}-P${port}$database_name--skip-lock-tables--tables$table_name--where"1=1 order by id desc limit 1000"--skip-add-locks--no-create-info--complete-insert--replace>$file_name