Java JPA hibernate中一对一关系中的外键约束子级
我将spring boot与JPA一起使用,我有一个实体,其中包含与下面描述的子实体相同的实体how nextCondition from type RuleCondition:Java JPA hibernate中一对一关系中的外键约束子级,java,spring,hibernate,jpa,spring-boot,Java,Spring,Hibernate,Jpa,Spring Boot,我将spring boot与JPA一起使用,我有一个实体,其中包含与下面描述的子实体相同的实体how nextCondition from type RuleCondition: @Entity @Table(name = "EDITOR_REGRA_CONDICAO") public class RuleCondition implements Serializable { @GenericGenerator( name = "ruleConditionSequenceGe
@Entity @Table(name = "EDITOR_REGRA_CONDICAO")
public class RuleCondition implements Serializable {
@GenericGenerator(
name = "ruleConditionSequenceGenerator",
strategy = "org.hibernate.id.enhanced.SequenceStyleGenerator",
parameters = {
@Parameter(name = "sequence_name", value = "SEQ_RULE_CONDITION"),
@Parameter(name = "initial_value", value = "1"),
@Parameter(name = "increment_size", value = "1")
})
@GeneratedValue(generator = "ruleConditionSequenceGenerator")
@Id
private Long id;
@OneToOne(fetch = FetchType.LAZY, optional = false)
@JoinColumn(name = "field", nullable = false)
private Field field;
@Column
private String value;
@OneToOne(fetch = FetchType.EAGER, optional = false)
@JoinColumn(name = "operator", nullable = false)
private RuleOperator ruleOperator;
@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "connector")
private RuleConnector ruleConnector;
@OneToOne(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER)
@JoinColumn(name = "next_condition")
private RuleCondition nextCondition;
这是规则条件控制器
@RequestMapping(value = "/rule", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.APPLICATION_JSON_VALUE)
public Rule newRule(@RequestParam("layout") Long layoutId, @RequestBody Rule rule) {
return ruleManager.newRule(rule,layoutId);
}
完成此操作的是负责管理规则条件操作的类:
public Rule newRule(@Nonnull final Rule rule, @Nonnull final Long layoutId) {
RuleType ruleType = ruleService.getRuleType(rule.getRuleType().getIdentifier());
saveConditions(rule.getCondition());
rule.setRuleType(ruleType);
Rule savedRule = ruleService.saveRule(rule);
layoutManager.addRule(savedRule, layoutId);
return savedRule;
}
@Transactional(propagation = Propagation.REQUIRES_NEW)
private void saveConditions(RuleCondition ruleCondition) {
RuleConnector ruleConnector;
RuleOperator ruleOperator;
if (ruleCondition == null) {
return;
}
if (ruleCondition.getNextCondition() != null) {
saveConditions(ruleCondition.getNextCondition());
}
if (ruleCondition.getRuleConnector() != null) {
ruleConnector = ruleService.getRuleConnector(ruleCondition.getRuleConnector().getIdentifier());
ruleCondition.setRuleConnector(ruleConnector);
}
if (ruleCondition.getRuleOperator() != null) {
ruleOperator = ruleService.getRuleOperator(ruleCondition.getRuleOperator().getIdentifier());
ruleCondition.setRuleOperator(ruleOperator);
}
if (ruleCondition.getField() != null) {
Field field = fieldManager.getFieldByName(ruleCondition.getField().getName());
ruleCondition.setField(field);
}
ruleService.saveCondition(ruleCondition);
}
在持久化数据时,我遇到以下错误:
唯一索引或主键冲突:“UK_QG4N8FT2CPEX15N36TM2SRXPN_索引_1 ON PUBLIC.EDITOR_REGRA_condico(字段)值(1,1)”;SQL语句:
在编辑器中插入条件(字段、下一个条件、连接器、运算符、值、id)值(?,,,,,,?,,?)[23505-193]
从上下文中,似乎插入的
RuleCondition
链接到了一个字段
,该字段已经链接了一个RuleCondition
在一对一
关系中,这是不允许的(如名称所示,此类关系仅限于单个关系)
也要解决这个问题
对字段使用多对一
关系:
@ManyToOne(fetch = FetchType.LAZY, optional = false)
@JoinColumn(name = "field", nullable = false)
private Field field;
或者确保在每次保存之前,没有指向已链接RuleCondition的字段的链接。您插入的字段似乎带有已存在的字段ID。。有了唯一的约束,你就得到了错误,有没有可能在出现错误的时候,你已经有了相同字段的RuleCondition?由于这是一对一的关系,您不能拥有多个关系。谢谢@Ovidu Dolha,我将我的对象的关系修改为多个关系