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Multiple queries executed in java in single statement
... it is possible to execute something like this using JDBC.
"SELECT FROM * TABLE;INSERT INTO TABLE;"
Yes it is possible. There are two ways, as far as I know. They are
By setting database connection property to allow multiple queries,
separated by a semi-colon by default.
By calling a stored pro...
What is a columnar database?
...are build upon traditional, row-oriented, DBMS, simply storing the info in tables with one (or rather often two) columns (and adding the necessary layer to access the columnar data in an easy fashion).
How do they differ from relational databases?
They generally differ from traditional (row-oriente...
SQL Server 2012 column identity increment jumping from 6 to 1000+ on 7th entry [duplicate]
...ork for hosted Sql Server Express installations. So, I created an identity table, and use this through an INSTEAD OF trigger. I'm hoping this helps someone else, and/or gives others an opportunity to improve my solution. The last line allows returning the last identity column added. Since I typicall...
How to list active / open connections in Oracle?
Is there any hidden table, system variable or something to show active connections in a given moment?
9 Answers
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Default height for section header in UITableView
I want to set the height of the first header in my UITableView. For the other headers I want them to remain the default height. What value/constant can I put in place of "someDefaultHeight" in the code below?
...
Why does NULL = NULL evaluate to false in SQL server
...
@NeilMcGuigan That's true if for data that has its own table, but what about data that's represented in a column? Wouldn't you use 'null' to represent the fact that the data doesn't exist? 'Not known' is a very specific reason for the data being absent.
– Ri...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
...--master-data=1 > data.sql
注：master-data选项缺省会打开lock-all-tables，并写入CHANGE MASTER TO语句。
如果数据库使用的是InnoDB表类型的话，则应该使用single-transcation：
shell> mysqldump --all-databases --single-transaction --master-data=1 > data.sql
有了...
How to 'bulk update' with Django?
I'd like to update a table with Django - something like this in raw SQL:
5 Answers
5
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How to set default values in Rails?
... If you know you'll always want that default value for that column on that table, setting them in a DB migration file is the easiest way:
class SetDefault < ActiveRecord::Migration
def self.up
change_column :people, :last_name, :type, :default => "Doe"
end
def self.down
# You c...
Using a custom image for a UITableViewCell's accessoryView and having it respond to UITableViewDeleg
I'm using a custom drawn UITableViewCell, including the same for the cell's accessoryView . My setup for the accessoryView happens by the way of something like this:
...