我有一个错误,JPA持久存在我的数据库中,当我将第二个文件持久存储到数据库时发生错误.我需要导入大量数据集,每个数据集有5张.即使某些相同的数据已经存在,也需要更新每个表.目前我收到以下错误
错误
17:26:35,315 WARN [org.hibernate.engine.jdbc.spi.sqlExceptionHelper] (http-localhost-127.0.0.1-8080-1) sql Error: 1062,sqlState: 23000 17:26:35,316 ERROR [org.hibernate.engine.jdbc.spi.sqlExceptionHelper] (http-localhost-127.0.0.1-8080-1) Duplicate entry '0' for key 'PRIMARY'
数据库脚本
我创建数据库的脚本如下：
CREATE DATABASE IF NOT EXISTS sampleDB; use sampleDB; CREATE TABLE IF NOT EXISTS `Table1`(`mcc` int(10) NOT NULL,`mnc` int(10) NOT NULL,`operator` varchar(50) DEFAULT NULL,`country` varchar(50) DEFAULT NULL,PRIMARY KEY (`mcc`,`mnc`))ENGINE=InnoDB; CREATE TABLE IF NOT EXISTS `Table2`(`tac` int(10) NOT NULL,`marketingName` varchar(50) DEFAULT NULL,`manufacturer` varchar(50) DEFAULT NULL,`accessCapability` varchar(200) DEFAULT NULL,`model` varchar(50) DEFAULT NULL,`vendorName` varchar(50) DEFAULT NULL,`ueType` varchar(20) DEFAULT NULL,`os` varchar(20) DEFAULT NULL,`inputMode` varchar(20) DEFAULT NULL,PRIMARY KEY (`tac`))ENGINE=InnoDB; CREATE TABLE IF NOT EXISTS `Table3`(`causeClass` varchar(10) NOT NULL,`description` varchar(255) NOT NULL,PRIMARY KEY (`causeClass`))ENGINE=InnoDB; CREATE TABLE IF NOT EXISTS `Table4`(`causeCode` int(5) NOT NULL,`eventId` int(5) NOT NULL,`description` varchar(255) DEFAULT NULL,PRIMARY KEY (`causeCode`,`eventId`) ON UPDATE NO ACTION))ENGINE=InnoDB; CREATE TABLE IF NOT EXISTS `Table5`(`baseDataTableId` int(11) NOT NULL AUTO_INCREMENT,`dateTime` DATETIME NOT NULL,`causeClass` varchar(10) NOT NULL,`ueType` int(15) NOT NULL,`market` int(10) NOT NULL,`operator` int(10) NOT NULL,`cellId` tinyint(2) DEFAULT NULL,`duration` smallint(7) DEFAULT NULL,`causeCode` int(5) NOT NULL,`neVersion` varchar(7) DEFAULT NULL,`imsi` varchar(255) DEFAULT NULL,`hier3Id` varchar(255) DEFAULT NULL,`hier32Id` varchar(255) DEFAULT NULL,`hier321Id` varchar(255) DEFAULT NULL,PRIMARY KEY (`baseDataTableId`))ENGINE=InnoDB;
Java Hibernate属性
我的Hibernate属性如下：
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="primary">
<jta-data-source>java:jboss/datasources/MysqLDS</jta-data-source>
<properties>
<!-- Properties for Hibernate -->
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MysqLDialect" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="false" />
</properties>
</persistence-unit>
</persistence>
Java的
实体类示例：
@Entity
@Table(name = "Table3")
public class Table3 {
@Id
private int causeClass;
private String description;
public Table3(){}
public Table3(int causeClass,String description) {
super();
this.causeClass = causeClass;
this.description = description;
}
// getters & setters
}
任何想法如何解决这个问题？
解决方法
确保使用良好的EntityManager方法更新现有实体.您似乎尝试执行持久操作而不是现有实体的合并.
当持久化antity时,尝试捕获EntityExistsException或PersistenceException,并在catch块中调用merge方法.
例如 ：
当持久化antity时,尝试捕获EntityExistsException或PersistenceException,并在catch块中调用merge方法.
例如 ：
save(Enity item){
try{
//Try to insert your entity by calling persist method
}
catch(EntityExistsException e){
//Entity you are trying to insert already exist,then call merge method
}
}