Create two tables balance (balance table) and customer (customer table) in MySQL database and insert data.
create table customer(
id int(10) primary key,
name char(20) not null,
role char(20) not null,
phone char(20) not null,
sex char(10) not null,
address char(50) not null
)ENGINE=InnoDB DEFAULT CHARSET ...
Posted by shaunrigby on Thu, 09 May 2019 05:42:03 +0200
Original text: https://blog.csdn.net/h1025372645/article/details/89191301
Java DataBase Connectivity,java database connection, in order to reduce the difficulty of operating data, java provides jdbc, according to the characteristics of java object-oriented, many operations are encapsulated.
Posted by arctushar on Wed, 08 May 2019 21:57:03 +0200
Why do we build this? It is very expensive to store a large amount of data on the block chain of Taifang. According to the Yellow Paper of ETF, it is about 20,000 gas, 256 bit/8 bytes (1 word). Based on 02/28/2018 gas price is 4 gwei/gas. Please refer to: https://ethgasstation.info Know the current price.
Each transaction has 8 bytes of 20,000 ...
Posted by thepreacher on Wed, 08 May 2019 18:00:02 +0200
At ORACLE10g and 11g versions, the default log archive path for ORACLE is the flash-back recovery area ($ORACLE_BASE/flash_recovery_area).ORACLE has a limitation on this path: it only has 2G of space by default, and it is not only the default path for archive logs, but also the default address for backup files and flash back lo ...
Posted by maheshb on Wed, 08 May 2019 04:35:03 +0200
NEO400J Level Full-Text Index Construction Optimization
1. Scale of data volume (level 100 million)
2. Ways to Build Indexes
3. Exceptions Occurring in Index Building
IV. Code optimization for full-text index
2. When accessing a database
3. Optimizing scheme
4. Optimize Code
5. Perform efficiency ...
Posted by lisa007 on Tue, 07 May 2019 12:10:06 +0200
A orm database Flutter plugin.
I posted an article earlier. Hand-in-Hand Teaching You Elegant Use of ORM Database in Flutter Project Many people also put forward some valuable suggestions on consulting and using, saying that they do not want to write lua, which is not elegant enough, but also increases the cost of learning. On reflection, it is ...
Posted by hijack on Tue, 07 May 2019 05:00:05 +0200
Redis Learning Cluster
In the first place, we learned the basic operation of Redis, the use of Jedis and the persistence scheme of Redis. Next, we learned the cluster management of Redis.
When data is stored on a server, if the server hangs up, the data will be lost, so Redis provides the function of replicati ...
We always use redis of Aliyun. We are not a high concurrent application. We mainly use redis as distributed locks and a small amount of caches. It hardly needs maintenance. Yesterday afternoon, we suddenly received an alarm email. On-line redis memory is used 100% and instantaneous nerve tension sensation is confirmed by console.This is a ...
Posted by jim_de_bo on Mon, 06 May 2019 15:00:04 +0200
PostgreSQL , Heap Only Tuple , HOT
PostgreSQL's current default storage engine generates a new version in the heap when updating records. The old version needs to recycle all index POINT associated with this version before it needs to recycle the old version after VACUUM is used.
The KEY of the index of PG is the value of th ...
Posted by Goins on Mon, 06 May 2019 12:45:03 +0200