derby

java连接使用Derby

由 Deadly 提交于 2020-03-02 13:11:16
1.首先下载Derby， 下载点击这里 ，选择自己的JDK对应的版本，我的是JDK8，下载对应版本 2.配置环境变量 DERBT_INSTALL：D:\derby\db-derby-10.14.2.0-bin （对应自己解压的位置） DERBY_HOME：D:\derby\db-derby-10.14.2.0-bin （对应自己解压的位置） CLASSPATH：;%DERBY_HOME%\lib\derbytools.jar;%DERBY_HOME%\lib\derby.jar （加到后面） path：%DERBY_HOME%\bin （加到后面） 3.测试是否成功安装 打开命令行 ，运行 sysinfo，看是否出现如下信息： 4.直接使用Derby（不用java） 选择目录，用于存储数据，在该目录调出cmd，输入ij，如下： 第一次使用需要连接该目录，输入 connect'jdbc:derby:mydb;create=true'; 这样就可以对数据库进行增删改查操作了。 来源： CSDN 作者： SuXing_ 链接： https://blog.csdn.net/SuXing_/article/details/104608419

How to copy external dependency to Open Liberty during maven build

由 我们两清 提交于 2020-02-24 11:58:06
问题 I need to copy derby.jar into Open Liberty shared directory ${project.build.directory}/liberty/wlp/usr/shared/resources/ . I have the following setup in the pom.xml file: <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>2.10</version> <executions> <execution> <id>copy-derby-dependency</id> <phase>package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <includeArtifactIds>derby</includeArtifactIds>

derby数据库ql语法

由 我只是一个虾纸丫 提交于 2020-02-10 05:34:11
【数据库知识】 主键、唯一键包含索引 主键包含唯一键、索引、非空 唯一键包含索引，可空或非空 数据库需要与执行服务的在同个目录下 唯一键 create table app.tyu ( primarykey int primary key, com_no int not null unique, name varchar(32) default 'jack' ) 自动加值 GENERATED ALWAYS AS IDENTITY create table svse ( uid int generated by default as identity, Uname varchar(5) , Upass varchar(10), constraint P_KEY_1 primary key (uid) ) 查询所有索引 select * from sys.sysconglomerates, sys.SYSCONSTRAINTS where sys.SYSCONGLOMERATES.TABLEID = sys.SYSCONGLOMERATES.TABLEID 创建索引 create index 索引名 on 表名(字段1, 字段2) 删除索引 drop index 索引名 在创建整数时，若要控制整数的位数，可使用decimal来表示 如int(2)可表示为decimal(2,0)

Couldn't install derby in eclipse

由 ぐ巨炮叔叔 提交于 2020-01-30 13:11:25
问题 I'm new to java . I'm using eclipse. I want to create database project using derby . I installed two files for derby called derby_ui_doc_plugin_1.1.3.zip and derby_core_plugin_10.8.2.zip and extracted them in plug ins of eclipse but when I opened the eclipse I couldn't find data management or data source or anything that told me that derby is installed . Thanks in advance i'm working on Kepler Service Release 2 if version is old . how can i update it ? 回答1: These plugins are very old and are

Update Entity Relationship via UPDATE .. SET Query

由 邮差的信 提交于 2020-01-25 07:37:10
问题 I have two entities: class A { @OneToMany(mappedBy = "a") List<B> bs; // getter/ setter } class B { @ManyToOne A a; // getter/ setter } To delete one b, I first need to invalidate that relationship. "Traditionally" I would do something like that: A a = em.getReference(A.class, entityIdA) B b = em.getReference(B.class, entityIdB); a.getBs().remove(b); b.setA(null); em.remove(b); This is not very performant, if the List of a 's is getting large (a few hundreds in my case). I know I can also use

Update Entity Relationship via UPDATE .. SET Query

由 ∥☆過路亽．° 提交于 2020-01-25 07:37:05
问题 I have two entities: class A { @OneToMany(mappedBy = "a") List<B> bs; // getter/ setter } class B { @ManyToOne A a; // getter/ setter } To delete one b, I first need to invalidate that relationship. "Traditionally" I would do something like that: A a = em.getReference(A.class, entityIdA) B b = em.getReference(B.class, entityIdB); a.getBs().remove(b); b.setA(null); em.remove(b); This is not very performant, if the List of a 's is getting large (a few hundreds in my case). I know I can also use

connect embedded derby database with struts application

由 自闭症网瘾萝莉.ら 提交于 2020-01-25 02:21:14
问题 i have an embedded derby database "end_user" and i want to pre-populate the table "user" with a few records before accessing it via a struts2 application. For this, i need to set the url of the database, but i don't know what url to set. the struts application is deployed as a war in apache-tomcat/webapps. I have currently tried this: jdbc:derby:1527/ But this does not seem to help in any way. I even tried hardcoding the path of the db i created (ie. C:\apache-tomcat\end_user) and even that

Is it necessary to create tables each time you connect the derby database?

由 拜拜、爱过 提交于 2020-01-18 05:45:11
问题 I created a schema and few tables manually using the Eclipse database development perspective. But whenever I try to access the table from code, I get "Schema does not exist" error. However, if I create the tables within my program just before using them, all go well. Do I have to create the tables each time I connect to database? Since, I am testing my code, I have to restart the project multiple times. 回答1: Three common reasons for "table does not exist" when you think you've already

What is the correct way to include a variable inside an Apache derby Export_Query

由 久未见 提交于 2020-01-15 11:09:07
问题 I am trying to export data from a derby table to a file. I'm having issues with the WHERE clause. What I have is this. s.execute("CALL SYSCS_UTIL.SYSCS_EXPORT_QUERY('SELECT *FROM REPORT WHERE DATE = " + conversion.getDate() + " ' , 'C:\\Pos\\daily_report.csv' , ',' , null, null)"); This exception Java.sql.SQLSyntaxErrorException: Syntax error: Encountered "Sep" at line 1, column 37. was thrown while evaluating an expression. Could someone direct me regarding this. 回答1: I found it. s.execute(

Failed on insert row using CachedRowSet

由 对着背影说爱祢 提交于 2020-01-15 04:56:06
问题 I am using CachedRowSetImpl , I can get data from Database , BUT I can not insert . this is the Code : public class NewClass { static final String DATABASE_URL = "jdbc:derby://localhost:1527/TaskDB;create=true"; static final String USERNAME = "user"; static final String PASSWORD = "user"; public static void main (String [] agr) throws SQLException { CachedRowSetImpl rs = new CachedRowSetImpl(); rs.setUrl(DATABASE_URL); rs.setUsername(USERNAME); rs.setPassword(PASSWORD); rs.setCommand("SELECT
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