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Literals in JPQL and Criteria Queries
Describes literals in JPQL, including null, false, true, numbers, strings, dates enums and types.... including NULL , boolean literals ( TRUE and FALSE ), numeric literals (e.g. 100 ), string literals (e.g. ... SQL, JPQL supports two boolean literals - TRUE and FALSE . Since JPQL is case insensitive, TRUE is equivalent to true and ...
Logical Operators in JPQL and Criteria API
Explains how to use AND, OR and NOT in JPQL queries.... operand of an AND operator must be one of: TRUE, FALSE , and NULL . The following table shows how the AND ... TRUE FALSE NULL ...
Comparison in JPQL and Criteria API
Explains how comparison operators can be used in JPQL queries, including in comparing null values.... == FALSE TRUE ... TRUE FALSE Comparison operators are always evaluated to ...
@JoinColumn(nullable=false)
During the evaluation of ObjectDB (We're currently developing with EclipseLink/mysql) I noticed was the following: ... following: I marked a @Column as nullable=false Than I tried to save it with the property as null ... ( name = "alarm_group_id" , nullable = false ) private AlarmGroup alarmGroup ; ...
Database Management Settings
Explains settings and performance tuning of the ObjectDB Java object database for JPA/JDO.... <recovery enabled = "true" sync = "false" path = "." max = "128mb" /> <recording enabled = "false" sync = "false" path = "." mode = "write" /> ...
Entity Management Settings
Explains settings and performance tuning of JPA entities in ObjectDB, the fast Java object database for JPA/JDO.... "0mb" /> <persist serialization = "false" /> <cascade-persist always = "auto" on-persist = "false" on-commit = "true" /> <dirty-tracking arrays ...
Type ... is not defined as an entity (@Entity is missing) (error 302)
Hello, I am using ObjectDB 2.2.8_08 with eclipse 3.6 and Groovy objects. I am attempting to persist an instance of CultureRqst in the project com.epimss.lab by using a Connection class imported from the project com.epimss.admin. I can access the database OK, but attempting to persist the CultureRqst leads to the following exceptions: ... { // Common Boolean candS = false Boolean gramStain = false Boolean fungal = false OtherRqst ...
[ODB1] Chapter 4 - JDO Metadata
Shows how to define JDO metadata for persistence capable classes.... <class name = "D" requires-extent = "false" /> </package > </jdo > A JDO ... name, has to be specified. requires-extent (true | false) By default, JDO manages an extent for every persistent class. An ...
New to Product & Having An Issue
Greetings ObjectDB Users! I'm new to the product, and I've setup a simple test after reading the tutorial, and I'm running into some issues with queries, specifically querying by primary key. I have a domain object class Called Department, which has a member of type DomainId. DomainId has two member fields: String accountId and String objectId. The following code shows these two classes.... == null ) return false ; return this . domainId . equals ( obj ... @ Basic ( optional = false ) public String getAccountId ( ) { ...
Connection is closed Caused by: java.io.EOFException
I am getting this exception on a regular basis, after a period of time of repeating the same code execution. I don't understand why. I restart the DB server and my code works again for another period of time until same exception is encountered again. I cannot pin down a pattern e.g. after a certain period of time, because the time periods between exceptions are not regular, although frequent. Any test case I use will pass most of the time but will fail after an undetermined period. ... = "$objectdb/log/" max = "8mb" stdout = "false" stderr = "false" /> <log-archive path = "$objectdb/log/archive/" ...
