We Keep Coding

No suitable driver found for jdbc:mysql//localhost/sakila

I'm trying to set up JDBC but I'm getting this error.
I tried adding the dependency in pom.xml and even jar file nothing works. I tried the methods mentioned in previous questions, nothing works.
public class FilmLength {
public static void main(String[] args) throws SQLException {
Connection dbCon = null;
PreparedStatement st = null;
ResultSet rs = null;
String url = "jdbc:mysql//localhost:3306/sakila";
String username = "devuser";
String password = "Demo#123";
String query = "select * from film ";
try {
Class.forName("com.mysql.jdbc.Driver");
dbCon = DriverManager.getConnection(url,username,password);
st = dbCon.prepareStatement(query);
rs = st.executeQuery();
while(rs.next()) {
String title = rs.getString(1);
System.out.println(title);
}
} catch (Exception e) {
e.printStackTrace();
}
finally {
dbCon.close();
st.close();
rs.close();
}
}
}

Instead of
String url = "jdbc:mysql//localhost:3306/sakila";
it should be
String url = "jdbc:mysql://localhost:3306/sakila";

Using two combobox to set conditions for a search in a database and displaying in jtable

I need to display the details of students in a particular stream of a schoolclass in Jtable from a database containing all the names of students in the school. I have two jComboboxes, on to select which class and the other to select the stream. I am asking for a way to define these two conditions in order to display all the students in a particular stream in a jtable. I apologize in advance if my code is messy.
public Classes() {
initComponents();
show_student();
}
public Connection getConnection() {
Connection con = null;
try {
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sms", "root", "");
} catch(Exception e) {
JOptionPane.showMessageDialog(null, e.getMessage());
}
return con;
}
public ArrayList<Individualclass> studentList(String ValToSearch) {
ArrayList<Individualclass> list = new
ArrayList<Individualclass>();
Statement st;
ResultSet rs;
try {
Connection con=getConnection();
st = con.createStatement();
String searchQuery = "SELECT * FROM `students` WHERE CONCAT(`firstName`, `surname`, `otherNames`, `regNo`) LIKE '%"+ValToSearch+"%'";
rs = st.executeQuery("searchQuery ");
Individualclass ic;
while(rs.next()) {
ic = new Individualclass(
rs.getString("firstName"),
rs.getString("surname"),
rs.getString("otherNames"),
rs.getInt("regNo")
);
list.add(ic);
}
} catch(Exception ex){
JOptionPane.showMessageDialog(null, ex.getMessage());
}
return list;
}
public void findStudents() {
}
private void sClassActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_sClassActionPerformed
try {
Connection con = getConnection();
String fetch_row = "SELECT * FROM students where sClass=?";
PreparedStatement pst = con.prepareStatement(fetch_row);
pst.setString(1, (String) sClass.getSelectedItem());
ResultSet rs = pst.executeQuery();
while(rs.next()) {
Individualclass ic = new Individualclass(rs.getString("firstName"),rs.getString("surname"),rs.getString("otherNames"),rs.getInt("regNo"));
}
} catch(Exception ex) {
JOptionPane.showMessageDialog(null, ex.getMessage());
}
}//GEN-LAST:event_sClassActionPerformed
private void streamActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_streamActionPerformed
try {
Connection con = getConnection();
String fetch_row = "SELECT * FROM students where stream=?";
PreparedStatement pst = con.prepareStatement(fetch_row);
pst.setString(1, (String)stream.getSelectedItem());
ResultSet rs = pst.executeQuery();
while(rs.next()) {
Individualclass ic = new Individualclass(rs.getString("firstName"),rs.getString("surname"),rs.getString("otherNames"),rs.getInt("regNo"));
}
} catch(Exception ex) {
JOptionPane.showMessageDialog(null, ex.getMessage());
}
}//GEN-LAST:event_streamActionPerformed
public void show_student() {
ArrayList<Individualclass> list = new ArrayList<Individualclass>();
DefaultTableModel model = (DefaultTableModel)jTable_Display_Student.getModel();
Object [] row = new Object[13];
for(int i = 0; i < list.size(); i++) {
row[0] = list.get(i).getFirstName();
row[1] = list.get(i).getsurname();
row[2] = list.get(i).getOtherNames();
row[3] = list.get(i).getregNo();
model.addRow(row);
}
}

Ambiguous behavior of ResultSet

I have a requirement to create separate POJO which will set/get sql ResultSet and use its methods throughout my project code like below. I have created below 2 classes
public class Tester3
{
public MyResultSet test() throws SQLException{
MyResultSet mrs = new MyResultSet();
PreparedStatement ps = null;
String values = null;
boolean flag = false;
String one = "'12'";
String two = "'jt'";
String a = null;
String b = null;
try {
if(flag==true)
{
values = "'3%'";
a =null;
b = "OR id IN(\'" +a+ "\')";
}else
{
values = "'%'";
a = one + "," + two;
b = "AND id IN("+a+")";
}
String sql = "SELECT * FROM veracodetable where orts like PARAM RAMAN";
sql = sql.replaceFirst("PARAM", values);
sql = sql.replaceFirst("RAMAN", b);
System.out.println("SQL: "+sql);
ps = new Connection1().getConnection().prepareStatement(sql);
ps.executeQuery();
mrs.setRs(ps.executeQuery());
System.out.println("ResultSet: "+mrs.getRs().next());
} catch (SQLException e) {
e.printStackTrace();
}
return mrs;
}
public static void main(String[] args) throws SQLException {
Tester3 t = new Tester3();
MyResultSet rs = t.test();
System.out.println("ResultSet: "+rs.getRs().next());
}
}
public class MyResultSet {
ResultSet rs = null;
public ResultSet getRs() {
return rs;
}
public void setRs(ResultSet rs) {
this.rs = rs;
}
}
When executed above code with separate POJO MyResultSet, I don't get any result in ResultSet. However if I skip POJO implementation and use resultSet directly, I am able to get results.
Is rs.getRs() invoking at all? If not, why?

I would separate the statements as they dont't perform the same function, and then populate;
PreparedStatemet ps = null;
ResultSet rs = null;
if(flag){
String stmt = "...?...?";
ps = con.preparedStatement(stmt);
ps.setString(0,a);
ps.setString(1,b);
rs = ps.executeQuery;
}else{
String stmt = "...?...?";
ps = con.preparedStatement(stmt);
ps.setString(0,a);
ps.setString(1,b);
rs = ps.executeQuery;
}
}

Could not load create coonection in addProduct method

package com.Foodmart;
import javax.jws.*;
import java.sql.*;
#WebService(name = "FoodMart", serviceName = "FoodMartService", portName = "FoodMartHtt)
public class FoodmartWS {
ProductDetails prod = new ProductDetails();
#WebMethod(operationName = "check")
public boolean Authenticate(String user, String pass) {
PreparedStatement psmt = null;
Connection c = null;
try {
c = ConnectionDB.getConnection();
String selectSQL = "select * from Employee where Username=? and Password=?";
psmt = c.prepareStatement(selectSQL);
psmt.setString(1, user);
psmt.setString(2, pass);
psmt.executeQuery();
c.close();
return true;
} catch (SQLException e) {
return false;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
In this Method Error in AddProduct
#WebMethod(operationName = "AddProduct")
public ProductDetails ProdcutAdd(int prodid, double qty) {
PreparedStatement preparedStatement = null;
Connection con = null;
try {
System.out.println("try");
//here i am not able to create another one connection
con = ConnectionDB.getConnection();
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/Food", "root", "manager1");
String selectSQL = "select Product_Id,Product_Name,Product_Price,Product_Qty from Products where Product_Id=?;";
System.out.println("bbefore prepared");
preparedStatement = con.prepareStatement(selectSQL);
preparedStatement.setInt(1, prodid);
System.out.println("before result set");
ResultSet rs = preparedStatement.executeQuery();
System.out.println("query Executed");
rs.next();
prod.setProductId(rs.getInt("Product_Id"));
prod.setProductName(rs.getString("Product_Name"));
prod.setProductPrice(rs.getDouble("Product_Price"));
prod.setProductQty(rs.getInt("Product_Qty"));
System.out.println("obj set");
con.close();
System.out.println("in" + prod);
return prod;
} catch (SQLException e) {
System.out.println(e);
return null;
} catch (Exception e) {
throw new RuntimeException(e);
}
}

Why you add this line after you get your connection :
con = ConnectionDB.getConnection();
//con = DriverManager.getConnection("jdbc:mysql://localhost:3306/Food", "root", "manager1");
So just delete it or comment it.
Note
you missed a ") here in the end, so this can also make a problem :
#WebService(name = "FoodMart", serviceName = "FoodMartService", portName = "FoodMartHtt)
Hope this can help you.

getting values in jtable upon seletio on jcombox

1.i have a jcombobox which is getting the value from database ,
2. upon the selection on the value i want to display that particular row in the jtable ,
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
Object obj = jComboBox1.getSelectedItem();
String tmpr = obj.toString();
Rtable rObj = new Rtable();
rObj.setUserName(tmpr);
}
private void Update_table(){
String Sql = "SELECT * FROM r_db1.dbo.user_names " + jComboBox1.getSelectedItem()
I am getting a error like "UnsupportedOperationException("Not supported yet.")"

Try this
use loadcombo() method to load ur jcombobox.
void loadcombo()
{
try
{
Connection con=null;
Statement st=null;
ResultSet rs=null;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url=null,userID=null,password=null;
String dbFileName=null;
String sql=null;
dbFileName = "C:/db.accdb";
//userID = "Admin";
password = "***";
url = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};"+
"DBQ="+dbFileName+";"+
"Pwd="+password+";";
//sql = "SELECT * FROM tblUserProfile";
con=DriverManager.getConnection(url);//,"system","manager"
//con=DriverManager.getConnection("jdbc:odbc:shop","system","manager");
st=con.createStatement();
rs= st.executeQuery("select distinct(Name) from Table");
while(rs.next())
{
jComboBox.addItem(rs.getString(1));
}
st.close();
con.close();
}
catch(Exception e)
{
System.out.println("GG"+e);
}
}
use jcombobx actionlistener to load data into jtable.
jComboBox.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
try
{
Connection con=null;
Statement st=null;
ResultSet rs=null;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url=null,userID=null,password=null;
String dbFileName=null;
String sql=null;
dbFileName = "C:/db.accdb";
url = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};"+
"DBQ="+dbFileName+";";
//sql = "SELECT * FROM tblUserProfile";
Object name=jComboBox.getSelectedItem();
con=DriverManager.getConnection(url);//,"system","manager"
//con=DriverManager.getConnection("jdbc:odbc:shop","system","manager");
st=con.createStatement();
model.setRowCount(0);
data = getvalue(name);
JTable table1=new JTable(data,header);
for(int i=0;i<table1.getRowCount();i++){
Object[] d={data.get(i).get(0),data.get(i).get(1),data.get(i).get(2)};model.addRow(d);
}
con.close();
}
catch(Exception e)
{
System.out.println("GG"+e);
}
}
public Vector getvalue(Object name)throws Exception
{
Vector<Vector<String>> vector = new Vector<Vector<String>>();
Connection conn = dbConnection();
PreparedStatement pre = conn.prepareStatement("select * from Table where Name='"+name+"'");
ResultSet rs = pre.executeQuery();
while(rs.next())
{
Vector<String> c = new Vector<String>();
c.add(rs.getString(4));
c.add(rs.getString(5));
c.add(rs.getString(6));
vector.add(c);
}
/*Close the connection after use (MUST)*/
if(conn!=null)
conn.close();
return vector;
}
});