#!/usr/bin/env python# -*- encoding: utf8 -*-import calendarimport timeimport osimport sysfrom datetime import datetime,timedeltaimport mysql.connector# 定义一些全局变量work_dir = "G:/"argv_var_name=sys.argvargv_database_name =""argv_table_name = ""getdbconfig_0_152 = { 'host': '127.0.0.1', 'user': 'root', 'password': 'root', 'port': '3306'}# 此函数用来打印输出制定内容，第一个变量是输出内容，第二个变量是文件前缀，第三个变量是后缀名def print_log(print_content,db_name,filename,suffix): my_log_day = time.strftime("%Y%m%d") my_log_file="%s%s_%s_%s.%s" %(work_dir,db_name,filename,my_log_day,suffix) #with open(my_log_file, "aw") as f: with open(my_log_file, "a") as f: f.write( print_content+"\n") f.close()# 此函数用来指定某个月增加一个月def add_month(srcDate, addMonths): if not srcDate or not srcDate: pass if addMonths < 1: return srcDate month = srcDate.month - 1 + addMonths year = srcDate.year + month / 12 month = month % 12 + 1 day = min(srcDate.day, calendar.monthrange(year, month)[1]) return srcDate.replace(year=year, month=month, day=day)def select_any_sql(getdbconfig,select_sql): select_any_sql_cnn = mysql.connector.connect(host=getdbconfig['host'] , user=getdbconfig['user'], password=getdbconfig['password'],port=getdbconfig['port']) select_any_sql_cursor = select_any_sql_cnn.cursor() select_any_sql_cursor.execute(select_sql) select_any_sql_data = select_any_sql_cursor.fetchone() select_any_sql_cnn.close return select_any_sql_data# 此函数用来导入数据def import_dump_sql(getdbconfig, dumpsql): import_host = getdbconfig['host'] import_db = getdbconfig['database'] import_user = getdbconfig['user'] import_password = getdbconfig['password'] import_port = getdbconfig['port'] mysqlimport = " mysql -h%s -u%s -p%s -P%s %s < %s " % (import_host, import_user, import_password, import_port, import_db, dumpsql) os.system(mysqlimport)def select_partition(getdbconfig): if len(argv_var_name) == 1: argv_database_name = "" argv_table_name = "" elif len(argv_var_name) == 2: argv_database_name = argv_var_name[1] argv_table_name = "" elif len(argv_var_name) == 3: argv_database_name = argv_var_name[1] argv_table_name = argv_var_name[2] else: print "Warning!!!! up to three parameters can be specified!!!!" if argv_database_name == "": partition_info_table_schema = "" else: partition_info_table_schema = "and table_schema='%s'" % (argv_database_name) if argv_table_name == "": partition_info_table_name = "" else: partition_info_table_name = "and table_name='%s'" %(argv_table_name) select_partition_sql = "SELECT table_schema,table_name,PARTITION_NAME,PARTITION_ORDINAL_POSITION,PARTITION_METHOD,PARTITION_EXPRESSION,PARTITION_DESCRIPTION FROM information_schema.`PARTITIONS` " \ "WHERE table_schema not in ('information_schema','performance_schema','mysql','test','sqlexe') %s %s and PARTITION_NAME is not null order by table_schema,PARTITION_NAME, PARTITION_ORDINAL_POSITION;" %(partition_info_table_schema,partition_info_table_name) partition_contain_before = () partition_info = [] auto_create_partition_filename=[] partition_info_not_in_range=[] cnn = mysql.connector.connect(**getdbconfig) cursor = cnn.cursor() cursor.execute(select_partition_sql) for (table_schema, table_name, PARTITION_NAME, PARTITION_ORDINAL_POSITION, PARTITION_METHOD, PARTITION_EXPRESSION,PARTITION_DESCRIPTION) in cursor: PARTITION_ORDINAL_POSITION_NUM = int(PARTITION_ORDINAL_POSITION) - 1 if PARTITION_DESCRIPTION == 'MAXVALUE': select_paritition_description_sql = "SELECT PARTITION_NAME AS PARTITION_NAME_BEFORE,PARTITION_DESCRIPTION AS PARTITION_DESCRIPTION_BEFORE FROM information_schema.`PARTITIONS` " \ "WHERE table_schema='%s' and table_name='%s' and PARTITION_ORDINAL_POSITION='%s' ;" % (table_schema, table_name, PARTITION_ORDINAL_POSITION_NUM) mysql_select_cnn = mysql.connector.connect(**getdbconfig) mysql_select_cursor = mysql_select_cnn.cursor() mysql_select_cursor.execute(select_paritition_description_sql) for (PARTITION_NAME_BEFORE, PARTITION_DESCRIPTION_BEFORE) in mysql_select_cursor: partition_contain_before = (table_schema, table_name, PARTITION_NAME, PARTITION_NAME_BEFORE, PARTITION_METHOD,PARTITION_DESCRIPTION, PARTITION_DESCRIPTION_BEFORE) partition_info.append(partition_contain_before) mysql_select_cnn.close if len(partition_info) == 0: print "PARTITION in the Database does not exist!!!" else: for i in partition_info: #print "database:", i[0] if i[4] == 'RANGE': # 此部分数据用于生成alter table drop 语句 alter table t_lgj_log add PARTITION(PARTITION p201804 VALUES LESS THAN (737150)); select_max_partition_name_sql = "select count(*) as COUNT from %s.%s partition(%s)" % (i[0], i[1], i[2]) max_partition_name_count = select_any_sql(getdbconfig, select_max_partition_name_sql)[0] if max_partition_name_count==0: prompt_database="-- database : %s" %(i[0]) print_log(prompt_database,i[0], "auto_create_partition", "sql") print_user_database="use %s;" %(i[0]) print_log(print_user_database, i[0],"auto_create_partition", "sql") sql_alter_table_drop_partition = "alter table %s.%s drop PARTITION %s;" % (i[0], i[1], i[2]) # auto_create_partition 指的是用于自动删除最大分区并添加分区的脚本 print_log(sql_alter_table_drop_partition,i[0], "auto_create_partition", "sql") else: return_info_can_not_drop_max_partition = "%s.%s.%s" % (i[0], i[1], i[2]) # can_not_drop_max_partition 指的是最大分区中有数据，然后这部分数据并不能直接删除，把这些分区信息记录下来 print_log(return_info_can_not_drop_max_partition, i[0],"can_not_drop_max_partition", "sql") # 此部分数据用于生成alter table add 语句 alter table t_lgj_log add PARTITION(PARTITION p201804 VALUES LESS THAN (737150)); select_next_paritition_description_name="select from_days(%s);" %(i[6]) maxvalue_date=add_month(select_any_sql(getdbconfig, select_next_paritition_description_name)[0],1).strftime('%Y-%m-%d') maxvalue_date_year_month=add_month(select_any_sql(getdbconfig, select_next_paritition_description_name)[0],1).strftime('%Y%m') add_partition_name_01="p%s" %(maxvalue_date_year_month) # 此部分用于判断生成的 PARTITION_NAME 是否已经存在，如果存在，则需要在月份上加1 if add_partition_name_01 == i[3]: add_partition_name=add_partition_name_01 else: maxvalue_date_year_month_01=add_month(add_month(select_any_sql(getdbconfig, select_next_paritition_description_name)[0],1),1).strftime('%Y%m') add_partition_name = "p%s" % (maxvalue_date_year_month_01) less_than_sql="select to_days('%s')" %(maxvalue_date) less_than_name=select_any_sql(getdbconfig,less_than_sql)[0] sql_alter_table_add_partition="alter table %s.%s add PARTITION(PARTITION %s VALUES LESS THAN (%s));" %(i[0], i[1],add_partition_name,less_than_name) print_log(sql_alter_table_add_partition, i[0],"auto_create_partition", "sql") else: # can_not_drop_max_partition 指的是分区规则并不是range分区，把这些分区信息记录下来 print_log(i, i[0],"partition_info_not_in_range", "sql") # 记录保存的文件名到auto_create_partition_filename 列表 my_log_day = time.strftime("%Y%m%d") partition_filename="%s_%s_%s.sql" %(i[0],"auto_create_partition",my_log_day) auto_create_partition_filename.append(partition_filename) cnn.close # auto_create_partition_filename 列表记录了保存可以执行SQL文件名，如果列表不为空，直接调用 import_dump_sql 函数执行里面的SQL ，其中不同的库保存在不同的文件 if len(auto_create_partition_filename)>0: for i in auto_create_partition_filename: filename="%s%s" %(work_dir,i) #import_dump_sql(getdbconfig,filename) print "Done!!!", filename else: print "PARTITION in the Database does not exist!!!"select_partition(getdbconfig_0_152)