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How do I quickly rename a MySQL database (change schema name)?
...u username -ppassword -sNe "rename table old_db.$table to new_db.$table"; done
OR
for table in `mysql -u root -ppassword -s -N -e "use old_db;show tables from old_db;"`; do mysql -u root -ppassword -s -N -e "use old_db;rename table old_db.$table to new_db.$table;"; done;
Notes:
There is no ...
mongodb: insert if not exists
...le:
now = datetime.utcnow()
for document in update:
collection.update_one(
{"_id": document["_id"]},
{
"$setOnInsert": {"insertion_date": now},
"$set": {"last_update_date": now},
},
upsert=True,
)
...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...p Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it has limited features. We enabled App Inventor with multi-t...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...p Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it has limited features. We enabled App Inventor with multi-t...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...p Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it has limited features. We enabled App Inventor with multi-t...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...p Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it has limited features. We enabled App Inventor with multi-t...
What did MongoDB not being ACID compliant before v4 really mean?
...
One thing you lose with MongoDB is multi-collection (table) transactions. Atomic modifiers in MongoDB can only work against a single document.
If you need to remove an item from inventory and add it to someone's order at th...
A dependent property in a ReferentialConstraint is mapped to a store-generated column
...u defined a bad column relation between your tables? different columns and one was set as autonumeric.
It happened to me.
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How do I rename an open file in Emacs?
...e in Emacs? While I'm viewing it? Something like save-as, but the original one should go away.
10 Answers
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How to add an extra source directory for maven to compile and include in the build jar?
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Does eclipse really recognize such a folder as one of the buildpaths for anyone? 'cos it doesn't for me. FWIW, I use m2e to import the project.
– mystarrocks
Oct 30 '14 at 13:21
...