在看官方的文档时，测试了一下一对一映射建表，对应关系是一个pet对应一个master，然后建表插入遇到了如题的问题，以下是我的pojo类：

Pet类，

package demo.hello.pojo;

import org.nutz.dao.entity.annotation.*;
@Table("t_pet")
public class Pet {
	@Id(auto=true) // 表示该字段为一个自增长的Id,注意,是数据库表中自增!!
	//@Prev(els=@EL("$me.getId()"))
	//@Next(@SQL("SELECT t_pet('id')"))
	private Integer id;// @Id与属性名称id没有对应关系
	@Column
	private String pname;
	@Column
	private Integer age;
	
	@Column
	@Prev(@SQL ("SELECT photoPath from t_pet where pname = @pname"))
	private String photoPath;
	
	@Column
	private int masterId;
	@One(target=Master.class,field="masterId")
	
	private Master master;
	
	public int getMasterId() {
		return masterId;
	}
	public void setMasterId(int masterId) {
		this.masterId = masterId;
	}
	public Master getMaster() {
		return master;
	}
	public void setMaster(Master master) {
		this.master = master;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getPname() {
		return pname;
	}
	public void setPname(String pname) {
		this.pname = pname;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public String getPhotoPath() {
		return photoPath;
	}
	public void setPhotoPath(String photoPath) {
		this.photoPath = photoPath;
	}
	@Override
	public String toString() {
		return "Pet [id=" + id + ", pname=" + pname + ", age=" + age + ", photoPath=" + photoPath + ", masterId="
				+ masterId + ", master=" + master + "]";
	}
}

Master类：

package demo.hello.pojo;

import org.nutz.dao.entity.annotation.*;

@Table("t_master")
public class Master {
	@Id
	private Integer masterId;
	@Column
	private String name;
	@Column
	private Integer age;
	public Integer getMasterId() {
		return masterId;
	}
	public void setMasterId(Integer masterId) {
		this.masterId = masterId;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "Master [masterId=" + masterId + ", name=" + name + ", age=" + age + "]";
	}
	
}

第一次插入，成功且没有问题：

		dao.create(Master.class, false);
                Pet pet = new Pet();
		pet.setPname("tomcat");
		Master master = new Master();
		master.setName("chris");
		
		dao.insertWith(pet, "master");