在命令列中實現資料遷移， 工程放在f:/erp1/server中
開始準備工作：使用命令安裝flask-migrate包
pip install flask-migrate
第一步：進入工程目錄
c:\users\administrator>f:
f:\>cd f:\erp1\server
f:\erp1\server>
f:\erp1\server>dir
f:\erp1\server 的目錄
2016/06/28 10:26 .
2016/06/28 10:26 ..
2016/06/29 16:26 .idea
2016/06/27 16:59 config
2016/06/29 16:17 control_center
2016/06/27 16:05 data_mode
2016/06/27 16:06 event_bus
2016/06/27 16:05 3,836 manage.py
2016/06/27 16:59 public
2016/06/27 16:59 46 run.bat
2016/06/27 16:59 user_center
2016/06/27 16:06 0 __init__.py
3 個檔案 3,882 位元組
9 個目錄 233,661,837,312 可用位元組
第二步：建立遷移倉庫，執行完該步驟之後，將在工程目錄下產生乙個名為migrations資料夾，所有遷移指令碼放在這裡面
f:\erp1\server>python manage.py db init
creating directory f:\erp1\server\migrations ... done
creating directory f:\erp1\server\migrations\versions ... done
generating f:\erp1\server\migrations\alembic.ini ... done
generating f:\erp1\server\migrations\env.py ... done
generating f:\erp1\server\migrations\env.pyc ... done
generating f:\erp1\server\migrations\readme ... done
generating f:\erp1\server\migrations\script.py.mako ... done
please edit configuration/connection/logging settings in 'f:\\erp1\\server\\migr
ations\\alembic.ini' before proceeding.
f:\erp1\server>python manage.py db
usage: perform database migrations
perform database migrations
positional arguments:
upgrade upgrade to a later version
migrate alias for 'revision --autogenerate'
current display the current revision for each database.
stamp 'stamp' the revision table with the given revision;
don't run any migrations
init generates a new migration
downgrade revert to a previous version
history list changeset scripts in chronological order.
revision create a new revision file.
optional arguments:
-?, --help show this help message and exit
第三步：建立遷移指令碼
f:\erp1\server>python manage.py db migrate
info [alembic.runtime.migration] context impl mysqlimpl.
info [alembic.runtime.migration] will assume non-transactional ddl.
info [alembic.autogenerate.compare] detected added table 'admin_group'
info [alembic.autogenerate.compare] detected added table 'admin_url'
info [alembic.autogenerate.compare] detected added table 'organ_company'
info [alembic.autogenerate.compare] detected added table 'admin_group_url'
info [alembic.autogenerate.compare] detected added table 'admin_url_data'
info [alembic.autogenerate.compare] detected added table 'organ_department'
info [alembic.autogenerate.compare] detected added table 'admin_group_url_data_
curd'
info [alembic.autogenerate.compare] detected added table 'organ_position'
info [alembic.autogenerate.compare] detected added table 'admin_users'
info [alembic.autogenerate.compare] detected added index 'ix_admin_users_email'
on '['email']'
info [alembic.autogenerate.compare] detected added index 'ix_admin_users_teleph
one' on '['telephone']'
info [alembic.autogenerate.compare] detected added index 'ix_admin_users_userna
me' on '['username']'
info [alembic.autogenerate.compare] detected added index 'ix_admin_users_work_n
umber' on '['work_number']'
info [alembic.autogenerate.compare] detected added table 'admin_user_group'
info [alembic.autogenerate.compare] detected added table 'admin_user_parttime_p
osition'
generating f:\erp1\server\migrations\versions\ab42fba096ab_.py ... done
第四步：更新資料庫
f:\erp1\server>python manage.py db upgrade
info [alembic.runtime.migration] context impl mysqlimpl.
info [alembic.runtime.migration] will assume non-transactional ddl.
info [alembic.runtime.migration] running upgrade -> ab42fba096ab, empty messag
ef:\erp1\server>python manage.py
usage: manage.py [-?]
...positional arguments:
show_urls displays all of the url matching routes for the
project
deploy run deployment tasks.
db perform database migrations
init_url
clean remove *.pyc and *.pyo files recursively starting at
current directory
get_table
optional arguments:
-?, --help show this help message and exit
第五步：初始化路由，這個步驟只是針對此專案而言。其他的專案不需要這個步驟的。
f:\erp1\server>python manage.py init_url
****************************************
f:\erp1\server>
Flask Migrate資料庫遷移
資料庫遷移命令列操作 為什麼使用flask migrate 在我們用 sqlchemy 模組建立完幾個表時，如果在實際生產環境中，需要對錶結構進行更改，應該怎麼辦呢？總不能把錶刪除了吧，這樣資料就會丟失了。更好的解決辦法是使用資料庫遷移框架，它可以追蹤資料庫模式的變化，然後把變動應用到資料庫中。在f...
使用Flask Migrate進行管理資料庫公升級
我們在公升級系統的時候，經常碰到需要更新伺服器端資料結構等操作，之前的方式是通過手工編寫alter sql指令碼處理，經常會發現遺漏，導致程式發布到伺服器上後無法正常使用。現在我們可以使用flask migrate外掛程式來解決之，flask migrate外掛程式是基於alembic，alembi...
資料庫 資料庫索引
索引是儲存引擎用於快速找到記錄的一種資料結構。索引以檔案的形式儲存在磁碟中。索引可以包含乙個或多個列的值。儲存引擎查詢資料的時候，先在索引中找對應值，然後根據匹配的索引記錄找到對應的資料行。1.b tree索引 2.雜湊索引 myisam和innodb儲存引擎 只支援btree索引，也就是說預設使用...