RetDAO.java (part1) ..reference. Is this logic good?

public static int searchDelete(Connection conn,String ret_id) throws Exception {
//System.out.println(ret_id); st=conn.createStatement(); //System.out.println("Where"); ResultSet rs=st.executeQuery("select * from RETAILER where RETAILERID='"+retid+"'"); //System.out.println("asudhwdioq");

    if(rs.next())
    {
        return 1;
    }
    else return 0;
}

public static int chk_order(Connection conn,String ret_id) throws Exception
{
    int a=0;
    System.out.println("Where");
    System.out.println(ret_id);
    ResultSet rs=st.executeQuery("select * from ORDER_TABLE where RETAILER_ID='"+ret_id+"'");

    System.out.println("qwggggg");

    if(rs.next()==false)
    {
        return 2;
    }
    while(rs.next())
    {   
        System.out.println("qwggggg");
        if(rs.getString(4).equals("Allocated"))
        {
            System.out.println("Girish");
            a=0;
            break;
        }
        else a=1;
        System.out.println(rs.getString(4));
    }
    if(a==0)
    {
        return 0;     
    }
    else return 1;
}

public static int untag(Connection conn,String ret_id) throws Exception
{
    st=conn.createStatement();
    System.out.println("Delete ho ja");
    int k=st.executeUpdate("delete from tag_product_tbl where retailer_id='"+ret_id+"'");
    return k;
}


public static int deleteRet(Connection conn,String ret_id) throws Exception
{
    st=conn.createStatement(); 
    System.out.println("Delete yahape bhi hoga");

    rs=st.executeQuery("select * from retailer where retailer_id='"+ret_id+"'");
    rs.next();
    String s1=rs.getString(1);
    String s2=rs.getString(2);
    String s3=rs.getString(3);
    String s4=rs.getString(4);
    int s5=rs.getInt(5);
    String s6=rs.getString(6);
    String s7=rs.getString(8);
    String s8=rs.getString(9);

    System.out.println(s1);
    System.out.println(s2);
    System.out.println(s3);
    System.out.println(s4);
    System.out.println(s5);
    System.out.println(s6);
    System.out.println(s7);
    System.out.println(s8);

    int a=st.executeUpdate("insert into inactive values('"+s1+"','"+s2+"','"+s3+"','"+s4+"',"+s5+",'"+s6+"')");
    System.out.println("a="+a);

    int z=st.executeUpdate("delete from retailer where retailer_id='"+ret_id+"'");
    System.out.println("hua kya?");
    return z;
}