ddl

I've created my model classes with JPA 2.0 annotations. At runtime, I will use EclipseLink 2.2.0, but I've been careful to use only pure JPA annotations in my model classes. Now, how do I generate the schema DDL for the database ? I want to use the EclipseLink API to generate the DDL from the classes, but not at runtime. Instead, I want a Java class to run on the command line and which outputs the DDL. What this guy did for Hibernate , I want for EclipseLink. I'd also settle for an Ant task or some plugin for Maven. Also, I chose to name my file jpa.xml instead of persistence.xml ; bonus

I have a table defined like this CREATE TABLE [dbo].[ObjectRelationClauses] ( [Id] INT NOT NULL PRIMARY KEY IDENTITY, [RelationId] INT NOT NULL, [OperatorType] NVARCHAR(3) NOT NULL, [LocalPropertyId] INT NOT NULL, [ForeignPropertyId] INT NULL, [ForeignValue] VARCHAR(255) NULL, [ParentClauseId] INT NULL ) I need to be able to raise an error if the value of both ForeignPropertyId and ForeignValue columns both null , otherwise I want to perform the operation. Here is what I tried CREATE TRIGGER [dbo].[Trigger_ObjectRelationClauses] ON [dbo].[ObjectRelationClauses] FOR INSERT, UPDATE AS BEGIN SET

触发器简介： 触发器是一种特殊的存储过程，它的执行不是由程序调用，也不是手动执行，而是由事件来触发。触发器是当对某一个表进行操作。例如：update、insert、delete这些操作的时候，系统会自动调用执行该表上对应的触发器。 触发器分类： 1、DML（ 数据操纵语言 Data Manipulation Language）触发器：是指触发器在数据库中发生 DML 事件时将启用。DML事件是指在表或视图中对数据进行的 insert、update、delete 操作的语句。 2、DDL（数据定义语言 Data Definition Language）触发器：是指当服务器或数据库中发生 DDL 事件时将启用。DDL事件是指在表或索引中的 create、alter、drop 操作语句。 3、登陆触发器：是指当用户登录 SQL SERVER 实例建立会话时触发。如果身份验证失败，登录触发器不会触发。 其中 DML 触发器比较常用，根据 DML 触发器触发的方式不同又分为以下两种情况： after 触发器（之后触发）：其中 after 触发器要求只有执行 insert、update、delete 某一操作之后触发器才会被触发，且只能定义在表上。 instead of 触发器 （之前触发）：instead of 触发器并不执行其定义的操作（insert、update、delete

2.1创建ogg操作系统用户： useradd -u 1003 -g oinstall -G dba ogg passwd ogg --源端开启归档，若归档路径不设置则pump进程启动报错 su - oracle mkdir archivelog sqlplus / as sysdba alter system set log_archive_dest_1='location=/home/oracle/archivelog'; shutdown immediate; startup mount; alter database archivelog; alter database open; alter system switch logfile; / archive log list; exit 2.2修改ogg操作系统用户环境变量,并链接oracle用户环境变量，修改实例名为jvm vi /home/ogg/.bash_profile export ORACLE_SID=orcl export ORACLE_BASE=/home/oracle/app/oracle export ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_1 export OGG_HOME=/ogg export PATH=$ORACLE

I've got a program that periodically updates its database schema. Sometimes, one of the DDL statements might fail and if it does, I want to roll back all the changes. I wrap the update in a transaction like so: BEGIN TRAN; CREATE TABLE A (PKey int NOT NULL IDENTITY, NewFieldKey int NULL, CONSTRAINT PK_A PRIMARY KEY (PKey)); CREATE INDEX A_2 ON A (NewFieldKey); CREATE TABLE B (PKey int NOT NULL IDENTITY, CONSTRAINT PK_B PRIMARY KEY (PKey)); ALTER TABLE A ADD CONSTRAINT FK_B_A FOREIGN KEY (NewFieldKey) REFERENCES B (PKey); COMMIT TRAN; As we're executing, if one of the statements fail, I do a

I have been playing about with FluentNhibernate as part of the S#arp Architecture. Below is an example mapping. public class EventBaseMap : ClassMap<EventBase> { public EventBaseMap() { WithTable("Event_Header"); //NotLazyLoaded(); Id(x => x.Id).WithUnsavedValue(-1).GeneratedBy.Native(); Map(x => x.Name).WithLengthOf(50).Not.Nullable(); Map(x => x.Description).WithLengthOf(255); Map(x => x.Rating); Map(x => x.Price); Map(x => x.PhoneNumber).WithLengthOf(20).Not.Nullable(); Map(x => x.EmailAddress); Map(x => x.Website); Map(x => x.State).Not.Nullable().CustomSqlTypeIs("INT"); Component(x => x