derby

一. Derby能提供什么? Derby是一个基于Java和SQL ，开源的 RDBMS 。完全使用Java实现，他为用户提供了一个小巧的基于标准的数据库引擎，他可以嵌入到任Java解决方案中，他确保数据完成并提供复杂的事务支持。Derby的数据完全存储在磁盘上，他是一可携带的数据库，你可以将他从一台机器拷贝到另一台机器。更多信息请访问 http://db.apache.org/derby 二. Derby如何开始？ Derby的两种模式：内嵌模式【他和你应用程序在同一个JVM中,不需要单独配置和你的应用程序有相同的生命周期】、服务模式【运行在独立的JVM中，需要网络配置这点类似于Mysql等数据库】 系统要求：Derby 使用 Java 开发依赖于JDK ，要求JDK版本 1.5+ 。查看版本可以使用命令 java -version 下载安装Derby : 下载地址： http://db.apache.org/derby/derby_downloads.html 设置环境变量： DERBY_HOME 变量值=解压的目录，目录的结构就不解释了。 设置Path 和 CLASSPATH ： 在 Path中增加 %DERBY_HOME%\bin 、在 CLASSPATH 中增加 %DERBY_HOME%\lib 三. 有哪些工具？怎样用？ ij 是Derby交互式JDBC脚本工具

I'm having a problem with my ORMLite package . When I generate the schema for a table, I thought it would be a good practice to escape all entity names. This would protect some Java class or field name from being a SQL reserved word: CREATE TABLE "footable" ("stuff" VARCHAR(255)) I'm now adding "raw" query support so that ORMLite can help users perform their own queries. However, I find that with Derby and Hsqldb, the entity names cannot be used without escaping. For example, the following query: SELECT * FROM footable generates the following errors: Derby: ERROR 42X05: Table/View 'FOOTABLE'

I have a problem with querying Derby database. I am using Hibernate with JPA. Problem is related (probably) to boolean columns. Each query ends with error: org.hibernate.exception.SQLGrammarException: Comparisons between 'BOOLEAN' and 'INTEGER' are not supported. Types must be comparable. String types must also have matching collation. If collation does not match, a possible solution is to cast operands to force them to the default collation (e.g. SELECT tablename FROM sys.systables WHERE CAST(tablename AS VARCHAR(128)) = 'T1') Below you may find sample code and configuration. Samples are

Please have a look at the following code DataBaseConnector.java import java.sql.*; import javax.swing.*; public class DataBaseConnector { private Connection con; public DataBaseConnector() { } private boolean createConnection() { try { Class.forName("org.apache.derby.jdbc.EmbeddedDriver"); con = DriverManager.getConnection("jdbc:derby://localhost:1527/contact;create=true","yohanrw","knight"); } catch(Exception e) { System.out.println("Error getConnection"); e.printStackTrace(); JOptionPane.showMessageDialog(null,e.getLocalizedMessage()); return false; } return true; } private void

I'm getting this error: java.sql.SQLException: ResultSet not open. Operation 'next' not permitted. Verify that autocommit is off. when I'm trying to create instances from a db. Current code: try { connection.setAutoCommit(false); stmt = connection.createStatement(); results = stmt.executeQuery("SELECT * from animalTable"); int AnimalCat = -1; System.out.print(connection.getAutoCommit()); //getting error on line below while(results.next()) { int ID = results.getInt(1); int Age = results.getInt(2); String Name = results.getString(3); String AType = results.getString(4); String Breed = results