我正在开发一个实现Hibernate的JEE开发。我过去使用过Hibernate，但从来没有设置它并进行配置。设置这个应用程序的开发人员现在已经不复存在了，那些离开的人真的不知道如何使用它（主要是）。
我们遇到的最大问题是一个模块在表上创建一个新条目。在同一进程中，后续模块想要在具有第一个表的外键的表上创建一个条目，特别是第一个模块刚刚创建的条目的键。那失败了。 Hibernate说第一把钥匙不存在。但是，如果我在测试结束后检查数据库，那么条目就在那里。
我进入调试并在尝试创建第二个条目之前停止了该过程。如果我在那时检查数据库，那么第一个条目肯定不在数据库上。自从Hibernate缓存更新以来，我并不感到惊讶。它只是按照自己的时间表进行物理更新。但我无法理解的是，为什么它说第一个条目不存在。造成这种情况的原因是什么？
我不知道该给你什么设置来展示我们的设置，所以我会提供一些东西，希望能得到一些反馈。
我们正在使用Wildfly 10，Hibernate 5.1.0.Final和Postgresql 9.4.1208.jre7。
以下是WildFly standalone.xml中的数据源设置
<subsystem xmlns="urn:jboss:domain:datasources:4.0">
<datasources>
<xa-datasource jndi-name="java:jboss/datasources/CMA_DS" pool-name="java:jboss/datasources/CMA_DS" enabled="true">
<xa-datasource-property name="DatabaseName">
cma
</xa-datasource-property>
<xa-datasource-property name="ServerName">
localhost
</xa-datasource-property>
<xa-datasource-property name="PortNumber">
5432
</xa-datasource-property>
<xa-datasource-property name="User">
user
</xa-datasource-property>
<xa-datasource-property name="Password">
psw
</xa-datasource-property>
<xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class>
<driver>postgres</driver>
<xa-pool>
<min-pool-size>20</min-pool-size>
<max-pool-size>50</max-pool-size>
<prefill>true</prefill>
</xa-pool>
</xa-datasource>
<drivers>
<driver name="postgres" module="org.postgresql">
<xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class>
</driver>
</drivers>
</datasources>
</subsystem>
Persistence.xml包含
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="CMA_DS">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>java:jboss/datasources/CMA_DS</jta-data-source>
<properties>
<property name="hibernate.dialect" value="com.cma.config.FixedPostgreSQL94Dialect" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.cache.default_cache_concurrency_strategy" value="nonstrict-read-write" />
<property name="hibernate.max_fetch_depth" value="1" />
<property name="hibernate.connection.useUnicode" value="true" />
<property name="hibernate.connection.characterEncoding" value="UTF-8" />
<property name="hibernate.generate_statistics" value="false" />
<property name="hibernate.c3p0.min_size" value="15" />
<property name="hibernate.c3p0.max_size" value="50" />
<property name="hibernate.c3p0.timeout" value="300" />
<property name="hibernate.c3p0.max_statements" value="50" />
<property name="hibernate.c3p0.idle_test_period" value="3000" />
</properties>
</persistence-unit>
这是两个表的SQL：
CREATE TABLE zones
(
id numeric NOT NULL, -- Generated id field
description character varying(250),
lat_degree numeric,
lat_minute numeric,
lat_hemisphere character varying(1),
long_degree numeric,
long_minute numeric,
long_hemisphere character varying(1),
national_loc_id character varying(61),
global_loc_num character varying(13),
zone_name character varying(50) NOT NULL,
country_code character(3),
party_organization_id character varying(15),
owner_nation character(3),
local_owner boolean,
CONSTRAINT pk_zones PRIMARY KEY (id),
CONSTRAINT zones_global_loc_num_key UNIQUE (global_loc_num),
CONSTRAINT "zones_national_loc-id_key" UNIQUE (national_loc_id, country_code),
CONSTRAINT zones_zone_name_key UNIQUE (zone_name, owner_nation)
);
CREATE TABLE party_id_tracking
(
id numeric NOT NULL,
zone_id numeric,
endpoint_id numeric,
notified_date timestamp without time zone NOT NULL DEFAULT now(),
CONSTRAINT pk_party_id_tracking PRIMARY KEY (id),
CONSTRAINT party_id_tracking_endpoint_fk FOREIGN KEY (endpoint_id)
REFERENCES routing_endpoint (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT party_id_tracking_zone_fk FOREIGN KEY (zone_id)
REFERENCES zones (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
);
区域表的实体：
@Entity
@Table(name = "zones")
@Access(AccessType.FIELD)
public class Zone extends BaseEntity implements Serializable {
private static final long serialVersionUID = -5828384364074883963L;
@Column(name = "zone_name")
private String zoneName;
@Column(name = "description")
private String description;
@Column(name = "lat_degree")
private Integer latDegree;
@Column(name = "lat_minute")
private Float latMinute;
@Column(name = "lat_hemisphere")
private String latHemisphere;
@Column(name = "long_degree")
private Integer longDegree;
@Column(name = "long_minute")
private Float longMinute;
@Column(name = "long_hemisphere")
private String longHemisphere;
@Column(name = "national_loc_id")
private String nationalLocID;
@Column(name = "global_loc_num")
private String globalLocNum;
@Column(name = "country_code")
private String countryCode;
@Column(name = "owner_nation")
private String ownerNation;
@Column(name = "party_organization_id")
private String partyOrganizationId;
@Column(name = "local_owner")
private Boolean localOwner;
public Zone() {
super();
}
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getLatDegree() {
return this.latDegree;
}
public void setLatDegree(Integer latDegree) {
this.latDegree = latDegree;
}
public String getLatHemisphere() {
return this.latHemisphere;
}
public void setLatHemisphere(String latHemisphere) {
this.latHemisphere = latHemisphere;
}
public Integer getLongDegree() {
return this.longDegree;
}
public void setLongDegree(Integer longDegree) {
this.longDegree = longDegree;
}
public String getLongHemisphere() {
return this.longHemisphere;
}
public void setLongHemisphere(String longHemisphere) {
this.longHemisphere = longHemisphere;
}
public String getNationalLocID() {
return this.nationalLocID;
}
public void setNationalLocID(String nationalLocID) {
this.nationalLocID = nationalLocID;
}
public String getGlobalLocNum() {
return this.globalLocNum;
}
public void setGlobalLocNum(String globalLocNum) {
this.globalLocNum = globalLocNum;
}
public Float getLatMinute() {
return this.latMinute;
}
public void setLatMinute(Float latMinute) {
this.latMinute = latMinute;
}
public Float getLongMinute() {
return this.longMinute;
}
public void setLongMinute(Float longMinute) {
this.longMinute = longMinute;
}
public String getZoneName() {
return this.zoneName;
}
public void setZoneName(String zoneName) {
this.zoneName = zoneName;
}
public String getCountryCode() {
return this.countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
public String getOwnerNation() {
return this.ownerNation;
}
public void setOwnerNation(String ownerNation) {
this.ownerNation = ownerNation;
}
public String getPartyOrganizationId() {
return this.partyOrganizationId;
}
public void setPartyOrganizationId(String partyOrganizationId) {
this.partyOrganizationId = partyOrganizationId;
}
public Boolean getLocalOwner() {
return this.localOwner;
}
public void setLocalOwner(Boolean localOwner) {
this.localOwner = localOwner;
}
}
跟踪表：
@Entity
@Table(name = "party_id_tracking")
@Access(AccessType.FIELD)
public class PartyIdTracking extends BaseEntity {
@Column(name = "notified_date")
@Temporal(TemporalType.TIMESTAMP)
private Date notifiedDate;
@Column(name = "endpoint_id")
private Long endpointId;
@Column(name = "zone_id")
private Long zoneId;
public Date getNotifiedDate() {
return this.notifiedDate;
}
public void setNotifiedDate(Date notifiedDate) {
this.notifiedDate = notifiedDate;
}
public Long getEndpointId() {
return this.endpointId;
}
public void setEndpointId(Long endpointId) {
this.endpointId = endpointId;
}
public Long getZoneId() {
return this.zoneId;
}
public void setZoneId(Long zoneId) {
this.zoneId = zoneId;
}
}
我们在应用程序中遇到了类似的问题。在表中创建一个条目，我们立即需要插入依赖于第一个条目的其他条目。我们一直在失败，因为它认为第一个条目不存在。
我们尝试过使用同花顺。但这并没有帮助。
我们做什么？
答案 0 :(得分：0)
刚刚像这样修改了你的实体表。
@Entity
@Table(name = "zones")
@Access(AccessType.FIELD)
public class Zone extends BaseEntity implements Serializable {
private static final long serialVersionUID = -5828384364074883963L;
@OneToOne(fetch = FetchType.LAZY, mappedBy = "zones", cascade = CascadeType.ALL)
private PartyIdTracking partyIdTracking;
@Column(name = "zone_name")
private String zoneName;
@Column(name = "description")
private String description;
@Column(name = "lat_degree")
private Integer latDegree;
@Column(name = "lat_minute")
private Float latMinute;
@Column(name = "lat_hemisphere")
private String latHemisphere;
@Column(name = "long_degree")
private Integer longDegree;
@Column(name = "long_minute")
private Float longMinute;
@Column(name = "long_hemisphere")
private String longHemisphere;
@Column(name = "national_loc_id")
private String nationalLocID;
@Column(name = "global_loc_num")
private String globalLocNum;
@Column(name = "country_code")
private String countryCode;
@Column(name = "owner_nation")
private String ownerNation;
@Column(name = "party_organization_id")
private String partyOrganizationId;
@Column(name = "local_owner")
private Boolean localOwner;
public Zone() {
super();
}
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getLatDegree() {
return this.latDegree;
}
public void setLatDegree(Integer latDegree) {
this.latDegree = latDegree;
}
public String getLatHemisphere() {
return this.latHemisphere;
}
public void setLatHemisphere(String latHemisphere) {
this.latHemisphere = latHemisphere;
}
public Integer getLongDegree() {
return this.longDegree;
}
public void setLongDegree(Integer longDegree) {
this.longDegree = longDegree;
}
public String getLongHemisphere() {
return this.longHemisphere;
}
public void setLongHemisphere(String longHemisphere) {
this.longHemisphere = longHemisphere;
}
public String getNationalLocID() {
return this.nationalLocID;
}
public void setNationalLocID(String nationalLocID) {
this.nationalLocID = nationalLocID;
}
public String getGlobalLocNum() {
return this.globalLocNum;
}
public void setGlobalLocNum(String globalLocNum) {
this.globalLocNum = globalLocNum;
}
public Float getLatMinute() {
return this.latMinute;
}
public void setLatMinute(Float latMinute) {
this.latMinute = latMinute;
}
public Float getLongMinute() {
return this.longMinute;
}
public void setLongMinute(Float longMinute) {
this.longMinute = longMinute;
}
public String getZoneName() {
return this.zoneName;
}
public void setZoneName(String zoneName) {
this.zoneName = zoneName;
}
public String getCountryCode() {
return this.countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
public String getOwnerNation() {
return this.ownerNation;
}
public void setOwnerNation(String ownerNation) {
this.ownerNation = ownerNation;
}
public String getPartyOrganizationId() {
return this.partyOrganizationId;
}
public void setPartyOrganizationId(String partyOrganizationId) {
this.partyOrganizationId = partyOrganizationId;
}
public Boolean getLocalOwner() {
return this.localOwner;
}
public void setLocalOwner(Boolean localOwner) {
this.localOwner = localOwner;
}
public Boolean getPartyIdTracking () {
return this.partyIdTracking ;
}
public void setPartyIdTracking (PartyIdTracking partyIdTracking ) {
this.partyIdTracking = partyIdTracking ;
}
}
跟踪表：
@Entity
@Table(name = "party_id_tracking")
@Access(AccessType.FIELD)
public class PartyIdTracking extends BaseEntity {
@OneToOne(fetch = FetchType.LAZY)
private Zone zone;
@Column(name = "notified_date")
@Temporal(TemporalType.TIMESTAMP)
private Date notifiedDate;
@Column(name = "endpoint_id")
private Long endpointId;
@Column(name = "zone_id")
private Long zoneId;
public Date getNotifiedDate() {
return this.notifiedDate;
}
public void setNotifiedDate(Date notifiedDate) {
this.notifiedDate = notifiedDate;
}
public Long getEndpointId() {
return this.endpointId;
}
public void setEndpointId(Long endpointId) {
this.endpointId = endpointId;
}
public Long getZoneId() {
return this.zoneId;
}
public void setZoneId(Long zoneId) {
this.zoneId = zoneId;
}
public Zone getZone() {
return this.zone;
}
public void setZone(Zone zone) {
this.zone = zone;
}
}
希望它会有所帮助。