Question

我有这段代码：

.gChild {
position: absolute;
top: 50%;
transform: translateY(-50%);
}

这个主要

    <?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="project-unit" transaction-type="RESOURCE_LOCAL">
        <class>model.Product</class>
        <properties>
            <property name="openjpa.ConnectionDriverName" value="org.postgresql.Driver" />
            <property name="openjpa.ConnectionUserName" value="postgres" />
            <property name="openjpa.ConnectionPassword" value="xxx" />
            <property name="openjpa.ConnectionURL" value="jdbc:postgresql://localhost:5432/project" />
            <property name="openjpa.jdbc.DBDictionary" value="postgres" />
            <property name="openjpa.jdbc.SynchronizeMappings"
                                                     value="buildSchema(SchemaAction=add,ForeignKeys=true)" />
            <property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO" />
        </properties>
    </persistence-unit>
</persistence>

和这个产品类：包模型;

import model.*;

import javax.persistence.*;

public class pruebaMain {

    public static void main(String [] args){

        EntityManagerFactory emf = Persistence.createEntityManagerFactory("project-unit");
        EntityManager em = emf.createEntityManager();

        Product product = new Product();
        product.setName("cheese");
        product.setCode(21421);
        product.setDescription("Test description");

        EntityTransaction tx= em.getTransaction();
        tx.begin();
        em.persist(product);
        tx.commit();

        em.close();
        emf.close();

    }

}

但是，当我尝试代码时，我有这个错误：

import javax.persistence.*;

@Entity
public class Product {

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
long code;
@Column(nullable=false,length=50)
String name;
@Column(nullable=false,length=500)
String description;
@Column(nullable=false)
int stock;

//builders
public Product(){
    this.code=0;
    this.name="";
    this.description="";
    this.stock=0;
}
public Product(long code, String name, String description,int stock){

    this.code=code;
    this.name=name;
    this.name=description;
    this.stock=stock;
}

//get & set
public long getCode() {
    return code;
}

public void setCode(long code) {
    this.code = code;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public int getStock() {
    return stock;
}

public void setStock(int stock) {
    this.stock = stock;
}



}

我不知道是什么问题。我指定了ConnectionDriverName并添加到构建路径：postgresql-jdbc4.jar，postgresql-9.3-1100.jdbc41.jar

谢谢！

Answer 1

我解决了。我把persistence.xml放在一个错误的文件夹中，现在它在META-INF中，它可以工作！

Postgresql驱动程序错误

1 个答案: