merge dragons update

forOraclethe two-table Joint update scenario (withA,Btwo tables, toa.id=b.idAssociation, according toBrecord updates in the tableAthe corresponding fields in the table), typicallyUpdateinline views andMergetwo ways, the following examples are: To create a use case table: CREATE table Test1 (ID number (), name VARCHAR2 (20)); CREATE TABLE Test2 (ID number (), name VARCHAR2 (20)); Test data: Begin INSERT into test1 values (1, ' A '); INSERT into test1

The merge statement is often used in the conversion and loading processes in the Data warehouse, and here is a quick summary. The merge statement is a new syntax for merging update and INSERT statements oracle9i. Through the merge statement, according to a table or the join conditions of a subquery to query the other

1, first saveorupdate return void that is nothing to return and merge will return an object2, the next saveorupdate is: Automatically determine whether the object has been persistent, if it has been persisted using the update operation or save operation, merge after executing the Session.merge (a) code, the A object is still not persisted state, A object will sti

Tags: same different. NET match Big Data operations additions and deletions change large number strong tail/*merge into detailed introductionThe merge statement is a new syntax for merging the UPDATE and INSERT statements oracle9i.With the merge statement, another table is queried based on the join criteria of one tabl

Hibernate three states of distinction, and the use of save,update,saveorupdate,merge, etc.There are 3 types of Hibernate objects: Transient (Transient), persistent (persistent), and off-state (Detached). Objects that are in persistent state are also known as PO (Persistence object), and instantaneous and de-tube objects are also known as VO (Value object). Instantaneous State A Java object that opens up mem

same as the instantaneous object, the JVM will recycle it at the appropriate time without any variables referencing it; 2. More than the instantaneous object a database record identity value. Hibernate of various ways of saving (Save,persist,update,saveorupdte,merge,flush,lock) and three states of objects Hibernate save Hibernate there are so many ways to save objects, and there are a lot of difference

Original: Http://blog.csdn.net/bruesz/archive/2007/11/20/1894836.aspx motivation: Want to use an SQL statement directly in Oracle to Insert/update operations. Description: When writing SQL statements, we often encounter a large number of simultaneous insert/update statements, that is, updating (update) when there is a record, and inserting (insert) when there is

it, the JVM will recycle it at the appropriate time; 2. More than the instantaneous object a database record identification value. Hibernate's various Save methods (Save,persist,update,saveorupdte,merge,flush,lock) and three states of the object Hibernate save Hibernate offers too many ways to save objects, and there are a lot of differences between them. I. Preliminary knowledge for Hibernate, its

The did a test today and wrote a test case to see what the difference is between the log that the console prints when the merge is in and the update. The entity bean is simple, with ID and name two fields, and then the console log content of the following test scenarios: 1. The database record already exists, and the name of the person is changed to a new name. The

Today I did a test and wrote a test case to see what the difference is between merge and the log that the console prints when the update was made. Entity beans are simple, with IDs and name two fields, and then the console log content for the following test scenarios, respectively:1. Database record already exists, change person's name to a new name.The merge met

ObjectiveLearn NH This framework today, in the new object, see the Great God with the persist and did not use Save, the mind is more puzzled, consult the information, found this write very good, reproduced for your reference.Hibernate saveHibernate offers too many ways to save objects, and there are a lot of differences between them, and here's a little bit of a different way:First, the preparation of knowledge:Before all, for Hibernate, it has three states of objects, transient, persistent, det

If you want to add data when there is no data, or update or delete data when there is data, you must first select the statement to determine whether to insert, update, or delete data, the merge indexing method can save these steps, and the entire method is included. Merge is defined in the standard of SQL 2003. Suppor

warehouse to obtain the project source code That is, the clone project, which operates as follows: Enter the remote warehouse address to be filled in when the small Zhang push Next, you can clone the project from the remote repository to the local warehouse and IDE workspace by following the wizard. scene Three: Xiao Yuan modified part of the source code, submitted to the remote warehouse This operation is basically consistent with the first submission process, respectively, with the ADD-> co

This is a very common requirement. When we insert a record into a table, if the record already exists (usually with the same primary key/other conditions), we should not insert the record repeatedly, instead, update the record. Therefore, our original idea is generally to have such a stored procedure/method/SQL, first determine whether the record exists, and then decide whether to update or insert it. The f

Reprinted from the Heaven of stealingMotivation:You want to do insert/update directly with an SQL statement in Oracle.DescriptionWhen writing SQL statements, we often encounter a large number of simultaneous insert/update statements, that is, when there is a record, it is updated (update), when no data exists, insert (insert).Actual combat:Next we have a task, th

Tags: how the body cond directly is what ACL logic commonly used blogMotivation:You want to do insert/update directly with an SQL statement in Oracle.DescriptionWhen writing SQL statements, we often encounter a large number of simultaneous insert/update statements, that is, when there is a record, it is updated (update), when no data exists, insert (insert).Actua

The following example uses MERGE to update the ProductInventory table in the AdventureWorks sample database every day based on the processed orders in the SalesOrderDetail table. Update the Quantity column of the ProductInventory table by subtracting the number of orders for each product in the SalesOrderDetail table every day. If the subscription of a product Th

Requirement: how to merge multiple update statements into one update statement: For example, update Table1 set Col = '000000' where id = '000000' Update Table1 set Col = '20140901' where id = '20160901' How to merge into one? A

-filter (" D "). assess_id "=1265 and" D "." staff_id "=8 and" D "." target_model_id "=332 and" D "." State "= ' 2") 6-access ("D".) seq_id "=:B1" 7-filter ("A".) Area_name "= ' Yongxing sub-branches ') 8-access (" D ".) area_id "=" A "." AREA_ID ") Statistical information----------------------------------------------------------1 recursive calls 0 db bl Ock gets 32670 consistent gets Physical reads 0 redo size 536 bytes sent via sql*net to client 978 bytes receive D via sql*net from cli