Standard Origin: http://www.cnblogs.com/wy123/p/6426261.html
Just as ADO.NET connects to data to perform add/delete check and change operations, PowerShell can also connect to the SQL Server database and perform add/delete check and change functions. In addition, PowerShell can also perform DDL and DCL operations. In addition, it supports ...
Posted on Fri, 21 Dec 2018 19:09:06 -0800 by eludlow
PostgreSQL, Virtual Index, False Index, HypoPG, hypothetical Index
DBA is actually a scarce resource. Many enterprises do not even have DBA, or SA, developers work part-time DBA. For general users, they have limited knowledge of database, especially in SQL optimization.
The most commonly used and fast-acting means of SQL opt ...
Posted on Fri, 21 Dec 2018 18:33:05 -0800 by mator
Understanding Abstract factories
In ADO.NET, the operation steps of SqlServer, Mysql and so on are similar, but the difference is:
SqlServer uses SqlConnection, SqlCommand, SqlData Adapter for its operation.
MySql uses MySql Connection, MySqlCommand, MySqlDataAdapter, and these connection classes of operation classes ...
Posted on Thu, 20 Dec 2018 17:12:05 -0800 by j05hr
Query Task of ArcGIS API for Js
Implementing Functional Description
Understand the relationship between Query and Query Task
Implementing Relevant Queries for Publishing Layer Attribute Information
Relevant Visual Display Based on 3D Symbol and Information Template Pop-up
Relevant mechanisms of dojo/_base/array
Code for implementation
Posted on Thu, 20 Dec 2018 12:36:05 -0800 by robertaccettura
In the where condition of sql statement, some security judgments are needed, such as searching by sex. If the incoming parameters are empty, then the query results are likely to be empty. Perhaps we need the parameters to be empty, which is to find all the information. This is how we can use dynamic sql to add a judgment, when the parameters ...
Posted on Thu, 20 Dec 2018 06:15:06 -0800 by hyp0r
In the morning, my buddies came to ask for help and said that an ETL database could not be started. There was an ORA-00600 error. Several internal errors of ORA-00600 have been encountered before, which are caused by abnormal power failure of database server. These errors are usually caused by internal bug s of oracle i ...
Posted on Wed, 19 Dec 2018 18:00:05 -0800 by sp2hari
PostgreSQL, HTAP, OLTP, OLAP, Scenario and Performance Testing
PostgreSQL is a database with a long history, which can be traced back to 1973. It was first awarded by the 2014 Computer Turing Prize winner and the originator of relational database. Michael_Stonebraker PostgreSQL has similar functions, performance, architectur ...
Posted on Wed, 19 Dec 2018 05:03:04 -0800 by bdeonline
LAST_INSERT_ID() is a function in MySQL that automatically returns the value from the first table set by the AUTO_INCREMENT column in the last INSERT or UPDATE query.
Matters needing attention
The Connection object used for query and insertion must be the same, otherwise the return value is unpredictable.
Posted on Wed, 19 Dec 2018 03:15:04 -0800 by dmort
I. JPA General Policy Generator
Hibernate entities are mapped by annotation. The annotation-based hibernate primary key is identified as @Id.
Its generation rules are set by @GeneratedValue. Here @id and @GeneratedValue are standard uses of JPA.
JPA provides four standard uses, as can be seen from the source code of @GeneratedValue.
Posted on Tue, 18 Dec 2018 13:54:04 -0800 by thinguy
In Db2 routine operation and maintenance, it is sometimes found that ALTER TABLE operation fails due to lock timeout. If you look at the lock situation before the lock timeout, you may see that it needs X-type internal plan lock. Other applications have held the lock in S mode. The incompatibility of the two results in ALTER TABLE lock and so o ...
Posted on Tue, 18 Dec 2018 10:39:04 -0800 by Magena Cadmar