Question

我试图通过使用spring boot和JPA来显示来自数据库的数据，但它总是抛出这个错误

这是我的：applications.properties

ui.tableWidget->setSelectionBehavior( QAbstractItemView::SelectRows );
ui.tableWidget->selectRow( 2 );

这是我的实体：AppUser

# ===============================
# DATABASE
# ===============================

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/userapp
spring.datasource.username=root
spring.datasource.password=

server.port=9092

# ===============================
# JPA / HIBERNATE
# ===============================

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

现在这是我的DAO，包含请求的方法findUserAccount（）：

package entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;

@Entity
@Table(name = "App_User", //
        uniqueConstraints = { //
                @UniqueConstraint(name = "APP_USER_UK", columnNames = "User_Name") })
public class AppUser {

    @Id
    @GeneratedValue
    @Column(name = "User_Id", nullable = false)
    private Long userId;

    @Column(name = "User_Name", length = 36, nullable = false)
    private String userName;

    @Column(name = "Encryted_Password", length = 128, nullable = false)
    private String encrytedPassword;

    @Column(name = "Enabled", length = 1, nullable = false)
    private boolean enabled;

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getEncrytedPassword() {
        return encrytedPassword;
    }

    public void setEncrytedPassword(String encrytedPassword) {
        this.encrytedPassword = encrytedPassword;
    }

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }

}

最后消息错误：

package dao;

import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.Query;

import entity.AppUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@Repository
@Transactional
public class AppUserDAO {

    @Autowired
    private EntityManager entityManager;

    public AppUser findUserAccount(String userName) {
        try {
            String sql = "Select e from " + AppUser.class.getName() + " e " //
                    + " Where e.userName = :userName ";

            Query query = entityManager.createQuery(sql, AppUser.class);
            query.setParameter("userName", userName);

            return (AppUser) query.getSingleResult();
        } catch (NoResultException e) {
            return null;
        }
    }

}

感谢您的帮助

找不到查询类的持久化类：

0 个答案: