mysql - java - validate database with an array and execute after that -


i have code code show joptionpane "ga kenek" on second array

int rows = jtable1.getrowcount();         (int = 0; < rows; a++) {             string namaop = jtable1.getvalueat(a, 0).tostring();             string tgl = jtable1.getvalueat(a, 1).tostring();             string pn = jtable1.getvalueat(a, 2).tostring();             string nama = jtable1.getvalueat(a, 3).tostring();             string sql = "insert `tbl_coba`(`a`, `b`, `c`,`d`)"                     + " values ('" + namaop + "','" + tgl + "','" + pn + "','"+nama+"')";             string sql1="select `tbl_coba`";             try {                 statement st=con.createstatement();                 resultset rs=st.executequery(sql1);                 if (rs.next()) {                                             statement st1=con.createstatement();                     if (namaop.equals(rs.getstring("a"))) {//this why code skipped                         st1.executeupdate(sql);                         joptionpane.showmessagedialog(null, ""+namaop+"");                         st1.close();                     }else{                         joptionpane.showmessagedialog(null, "ga kenek");                     }                 }             } catch (sqlexception | headlessexception e) {                 system.out.println(sql);                 system.out.println(e.getmessage());                 joptionpane.showmessagedialog(null, "error!!!");             }         }joptionpane.showmessagedialog(null, "iki for"); 

i'm stuck on code because arrays executed on first array , code if (namaop.equals(rs.getstring("a"))) skipped


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