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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
Some SQL servers have a feature where INSERT is skipped if it would violate a primary/unique key constraint. For instance, MySQL has INSERT IGNORE .
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How to call a stored procedure from Java and JPA
...text is this:
JPA and database stored procedures
If you’re a big fan of SQL, you may be
willing to exploit the power of
database stored procedures.
Unfortunately, JPA doesn’t support
stored procedures, and you have to
depend on a proprietary feature of
your persistence provider. However,
you ca...
A dependent property in a ReferentialConstraint is mapped to a store-generated column
... had left the foreign key part of the relationship as the default given by SQL Server 2008 Management Studio, which was the primary key fields of the child table, not the column I had created to contain the foreign key value.
– robaker
Mar 5 '12 at 10:23
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Get first day of week in SQL Server
...-- Magic convertion of monday to 1, tuesday to 2, etc.
-- irrespect what SQL server thinks about start of the week.
-- But here we have sunday marked as 0, but we fix this later.
SET @DOW = (@DOW + @@DATEFIRST - 1) %7
IF @DOW = 0 SET @DOW = 7 -- fix for sunday
RETURN DATEADD(DD, 1 - @DOW,...
Using an RDBMS as event sourcing storage
If I were using an RDBMS (e.g. SQL Server) to store event sourcing data, what might the schema look like?
6 Answers
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程序员之网络安全系列（五）：数字证书以及12306的证书问题 - 更多技术 - ...
...natures), so your connection may not be private.），我猜他们是为了性能？？
但是，就算浏览器地址栏的锁不能变绿，我们还得订票不是吗？
我觉得12306可能需要一个操作系统内置的认证机构来发一个证书，不然普通的用户根本不知道怎...
PDO's query vs execute
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query runs a standard SQL statement and requires you to properly escape all data to avoid SQL Injections and other issues.
execute runs a prepared statement which allows you to bind parameters to avoid the need to escape or quote the parameters. ...
How do I execute a stored procedure once for each row returned by query?
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use a cursor
ADDENDUM: [MS SQL cursor example]
declare @field1 int
declare @field2 int
declare cur CURSOR LOCAL for
select field1, field2 from sometable where someotherfield is null
open cur
fetch next from cur into @field1, @field2
while @@FET...
What is the string concatenation operator in Oracle?
What is the string concatenation operator in Oracle SQL?
5 Answers
5
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Backup/Restore a dockerized PostgreSQL database
I'm trying to backup/restore a PostgreSQL database as is explained on the Docker website, but the data is not restored.
10 ...