@注解_双向一对多映射

来源：互联网发布：软件开发解决方案模板编辑：程序博客网时间：2024/06/06 01:14

直接上代码咯

package cn.jbit.test2.bean;import java.io.Serializable;import java.util.HashSet;import java.util.Set;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.OneToMany;import javax.persistence.Table;@Entity@Table(name = "test_district2")public class District implements Serializable {private static final long serialVersionUID = -6358000709323619820L;@Id@GeneratedValueprivate Integer id;@Column(name = "name")private String name;@OneToMany(mappedBy = "district", targetEntity = Street.class)private Set<Street> streets = new HashSet<Street>();public District() {super();}public District(Integer id, String name, Set<Street> streets) {super();this.id = id;this.name = name;this.streets = streets;}public Integer getId() {return id;}@SuppressWarnings("unused")private void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}protected Set<Street> getStreets() {return streets;}protected void setStreets(Set<Street> streets) {this.streets = streets;}public void addStreet(Street street) {streets.add(street);street.setDistrict(this);}public void removeStreet(Street street) {streets.remove(street);street = null;}}

package cn.jbit.test2.bean;import java.io.Serializable;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.Table;@Entity@Table(name = "test_street2")public class Street implements Serializable {private static final long serialVersionUID = -2865844315350365126L;@Id@GeneratedValueprivate Integer id;@Column(name = "name")private String name;@ManyToOne@JoinColumn(name = "district_id")private District district;public Street() {super();}public Street(Integer id, String name, District district) {super();this.id = id;this.name = name;this.district = district;}public Integer getId() {return id;}@SuppressWarnings("unused")private void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public District getDistrict() {return district;}public void setDistrict(District district) {this.district = district;}}

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