hsqldb

HSQLDB 是一个轻量级的纯Java开发的开放源代码的关系数据库系统。因为 HSQLDB 的轻量（占用空间小），使用简单，支持内存运行方式等特点， HSQLDB 被广泛用于开发环境和某些中小型系统中。 HSQLDB 的运行需要Java环境的支持。 HSQLDB 的四种运行模式： 运行模式 说明 启动命令 JDBC例 内存 (Memory-Only) 模式 所有数据都在内存里操作。应用程序退出后则数据被销毁。 启动方式1：通过程序中首次调用 Connection c = DriverManager.getConnection("jdbc:hsqldb:mem:myDbName", "sa", "");时 启动方式2：你也可以在server.properties中指定相同的URL来运行一个Memory-Only（仅处于内存中）服务器实例。 jdbc:hsqldb:mem:myDbName 进程 (In-Process) 模式 从应用程序启动数据库。因为所有数据被写入到文件中，所以即使应用程序退出后，数据也不会被销毁。 跟Memory-Only模式一样， In-Process不需要另外启动，通过DriverManager.getConnection(jdbcUriName, "sa", "");方式既可启动 jdbc:hsqldb: file:/C:/mydb/myDbNamejdbc

suppose i have a sequence, called TEST_SEQ what would be the correct way of selecting its next value ? this does not work: select next value for TEST_SEQ probably because it expects a "FROM" clause. looking at HSQLDialect.getSequenceNextValString() in hibernate i see this: "select next value for " + sequenceName + " from dual_" + sequenceName which in my case would result in something like: select next value for TEST_SEQ from dual_TEST_SEQ which does not work for 2.0.0-rc8 (i only assume this works in pre-2.0 versions - havent verified) I've come across a solution that involves creating a

I have the following hsqldb table, in which I map UUIDs to auto incremented IDs: SHORT_ID (BIG INT, PK, auto incremented) | UUID (VARCHAR, unique) Create command: CREATE TABLE mytable (SHORT_ID BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY, UUID VARCHAR(36) UNIQUE) In order to add new pairs concurrently, I want to use the atomic MERGE INTO statement. So my (prepared) statement looks like this: MERGE INTO mytable USING (VALUES(CAST(? AS VARCHAR(36)))) AS v(x) ON mytable.UUID = v.x WHEN NOT MATCHED THEN INSERT VALUES v.x When I execute the statement (setting the placeholder correctly), I

I am using junit4 with spring to test my rest web services. For this, I am using HSQL in memory database. To clean the records after every test case, I am removing all the records from tables. But I want to delete only inserted records. I am adding data to database in two places: In Junit test cases. In the rest services. I am making http calls to test the services. Also, I am using same in-memory database in rest services. Kindly help me in removing only inserted records after each test cases. Edited : My concern is deleting the inserted records in http calls to rest services. It is really

I'm writing a desktop java application for an environment without a network connection. I'm trying to store the application data as securely as I can in an encrypted in-process hsqldb, with an unencrypted user information hsqldb. Hsqldb requires that the crypto_key be set in the jdbcurl when the connection is created. My application uses hibernate to do persistence and Spring to do configuration and injection. My current scheme is to store username, password hash, salt and the encrypted database's crypto_key in the unencrypted user table. The crypto_key is protected by an asymmetric encryption

I am working on a spring webflow project and I am thinking can I use HSQLDB and not my mysql for junit testing? How can I clone my mysql database into HSQLDB If you are using spring 3.1 or greater you could use spring profiles to achieve this. The default profile is loaded when no active profile is set. <beans profile="dev"> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="org.hsqldb.jdbcDriver" /> ...other datasource properties also create or drop db </bean> </beans> <beans profile="default"> <bean id=

I am new to HIbernate and was practicing some examples on One-to-many mapping but I am not getting why it is throwing error. 1)Employee.java package com.common.pojo; import java.util.Set; public class Employee { private int id; private String name; private Set certificate; public Employee (){} public Employee(String name) { this.name = name; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Set getCertificate() { return certificate; } public void setCertificate