Question

我是JPA新手。我很难定义表连接。你能帮助我吗？

以下是ER模型。

JPA实体应该如何？我需要CRUD操作非常感谢！

alt

这是DB Script：

CREATE TABLE vidrio ( id_vidrio INT AUTO_INCREMENT NOT NULL, grosor DOUBLE PRECISION NOT NULL, largo DOUBLE PRECISION NOT NULL, ancho DOUBLE PRECISION NOT NULL, precio DOUBLE PRECISION NOT NULL, descripcion VARCHAR (250) NOT NULL, PRIMARY KEY (id_vidrio) );

CREATE TABLE persona ( id_persona VARCHAR (250) NOT NULL, nombre VARCHAR (250) NOT NULL, apellido VARCHAR (250) NOT NULL, direccion VARCHAR (250) NOT NULL, ciudad VARCHAR (250) NOT NULL, telefono VARCHAR (250) NOT NULL, PRIMARY KEY (id_persona) );

CREATE TABLE empleado ( id_empleado VARCHAR (250) NOT NULL, id_persona VARCHAR (250) NOT NULL, gerente BOOLEAN NOT NULL, contrasena VARCHAR (250) NOT NULL, PRIMARY KEY (id_empleado) );

CREATE TABLE factura ( factura_id INT AUTO_INCREMENT NOT NULL, fecha DATE NOT NULL, id_empleado VARCHAR (250) NOT NULL, id_persona VARCHAR (250) NOT NULL, id_empleado_corte VARCHAR (250) NOT NULL, PRIMARY KEY (factura_id) );

CREATE TABLE detalle_factura ( factura_id INT NOT NULL, id_vidrio INT NOT NULL, PRIMARY KEY (factura_id) );

CREATE TABLE cotizacion ( cotizacion_id INT NOT NULL, id_empleado VARCHAR (250) NOT NULL, id_persona VARCHAR (250) NOT NULL, PRIMARY KEY (cotizacion_id) );

CREATE TABLE detalle_cotizacion ( cotizacion_id INT NOT NULL, id_vidrio INT NOT NULL, PRIMARY KEY (cotizacion_id) );

数据库约束

ALTER TABLE detalle_factura ADD CONSTRAINT vidrio_detalle_factura_fk FOREIGN KEY (id_vidrio) REFERENCES vidrio (id_vidrio) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE detalle_cotizacion ADD CONSTRAINT vidrio_detalle_cotizacion_fk FOREIGN KEY (id_vidrio) REFERENCES vidrio (id_vidrio) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE empleado ADD CONSTRAINT persona_empleado_fk FOREIGN KEY (id_persona) REFERENCES persona (id_persona) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE factura ADD CONSTRAINT persona_factura_fk FOREIGN KEY (id_persona) REFERENCES persona (id_persona) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE cotizacion ADD CONSTRAINT persona_cotizacion_fk FOREIGN KEY (id_persona) REFERENCES persona (id_persona) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE cotizacion ADD CONSTRAINT empleado_cotizacion_fk FOREIGN KEY (id_empleado) REFERENCES empleado (id_empleado) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE factura ADD CONSTRAINT empleado_factura_fk FOREIGN KEY (id_empleado) REFERENCES empleado (id_empleado) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE factura ADD CONSTRAINT empleado_factura_fk1 FOREIGN KEY (id_empleado_corte) REFERENCES empleado (id_empleado) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE detalle_factura ADD CONSTRAINT factura_detalle_factura_fk FOREIGN KEY (factura_id) REFERENCES factura (factura_id) ON DELETE NO ACTION ON UPDATE NO ACTION;

ALTER TABLE detalle_cotizacion ADD CONSTRAINT cotizacion_detalle_cotizacion_fk FOREIGN KEY (cotizacion_id) REFERENCES cotizacion (cotizacion_id) ON DELETE NO ACTION ON UPDATE NO ACTION;

我在定义JPA实体时遇到问题。同时坚持数据。

Answer 1

检查这个。

**Cotizacion.java**

@Entity
@Table(name = "cotizacion")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Cotizacion.findAll", query = "SELECT c FROM Cotizacion c"),
    @NamedQuery(name = "Cotizacion.findByCotizacionId", query = "SELECT c FROM Cotizacion c WHERE c.cotizacionId = :cotizacionId")})
public class Cotizacion implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "cotizacion_id")
    private Integer cotizacionId;
    @OneToOne(cascade = CascadeType.ALL, mappedBy = "cotizacion")
    private DetalleCotizacion detalleCotizacion;
    @JoinColumn(name = "id_persona", referencedColumnName = "id_persona")
    @ManyToOne(optional = false)
    private Persona idPersona;
    @JoinColumn(name = "id_empleado", referencedColumnName = "id_empleado")
    @ManyToOne(optional = false)
    private Empleado idEmpleado;

    //Getters And Settes
}

**DetalleCotizacion.java**

@Entity
@Table(name = "detalle_cotizacion")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "DetalleCotizacion.findAll", query = "SELECT d FROM DetalleCotizacion d"),
    @NamedQuery(name = "DetalleCotizacion.findByCotizacionId", query = "SELECT d FROM DetalleCotizacion d WHERE d.cotizacionId = :cotizacionId")})
public class DetalleCotizacion implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "cotizacion_id")
    private Integer cotizacionId;
    @JoinColumn(name = "id_vidrio", referencedColumnName = "id_vidrio")
    @ManyToOne(optional = false)
    private Vidrio idVidrio;
    @JoinColumn(name = "cotizacion_id", referencedColumnName = "cotizacion_id", insertable = false, updatable = false)
    @OneToOne(optional = false)
    private Cotizacion cotizacion;

    //Getters And Setters
}

**DetalleFactura.java**

@Entity
@Table(name = "detalle_factura")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "DetalleFactura.findAll", query = "SELECT d FROM DetalleFactura d"),
    @NamedQuery(name = "DetalleFactura.findByFacturaId", query = "SELECT d FROM DetalleFactura d WHERE d.facturaId = :facturaId")})
public class DetalleFactura implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "factura_id")
    private Integer facturaId;
    @JoinColumn(name = "id_vidrio", referencedColumnName = "id_vidrio")
    @ManyToOne(optional = false)
    private Vidrio idVidrio;
    @JoinColumn(name = "factura_id", referencedColumnName = "factura_id", insertable = false, updatable = false)
    @OneToOne(optional = false)
    private Factura factura;

    //Getters And Setters
}

**Empleado.java**

@Entity
@Table(name = "empleado")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Empleado.findAll", query = "SELECT e FROM Empleado e"),
    @NamedQuery(name = "Empleado.findByIdEmpleado", query = "SELECT e FROM Empleado e WHERE e.idEmpleado = :idEmpleado"),
    @NamedQuery(name = "Empleado.findByGerente", query = "SELECT e FROM Empleado e WHERE e.gerente = :gerente"),
    @NamedQuery(name = "Empleado.findByContrasena", query = "SELECT e FROM Empleado e WHERE e.contrasena = :contrasena")})
public class Empleado implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "id_empleado")
    private String idEmpleado;
    @Basic(optional = false)
    @Column(name = "gerente")
    private boolean gerente;
    @Basic(optional = false)
    @Column(name = "contrasena")
    private String contrasena;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEmpleado")
    private Set<Cotizacion> cotizacionSet;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEmpleadoCorte")
    private Set<Factura> facturaSet;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEmpleado")
    private Set<Factura> facturaSet1;
    @JoinColumn(name = "id_persona", referencedColumnName = "id_persona")
    @ManyToOne(optional = false)
    private Persona idPersona;

    //Getters And Setters
}

**Factura.java**

@Entity
@Table(name = "factura")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Factura.findAll", query = "SELECT f FROM Factura f"),
    @NamedQuery(name = "Factura.findByFacturaId", query = "SELECT f FROM Factura f WHERE f.facturaId = :facturaId"),
    @NamedQuery(name = "Factura.findByFecha", query = "SELECT f FROM Factura f WHERE f.fecha = :fecha")})
public class Factura implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "factura_id")
    private Integer facturaId;
    @Basic(optional = false)
    @Column(name = "fecha")
    @Temporal(TemporalType.DATE)
    private Date fecha;
    @JoinColumn(name = "id_persona", referencedColumnName = "id_persona")
    @ManyToOne(optional = false)
    private Persona idPersona;
    @JoinColumn(name = "id_empleado_corte", referencedColumnName = "id_empleado")
    @ManyToOne(optional = false)
    private Empleado idEmpleadoCorte;
    @JoinColumn(name = "id_empleado", referencedColumnName = "id_empleado")
    @ManyToOne(optional = false)
    private Empleado idEmpleado;
    @OneToOne(cascade = CascadeType.ALL, mappedBy = "factura")
    private DetalleFactura detalleFactura;

    //Getters And Setters
}

**Persona.java**

@Entity
@Table(name = "persona")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Persona.findAll", query = "SELECT p FROM Persona p"),
    @NamedQuery(name = "Persona.findByIdPersona", query = "SELECT p FROM Persona p WHERE p.idPersona = :idPersona"),
    @NamedQuery(name = "Persona.findByNombre", query = "SELECT p FROM Persona p WHERE p.nombre = :nombre"),
    @NamedQuery(name = "Persona.findByApellido", query = "SELECT p FROM Persona p WHERE p.apellido = :apellido"),
    @NamedQuery(name = "Persona.findByDireccion", query = "SELECT p FROM Persona p WHERE p.direccion = :direccion"),
    @NamedQuery(name = "Persona.findByCiudad", query = "SELECT p FROM Persona p WHERE p.ciudad = :ciudad"),
    @NamedQuery(name = "Persona.findByTelefono", query = "SELECT p FROM Persona p WHERE p.telefono = :telefono")})
public class Persona implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "id_persona")
    private String idPersona;
    @Basic(optional = false)
    @Column(name = "nombre")
    private String nombre;
    @Basic(optional = false)
    @Column(name = "apellido")
    private String apellido;
    @Basic(optional = false)
    @Column(name = "direccion")
    private String direccion;
    @Basic(optional = false)
    @Column(name = "ciudad")
    private String ciudad;
    @Basic(optional = false)
    @Column(name = "telefono")
    private String telefono;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idPersona")
    private Set<Cotizacion> cotizacionSet;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idPersona")
    private Set<Factura> facturaSet;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idPersona")
    private Set<Empleado> empleadoSet;

    //Getters And Setters
}

Vidrio.java

@Entity
@Table(name = "vidrio")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Vidrio.findAll", query = "SELECT v FROM Vidrio v"),
    @NamedQuery(name = "Vidrio.findByIdVidrio", query = "SELECT v FROM Vidrio v WHERE v.idVidrio = :idVidrio"),
    @NamedQuery(name = "Vidrio.findByGrosor", query = "SELECT v FROM Vidrio v WHERE v.grosor = :grosor"),
    @NamedQuery(name = "Vidrio.findByLargo", query = "SELECT v FROM Vidrio v WHERE v.largo = :largo"),
    @NamedQuery(name = "Vidrio.findByAncho", query = "SELECT v FROM Vidrio v WHERE v.ancho = :ancho"),
    @NamedQuery(name = "Vidrio.findByPrecio", query = "SELECT v FROM Vidrio v WHERE v.precio = :precio"),
    @NamedQuery(name = "Vidrio.findByDescripcion", query = "SELECT v FROM Vidrio v WHERE v.descripcion = :descripcion")})
public class Vidrio implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id_vidrio")
    private Integer idVidrio;
    @Basic(optional = false)
    @Column(name = "grosor")
    private double grosor;
    @Basic(optional = false)
    @Column(name = "largo")
    private double largo;
    @Basic(optional = false)
    @Column(name = "ancho")
    private double ancho;
    @Basic(optional = false)
    @Column(name = "precio")
    private double precio;
    @Basic(optional = false)
    @Column(name = "descripcion")
    private String descripcion;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idVidrio")
    private Set<DetalleCotizacion> detalleCotizacionSet;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idVidrio")
    private Set<DetalleFactura> detalleFacturaSet;

    //Getters And Setters
}

创建JPA Join实体Java

1 个答案: