Я пытаюсь получить jdbc Connection, но по какой-то причине выдается сообщение об ошибке «Драйвер не найден». Используемая база данных - H2. вот код:
import com.userManagement.model.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import com.userManagement.model.User;
public class UserDao {
private String jdbcUrl="jdbc:h2:tcp://localhost/~/userManagement";
private String username="user";
private String password="user";
private static final String insertIntoUsers="insert into users"+"(name,address,age,email)values"+"(?,?,?,?);";
private static final String selectUserById="select * from users where id=?";
private static final String deleteUser="delete from users where id=?";
private static final String updateUser="update * from users where id=?";
private static final String selectAllUsers="select * from users";
//getting jdbc connection and returning it.
protected Connection getConnection() {
Connection con=null;
try {
con=DriverManager.getConnection(jdbcUrl, username, password);
}
catch(Exception e) {
e.printStackTrace();
}
return con;
}
public void insertUser(User user) {
try(Connection con=getConnection();
PreparedStatement pst=con.prepareStatement(insertIntoUsers)){
pst.setString(1, user.getName());
pst.setString(2, user.getAddress());
pst.setInt(1, user.getAge());
pst.setString(1, user.getEmail());
pst.executeUpdate();
}
catch(Exception e) {
}
}
public User selectUser(int id) {
User user=null;
try(Connection con=getConnection();
PreparedStatement pst=con.prepareStatement(selectUserById)){
pst.setInt(1,id);
ResultSet rs=pst.executeQuery();
while(rs.next()) {
String name=rs.getString("name");
String address=rs.getString("address");
int age=rs.getInt("age");
String email=rs.getString("email");
user=new User(name,address,age,email);
}
}
catch(Exception e) {
e.printStackTrace();
}
return user;
}
public List<User> selectAllUser(){
List <User> users=new ArrayList<> ();
try(Connection con=getConnection();
PreparedStatement pst=con.prepareStatement(selectAllUsers);){
ResultSet rs=pst.executeQuery();
while(rs.next()) {
String name=rs.getString("name");
String address=rs.getString("address");
int age=rs.getInt("age");
String email=rs.getString("email");
users.add(new User(name,address,age,email));
}
}
catch(Exception e) {
e.printStackTrace();
}
return users;
}
public boolean deleteUser(int id) {
boolean rowDeleted=false;
try(Connection con=getConnection();
PreparedStatement pst=con.prepareStatement(deleteUser)){
pst.setInt(1, id);
rowDeleted=pst.executeUpdate()>0;
}
catch(Exception e) {
e.printStackTrace();
}
return rowDeleted;
}
public boolean updateUser(User user) {
boolean rowUpdated=false;
try(Connection con=getConnection();
PreparedStatement pst=con.prepareStatement(updateUser)){
pst.setString(1,user.getName());
pst.setString(2, user.getAddress());
pst.setInt(2, user.getAge());
pst.setString(2, user.getEmail());
rowUpdated=pst.executeUpdate()>0;
}
catch(Exception e ) {
e.printStackTrace();
}
return rowUpdated;
}
}