Play Framework：使用 H2 内存数据库获取序列 nextval 时出错

Question

正如标题所示，我在使用内存中带有 H2 的 FakeApplication 运行 Play 2.0.1 测试时遇到错误。

我设置了一个基本的单元测试：

public class ModelTest {
    @Test
    public void checkThatIndustriesExist() {
        running(fakeApplication(inMemoryDatabase()), new Runnable() {
            public void run() {
                Industry industry = new Industry();
                industry.name = "Some name";
                industry.shortname = "some-name";
                industry.save();
                assertThat(Industry.find.all()).hasSize(1);
            }
        });
    }

这会产生以下异常：

[info] test.ModelTest
[error] Test test.ModelTest.checkThatIndustriesExist failed: Error getting sequence nextval
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.getMoreIds(SequenceIdGenerator.java:213)
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.loadMoreIds(SequenceIdGenerator.java:163)
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.nextId(SequenceIdGenerator.java:118)
[error]     at com.avaje.ebeaninternal.server.deploy.BeanDescriptor.nextId(BeanDescriptor.java:1218)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.setIdGenValue(DefaultPersister.java:1304)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.insert(DefaultPersister.java:403)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.saveEnhanced(DefaultPersister.java:345)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.saveRecurse(DefaultPersister.java:315)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.save(DefaultPersister.java:282)
[error]     at com.avaje.ebeaninternal.server.core.DefaultServer.save(DefaultServer.java:1577)
[error]     at com.avaje.ebeaninternal.server.core.DefaultServer.save(DefaultServer.java:1567)
[error]     at com.avaje.ebean.Ebean.save(Ebean.java:538)
[error]     at play.db.ebean.Model.save(Model.java:76)
[error]     at test.ModelTest$1.run(ModelTest.java:24)
[error]     at play.test.Helpers.running(Helpers.java:277)
[error]     at test.ModelTest.checkThatIndustriesExist(ModelTest.java:21)
[error]     ...
[error] Caused by: org.h2.jdbc.JdbcSQLException: Syntax Fehler in SQL Befehl "SELECT INDUSTRY_SEQ.NEXTVAL UNION[*] SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL "; erwartet "identifier"
[error] Syntax error in SQL statement "SELECT INDUSTRY_SEQ.NEXTVAL UNION[*] SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL "; expected "identifier"; SQL statement:
[error] select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval [42001-158]
[error]     at org.h2.message.DbException.getJdbcSQLException(DbException.java:329)
[error]     at org.h2.message.DbException.get(DbException.java:169)
[error]     at org.h2.message.DbException.getSyntaxError(DbException.java:194)
[error]     at org.h2.command.Parser.readColumnIdentifier(Parser.java:2777)
[error]     at org.h2.command.Parser.readTermObjectDot(Parser.java:2336)
[error]     at org.h2.command.Parser.readTerm(Parser.java:2453)
[error]     at org.h2.command.Parser.readFactor(Parser.java:2035)
[error]     at org.h2.command.Parser.readSum(Parser.java:2022)
[error]     at org.h2.command.Parser.readConcat(Parser.java:1995)
[error]     at org.h2.command.Parser.readCondition(Parser.java:1860)
[error]     at org.h2.command.Parser.readAnd(Parser.java:1841)
[error]     at org.h2.command.Parser.readExpression(Parser.java:1833)
[error]     at org.h2.command.Parser.parseSelectSimpleSelectPart(Parser.java:1746)
[error]     at org.h2.command.Parser.parseSelectSimple(Parser.java:1778)
[error]     at org.h2.command.Parser.parseSelectSub(Parser.java:1673)
[error]     at org.h2.command.Parser.parseSelectUnion(Parser.java:1518)
[error]     at org.h2.command.Parser.parseSelect(Parser.java:1506)
[error]     at org.h2.command.Parser.parsePrepared(Parser.java:405)
[error]     at org.h2.command.Parser.parse(Parser.java:279)
[error]     at org.h2.command.Parser.parse(Parser.java:251)
[error]     at org.h2.command.Parser.prepareCommand(Parser.java:217)
[error]     at org.h2.engine.Session.prepareLocal(Session.java:415)
[error]     at org.h2.engine.Session.prepareCommand(Session.java:364)
[error]     at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1119)
[error]     at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:71)
[error]     at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:267)
[error]     at com.jolbox.bonecp.ConnectionHandle.prepareStatement(ConnectionHandle.java:820)
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.getMoreIds(SequenceIdGenerator.java:193)
[error]     ... 80 more

我的模型如下所示：

@Entity
@Table(name = "industry")
public class Industry extends Model {
    @Id public Long id;
    public String name;
    public String shortname;

    // called in the view to trigger lazy-loading
    public String getName() {
        return name;
    }

    public static Finder<Long, Industry> find = new Finder<Long, Industry>(Long.class, Industry.class);
}

...最后是我最初进化的相关部分：

create table industry (
    id        bigint not null,
    name      varchar(255),
    shortname varchar(255),
    constraint pk_industry primary key (id)
}

create sequence industry_seq start with 1000;

在我的 PostgreSQL 数据库上运行一切正常，从我的角度来看，代码与 Play2.0 Computer Database Sample 没有任何不同。

我很乐意提供任何帮助 - 谢谢！

问候， 亚历克斯

Answer 1

问题已解决，方法如下：

• 在调用 inMemoryDatabase() 之前，我提供了自己的配置
• 数据库的名称是“test”，而不是调用 inMemoryDatabase() 时使用的“default”
• 因为我没有在 conf/evolutions/test 中保留进化，但只在 conf/evolutions/default 中没有创建架构
• 我不得不清理应用程序，因为在更改为 inMemoryDatabase() 后未应用“默认”配置

Answer 2

仅使用您的代码和一个我无法重现的新 Play 2.0.1 项目。这是我的代码和配置 with 导入。由于类不是问题，我的猜测是您使用 evolutionplugin=disabled 关闭了进化，并且您的数据库进化永远不会被应用，因此您的异常中出现了“预期的标识符”。

如上所述，

编辑禁用数据库演变会产生与您遇到的相同的异常，请参见底部。

Edit-2this blogpost 的作者描述了如何手动应用进化。看起来不太性感，但我应该每个项目只需要实现一次该基类。如果有人知道框架内更优雅的东西，请告诉。

Ebean Evolution（自动生成）：

create table industry (   
  id              bigint not null,  
  name            varchar(255),   shortname                
  varchar(255),   constraint pk_industry primary key (id)) ;
  create sequence industry_seq;
;

我的模特行业

package models;

import play.db.ebean.Model;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "industry")
public class Industry extends Model {
    @Id
    public Long id;
    public String name;
    public String shortname;

    // called in the view to trigger lazy-loading
    public String getName() {
        return name;
    }

    public static Finder<Long, Industry> find 
           = new Model.Finder<Long, Industry>(Long.class, Industry.class);
}

我的单元测试

package models;

import org.junit.Test;

import java.util.List;
import java.util.Map;

import static org.fest.assertions.Assertions.assertThat;
import static play.test.Helpers.fakeApplication;
import static play.test.Helpers.inMemoryDatabase;
import static play.test.Helpers.running;

public class ModelTest {

    @Test
    public void checkThatIndustriesExist() {
        running(fakeApplication(inMemoryDatabase()), new Runnable() {
            public void run() {
                Industry industry = new Industry();
                industry.name = "Some name";
                industry.shortname = "some-name";
                industry.save();
                assertThat(Industry.find.all()).hasSize(1);
            }
        });
    }

}

我的 appication.conf

application.secret="8aXG0?h`kxccxs6JM?WdB@<v`kwouvQr2<y5Y>9jk3XU1yHV`Yr>18xRKHv8PTdv"
application.langs="en"
ebean.default="models.*"
logger.root=ERROR
logger.play=INFO
logger.application=DEBUG

测试输出：

[stackoverflow-10869508] $ test
[info] Updating {file:/Users/martin/workspace/stackoverflow-10869508/}stackoverflow-10869508...
[info] Done updating.                                                                  
[info] Compiling 4 Scala sources and 3 Java sources to /Users/martin/workspace/stackoverflow-10869508/target/scala-2.9.1/classes...
[info] Compiling 1 Java source to /Users/martin/workspace/stackoverflow-10869508/target/scala-2.9.1/test-classes...
[info] models.ModelTest
[info] + models.ModelTest.checkThatIndustriesExist
[info] 
[info] 
[info] Total for test models.ModelTest
[info] Finished in 2.289 seconds
[info] 1 tests, 0 failures, 0 errors
[info] Passed: : Total 1, Failed 0, Errors 0, Passed 1, Skipped 0

测试输出禁用进化：

[stackoverflow-10869508] $ test
[info] Compiling 1 Java source to /Users/martin/workspace/stackoverflow-10869508/target/scala-2.9.1/test-classes...
[info] models.ModelTest
[error] Test models.ModelTest.checkThatIndustriesExist failed: Error getting sequence nextval
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.getMoreIds(SequenceIdGenerator.java:213)
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.loadMoreIds(SequenceIdGenerator.java:163)
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.nextId(SequenceIdGenerator.java:118)
[error]     at com.avaje.ebeaninternal.server.deploy.BeanDescriptor.nextId(BeanDescriptor.java:1218)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.setIdGenValue(DefaultPersister.java:1304)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.insert(DefaultPersister.java:403)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.saveEnhanced(DefaultPersister.java:345)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.saveRecurse(DefaultPersister.java:315)
[error]     at com.avaje.ebeaninternal.server.persist.DefaultPersister.save(DefaultPersister.java:282)
[error]     at com.avaje.ebeaninternal.server.core.DefaultServer.save(DefaultServer.java:1577)
[error]     at com.avaje.ebeaninternal.server.core.DefaultServer.save(DefaultServer.java:1567)
[error]     at com.avaje.ebean.Ebean.save(Ebean.java:538)
[error]     at play.db.ebean.Model.save(Model.java:76)
[error]     at models.ModelTest$1.run(ModelTest.java:22)
[error]     at play.test.Helpers.running(Helpers.java:277)
[error]     at models.ModelTest.checkThatIndustriesExist(ModelTest.java:17)
[error]     ...
[error] Caused by: org.h2.jdbc.JdbcSQLException: Syntax Fehler in SQL Befehl "SELECT INDUSTRY_SEQ.NEXTVAL UNION[*] SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL "; erwartet "identifier"
[error] Syntax error in SQL statement "SELECT INDUSTRY_SEQ.NEXTVAL UNION[*] SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL UNION SELECT INDUSTRY_SEQ.NEXTVAL "; expected "identifier"; SQL statement:
[error] select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval union select industry_seq.nextval [42001-158]
[error]     at org.h2.message.DbException.getJdbcSQLException(DbException.java:329)
[error]     at org.h2.message.DbException.get(DbException.java:169)
[error]     at org.h2.message.DbException.getSyntaxError(DbException.java:194)
[error]     at org.h2.command.Parser.readColumnIdentifier(Parser.java:2777)
[error]     at org.h2.command.Parser.readTermObjectDot(Parser.java:2336)
[error]     at org.h2.command.Parser.readTerm(Parser.java:2453)
[error]     at org.h2.command.Parser.readFactor(Parser.java:2035)
[error]     at org.h2.command.Parser.readSum(Parser.java:2022)
[error]     at org.h2.command.Parser.readConcat(Parser.java:1995)
[error]     at org.h2.command.Parser.readCondition(Parser.java:1860)
[error]     at org.h2.command.Parser.readAnd(Parser.java:1841)
[error]     at org.h2.command.Parser.readExpression(Parser.java:1833)
[error]     at org.h2.command.Parser.parseSelectSimpleSelectPart(Parser.java:1746)
[error]     at org.h2.command.Parser.parseSelectSimple(Parser.java:1778)
[error]     at org.h2.command.Parser.parseSelectSub(Parser.java:1673)
[error]     at org.h2.command.Parser.parseSelectUnion(Parser.java:1518)
[error]     at org.h2.command.Parser.parseSelect(Parser.java:1506)
[error]     at org.h2.command.Parser.parsePrepared(Parser.java:405)
[error]     at org.h2.command.Parser.parse(Parser.java:279)
[error]     at org.h2.command.Parser.parse(Parser.java:251)
[error]     at org.h2.command.Parser.prepareCommand(Parser.java:217)
[error]     at org.h2.engine.Session.prepareLocal(Session.java:415)
[error]     at org.h2.engine.Session.prepareCommand(Session.java:364)
[error]     at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1119)
[error]     at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:71)
[error]     at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:267)
[error]     at com.jolbox.bonecp.ConnectionHandle.prepareStatement(ConnectionHandle.java:820)
[error]     at com.avaje.ebean.config.dbplatform.SequenceIdGenerator.getMoreIds(SequenceIdGenerator.java:193)
[error]     ... 80 more
[info] x models.ModelTest.checkThatIndustriesExist
[info] 
[info] 
[info] Total for test models.ModelTest
[info] Finished in 2.028 seconds
[info] 1 tests, 1 failures, 0 errors
[error] Failed: : Total 1, Failed 1, Errors 0, Passed 0, Skipped 0
[error] Failed tests:
[error]     models.ModelTest
[error] {file:/Users/martin/workspace/stackoverflow-10869508/}stackoverflow-10869508/test:test: Tests unsuccessful
[error] Total time: 3 s, completed 03.06.2012 18:34:39

Answer 3

我的 id 看起来像这样，但我没有收到那个错误...

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Long id;