实体类注解生成数据库表

实体基类：是否启用

@MappedSuperclasspublic abstract class AbstractBasis extends AbstractEntity{private static final long serialVersionUID = 7952571906802309278L;/** * 禁用状态，false：禁用  true：可用 */private Boolean isEnable = true;@Column(nullable = false)public Boolean getIsEnable(){return isEnable;}public void setIsEnable(Boolean isEnable){this.isEnable = isEnable;}}

@MappedSuperclass 作用：封闭类中的通用属性（如：id）,此类不能再添加@Entity或@Table注解，即不会映射到数据库表,产生数据库表，但该类的属性将映射到其子类中，数据库中表也将生成对应的字段。

实体类（标签）

@Entity@Table(name = "edu_tag")public class EduTag extends AbstractBasis {private static final long serialVersionUID = -5409801373006627913L;private String code;private Long appId;private Long corpCode;/**教育号编码 */private String name;private School school;@Id@Column(name="edu_tag_code",nullable = false, length = 20)public String getCode() {return code;}public void setCode(String code) {this.code = code;}@Column(name="edu_tag_name",nullable = false,length = 20)public String getName() {return name;}public void setName(String name) {this.name = name;}@Column(name="edu_tag_appId" ,nullable = false,length = 20)public Long getAppId() {return appId;}public void setAppId(Long appId) {this.appId = appId;}@Column(name="edu_tag_corpCode", nullable = false,length = 20)public Long getCorpCode() {return corpCode;}public void setCorpCode(Long corpCode) {this.corpCode = corpCode;}
     @OneToOne(cascade = CascadeType.REFRESH , fetch = FetchType.EAGER)@JoinColumn(name = "edu_corp_shcool")public School getShcool() {return shcool;}public void setShcool(School shcool) {this.shcool = shcool;}}@Entity ： 实体类@Table（name  = "xxx"）： 定义数据库表名xxx@Id ： 定义主键@Column： 定时数据库表字段 （name:字段名，nullable:是否允许为null，length:字段长度）@OneToOne： 定时外键（CascadeType.REFRESH：保持数据完整，查检关联表中的数据，FetchType.EAGER：急加载 ）@JoinColumn： 功能与@Column类似。org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: could not initialize proxy - no Session (through reference chain: com.nenglong.zsedu.ucenter.api.po.educorp.EduCorp["organization"]->com.nenglong.zsedu.ucenter.api.po.basic.Organization_$$_jvst2c4_12["name"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy - no Session (through reference chain: com.nenglong.zsedu.ucenter.api.po.educorp.EduCorp["organization"]->com.nenglong.zsedu.ucenter.api.po.basic.Organization_$$_jvst2c4_12["name"])该报错的解决方法： 将FetchType.EAGER.LZAY改为 FetchType.EAGER。