prevent hibernate foreign key duplicates

dao.java method

public boolean addMember(M_member member)
{
	
      
	   Session session =HibernateUtil.getSessionFactory().openSession();
		 Transaction tx = null;
	       try
	       {
	    	     
	    //	   SimpleDateFormat inFmt = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss",new Locale("es", "ES"));
	    	   SimpleDateFormat inFmt1 = new SimpleDateFormat("dd-MM-yyyy",new Locale("es", "ES"));
	    	   SimpleDateFormat outFmt1 = new SimpleDateFormat("yyyy-MM-dd", new Locale("es", "ES"));
	    	 
	    	   Date membershipdate=inFmt1.parse(member.getMembership_eff_date());  
	    	   Date roledate=inFmt1.parse(member.getRole_eff_date());
	    	  // Date updateddate=inFmt1.parse(member.getUpdated_date_time());  
	    	  
	    	   System.out.println(" IN DAO Payment mode------"+member.getPayment_mode());
	    	
	    	   if(member.getPayment_mode().equals("Ch")||member.getPayment_mode().equals("DD")||member.getPayment_mode().equals("PO"))
	    	   {
       	Date ch_date=inFmt1.parse(member.getInstrument_date());
       	member.setInstrument_date(outFmt1.format(ch_date));
	    	   }
       
	    	  tx=session.beginTransaction();
	   	      
	    	  Query qr1=session.createQuery("select m.devotee_id from M_member m");
	    	   List<M_member> l1=qr1.list();       
	    	   for(M_member mi:l1)  
	    	   {	
	    	       if(!(l1.contains(member.getDevotee_id())))
	    	       {
	    	         member.setDevotee_id(member.getDevotee_id());
	   	           //System.out.println("print devotee id"+member.getDevotee_id());
	    	       }    
	    	   }    
	    	       //// 
	   	   //   if(member.getDevotee_id()==)
	   	      
	   	      member.setMembership_eff_date(outFmt1.format(membershipdate));
	    	  System.out.println(" IN DAO Membership eff date------"+member.getMembership_eff_date());
	    	  member.setRole_eff_date(outFmt1.format(roledate));
	    	  System.out.println(" IN DAO Role eff date------"+member.getRole_eff_date());
	    	  	   
	    	   

	    	 
	          Query qry=session.createQuery("from M_member where membership_receipt_no=(select max(membership_receipt_no) from M_member)");
	   	
	          //Query qry=session.createQuery("select m.membership_receipt_no from M_member m, M_devotee d where membership_receipt_no=(select max(membership_receipt_no) from M_member)");
			
	          List<M_member> pl = qry.list();
		
	           int i=0;
	           for(M_member mp : pl) 
	           {
		
				i=Integer.parseInt(mp.getMembership_receipt_no());
				i=i+1;
				member.setMembership_receipt_no(String.valueOf(i));
			   }
	   	       if(member.getMembership_receipt_no()==null)
	   	       {
	   	    	 member.setMembership_receipt_no("1");
	   	       }
	   	       session.save(member);
	   	       tx.commit();
	   	    

	   	       }
	   	       catch(Exception e)
	   	       {
	   	    	   
	   	    	 if(tx!=null)
	 		    	tx.rollback();
	   	    	   
	   	    	 e.printStackTrace();
	   	    	 return false;
	   	       }
	   	       finally
	   	       {   
	   	      
	   	       session.close();
	   	       
	   	       }        

	   	       return true;


	   	       }
	   	           
	  
	       
	       

m_devotee mapping

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
  <class name="com.cmc.sibs.vo.M_devotee" table="m_devotee" dynamic-insert="true">
      <id name="devotee_id"  column="devotee_id" >
       <generator class="native"/>
        </id>

<!--  <property name="title">-->
<!--    <column name="title"/>-->
<!--  </property>-->

  
 <many-to-one name="title" class="com.cmc.sibs.vo.M_title"  column="title" cascade="none" >
  </many-to-one> 

	  
  <property name="first_name">
    <column name="first_name"/>
  </property>
  
  <property name="middle_name">
    <column name="middle_name"/>
  </property>
  
  <property name="last_name">
    <column name="last_name"/>
  </property>
           
<!--  <property name="rashi">-->
<!--    <column name="rashi"/>-->
<!--  </property> -->
  
 <many-to-one name="rashi" class="com.cmc.sibs.vo.M_rashi"  column="rashi" cascade="none" >
  </many-to-one> 
  
    <property name="address1">
    <column name="address1"/>
  </property>
     <property name="address2">
    <column name="address2"/>
  </property>
     <property name="address3">
    <column name="address3"/>
     </property>
  
<!--  <property name="city">-->
<!--    <column name="city"/>-->
<!--  </property>-->
  
   <many-to-one name="city" class="com.cmc.sibs.vo.M_city"  column="city" cascade="none" not-null="true" >
  </many-to-one>
  
        
  <property name="pincode">
    <column name="pincode"/>
  </property> 
    <property name="mobile_no">
    <column name="mobile_no"/>
  </property>
  <property name="email_id">
    <column name="email_id"/>
  </property>
        
<!--  <property name="state">-->
<!--    <column name="state"/>-->
<!--  </property> -->
  <many-to-one name="state" class="com.cmc.sibs.vo.M_state"  column="state" cascade="none" not-null="true" >
  </many-to-one>
<!--  -->
<!--  <property name="nakshatra">-->
<!--    <column name="nakshatra"/>-->
<!--  </property> -->
  
 <many-to-one name="nakshatra" class="com.cmc.sibs.vo.M_nakshatra"  column="nakshatra" cascade="none"  >
  </many-to-one>  

    <property name="dob" >
    <column name="dob"/>
  </property> 
  
<!--  <property name="created_by" >-->
<!--    <column name="created_by"/>-->
<!--  </property>-->
  
 <many-to-one name="created_by" class="com.cmc.sibs.vo.M_users"  column="created_by" cascade="none" >
  </many-to-one>  
  
  
    <property name="created_date_time" >
    <column name="created_date_time"/>
  </property>
  
    <property name="member_category" >
    <column name="member_category"/>
  </property>
  
  <property name="gender" >
    <column name="gender"/>
  </property>
   
   <property name="user_type" >
    <column name="user_type"/>
  </property>
       
  
   <property name="stdcode" >
    <column name="stdcode"/>
  </property>
  
   <property name="landline_no" >
    <column name="landline_no"/>
  </property>
  
   <property name="committee_role" >
    <column name="committee_role"/>
  </property>
<!--  -->
<!--     <property name="country" >-->
<!--    <column name="country"/>-->
<!--  </property>-->
  <many-to-one name="country" class="com.cmc.sibs.vo.M_country"  column="country" cascade="none" not-null="true" >
  </many-to-one>
  
<!--  -->
<!--      <property name="suburban" >-->
<!--    <column name="suburban"/>-->
<!--    </property>-->
  
   <many-to-one name="suburban" class="com.cmc.sibs.vo.M_suburb"  column="suburban" cascade="none" not-null="true" >
  </many-to-one>
  
       <property name="signatory_flag" >
    <column name="signatory_flag"/>
    </property>
  
 
  
 </class>
</hibernate-mapping>

m_member mapping

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
  <class name="com.cmc.sibs.vo.M_member" table="m_member">
      <id name="member_id"  column="member_id" >
       <generator class="native"/>
        </id>
  
 <many-to-one name="devotee_id" class="com.cmc.sibs.vo.M_devotee"  column="devotee_id" unique="true" >
  </many-to-one> 
  
   <property name="membership_type">
    <column name="membership_type"/>     
  </property>
  
   <property name="membership_eff_date">
    <column name="membership_eff_date"/>     
  </property>
  
   <property name="committee_role">
    <column name="committee_role"/>     
  </property>
  
   <property name="signatory_or_not">
    <column name="signatory_or_not"/>     
  </property>
  
   <property name="role_eff_date">
    <column name="role_eff_date"/>     
  </property>
  
    
 <many-to-one name="updated_by" class="com.cmc.sibs.vo.M_users"  column="updated_by"  >
  </many-to-one> 
  
    <property name="updated_date_time">
    <column name="updated_date_time"/>     
  </property>
  
  
    <property name="active_status">
    <column name="active_status"/>     
  </property>
  
  
    <property name="payment_mode">
    <column name="payment_mode"/>     
  </property>
  
  
    <property name="membership_amount">
    <column name="membership_amount"/>     
  </property>
  
  
    <property name="instrument_no">
    <column name="instrument_no"/>     
  </property>
  
  
    <property name="instrument_date">
    <column name="instrument_date"/>     
  </property>
  
  
    <property name="bank_name">
    <column name="bank_name"/>     
  </property>
  
  
    <property name="bank_branch_location">
    <column name="bank_branch_location"/>     
  </property>
  
  
    <property name="membership_receipt_no">
    <column name="membership_receipt_no"/>     
  </property>
  
    
  
</class>
</hibernate-mapping>

orm class m_devotee

package com.cmc.sibs.vo;

public class M_devotee{
	String devotee_id;
	String first_name;
	String middle_name;
	String last_name;
	M_title title;
	String address1;
	String address2;
	String address3;
    String pincode;
	String mobile_no;
	String email_id;
	String dob;
	M_users created_by;
	String created_date_time;
	String member_category;
	String gender;
	String user_type;
	String stdcode;
	String landline_no;
	String committee_role;
	String signatory_flag;
	M_nakshatra nakshatra;
	M_rashi rashi;
	M_country country;
	M_state state;
	M_city city;
	M_suburb suburban;
	
	
	public String getAddress1() {
		return address1;
	}
	public void setAddress1(String address1) {
		this.address1 = address1;
	}
	public String getAddress2() {
		return address2;
	}
	public void setAddress2(String address2) {
		this.address2 = address2;
	}
	public String getAddress3() {
		return address3;
	}
	public void setAddress3(String address3) {
		this.address3 = address3;
	}
	public M_city getCity() {
		return city;
	}
	public void setCity(M_city city) {
		this.city = city;
	}
	public String getCommittee_role() {
		return committee_role;
	}
	public void setCommittee_role(String committee_role) {
		this.committee_role = committee_role;
	}
	public M_country getCountry() {
		return country;
	}
	public void setCountry(M_country country) {
		this.country = country;
	}
	
	
	public M_users getCreated_by() {
		return created_by;
	}
	public void setCreated_by(M_users created_by) {
		this.created_by = created_by;
	}
	public String getCreated_date_time() {
		return created_date_time;
	}
	public void setCreated_date_time(String created_date_time) {
		this.created_date_time = created_date_time;
	}
	public String getDevotee_id() {
		return devotee_id;
	}
	public void setDevotee_id(String devotee_id) {
		this.devotee_id = devotee_id;
	}
	public String getDob() {
		return dob;
	}
	public void setDob(String dob) {
		this.dob = dob;
	}
	public String getEmail_id() {
		return email_id;
	}
	public void setEmail_id(String email_id) {
		this.email_id = email_id;
	}
	public String getFirst_name() {
		return first_name;
	}
	public void setFirst_name(String first_name) {
		this.first_name = first_name;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	public String getLandline_no() {
		return landline_no;
	}
	public void setLandline_no(String landline_no) {
		this.landline_no = landline_no;
	}
	public String getLast_name() {
		return last_name;
	}
	public void setLast_name(String last_name) {
		this.last_name = last_name;
	}
	public String getMember_category() {
		return member_category;
	}
	public void setMember_category(String member_category) {
		this.member_category = member_category;
	}
	public String getMiddle_name() {
		return middle_name;
	}
	public void setMiddle_name(String middle_name) {
		this.middle_name = middle_name;
	}
	public String getMobile_no() {
		return mobile_no;
	}
	public void setMobile_no(String mobile_no) {
		this.mobile_no = mobile_no;
	}
	public M_nakshatra getNakshatra() {
		return nakshatra;
	}
	public void setNakshatra(M_nakshatra nakshatra) {
		this.nakshatra = nakshatra;
	}
	public String getPincode() {
		return pincode;
	}
	public void setPincode(String pincode) {
		this.pincode = pincode;
	}
	public M_rashi getRashi() {
		return rashi;
	}
	public void setRashi(M_rashi rashi) {
		this.rashi = rashi;
	}
	public String getSignatory_flag() {
		return signatory_flag;
	}
	public void setSignatory_flag(String signatory_flag) {
		this.signatory_flag = signatory_flag;
	}
	public M_state getState() {
		return state;
	}
	public void setState(M_state state) {
		this.state = state;
	}
	public String getStdcode() {
		return stdcode;
	}
	public void setStdcode(String stdcode) {
		this.stdcode = stdcode;
	}
	public M_suburb getSuburban() {
		return suburban;
	}
	public void setSuburban(M_suburb suburban) {
		this.suburban = suburban;
	}

	public M_title getTitle() {
		return title;
	}
	public void setTitle(M_title title) {
		this.title = title;
	}
	public String getUser_type() {
		return user_type;
	}
	public void setUser_type(String user_type) {
		this.user_type = user_type;
	}
	
	
	
	

	
	
}