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EssentialsHSQLPlatformWithNativeSequence.java
Package: petclinic.rar　[view]
Upload User: dezhong
Upload Date: 2022-08-10
Package Size: 167k
Code Size: 1k
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Java Develop

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Java

EssentialsHSQLPlatformWithNativeSequence.java：Code Content
  1. package org.springframework.samples.petclinic.toplink;
  3. import java.io.IOException;
  4. import java.io.Writer;
  6. import oracle.toplink.essentials.exceptions.ValidationException;
  7. import oracle.toplink.essentials.platform.database.HSQLPlatform;
  8. import oracle.toplink.essentials.queryframework.ValueReadQuery;
  10. /**
  11.  * Subclass of the TopLink Essentials default HSQLPlatform class, using native
  12.  * HSQLDB identity columns for id generation.
  13.  *
  14.  * <p>Necessary for PetClinic's default data model, which relies on identity
  15.  * columns: this is uniformly used across all persistence layer implementations
  16.  * (JDBC, Hibernate, and JPA).
  17.  *
  18.  * @author Juergen Hoeller
  19.  * @author <a href="mailto:james.x.clark@oracle.com">James Clark</a>
  20.  * @since 1.2
  21.  */
  22. public class EssentialsHSQLPlatformWithNativeSequence extends HSQLPlatform {
  24. private static final long serialVersionUID = -55658009691346735L;
  27. public EssentialsHSQLPlatformWithNativeSequence() {
  28. // setUsesNativeSequencing(true);
  29. }
  31. public boolean supportsNativeSequenceNumbers() {
  32. return true;
  33. }
  35. public boolean shouldNativeSequenceAcquireValueAfterInsert() {
  36. return true;
  37. }
  39. public ValueReadQuery buildSelectQueryForNativeSequence() {
  40. return new ValueReadQuery("CALL IDENTITY()");
  41. }
  43. public void printFieldIdentityClause(Writer writer) throws ValidationException {
  44. try {
  45. writer.write(" IDENTITY");
  46. }
  47. catch (IOException ex) {
  48. throw ValidationException.fileError(ex);
  49. }
  50. }
  52. }