131 | Is there a function of "drop table" or "delete from table"?Besides the em.remove() one by one, is there a function of "drop table" or "delete from table"? TIA ... . Yes, you'd better to put it into manual, since "drop table" is often in debugging. I can not find "drop table" in this site BTW. gzdillon Lai Yang The code “createQuery("DELETE FROM MyEntity e |
99 | alter tableHi: After a table built by real data, how to alter table structure, such as: alter table add column ... alter table add index ... TIA gzdillon Lai Yang There are no tables is ObjectDB. Anyway, > alter table add column ... This is automatic - just change your class (see Database Schema Evolution in |
96 | joining of tables want join tow table and generate a third table. Ex: table 1: employee table 2: address and the generate table will be table 3: emp_add employee: e_id, e_name address: add_id, city, house_no; the third table will be like. emp_add: e_id, add_id i am using annotation like: in Employee class |
96 | how to create only table structure.hi, I want to create only a table without insertions of data. And also table contains constraints like not_null, unique, primary key etc. Ex: (In sql) create table emp (id int(5) primary key, name varchar2(20)); , so it will create only table. when we want to see the table structure then "desc emp |
94 | How to Remove records from many to many relationship tables in JPA have Relation tables TransportationEvent and Conclusion , relations like @Entity public class ... i have got another two table like Conclusion_TransportationEvent and TransportationEvent_Conclusion here my requirement is i need to delete records in both tables (TransportationEvent and Conclusion |
37 | Database Explorer provides two types of viewer windows for viewing the database data. The Table window follows the approach of traditional visual database tools. Every row in the table represents a single object ... ] tabbed window or an object in a currently open Table or Tree window). You can open a new viewer |
28 | Auto Generated Values sequence values. The Table Strategy The TABLE strategy is very similar to the SEQUENCE strategy ... EntityWithTableId { @GeneratedValue(strategy=GenerationType.TABLE, generator="tab") @Id long id; } ORM ... a sequence using a table to support this strategy. ObjectDB does not have tables, so the TABLE and SEQUENCE |
20 | Logical Operators in JPQL and Criteria API of logical operators, as shown in the following table: Set 1 - JPQL / SQL Set 2 - Java / JDO AND && OR ... must be one of: TRUE, FALSE, and NULL. The following table shows how the AND operator is evaluated based ... must be one of: TRUE, FALSE, and NULL. The following table shows how the OR operator is evaluated based |
3 | [ODB1] Chapter 9 - ObjectDB Explorer objects. The Table window displays a collection of objects following the approach of traditional visual database tools. Every row in the table represents a single object, every column represents ... of that object. Select an object in a currently open table or browser viewer to explore it in a new |
2 | [ODB1] Chapter 1 - About ObjectDB with a Relational Database Management Systems (RDBMS) is difficult because developers must deal with tables ... . Most other JDO implementations map classes and objects to tables and records in an RDBMS. Using such mapping ... database concepts and the tables and columns defined for an application in order to perform the necessary |
