hsqldb

问题 I want to use HSQLDB in a production environment for stroring some data in memory and for data export using files. Does anybody have experience with using hsqldb in production environments? Is hsqldb treating server resources gracefully and does it cleanup unused resources properly? I've seen a critical post on those issues from red hat and I'm wondering whether this still holds for hsqldb: http://kbase.redhat.com/faq/docs/DOC-15194 回答1: I've used hsql on numerous occasions in production

问题 I want to use HSQLDB in a production environment for stroring some data in memory and for data export using files. Does anybody have experience with using hsqldb in production environments? Is hsqldb treating server resources gracefully and does it cleanup unused resources properly? I've seen a critical post on those issues from red hat and I'm wondering whether this still holds for hsqldb: http://kbase.redhat.com/faq/docs/DOC-15194 回答1: I've used hsql on numerous occasions in production

问题 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

问题 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

问题 I am trying to deal with multitheading in Java. I have read many articles and question(here on StackOverflow) but didn't find any clear examples how to use it. I have Unique_Numbers table in HsqlDB database. There are 2 columns: NUMBER and QTY. My task is to check if number exsists and increase QTY of number if yes and insert this number if not. So, what did I get. This is my configuration of Database private final ComboPooledDataSource dataSource; public Database(String url, String userName,

问题 i am using hsqldb as my database. i want whenerver my select query, update query execute it will shutdown a database. below is the method in which i need a code from which i can manually shutdown my database. private void insertInitData(BasicDataSource dataSource, int lmexAdapterId, int lmsId) { try { JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource); String lmexPostParam_id = UUID.randomUUID().toString(); String inertQuery = "Insert into lmex_post_param (lmex_post_param_id, param_name

问题 How to turn off forced upper-case mode for table and column names in HSQL? <artifactId>hsqldb</artifactId> <version>2.3.1</version> OS: Windows 7 x64 回答1: The rules around this are explained in the HSQLDB documentation: When a database object is created with one of the CREATE statements or renamed with the ALTER statement, if the name is enclosed in double quotes, the exact name is used as the case-normal form. But if it is not enclosed in double quotes, the name is converted to uppercase and

问题 I am new to hsqldb. I am developing simple application to get the some input from user. So Searched for embedded database and found hsqldb is the solution for my requirement. I have some create table syntax but it throws exception. (This Query executed by using Netbeans Database services) Query : CREATE TABLE company ( comp_name varchar(100) NOT NULL, comp_id int(40) NOT NULL AUTO_INCREMENT, PRIMARY KEY (comp_id) ); or CREATE TABLE company ( comp_name varchar(100) NOT NULL, comp_id int(40)

问题 I am new to hsqldb. I am developing simple application to get the some input from user. So Searched for embedded database and found hsqldb is the solution for my requirement. I have some create table syntax but it throws exception. (This Query executed by using Netbeans Database services) Query : CREATE TABLE company ( comp_name varchar(100) NOT NULL, comp_id int(40) NOT NULL AUTO_INCREMENT, PRIMARY KEY (comp_id) ); or CREATE TABLE company ( comp_name varchar(100) NOT NULL, comp_id int(40)

问题 I'm looking for a standard SQL " UPSERT " statement. A one call for insert and update if exists. I'm looking for a working, efficient and cross platform call. I've seen MERGE , UPSERT , REPLACE , INSERT .. ON DUPLICATE UPDATE but no statement meets the needs. BTW I use MYSQL and HSQLDB for unitests. I understand that HSQLDB is limited and may not cover what I need, but I couldn't find a standard way even without it. A statement that only MYSQL and HSQLDB will also be enough for now. I've been