derby

Cannot alter column in existing table in java Derby database

由 时光怂恿深爱的人放手 提交于 2019-12-08 02:03:51
问题 I am trying to alter my table by changing one of the columns in the table. But, I am encountering an error while I execute the following sql command - ALTER TABLE WALLETUSER MODIFY WALLETUSERNAME VARCHAR NOT NULL; The error i receive is - Error code -1, SQL state 42X01: Syntax error: Encountered "MODIFY" at line 1, column 24. Would appreciate any help. 回答1: Try this instead: ALTER TABLE WALLETUSER ALTER COLUMN WALLETUSERNAME NOT NULL; Full syntax guide: ALTER TABLE table-Name { ADD COLUMN

Spring Boot: Apache derby pool empty. Unable to fetch a connection in 30 seconds

由 妖精的绣舞 提交于 2019-12-08 00:55:55
问题 After some time of running I'm getting this error. Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.orm.jpa.JpaSystemException: Unable to acquire JDBC Connection; nested exception is org.hibernate.exception.GenericJDBCException: Unable to acquire JDBC Connection] with root cause org.apache.tomcat.jdbc.pool.PoolExhaustedException: [http-nio-8081-exec-5] Timeout: Pool empty. Unable to

Deployed war to tomcat can't throws java.lang.NoClassDefFoundError: javax/persistence/PersistenceException

由 为君一笑 提交于 2019-12-07 21:58:11
问题 I'm new to this forum and also new to JPA / EJB. I'm trying to deploy a .war file containing a small application to a tomcat server. The application is using JTA to communicate with the Derby db. When I run and deploy the application from and eclipse top the tomcat server running in eclipse, everything works perfect, but when I export a .war file and try to browse the application it throws an java.lang.ClassNotFoundException: javax.persistence.PersistenceException. My persistence file looks

Hibernate/JPA + Derby - SELECT statement has too many items in GROUP BY, ORDER BY or select list

由 狂风中的少年 提交于 2019-12-07 20:45:01
问题 I use Hibernate for JPA DB mapping with Derby DB. For a complex object structure I am getting "org.apache.derby.client.am.SqlException: SELECT statement has too many items in GROUP BY, ORDER BY or select list": org.apache.derby.client.am.SqlException: SELECT statement has too many items in GROUP BY, ORDER BY or select list. org.apache.derby.client.am.Statement.completeSqlca(Unknown Source) org.apache.derby.client.net.NetStatementReply.parsePrepareError(Unknown Source) org.apache.derby.client

IF EXISTS not recognized in Derby

由 ﹥＞﹥吖頭↗ 提交于 2019-12-07 20:13:10
问题 DROP TABLE IF EXISTS Pose ; results in the error Error code -1, SQL state 42X01: Syntax error: Encountered "EXISTS" at line 1, column 15. I'm running this from inside NetBeans 7.3 using the default Derby sample db. 回答1: Derby does not currently support IF EXISTS 回答2: Are you trying to create a table? If yes, this is what you should do: public void createTables() throws SQLException { Statement statement = getConnection().createStatement(); System.out.println("Checking database for table");

ClassNotFoundException: org.apache.derby.jdbc.EmbeddedDriver when trying to use JPA with Derby

由 亡梦爱人 提交于 2019-12-07 15:31:16
问题 A related query I asked: How to configure & package a simple Java app to use JPA I have a simple Derby database which I can connect to via EJBs hosted in WebLogic. Now I would like to connect to it from a command line Java app using JPA. So far this Java code + persistence.xml file is throwing the error below. What am I doing wrong? My directory layout: C:. │ Registrar.class │ Registrar.java │ TxnClient.class │ TxnClient.java │ └───META-INF persistence.xml Standalone client: import javax

how can change derby to READ/WRITE mode

由 隐身守侯 提交于 2019-12-07 10:27:16
问题 I have a Derby database that is giving me a read-only error. The database was working fine, up until last week when disk ran out of space: Caused by: java.io.IOException: No space left on device at java.io.RandomAccessFile.writeBytes0(Native Method) at java.io.RandomAccessFile.writeBytes(RandomAccessFile.java:520) at java.io.RandomAccessFile.write(RandomAccessFile.java:550) at org.apache.derby.impl.store.raw.log.LogAccessFile.writeToLog(Unknown Source) at org.apache.derby.impl.store.raw.log

Derby classpath can't connect to database

由 孤者浪人 提交于 2019-12-07 06:44:56
问题 I just installed derby and I followed the instructions from here the exact same way it told me to but replacing the paths with my paths. But for some reason why i try to create a connection to connect to create a Database and run my sql scripts to create the tables and populate them it gives me a few errors firstly is this one ERROR 08001: No suitable driver found for jdbc:derby:SuperMarket;create=true Then when my sql scripts run I get this error IJ ERROR: Unable to establish connection I

Hibernate Creating Unwanted Mapping Tables

由 ℡╲_俬逩灬. 提交于 2019-12-07 05:12:26
I am creating a schema. My schema is as follows @Entity @Table(name = "PROMOTION") public class Promotion { @Id @Column (name = "promotion_id") private String promotionId; @JoinColumn(name = "seller_id") private List<Seller> sellerList; }; @Entity @Table(name = "SELLER") public class Seller { @Id @Column (name = "seller_id") private String sellerId; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "promotion_id") private Promotion promotion; @ManyToMany(fetch = FetchType.LAZY) @JoinColumn(name = "seller_id", referencedColumnName = "seller_id") private List<SellerPromotion> sellerList; };

How to browse a derby memory database with Eclipse Datasource Explorer?

由 送分小仙女□ 提交于 2019-12-07 03:20:52
问题 For unit testing I use a derby in-memory database. Is there any chance to connect to this database using a tool like Eclipse Datasource Explorer when the test is running? I googled a lot and sometimes I found something like: Connection-URL: jdbc:derby://localhost:1527/memory/mydb... But it did not work for me. It says that 1527 is the default port. Is it possible at all to connect to a derby memory database with a tool like eclipse explorer? Does the database open a connection-port to connect
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