基于Python的SQL Server数据库实现对象同步轻量级_Sql Server

缘由

日常工作中经常遇到类似的问题：把某个服务器上的某些指定的表同步到另外一台服务器。

类似需求用SSIS或者其他ETL工作很容易实现，比如用SSIS的话，就会会存在相当一部分反复的手工操作。

建源的数据库信息，目标的数据库信息，如果是多个表，需要一个一个地拉source和target，然后一个一个地mapping，然后运行实现数据同步。

然后很可能，这个workflow使用也就这么一次，就寿终正寝了，却一样要浪费时间去做这个ETL。

快速数据同步实现

于是在想，可不可能快速实现类似需求，尽最大程度减少重复的手工操作？类似基于命令行的方式，简单快捷，不需要太多的手动操作。

于是就有了本文，基于Python（目的是顺便熟悉一下Python的语法），快速实现SQL Server的数据库之间的数据同步操作，后面又稍微扩展了一下，可以实现不同服务器的数据库之间的表结构，表对应的数据，存储过程，函数，用户自定义类型表（user define table type）的同步

目前支持在两个SQL Server数据源之间：每次同步一张或者多张表/存储过程，也可以同步整个数据库的所有表/存储过程（以及表/存储过程依赖的其他数据库对象）。

支持sqlserver2012以上版本

需要考虑到一些基本的校验问题：在源服务器上，需要同步的对象是否存在，或者输入的对象是否存在于源服务器的数据库里。

在目标服务器上，对于表的同步：

1，表的存在依赖于schema，需要考虑到表的schema是否存在，如果不存在先在target库上创建表对应的schema

2，target表中是否有数据？如果有数据，是否以覆盖的方式执行

对于存储过程的同步：

1，类似于表，需要考虑存储过程的schema是否存在，如果不存在先在target库上创建表对应的schema
2，类似于表，arget数据库中是否已经存在对应的存储过程，是否以覆盖的方式执行
3，存储过程可能依赖于b表，某些函数，用户自定义表变量等等，同步存储过程的时候需要先同步依赖的对象，这一点比较复杂，实现过程中遇到在很多很多的坑

　可能存在对象A依赖于对象B，对象B依赖于对象C……，这里有点递归的意思

　这一点导致了重构大量的代码，一开始都是直来直去的同步，无法实现这个逻辑，切实体会到代码的“单一职责”原则

参数说明

参数说明如下，大的包括四类：

1，源服务器信息（服务器地址，实例名，数据库名称，用户名，密码），没有用户名密码的情况下，使用windows身份认证模式

2，目标服务器信息（服务器地址，实例名，数据库名称，用户名，密码），没有用户名密码的情况下，使用windows身份认证模式

3，同步的对象类型以及对象

4，同步的对象在目标服务器上存在的情况下，是否强制覆盖

基于Python的SQL Server数据库实现对象同步轻量级

其实在同步数据的时候，也可以把需要同步的行数提取出来做参数，比较简单，这里暂时没有做。

比如需要快速搭建一个测试环境，需要同步所有的表结构和每个表的一部分数据即可。

表以及数据同步

表同步的原理是，创建目标表，遍历源数据的表，生成insert into values(***),(***),(***)格式的sql，然后插入目标数据库，这里大概步骤如下：

1，表依赖于schema，所以同步表之前先同步schema

2，强制覆盖的情况下，会drop掉目标表（如果存在的话），防止目标表与源表结构不一致，非强制覆盖的情况下，如果字段不一致，则抛出异常

3，同步表结构，包括字段，索引，约束等等，但是无法支持外键，刻意去掉了外键，想想为什么？因吹斯汀。

4，需要筛选出来非计算列字段，insert语句只能是非计算列字段（又导致重构了部分代码）

5，转义处理，在拼凑SQL的时候，需要进行转义处理，否则会导致SQL语句错误，目前处理了字符串中的'字符，二进制字段，时间字段的转义处理（最容易发生问题的地方）

6，鉴于insert into values(***),(***),(***)语法上允许的最大值是1000，因此每生成1000条数据，就同步一次

7，自增列的identity_insert 标识打开与关闭处理

使用如下参数，同步源数据库的三张表到目标数据库，因为这里是在本机命名实例下测试，因此实例名和端口号输入

执行同步的效果

基于Python的SQL Server数据库实现对象同步轻量级

说明：

1，如果输入obj_type="tab" 且-obj=为None的情况下，会同步源数据库中的所有表。
2，这个效率取决于机器性能和网络传输，本机测试的话，每秒中可以提交3到4次，也就是每秒钟可以提交3000~4000行左右的数据。

已知的问题：

1，当表的索引为filter index的时候，无法生成包含where条件的索引创建语句，那个看起来蛋疼的表结构导出语句，暂时没时间改它。
2，暂时不支持其他少用的类型字段，比如地理空间字段什么的。

存储过程对象的同步

存储过程同步的原理是，在源数据库上生成创建存储过程的语句，然后写入目标库，这里大概步骤如下：
1，存储过程依赖于schema，所以同步存储过程之前先同步schema（同表）
2，同步的过程会检查依赖对象，如果依赖其他对象，暂停当前对象同步，先同步依赖对象
3，重复第二步骤，直至完成
4，对于存储过程的同步，如果是强制覆盖的话，强制覆盖仅仅对存储过程自己生效（删除&重建），对依赖对象并不生效，如果依赖对象不存在，就创建，否则不做任何事情

使用如下参数，同步源数据库的两个存储过程到目标数据库，因为这里是在本机命名实例下测试，因此实例名和端口号输入

说明：测试要同步的存储过程之一为[dbo].[sp_test01]，它依赖于其他两个对象：dbo.table01和dbo.fn_test01()

				?

									create proc [dbo].[sp_test01]

									as

									begin

									 set no count on;

									 delete from dbo.table01 where id = 1000

									 select dbo.fn_test01()

									end

而dbo.fn_test01()的如下，依赖于另外一个对象：dbo.table02

				?

									create function [dbo].[fn_test01]

									(

									)

									RETURNS int

									AS

									BEGIN 

									 declare @count int = 0

									 select @count = count(1) from dbo.table02

									 return @count

									END

因此，这个测试的[dbo].[sp_test01]就依赖于其他对象，如果其依赖的对象不存在，同步的时候，仅仅同步这个存储过程本身，是没有意义的

同步某一个对象的依赖对象，使用如下SQL查出来对象依赖信息，因此这里就层层深入，同步依赖对象。
这里就类似于同步A的时候，A依赖于B和C，然后停止同步A，先同步B和C，同步B或者C的时候，可能又依赖于其他对象，然后继续先同步其依赖对象。

基于Python的SQL Server数据库实现对象同步轻量级

效果如下

基于Python的SQL Server数据库实现对象同步轻量级

如果输入obj_type="sp" 且-obj=为None的情况下，会同步源数据库中的所有存储过程以及其依赖对象

已知的问题：

1，加密的存储过程或者函数是无法实现同步的，因为无法生成创建对象的脚本
1，table type的同步也是一个蛋疼的过程，目前支持，但是支持的并不好，原因是创建table type之前，先删除依赖于table type的对象，否则无法删除与创建。

特别说明

依赖对象的解决，还是比较蛋疼的

如果在默认schema为dbo的对象，在存储过程或者函数中没有写schema（参考如下修改后的sp，不写相关表的schema dbo，dbo.test01==>test01），
使用 sys.dm_sql_referenced_entities这个系统函数是无法找到其依赖的对象的,奇葩的是可以找到schema的类型，却没有返回对象本身。

这一点导致在代码中层层深入，进行了长时间的debug，完全没有想到这个函数是这个鸟样子，因为这里找到依赖对象的类型，却找不到对象本身，次奥！！！
另外一种情况就是动态SQL了，无法使用 sys.dm_sql_referenced_entities这个系统函数找到其依赖的对象。

基于Python的SQL Server数据库实现对象同步轻量级

其他对象的同步

　　支持其他数据库对象的同步，比如function，table type等，因为可以在同步其他存储过程对象的时候附带的同步function，table type，这个与表或者存储过程类似，不做过多说明。　

已知问题：

1，201906122030：经测试，目前暂时不支持Sequence对象的同步。

需要改进的地方

1，代码结构优化，更加清晰和条例的结构（一开始用最直接简单粗暴的方式快速实现，后面重构了很多代码，现在自己看起来还有很多不舒服的痕迹）
2，数据同步的效率问题，对于多表的导入导出操作，依赖于单线程，多个大表导出串行的话，可能存在效率上的瓶颈，如何根据表的数据量，尽可能平均地分配多多个线程中，提升效率
3，更加友好清晰的异常提示以及日志记录，生成导出日志信息。
4，异构数据同步，MySQL《==》SQL Server《==》Oracle《==》PGSQL

代码端午节写好了，这几天抽空进行了一些测试以及bug fix，应该还潜在不少未知的bug，工作量比想象中的大的多了去了。

				?

									# -*- coding: utf-8 -*-

									# !/usr/bin/env python3

									__author__ = 'MSSQL123'

									__date__ = '2019-06-07 09:36'

									import os

									import sys

									import time

									import datetime

									import pymssql

									from decimal import Decimal

									usage = '''

									     -----parameter explain-----

									     source database parameter

									     -s_h      : soure database host                     ----- must require parameter

									     -s_i      : soure database instace name                 ----- default instance name MSSQL

									     -s_d      : soure database name                     ----- must require parameter

									     -s_u      : soure database login                     ----- default windows identifier

									     -s_p      : soure database login password                ----- must require when s_u is not null

									     -s_P      : soure database instance port                 ----- default port 1433

									     target database parameter

									     -t_h      : target database host                     ----- must require parameter

									     -t_i      : target database instace name                 ----- default instance name MSSQL

									     -t_d      : target database name                     ----- must require parameter

									     -t_u      : target database login                    ----- default windows identifier

									     -t_p      : target database login password                ----- must require when s_u is not null

									     -t_P      : target database instance port                ----- default port 1433

									     sync object parameter

									     -obj_type   : table or sp or function or other databse object       ----- tab or sp or fn or tp

									     -obj      : table|sp|function|type name                 ----- whick table or sp sync

									     overwirte parameter

									     -f       : force overwirte target database object              ----- F or N 

									     --help: help document

									     Example:

									     python DataTransfer.py -s_h=127.0.0.1 -s_P=1433 -s_i="MSSQL" -s_d="DB01" -obj_type="tab" -obj="dbo.t1,dbo.t2" -t_h=127.0.0.1 -t_P=1433 -t_i="MSSQL" -t_d="DB02" -f="Y"          

									     python DataTransfer.py -s_h=127.0.0.1 -s_P=1433 -s_i="MSSQL" -s_d="DB01" -obj_type="sp" -obj="dbo.sp1,dbo.sp2" -t_h=127.0.0.1 -t_P=1433 -t_i="MSSQL" -t_d="DB02" -f="Y"

									     '''

									class SyncDatabaseObject(object):

									  # source databse

									  s_h = None

									  s_i = None

									  s_P = None

									  s_u = None

									  s_p = None

									  s_d = None

									  # obj type

									  s_obj_type = None

									  # sync objects

									  s_obj = None

									  # target database

									  t_h = None

									  t_i = None

									  t_P = None

									  t_u = None

									  t_p = None

									  t_d = None

									  f = None

									  file_path = None

									  def __init__(self, *args, **kwargs):

									    for k, v in kwargs.items():

									      setattr(self, k, v)

									  # connect to sqlserver

									  def get_connect(self, _h, _i, _P, _u, _p, _d):

									    cursor = False

									    try:

									      if (_u) and (_p):

									        conn = pymssql.connect(host=_h,

									                    server=_i,

									                    port=_P,

									                    user=_u,

									                    password=_p,

									                    database=_d)

									      else:

									        conn = pymssql.connect(host=_h,

									                    server=_i,

									                    port=_P,

									                    database=_d)

									      if (conn):

									        return conn

									    except:

									      raise

									    return conn

									  # check connection

									  def validated_connect(self, _h, _i, _P, _u, _p, _d):

									    if not (self.get_connect(_h, _i, _P, _u, _p, _d)):

									      print("connect to " + str(_h) + " failed,please check you parameter")

									      exit(0)

									  '''

									  this is supposed to be a valid object name just like xxx_name,or dbo.xxx_name,or [schema].xxx_name or schema.[xxx_name]

									  then transfer this kind of valid object name to format object name like [dbo].[xxx_name](give a default dbo schema name when no schema name)

									  other format object name consider as unvalid,will be rasie error in process

									  format object name

									    1,xxx_name       ======> [dbo].[xxx_name]

									    2,dbo.xxx_name     ======> [dbo].[xxx_name]

									    3,[schema].xxx_name   ======> [dbo].[xxx_name]

									    3,schema.xxx_name    ======> [schema].[xxx_name]

									    4,[schema].[xxx_name]  ======> [schema].[xxx_name]

									    5,[schema].[xxx_name  ======> rasie error format message

									  '''

									  @staticmethod

									  def format_object_name(name):

									    format_name = ""

									    if ("." in name):

									      schema_name = name[0:name.find(".")]

									      object_name = name[name.find(".") + 1:]

									      if not ("[" in schema_name):

									        schema_name = "[" + schema_name + "]"

									      if not ("[" in object_name):

									        object_name = "[" + object_name + "]"

									      format_name = schema_name + "." + object_name

									    else:

									      if ("[" in name):

									        format_name = "[dbo]." + name

									      else:

									        format_name = "[dbo]." + "[" + name + "]"

									    return format_name

									  '''

									  check user input object is a valid object

									  '''

									  def exits_object(self, conn, name):

									    conn = conn

									    cursor_source = conn.cursor()

									    # get object by name from source db

									    sql_script = r'''select top 1 1 from

									                (

									                  select concat(QUOTENAME(schema_name(schema_id)),'.',QUOTENAME(name)) as obj_name from sys.objects 

									                  union all

									                  select concat(QUOTENAME(schema_name(schema_id)),'.',QUOTENAME(name)) as obj_name from sys.types 

									                )t where obj_name = '{0}'

									                 '''.format(self.format_object_name(name))

									    cursor_source.execute(sql_script)

									    result = cursor_source.fetchall()

									    if not result:

									      return 0

									    else:

									      return 1

									    conn.cursor.close()

									    conn.close()

									  # table variable sync

									  def sync_table_variable(self, tab_name, is_reference):

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    if (self.exits_object(conn_source, self.format_object_name(tab_name))) > 0:

									      pass

									    else:

									      print("----------------------- warning message -----------------------")

									      print("--------warning: object " + tab_name + " not existing in source database ------------")

									      print("----------------------- warning message -----------------------")

									      print()

									      return

									    exists_in_target = 0

									    sql_script = r'''select top 1 1

									               from sys.table_types tp

									               where is_user_defined = 1 

									               and concat(QUOTENAME(schema_name(tp.schema_id)),'.',QUOTENAME(tp.name)) = '{0}' ''' \

									      .format((self.format_object_name(tab_name)))

									    # if the table schema exists in target server,skip

									    cursor_target.execute(sql_script)

									    exists_in_target = cursor_target.fetchone()

									    # weather exists in target server database

									    if (self.f == "Y"):

									      if (is_reference != "Y"):

									        # skiped,table type can not drop when used by sp

									        sql_script = r'''

									                     if OBJECT_ID('{0}') is not null

									                       drop type {0}

									                   '''.format(self.format_object_name(tab_name))

									        cursor_target.execute(sql_script)

									        conn_target.commit()

									    else:

									      if exists_in_target:

									        print("----------------------- warning message -----------------------")

									        print("the target table type " + tab_name + " exists ,skiped sync table type from source")

									        print("----------------------- warning message -----------------------")

									        print()

									        return

									    sql_script = r'''   

									                  DECLARE @SQL NVARCHAR(MAX) = ''

									                  SELECT @SQL =

									                  'CREATE TYPE ' + '{0}' + 'AS TABLE' + CHAR(13) + '(' + CHAR(13) +

									                  STUFF((

									                          SELECT CHAR(13) + '  , [' + c.name + '] ' +

									                            CASE WHEN c.is_computed = 1

									                              THEN 'AS ' + OBJECT_DEFINITION(c.[object_id], c.column_id)

									                              ELSE

									                                CASE WHEN c.system_type_id != c.user_type_id

									                                  THEN '[' + SCHEMA_NAME(tp.[schema_id]) + '].[' + tp.name + ']'

									                                  ELSE '[' + UPPER(y.name) + ']'

									                                END +

									                                CASE

									                                  WHEN y.name IN ('varchar', 'char', 'varbinary', 'binary')

									                                    THEN '(' + CASE WHEN c.max_length = -1

									                                            THEN 'MAX'

									                                            ELSE CAST(c.max_length AS VARCHAR(5))

									                                          END + ')'

									                                  WHEN y.name IN ('nvarchar', 'nchar')

									                                    THEN '(' + CASE WHEN c.max_length = -1

									                                            THEN 'MAX'

									                                            ELSE CAST(c.max_length / 2 AS VARCHAR(5))

									                                          END + ')'

									                                  WHEN y.name IN ('datetime2', 'time2', 'datetimeoffset')

									                                    THEN '(' + CAST(c.scale AS VARCHAR(5)) + ')'

									                                  WHEN y.name = 'decimal'

									                                    THEN '(' + CAST(c.[precision] AS VARCHAR(5)) + ',' + CAST(c.scale AS VARCHAR(5)) + ')'

									                                  ELSE ''

									                                END +

									                                CASE WHEN c.collation_name IS NOT NULL AND c.system_type_id = c.user_type_id

									                                  THEN ' COLLATE ' + c.collation_name

									                                  ELSE ''

									                                END +

									                                CASE WHEN c.is_nullable = 1

									                                  THEN ' NULL'

									                                  ELSE ' NOT NULL'

									                                END +

									                                CASE WHEN c.default_object_id != 0

									                                  THEN ' CONSTRAINT [' + OBJECT_NAME(c.default_object_id) + ']' +

									                                      ' DEFAULT ' + OBJECT_DEFINITION(c.default_object_id)

									                                  ELSE ''

									                                END

									                            END

									                          From sys.table_types tp

									                          Inner join sys.columns c on c.object_id = tp.type_table_object_id

									                          Inner join sys.types y ON y.system_type_id = c.system_type_id 

									                          WHERE tp.is_user_defined = 1 and y.name<>'sysname'

									                          and concat(QUOTENAME(schema_name(tp.schema_id)),'.',QUOTENAME(tp.name)) = '{0}'

									                          ORDER BY c.column_id

									                  FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 7, '   ')

									                    + ');'

									                  select @SQL as script

									                '''.format(self.format_object_name(self.format_object_name((tab_name))))

									    cursor_target = conn_target.cursor()

									    cursor_source.execute(sql_script)

									    row = cursor_source.fetchone()

									    try:

									      if not exists_in_target:

									        # execute the script on target server

									        cursor_target.execute(str(row[0])) # drop current stored_procudre if exists

									        conn_target.commit()

									        print("*************table type " + self.format_object_name(tab_name) + " synced *********************")

									        print() # give a blank row when finish

									    except:

									      print("----------------------- error message -----------------------")

									      print("-----------table type " + self.format_object_name(tab_name) + " synced error ---------------")

									      print("----------------------- error message -----------------------")

									      print()

									      # raise

									    cursor_source.close()

									    conn_source.close()

									    cursor_target.close()

									    conn_target.close()

									  # schema sync

									  def sync_schema(self):

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    arr_schema = []

									    # get all table in database when not define table name

									    schema_result = cursor_source.execute(r'''

									                         select name from sys.schemas where schema_id>4 and schema_id<16384

									                        ''')

									    for row in cursor_source.fetchall():

									      cursor_target.execute(r''' if not exists(select * from sys.schemas where name = '{0}')

									                         begin

									                           exec('create schema [{0}]')

									                         end

									                       '''.format(str(row[0])))

									      conn_target.commit()

									    cursor_source.close()

									    conn_source.close()

									    cursor_target.close()

									    conn_target.close()

									  def sync_table_schema_byname(self, tab_name, is_reference):

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    if (self.exits_object(conn_source, self.format_object_name(tab_name)) == 0):

									      print("----------------------- warning message -----------------------")

									      print("---------------warning: object " + tab_name + " not existing in source database ----------------")

									      print("----------------------- warning message -----------------------")

									      print()

									      return

									    # if exists a reference table for sp,not sync the table agagin

									    if (self.exits_object(conn_target, self.format_object_name(tab_name)) > 0):

									      if (self.f != "Y"):

									        print("----------------------- warning message -----------------------")

									        print("---------------warning: object " + tab_name + " existing in target database ----------------")

									        print("----------------------- warning message -----------------------")

									        print()

									        return

									    sql_script = r''' select top 1 1 from sys.tables 

									                   where type_desc = 'USER_TABLE' 

									                   and concat(QUOTENAME(schema_name(schema_id)),'.',QUOTENAME(name)) = '{0}' 

									                 '''.format((self.format_object_name(tab_name)))

									    # if the table schema exists in target server,skip

									    cursor_target.execute(sql_script)

									    exists_in_target = cursor_target.fetchone()

									    if exists_in_target:

									      if (self.f == "Y"):

									        if (is_reference != "Y"):

									          cursor_target.execute("drop table {0}".format(tab_name))

									      else:

									        print("----------------------- warning message -----------------------")

									        print("the target table " + tab_name + " exists ,skiped sync table schema from source")

									        print("----------------------- warning message -----------------------")

									        print()

									        return

									    sql_script = r'''   DECLARE 

									                   @object_name SYSNAME

									                  , @object_id INT

									                SELECT 

									                   @object_name = '[' + s.name + '].[' + o.name + ']'

									                  , @object_id = o.[object_id]

									                FROM sys.objects o WITH (NOWAIT)

									                JOIN sys.schemas s WITH (NOWAIT) ON o.[schema_id] = s.[schema_id]

									                WHERE QUOTENAME(s.name) + '.' + QUOTENAME(o.name) = '{0}'

									                  AND o.[type] = 'U'

									                  AND o.is_ms_shipped = 0

									                DECLARE @SQL NVARCHAR(MAX) = ''

									                ;WITH index_column AS 

									                (

									                  SELECT 

									                     ic.[object_id]

									                    , ic.index_id

									                    , ic.is_descending_key

									                    , ic.is_included_column

									                    , c.name

									                  FROM sys.index_columns ic WITH (NOWAIT)

									                  JOIN sys.columns c WITH (NOWAIT) ON ic.[object_id] = c.[object_id] AND ic.column_id = c.column_id

									                  WHERE ic.[object_id] = @object_id

									                ),

									                fk_columns AS 

									                (

									                   SELECT 

									                     k.constraint_object_id

									                    , cname = c.name

									                    , rcname = rc.name

									                  FROM sys.foreign_key_columns k WITH (NOWAIT)

									                  JOIN sys.columns rc WITH (NOWAIT) ON rc.[object_id] = k.referenced_object_id AND rc.column_id = k.referenced_column_id 

									                  JOIN sys.columns c WITH (NOWAIT) ON c.[object_id] = k.parent_object_id AND c.column_id = k.parent_column_id

									                  WHERE k.parent_object_id = @object_id

									                )

									                SELECT @SQL = 'CREATE TABLE ' + @object_name + '' + '(' + '' + STUFF((

									                  SELECT '' + ', [' + c.name + '] ' + 

									                    CASE WHEN c.is_computed = 1

									                      THEN 'AS ' + cc.[definition] 

									                      ELSE UPPER(tp.name) + 

									                        CASE WHEN tp.name IN ('varchar', 'char', 'varbinary', 'binary', 'text')

									                            THEN '(' + CASE WHEN c.max_length = -1 THEN 'MAX' ELSE CAST(c.max_length AS VARCHAR(5)) END + ')'

									                           WHEN tp.name IN ('nvarchar', 'nchar')

									                            THEN '(' + CASE WHEN c.max_length = -1 THEN 'MAX' ELSE CAST(c.max_length / 2 AS VARCHAR(5)) END + ')'

									                           WHEN tp.name IN ('datetime2', 'time2', 'datetimeoffset') 

									                            THEN '(' + CAST(c.scale AS VARCHAR(5)) + ')'

									                           WHEN tp.name = 'decimal' 

									                            THEN '(' + CAST(c.[precision] AS VARCHAR(5)) + ',' + CAST(c.scale AS VARCHAR(5)) + ')'

									                          ELSE ''

									                        END +

									                        CASE WHEN c.collation_name IS NOT NULL THEN ' COLLATE ' + c.collation_name ELSE '' END +

									                        CASE WHEN c.is_nullable = 1 THEN ' NULL' ELSE ' NOT NULL' END +

									                        CASE WHEN dc.[definition] IS NOT NULL THEN ' DEFAULT' + dc.[definition] ELSE '' END + 

									                        CASE WHEN ic.is_identity = 1 THEN ' IDENTITY(' + CAST(ISNULL( /*ic.seed_value*/ 1, '0') AS CHAR(1)) + ',' + CAST(ISNULL(ic.increment_value, '1') AS CHAR(1)) + ')' ELSE '' END 

									                    END + ''

									                  FROM sys.columns c WITH (NOWAIT)

									                  JOIN sys.types tp WITH (NOWAIT) ON c.user_type_id = tp.user_type_id

									                  LEFT JOIN sys.computed_columns cc WITH (NOWAIT) ON c.[object_id] = cc.[object_id] AND c.column_id = cc.column_id

									                  LEFT JOIN sys.default_constraints dc WITH (NOWAIT) ON c.default_object_id != 0 AND c.[object_id] = dc.parent_object_id AND c.column_id = dc.parent_column_id

									                  LEFT JOIN sys.identity_columns ic WITH (NOWAIT) ON c.is_identity = 1 AND c.[object_id] = ic.[object_id] AND c.column_id = ic.column_id

									                  WHERE c.[object_id] = @object_id

									                  ORDER BY c.column_id

									                  FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '' + ' ')

									                  + ISNULL((SELECT '' + ', CONSTRAINT [' + k.name + '] PRIMARY KEY (' + 

									                          (SELECT STUFF((

									                             SELECT ', [' + c.name + '] ' + CASE WHEN ic.is_descending_key = 1 THEN 'DESC' ELSE 'ASC' END

									                             FROM sys.index_columns ic WITH (NOWAIT)

									                             JOIN sys.columns c WITH (NOWAIT) ON c.[object_id] = ic.[object_id] AND c.column_id = ic.column_id

									                             WHERE ic.is_included_column = 0

									                               AND ic.[object_id] = k.parent_object_id 

									                               AND ic.index_id = k.unique_index_id   

									                             FOR XML PATH(N''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, ''))

									                      + ')' + ''

									                      FROM sys.key_constraints k WITH (NOWAIT)

									                      WHERE k.parent_object_id = @object_id 

									                        AND k.[type] = 'PK'), '') + ')' + ''

									                  + ISNULL((SELECT (

									                    SELECT '' +

									                       'ALTER TABLE ' + @object_name + ' WITH' 

									                      + CASE WHEN fk.is_not_trusted = 1 

									                        THEN ' NOCHECK' 

									                        ELSE ' CHECK' 

									                       END + 

									                       ' ADD CONSTRAINT [' + fk.name + '] FOREIGN KEY(' 

									                       + STUFF((

									                        SELECT ', [' + k.cname + ']'

									                        FROM fk_columns k

									                        WHERE k.constraint_object_id = fk.[object_id] and 1=2

									                        FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '')

									                        + ')' +

									                       ' REFERENCES [' + SCHEMA_NAME(ro.[schema_id]) + '].[' + ro.name + '] ('

									                       + STUFF((

									                        SELECT ', [' + k.rcname + ']'

									                        FROM fk_columns k

									                        WHERE k.constraint_object_id = fk.[object_id]

									                        FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '')

									                        + ')'

									                      + CASE 

									                        WHEN fk.delete_referential_action = 1 THEN ' ON DELETE CASCADE' 

									                        WHEN fk.delete_referential_action = 2 THEN ' ON DELETE SET NULL'

									                        WHEN fk.delete_referential_action = 3 THEN ' ON DELETE SET DEFAULT' 

									                        ELSE '' 

									                       END

									                      + CASE 

									                        WHEN fk.update_referential_action = 1 THEN ' ON UPDATE CASCADE'

									                        WHEN fk.update_referential_action = 2 THEN ' ON UPDATE SET NULL'

									                        WHEN fk.update_referential_action = 3 THEN ' ON UPDATE SET DEFAULT' 

									                        ELSE '' 

									                       END 

									                      + '' + 'ALTER TABLE ' + @object_name + ' CHECK CONSTRAINT [' + fk.name + ']' + ''

									                    FROM sys.foreign_keys fk WITH (NOWAIT)

									                    JOIN sys.objects ro WITH (NOWAIT) ON ro.[object_id] = fk.referenced_object_id

									                    WHERE fk.parent_object_id = @object_id

									                    FOR XML PATH(N''), TYPE).value('.', 'NVARCHAR(MAX)')), '')

									                  + ISNULL(((SELECT

									                     '' + 'CREATE' + CASE WHEN i.is_unique = 1 THEN ' UNIQUE' ELSE '' END 

									                        + ' NONCLUSTERED INDEX [' + i.name + '] ON ' + @object_name + ' (' +

									                        STUFF((

									                        SELECT ', [' + c.name + ']' + CASE WHEN c.is_descending_key = 1 THEN ' DESC' ELSE ' ASC' END

									                        FROM index_column c

									                        WHERE c.is_included_column = 0

									                          AND c.index_id = i.index_id

									                        FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '') + ')' 

									                        + ISNULL('' + 'INCLUDE (' + 

									                          STUFF((

									                          SELECT ', [' + c.name + ']'

									                          FROM index_column c

									                          WHERE c.is_included_column = 1

									                            AND c.index_id = i.index_id

									                          FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '') + ')', '') + ''

									                    FROM sys.indexes i WITH (NOWAIT)

									                    WHERE i.[object_id] = @object_id

									                      AND i.is_primary_key = 0

									                      AND i.[type] = 2

									                    FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)')

									                  ), '')

									                select @SQL as script '''.format(self.format_object_name(tab_name))

									    cursor_target = conn_target.cursor()

									    cursor_source.execute(sql_script)

									    row = cursor_source.fetchone()

									    if not row[0]:

									      return

									    try:

									      cursor_target.execute(row[0]) # drop current table schema if exists

									      conn_target.commit()

									      print("*************schema " + self.format_object_name(tab_name) + " synced *************")

									      print() # give a blank row when finish

									    except:

									      print("----------------------- warning message -----------------------")

									      print("-----------schema " + self.format_object_name(tab_name) + " synced failed---------------")

									      print("----------------------- warning message -----------------------")

									      print()

									    cursor_source.close()

									    conn_source.close()

									    cursor_target.close()

									    conn_target.close()

									  def get_table_column(self, conn, tab_name):

									    column_names = ""

									    conn = conn

									    cursor_source = conn.cursor()

									    # get object by name from source db

									    sql_script = r'''select name from sys.columns 

									             where object_id = object_id('{0}') and is_computed=0 order by object_id

									                 '''.format(self.format_object_name(tab_name))

									    cursor_source.execute(sql_script)

									    result = cursor_source.fetchall()

									    for row in result:

									      column_names = column_names + row[0] + ","

									    return column_names[0:len(column_names) - 1]

									    conn.cursor.close()

									    conn.close()

									  def sync_table_schema(self):

									    #default not sync by referenced other object

									    is_reference = "N"

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    arr_table = []

									    if (self.s_obj):

									      for tab_name in self.s_obj.split(","):

									        if (tab_name) and (self.exits_object(conn_source, tab_name)>0):

									          self.sync_table_schema_byname(tab_name, is_reference)

									        else:

									          print("----------------------- warning message -----------------------")

									          print("-----------schema " + self.format_object_name(tab_name) + " not existing in source database---------------")

									          print("----------------------- warning message -----------------------")

									          print()

									    else:

									      # sync all tables

									      # get all table in database when not define table name

									      sql_script = ''' SELECT QUOTENAME(s.name)+'.'+ QUOTENAME(o.name)

									               FROM sys.objects o WITH (NOWAIT)

									               JOIN sys.schemas s WITH (NOWAIT) ON o.[schema_id] = s.[schema_id]

									               WHERE o.[type] = 'U' AND o.is_ms_shipped = 0

									             '''

									      cursor_source.execute(sql_script)

									      for row in cursor_source.fetchall():

									        self.sync_table_schema_byname(str(row[0]), is_reference)

									  # sync data from soure table to target table

									  def sync_table_data(self):

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    arr_table = []

									    if (self.s_obj):

									      arr_table = self.s_obj.split(',')

									      for tab_name in arr_table:

									        if (self.exits_object(conn_target, self.format_object_name(tab_name)) == 0):

									          arr_table.remove(tab_name)

									          print("----------------- warning message -----------------------")

									          print("----------------- warning: table " + tab_name + " not existing in target database ---------------------")

									          print("----------------- warning message -----------------------")

									    else:

									      # get all table in database when not define table name

									      tab_result = cursor_source.execute(r''' SELECT QUOTENAME(s.name)+'.'+ QUOTENAME(o.name)

									                          FROM sys.objects o WITH (NOWAIT)

									                          JOIN sys.schemas s WITH (NOWAIT) ON o.[schema_id] = s.[schema_id]

									                          WHERE o.[type] = 'U'

									                            AND o.is_ms_shipped = 0

									                      ''')

									      for row in cursor_source.fetchall():

									        arr_table.append(str(row[0]))

									    insert_columns = ""

									    insert_columns = self.get_table_column(conn_source, tab_name)

									    for tab_name in arr_table:

									      if (self.f != "Y"):

									        sql_script = "select top 1 {0} from {1} ".format(insert_columns, tab_name)

									        # if exists data in target table,break

									        cursor_target.execute(sql_script)

									        exists = cursor_target.fetchone()

									        if exists:

									          print("----------------------- warning message -----------------------")

									          print("the target table " + tab_name + " exists data,skiped sync table type from source")

									          print("----------------------- warning message -----------------------")

									          print()

									          continue

									      else:

									        sql_script = "truncate table {0} ".format(tab_name)

									        # if exists data in target table,break

									        cursor_target.execute(sql_script)

									        conn_target.commit()

									      insert_columns = ""

									      insert_columns = self.get_table_column(conn_source, tab_name)

									      insert_prefix = ""

									      # weather has identity column

									      cursor_source.execute(r'''select 1 from sys.columns 

									                  where object_id = OBJECT_ID('{0}') and is_identity =1

									                  '''.format(tab_name))

									      exists_identity = None

									      exists_identity = cursor_source.fetchone()

									      if (exists_identity):

									        insert_prefix = "set identity_insert {0} on; ".format(tab_name)

									      # data source

									      insert_sql = ""

									      values_sql = ""

									      current_row = ""

									      counter = 0

									      sql_script = r''' select {0} from {1}  '''.format(insert_columns, tab_name)

									      cursor_source.execute(sql_script)

									      # create insert columns

									      '''

									      for field in cursor_source.description:

									        insert_columns = insert_columns + str(field[0]) + ","

									      insert_columns = insert_columns[0:len(insert_columns) - 1]

									      '''

									      insert_prefix = insert_prefix + "insert into {0} ({1}) values ".format(tab_name, insert_columns)

									      for row in cursor_source.fetchall():

									        counter = counter + 1

									        for key in row:

									          if (str(key) == "None"):

									            current_row = current_row + r''' null, '''

									          else:

									            if (type(key) is datetime.datetime):

									              current_row = current_row + r''' '{0}', '''.format(str(key)[0:23])

									            elif (type(key) is str):

									              # 我槽！！！，这里又有一个坑：https://blog.csdn.net/dadaowuque/article/details/81016127

									              current_row = current_row + r''' '{0}', '''.format(

									                key.replace("'", "''").replace('\u0000', '').replace('\x00', ''))

									            elif (type(key) is Decimal):

									              d = Decimal(key)

									              s = '{0:f}'.format(d)

									              current_row = current_row + r''' '{0}', '''.format(s)

									            elif (type(key) is bytes):

									              # print(hex(int.from_bytes(key, 'big', signed=True) ))

									              current_row = current_row + r''' {0}, '''.format(

									                hex(int.from_bytes(key, 'big', signed=False)))

									            else:

									              current_row = current_row + r''' '{0}', '''.format(key)

									        current_row = current_row[0:len(current_row) - 2] # remove the the last one char ","

									        values_sql = values_sql + "(" + current_row + "),"

									        current_row = ""

									        # execute the one batch when

									        if (counter == 1000):

									          insert_sql = insert_prefix + values_sql

									          insert_sql = insert_sql[0:len(insert_sql) - 1] # remove the the last one char ","

									          if (exists_identity):

									            insert_sql = insert_sql + " ;set identity_insert {0} off;".format(tab_name)

									          try:

									            cursor_target.execute(insert_sql)

									          except:

									            print(

									              "----------------------error " + tab_name + " data synced failed-------------------------")

									            raise

									          conn_target.commit()

									          insert_sql = ""

									          values_sql = ""

									          current_row = ""

									          counter = 0

									          print(time.strftime("%Y-%m-%d %H:%M:%S",

									                    time.localtime()) + "*************** " + self.format_object_name(

									            tab_name) + " " + str(1000) + " rows synced *************")

									      if (values_sql):

									        insert_sql = insert_prefix + values_sql

									        insert_sql = insert_sql[0:len(insert_sql) - 1] # remove the the last one char ","

									        if (exists_identity):

									          insert_sql = insert_sql + " ; set identity_insert {0} off;".format(tab_name)

									        # execute the last batch

									        try:

									          cursor_target.execute(insert_sql)

									        except:

									          print("------------------error " + tab_name + " data synced failed------------------------")

									          raise

									        conn_target.commit()

									        insert_sql = ""

									        values_sql = ""

									        current_row = ""

									        print(time.strftime("%Y-%m-%d %H:%M:%S",

									                  time.localtime()) + "*************** " + self.format_object_name(

									          tab_name) + " " + str(

									          counter) + " rows synced *************")

									        print(time.strftime("%Y-%m-%d %H:%M:%S",

									                  time.localtime()) + "----------------synced " + self.format_object_name(

									          tab_name) + " data finished---------------")

									        print()

									    cursor_source.close()

									    conn_source.close()

									    cursor_target.close()

									    conn_target.close()

									  def sync_dependent_object(self, obj_name):

									    # 强制覆盖，不需要对依赖对象生效，如果是因为属于依赖对象而被同步的，先检查target中是否存在，如果存在就不继续同步，这里打一个标记来实现

									    is_refernece = "Y"

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    '''

									    find dependent objects

									    if exists dependent objects,sync Dependent objects objects in advance

									    '''

									    sql_check_dependent = r'''       

									               SELECT * FROM

									              (

									                SELECT

									                distinct rtrim(lower(s.type)) COLLATE Chinese_PRC_CI_AS as obj_type, 

									                QUOTENAME(d.referenced_schema_name)+'.'+QUOTENAME(d.referenced_entity_name) COLLATE Chinese_PRC_CI_AS as obj

									                FROM sys.dm_sql_referenced_entities('{0}','OBJECT') as d

									                  inner join sys.sysobjects s on s.id = d.referenced_id

									                union all

									                SELECT

									                distinct rtrim(lower(d.referenced_class_desc)) COLLATE Chinese_PRC_CI_AS as obj_type,

									                QUOTENAME(d.referenced_schema_name)+'.'+QUOTENAME(d.referenced_entity_name) COLLATE Chinese_PRC_CI_AS as obj

									                FROM sys.dm_sql_referenced_entities('{0}','OBJECT') as d

									                  inner join sys.types s on s.user_type_id = d.referenced_id

									              )t

									               '''.format(self.format_object_name(obj_name))

									    cursor_source.execute(sql_check_dependent)

									    result = cursor_source.fetchall()

									    for row in result:

									      if row[1]:

									        if (row[0] == "u"):

									          if (row[1]):

									            self.sync_table_schema_byname(row[1], is_refernece)

									        elif (row[0] == "fn" or row[0] == "if"):

									          if (row[1]):

									            self.sync_procudre_by_name("f", row[1], is_refernece)

									        elif (row[0] == "type"):

									          if (row[1]):

									            self.sync_table_variable(row[1], is_refernece)

									  def sync_procudre_by_name(self, type, obj_name, is_reference):

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    if (self.exits_object(conn_source, self.format_object_name(obj_name)) == 0):

									      print("---------------warning message----------------")

									      print("---------------warning: object " + obj_name + " not existing in source database ----------------")

									      print("---------------warning message----------------")

									      print()

									      return

									    if (self.exits_object(conn_target, self.format_object_name(obj_name)) > 0):

									      if (self.f != "Y"):

									        print("---------------warning message----------------")

									        print("---------------warning: object " + obj_name + " existing in target database ----------------")

									        print("---------------warning message----------------")

									        print()

									        return

									    ''' 

									    本来想直接生成删除语句的：  

									    这里有一个该死的转义，怎么都弄不好，中午先去吃饭吧，

									    下午回来想了一下，换一种方式，不要死磕转义问题了

									    sql_script = 

									          select

									          'if object_id('+''''+QUOTENAME(schema_name(uid))+ '' + QUOTENAME(name)+''''+') is not null '

									          +' drop proc '+QUOTENAME(schema_name(uid))+ '.' + QUOTENAME(name) ,

									          OBJECT_DEFINITION(id)

									          from sys.sysobjects where xtype = 'P' and uid not in (16,19)

									    '''

									    sql_script = r'''

									          select

									          QUOTENAME(schema_name(uid))+'.'+QUOTENAME(name),

									          OBJECT_DEFINITION(id)

									          from sys.sysobjects where xtype in ('P','IF','FN') and uid not in (16,19)

									         '''

									    if (obj_name):

									      sql_script = sql_script + " and QUOTENAME(schema_name(uid))+ '.' + QUOTENAME(name) ='{0}' ".format(

									        self.format_object_name(obj_name))

									    cursor_source.execute(sql_script)

									    row = cursor_source.fetchone()

									    try:

									      if type == "f":

									        sql_script = r'''

									                if object_id('{0}') is not null 

									                  drop function {0}

									              '''.format(self.format_object_name(row[0]))

									      elif type == "p":

									        sql_script = r'''

									                if object_id('{0}') is not null 

									                  drop proc {0}

									              '''.format(self.format_object_name(row[0]))

									      cursor_target.execute(sql_script) # drop current stored_procudre if exists

									      conn_target.commit()

									      # sync dependent object

									      if (is_reference != "N"):

									        self.sync_dependent_object(self.format_object_name(row[0]))

									      # sync object it self

									      cursor_target.execute(str(row[1])) # execute create stored_procudre script

									      conn_target.commit()

									      print("*************sync sp: " + self.format_object_name(row[0]) + " finished *****************")

									      print()

									    except:

									      print("---------------error message----------------")

									      print("------------------ sync " + row[0] + "sp error --------------------------")

									      print("---------------error message----------------")

									      print()

									    cursor_source.close()

									    conn_source.close()

									    cursor_target.close()

									    conn_target.close()

									  def sync_procudre(self, type):

									    is_reference = "N"

									    conn_source = self.get_connect(self.s_h, self.s_i, self.s_P, self.s_u, self.s_p, self.s_d)

									    conn_target = self.get_connect(self.t_h, self.t_i, self.t_P, self.t_u, self.t_p, self.t_d)

									    cursor_source = conn_source.cursor()

									    cursor_target = conn_target.cursor()

									    if (self.s_obj):

									      for proc_name in self.s_obj.split(","):

									        self.sync_dependent_object(proc_name)

									        self.sync_procudre_by_name(type, proc_name, is_reference)

									    # sync all sp and function

									    else:

									      sql_script = r'''

									            select

									            QUOTENAME(schema_name(uid))+'.'+QUOTENAME(name),

									            OBJECT_DEFINITION(id)

									            from sys.sysobjects where xtype = upper('{0}') and uid not in (16,19)

									           '''.format(type)

									      cursor_source.execute(sql_script)

									      for row in cursor_source.fetchall():

									        self.sync_dependent_object(row[0])

									        self.sync_procudre_by_name(type, row[0], is_reference)

									if __name__ == "__main__":

									  '''

									  sync = SyncDatabaseObject(s_h="127.0.0.1",

									               s_i = "sql2017",

									               s_P = 49744,

									               s_d="DB01",

									               t_h="127.0.0.1",

									               t_i="sql2017",

									               t_P=49744,

									               t_d="DB02",

									               s_obj_type = "sp",

									               s_obj = "dbo.sp_test01",

									               f="Y")

									  sync.sync_procudre("p")

									  '''

									  p_s_h = ""

									  p_s_i = "MSSQL"

									  p_s_P = 1433

									  p_s_d = ""

									  p_s_u = None

									  p_s_p = None

									  p_s_obj = ""

									  p_type = ""

									  p_t_s = ""

									  p_t_i = "MSSQL"

									  p_t_P = "1433"

									  p_t_d = ""

									  p_t_u = None

									  p_t_p = None

									  # force conver target database object,default not force cover target database object

									  p_f = "N"

									  # sync obj type table|sp

									  p_obj_type = None

									  # sync whick database object

									  p_obj = None

									  if len(sys.argv) == 1:

									    print(usage)

									    sys.exit(1)

									  elif sys.argv[1] == '--help':

									    print(usage)

									    sys.exit()

									  elif len(sys.argv) >= 2:

									    for i in sys.argv[1:]:

									      _argv = i.split('=')

									      # source server name

									      if _argv[0] == '-s_h':

									        p_s_h = _argv[1]

									      # source server instance name

									      if _argv[0] == '-s_i':

									        if (_argv[1]):

									          p_s_i = _argv[1]

									      # source server instance PORT

									      if _argv[0] == '-s_P':

									        if (_argv[1]):

									          p_s_P = _argv[1]

									      # source database name

									      if _argv[0] == '-s_d':

									        p_s_d = _argv[1]

									      if _argv[0] == '-s_u':

									        p_s_u = _argv[1]

									      if _argv[0] == '-s_p':

									        p_s_p = _argv[1]

									      if _argv[0] == '-t_h':

									        p_t_h = _argv[1]

									      if _argv[0] == '-t_i':

									        if (_argv[1]):

									          p_t_i = _argv[1]

									      if _argv[0] == '-t_P':

									        if (_argv[1]):

									          p_t_P = _argv[1]

									      if _argv[0] == '-t_d':

									        p_t_d = _argv[1]

									      if _argv[0] == '-t_u':

									        p_t_u = _argv[1]

									      if _argv[0] == '-t_p':

									        p_t_p = _argv[1]

									      if _argv[0] == '-f':

									        if (_argv[1]):

									          p_f = _argv[1]

									      # object type

									      if _argv[0] == '-obj_type':

									        if not (_argv[1]):

									          print("-obj_type can not be null （-obj=tab|-obj=sp|-obj=fn|-obj=type）")

									          exit(0)

									        else:

									          p_obj_type = _argv[1]

									      # object name

									      if _argv[0] == '-obj':

									        if (_argv[1]):

									          p_obj = _argv[1]

									    # require para

									    if p_s_h.strip() == "":

									      print("source server host cannot be null")

									      exit(0)

									    if p_s_d.strip() == "":

									      print("source server host database name cannot be null")

									      exit(0)

									    if p_t_h.strip() == "":

									      print("target server host cannot be null")

									      exit(0)

									    if p_t_d.strip() == "":

									      print("target server host database name cannot be null")

									      exit(0)

									    sync = SyncDatabaseObject(s_h=p_s_h,

									                 s_i=p_s_i,

									                 s_P=p_s_P,

									                 s_d=p_s_d,

									                 s_u=p_s_u,

									                 s_p=p_s_p,

									                 s_obj=p_obj,

									                 t_h=p_t_h,

									                 t_i=p_t_i,

									                 t_P=p_t_P,

									                 t_d=p_t_d,

									                 t_u=p_t_u,

									                 t_p=p_t_p,

									                 f=p_f)

									    sync.validated_connect(p_s_h, p_s_i, p_s_P, p_s_d, p_s_u, p_s_p)

									    sync.validated_connect(p_t_h, p_t_i, p_t_P, p_t_d, p_t_u, p_t_p)

									    if (p_f.upper() == "Y"):

									      confirm = input("confirm you want to overwrite the target object? ")

									      if confirm.upper() != "Y":

									        exit(0)

									    print("-------------------------- sync begin ----------------------------------")

									    print()

									    if (p_obj_type == "tab"):

									      # sync schema

									      sync.sync_schema()

									      # sync table schema

									      sync.sync_table_schema()

									      # sync data

									      sync.sync_table_data()

									    elif (p_obj_type == "sp"):

									      # sync schema

									      sync.sync_schema()

									      # sync sp

									      sync.sync_procudre("p")

									    elif (p_obj_type == "fn"):

									      # sync schema

									      sync.sync_schema()

									      # sync sp

									      sync.sync_procudre("fn")

									    elif (p_obj_type == "tp"):

									      # sync schema

									      sync.sync_schema()

									      # sync sp

									      sync.sync_table_variable()

									    else:

									      print("-obj_type is not validated")

									    print()

									    print("-------------------------- sync finish ----------------------------------")