We are using Hibernate and the c3p0 connection pool library. So far, this combination works well, until recently we decided to increase maxPoolSize to 1000 and perform a lot of stress testing on ou
Author: Simo
Hive and HBase difference
Hive
Data warehouse, the essence of Hive is actually equivalent to making a bijective relationship in Mysql for files already stored in HDFS to facilitate the use of HQL to manage queries< /s
Hibernate – Connect multiple tables in HQL
Can anyone help me convert this query to HQL
SELECT
supplierOrderDetails.productID,< br /> supplierOrderDetails.orderQty,
supplierOrderReceiveDetail.qtyArrived
FROM
supplierOrder
INNER JO
What is the difference between Observer.Throw and Observer.Error in TypeScript – Observable?
What is the difference between observer.throw (error) and observer.error (error)?
I am using RxJS version “5.0.0-beta.12”
var innerObservable = new Observable(observer => {
console.log
Hibernate manually set id invalid reason and solution
In the process of using Hibernate, it is found that the manually set id (primary key) is invalid. Hibernate will still automatically generate a random id when saving (calling the merge() method pro
Hadoop – write Spark data frame as inlaid to S3 instead of creating _temporary folder
Using pyspark I am reading a data frame from a parquet file on Amazon S3
dataS3 = sql. read.parquet(“s3a://” + s3_bucket_in) This is no problem. But then I try to write data
dataS3.writ
Hibernate&MyBatis different
I. Introduction to the framework
Hibernate is an excellent ORM framework (object relationship implicit), which highly encapsulates the relationship between SQL statements and tables. Develope
Hadoop – How do I get all table definitions in the database in Hive?
I want to get all table definitions in Hive. I know that I can use something similar for single table definitions –
describe <>
describe extended <> However, I can’t find a way to get all ta
Hibernate – Envers: Unidirectional OneTomany does not have additional audit tables?
The following database structure:
Employee [EMP_ID(PK), name, salary]
Phone [ID(PK), number_str,OWNER_ID(FK)]
Employee_aud [EMP_ID(PK),REV(PK / FK),REVTYPE,name,salary]
Phon
NHIBERNATE – When the entity is previously retrieved, an entity with a composite ID cannot be combined.
The project I’m working on requires the data in our system to be synchronized with the data in another system (the other system is very popular, which is why synchronization is so important). Howev