Hibernate 和 JPA 注解方式自定义ID生成器

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/** * Test.java * 实体类定义和配置 */package com.saving.ecm.resource.entity;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.Table;import javax.xml.bind.annotation.XmlRootElement;import org.hibernate.annotations.GenericGenerator;import org.hibernate.annotations.Parameter;@XmlRootElement@Entity@Table(name = "test")public class Test {@Id@GeneratedValue(generator = "idGenerator")@GenericGenerator(name = "idGenerator", strategy = "com.saving.ecm.resource.entity.IdGenerator",parameters = { @Parameter(name = "dataCenterID", value = "20") ,@Parameter(name = "idLength", value = "10")})private String code;@Column(name = "name", nullable = false, columnDefinition = "varchar(48) default '' comment '名字'")private String name;public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

模拟自定义ID生成器

package com.saving.ecm.resource.entity;import java.io.Serializable;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Properties;import org.hibernate.dialect.Dialect;import org.hibernate.engine.spi.SessionImplementor;import org.hibernate.id.AbstractUUIDGenerator;import org.hibernate.id.Configurable;import org.hibernate.type.Type;public class IdGenerator implements Configurable,IdentifierGenerator {public String dataCenterID;public String idLength;public void configure(Type type, Properties params, Dialect d) {this.dataCenterID = params.getProperty("dataCenterID");this.idLength = params.getProperty("idLength");}public Serializable generate(SessionImplementor session, Object obj) {return dataCenterID + idLength;}}

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