javadb

In-memory Java DB [closed]

由 左心房为你撑大大i 提交于 2019-12-09 06:05:45
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Are there any DBs for Java that can be run in an embedded mode with some tables being stored in-memory while loading others from disk? H2 and JavaDB seem to be the two leaders for Java DBs and I know they both have an in-memory mode, but do they make you load the whole DB into memory or can you decide on a table

Class [org.apache.derby.jdbc.ClientDriver] not found Exception [duplicate]

由 家住魔仙堡 提交于 2019-12-09 03:58:21
问题 This question already has an answer here : Class [org.apache.derby.jdbc.ClientDriver] not found. When trying to connect to db (1 answer) Closed 4 years ago . ![JAVADB_DRIVER_LABEL library missing][1] I am trying to connect to a JavaDB through netbeans 8 IDE on Windows 7. i can connect it using the DB manager provided with netbeans in Services panel. But when trying to connect it through my code I get ClassNotFoundException for the org.apache.derby.jdbc.ClientDriver class. I could not run the

JavaDB - Checking if a database exists

由 心已入冬 提交于 2019-12-08 20:53:15
问题 We created a java application which uses the JavaDB database in Netbeans IDE. We want the program to check every time it starts if the database's tables have already been created, and otherwise create them. How do we do that? thanx 回答1: I use : DatabaseMetaData metas; ResultSet tables; Statement stat; m_connexion = DriverManager.getConnection("jdbc:derby:mybase;create=true"); metas = m_connexion.getMetaData(); stat = m_connexion.createStatement(); tables = metas.getTables(m_connexion

Netbeans not starting Java DB Server with JDK 1.8.0_40

由 限于喜欢 提交于 2019-12-08 10:08:33
问题 That's my setup: 1) Windows 8.1 2) JDK 1.8.0_40 3) Netbenas 8.0.2 The system was running JDK 1.8.0_31 and everything was working pretty well. JDK 1.8.0_31 was uninstalled and JDK 1.8.0_40 installed and JAVA_HOME var was adjusted to reflect the new JDK version, from C:\java\jdk1.8.0_31 to C:\java\jdk1.8.0_40. I applied the following changes to my Netbeans: 1) Menu Tools | Libraries: 'Java DB Driver' was changed to reflect the libraries which come with JDK version: C:\java\jdk1.8.0_40\db\lib

Case insensitive search in Java DB (Derby)

由 瘦欲@ 提交于 2019-12-07 03:16:28
问题 I'm using Derby and I can't find a way to do case insensitive search. For example, I have a table that I'm searching that contains "Hello" but I put a search query in for "hello" and at the moment I won't get a result, but I want to. I can't find the correct syntax for it. Sara 回答1: You can use the UPPER() or LOWER() SQL functions on both your search argument and the field, like in SELECT * FROM mytab WHERE UPPER(lastname) = UPPER('McDonalds') 回答2: The most common way to do this is to use

How to use the SQL RANDOM() function in a Netbeans JavaDB

由 人盡茶涼 提交于 2019-12-06 11:00:23
I need to do a SQL call in a small local JavaDB in Netbeans 7.2 to pull a single random row from the database. SELECT * FROM JAVA2.FORTUNES ORDER BY RANDOM() So far, I've got it to work using the RANDOM() function, but I'm having trouble getting LIMIT 1 to work, it returns a syntax error. I know that every database has a different way to do this, and I can't figure out how it works specifically for this JavaDB in Netbeans (I got it to work in a separate Oracle DB with different syntax). Is there a Java DB specific, or ANSII standard way to return a single row using the above syntax? Java DB

How should I use UUID with JavaDB/Derby and JDBC?

由 旧街凉风 提交于 2019-12-06 05:29:01
问题 I currently use INT as type for primary key in JavaDB (Apache Derby), but since I'm implementing an distributed system I would like to change the type to java.util.UUID. A few questions about this: What datatype in JavaDB/Derby should I use for UUID? I have seen CHAR(16) FOR BIT DATA been mentioned but I don't know much about it. Is VARCHAR(16) an alternative? How should I use it with JDBC? E.g. in an PreparedStatement , how should I set and get an UUID? If I later would likte to change

JavaDB ( derby ) path to database?

由 孤街醉人 提交于 2019-12-05 19:09:23
Using the embedded driver I can connect to my derby database using the JDBC url: jdbc:derby:mydbname But, I usually put the full path for the db like: jdbc:derby:/Users/oreyes/dbs/mydbname Is there a way I can just specify the db name and have something like a "db_path" or something like that? I'm not an expert with derby, setting derby.system.home as described in developers guide seems to work as you expect. 来源： https://stackoverflow.com/questions/3231614/javadb-derby-path-to-database

Case insensitive search in Java DB (Derby)

由 北战南征 提交于 2019-12-05 07:42:47
I'm using Derby and I can't find a way to do case insensitive search. For example, I have a table that I'm searching that contains "Hello" but I put a search query in for "hello" and at the moment I won't get a result, but I want to. I can't find the correct syntax for it. Sara You can use the UPPER() or LOWER() SQL functions on both your search argument and the field, like in SELECT * FROM mytab WHERE UPPER(lastname) = UPPER('McDonalds') The most common way to do this is to use generated columns. Here's a nice writeup from one of the Derby developers: http://blogs.oracle.com/kah/entry/derby

How should I use UUID with JavaDB/Derby and JDBC?

由 ￡可爱￡侵袭症＋ 提交于 2019-12-04 11:22:24
I currently use INT as type for primary key in JavaDB (Apache Derby), but since I'm implementing an distributed system I would like to change the type to java.util.UUID . A few questions about this: What datatype in JavaDB/Derby should I use for UUID? I have seen CHAR(16) FOR BIT DATA been mentioned but I don't know much about it. Is VARCHAR(16) an alternative? How should I use it with JDBC? E.g. in an PreparedStatement , how should I set and get an UUID? If I later would likte to change database to SQL Server, is there a compatible datatype to java.util.UUID? Simply, How should I use UUID
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