Programmer Group

I love mybatis because of the freedom of sql mapping, sql in the hand, everything I have that feeling!However, due to its incomplete ORM framework, we gain the freedom of SQL and lose the natural feature of ORM-compatible multilibraries.This article tells you how to make mybatis lightweight support database compatibility? Beacuse of some reason ...

Recently, when using the system, users generally feedback a question: When switching responsibilities, it's very slow. It takes about 5 seconds. Sometimes it takes more than seven seconds. In the following figure, it often takes about 5 seconds to switch to another duty after the point is determined. How to deal with this problem? In fact ...

1. Batch Data Operation 1.1. Batch Generation Data 1.2. Batch insertion data 2. Batch generation script 3. Generating Data Dictionary 4. Common System Packages 4.1,DBMS_OUTPUT 4.2,DBMS_RANDOM 4.3. Other System Packages and Common Methods 5. Summary 1. Batch Data Operation 1.1. Batch Generation Data Generate integers between 1 and 5 SE ...

The development of students in recent days reflects a problem, there is a Java night program, used to delete historical expired data regularly every day, before March 10, after internal testing, but these two days again, there is a SQL statement has been reported ORA-01752 error, due to a recent development library migration, from one computer ...

Advantages of MySql replication: 1. If there is a problem with the primary server, you can quickly switch to the services provided by the slave server. 2. Query operations can be performed from the slave server to reduce the access pressure of the primary server. 3. Backup can be performed from the server to avoid affecting the service of t ...

Recently, I changed my computer system to centos. Everyday development tools need to be reconfigured. Here I record the configuration of mysql, which is different from the ubuntu series. Reference resources: http://www.centoscn.com/mysql/2016/0315/6844.html 1. MySQL relies on libaio, so first install libaio yum search libaio # Retrieval ...

Changes of CRSD Process in 11gIn 11.2, the CRSD process is no longer one of the most critical processes in RAC.If you are familiar with 10g RAC, you should be aware of the importance of the CRSD process. After the operating system is started, Oracle starts the whole CLUSTER and database by starting the process.In RAC 11.2, Oracle adjusted the A ...

This is the third and final article of Android Binder mechanism analysis. This article explains the logic of the Java part of the Binder Framework. For the first two articles on Binder mechanism analysis, please step here: Understanding Android Binder Mechanism (1/3): Driver Chapter Understanding Android Binder Mechanism (2/3): C++ L ...

        Hydra Hydra's Violent Password Cracking Tool is quite powerful, supporting online password cracking for almost all protocols. Whether the password can be cracked or not depends on whether the dictionary is strong enough for social engineering penetration to sometimes achieve twice the result with half the effort.This article onl ...

The following applies to oracle 10.2.0.5 and above One query is slow, and the original SQL is as follows: 1 select 2 a.* 3 from (select 4 ssi.ID, 5 'small_station_info' TB, 6 (select sbi.name 7 from scene_base_info sbi 8 where sbi.id = ssi.antenna_selection) as antenna_selec ...