好,我使用的是JPA春天引導和我有一個包含下面如何nextCondition從類型RuleCondition描述相同的實體作爲孩子的實體:外鍵約束孩子在一,在JPA的一個關係冬眠
@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;
這是規則條件控制器
@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);
}
和完成,這是該類負責管理規則的條件下操作:
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);
}
當我堅持的數據,我遇到了以下錯誤:
Unique index or primary key violation: "UK_QG4N8FT2CPEX15N36TM2SRXPN_INDEX_1 ON PUBLIC.EDITOR_REGRA_CONDICAO(FIELD) VALUES (1, 1)"; SQL statement: insert into editor_regra_condicao (field, next_condition, connector, operator, value, id) values (?, ?, ?, ?, ?, ?) [23505-193]
它似乎是你插入一個fieldid已經存在..並有獨特的約束seet你會得到錯誤 –
是否有可能在錯誤的位置你已經有一個RuleCondition爲同一個字段?由於這是一對一的關係,因此您不允許有多個關係。 –