derby

问题 I'm new to this forum (first post) but I used to surf on it a lot of times to find tricks and some useful examples and solutions on my problems. Before posting I have search all over the web about the "restoreFrom" derby database command and I read the derby administrator, the reference guide too. I succesfully use in my program the creation, backup and check intergrity derby procedures, connect, disconnect server and database etc... but no way to restore something with built-in procedure !!!

问题 Is there a setting in derby, for example an sql query ala "SET DATABASE REFERENTIAL INTEGRITY FALSE" where i can turn on and off referential integrity? 回答1: According to this post on the mailing list (from 2006) it is not possible: http://www.mail-archive.com/derby-user@db.apache.org/msg05345.html I couldn't find anything in the manual either. And the list of jdbc parameters has nothing, too. 回答2: If you have a constraint that you don't wish to enforce, you can use DROP CONSTRAINT to drop it.

问题 I have developed an application with derby db. I have created DB in my system. I need to deliver the application along with the db. I have deleted all the data from tables. Only the tables(structure with empty data) are remaining. So If I copy the db files (log,seg0,tmp,db.lck,service.properties all these in a single folder) to another system, will it work fine..? 回答1: Yes, it will work fine, although for the cleanest flow you should ensure that no application is accessing the database at the

问题 I created a embedded derby in JDBC mode but when I try to access it in java class it gives me error: java.sql.SQLException: Failed to create database 'myDB', see the next exception for details. at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source) at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source) at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source) at org.apache.derby.impl.jdbc.EmbedConnection.createDatabase(Unknown Source) at

问题 I just read here, that the Java DB (respectively Derby) is shipped with the JDK. Where is the derby.jar within the Java installation on my Mac? The terminal command /usr/libexec/java_home prints /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home and ls -halt /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home drwxr-xr-x 10 root wheel 320B 6 Okt 14:29 . drwxr-xr-x 5 root wheel 160B 6 Okt 14:29 .. -r--r--r-- 1 root wheel 160B 6 Okt 14:29 README.html drwxr-xr-x 34 root

问题 How does one do this? The SYSCOLUMNS system table only has columns for tables. SYSCHECKS has a REFERENCEDCOLUMNS object. Is there any way to get this. I'm aware of the JDBC getPrimaryKeys call, but that doesn't get unique constraint columns. 回答1: Derby - constraints It took some digging to find the above question; my question is a partially answered follow-up question to the one above. Taking the CONSTRAINTID against SYSKEYS gives a CONGLOMERATEID, which when taken against SYSCONGLOMERATES

问题 I develop some unit tests with trying to connect to the Derby internal database but get the following: WARNING: Local Exception Stack: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: java.sql.SQLSyntaxErrorException: Table/View 'SEQUENCE' does not exist. Error Code: 20000 Call: UPDATE SEQUENCE SET SEQ_COUNT = SEQ_COUNT + ? WHERE SEQ_NAME = ? bind => [2 parameters bound] Query:

问题 I was following the following instructions: http://www.eclipse.org/articles/article.php?file=Article-EclipseDbWebapps/index.html in order to set-up a derby database server and everything works fine. I created the DB and could easily access it. however, these instructions use JSP to access my DB and I wand to change it so that I can access the DB through my custom Java classes but I cant create any connections to the DB. I simply tried: Connection con = DriverManager.getConnection ("jdbc:derby

问题 I have used Embedded derby earlier in my spring boot projects. But now when i created the project through Spring Initializr with the derby dependency. I get the below error : Schema 'SA' does not exist followed by org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL via JDBC Statement When i tried running the earlier project that i had created, the Derby is working just fine. PFB the console for the earlier project : 2018-03-18 15:34:44.346 INFO 16560 --- [

问题 I have a project that uses Hibernate 4.0.1 to interact with a derby database. That works fine. Here is a sample program that simply connects to the database and doesn't do anything: import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class DbTestMain { public static void main(String... args){ Configuration derbyConfiguration = new Configuration().configure("hibernate-derby.cfg.xml"); SessionFactory derbySF = derbyConfiguration