java - updating in db from resultset -


the sql statement layers returns more 1 value, want update column in db these values problem here?

        string cust_code = session.getattribute("cust_code").tostring();         string video_typ = session.getattribute("video_typ").tostring();         int personal_p = integer.parseint(session.getattribute("personal_p").tostring());         int layers_p = integer.parseint(session.getattribute("layers_p").tostring());         string parent_cod = session.getattribute("parent_code").tostring();         class.forname("com.mysql.jdbc.driver");         connection con = drivermanager.getconnection("jdbc:mysql://localhost:3306/ontube", "root", "123456");         statement st = con.createstatement();         string personal_po = "update customers set personal_p =personal_p + '"+personal_p+"' membership_num='"+cust_code+"'  ";         string first_layer="update customers set layers_p = layers_p+'"+layers_p+"' membership_num='"+parent_cod+"'";         int pers_points = st.executeupdate(personal_po);         int first_lyr = st.executeupdate(first_layer);         string layers="select membership_num customers parent_num='"+parent_cod+"'" ;         // want update values comes these resultset         resultset rs = st.executequery(layers);          while(rs.next()){        string names =rs.getstring(1);         string update_layers = "update customers set layers_p = layers_p + '"+layers_p+"' membership_num='"+names+"'  ";         int  nms = st.executeupdate(update_layers);

you should change these lines: 

string personal_po = "update customers set personal_p =personal_p + '"+personal_p+"' membership_num='"+cust_code+"'  "; string first_layer="update customers set layers_p = layers_p+'"+layers_p+"' membership_num='"+parent_cod+"'"; string update_layers = "update customers set layers_p = layers_p + '"+layers_p+"' membership_num='"+names+"'  ";

replacing:
...set xxxxx_p = xxxxx_p + '" + xxxxx_p + "'... with
...set xxxxx_p = '" + xxxxx_p + "'....

update:
also, don't use same statement updates, while still reading resultset.

... statement st2 = con.createstatement(); while(rs.next()){     ...     int  nms = st2.executeupdate(update_layers); } ...

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