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| package test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.SQLException;
import java.sql.ResultSet;
public class DataBase {
private Connection connection;
private Statement statement;
private ResultSet resultSet;
private String login = null;
private String password = null;
private String[] usersList = null;
private int numberOfUsers = 0;
private String[] chatRoomsList = null;
private String chatRoom = null;
private String query = null;
private String tableName = "users";
public DataBase(String driver, String url, String dataBaseUserName, String dataBaseUserPassword) {
try {
Class.forName(driver);
connection = DriverManager.getConnection(url, dataBaseUserName, dataBaseUserPassword);
statement = connection.createStatement();
}catch(ClassNotFoundException e) {
System.out.println("Error when loading the driver : " + e.toString());
}catch(SQLException e) {}
}
public void createTable(String tableName) {
//vérifier ici si la table existe
this.tableName = tableName;
query = "CREATE TABLE " + tableName +
"(login VARCHAR(30) not null, " +
"password VARCHAR(30) not null, " +
"PRIMARY KEY (login))";
try {
statement.executeUpdate(query);
}catch(SQLException e) {}
}
public void useTable(String tableName) {
this.tableName = tableName;
}
public void addUser(String login, String password) {
query = "INSERT INTO " + tableName + " VALUES ('" + login + "', '" + password + "')";
try {
statement.executeUpdate(query);
}catch(SQLException e) {}
}
public void deleteUser(String login) {
query = "DELETE FROM " + tableName + " WHERE login='" + login + "'";
try {
statement.executeUpdate(query);
}catch(SQLException e) {}
}
public String[] getUsersList() {
int i = 0;
query = "SELECT login FROM " + tableName;
try {
resultSet = statement.executeQuery(query);
while(resultSet.next()) {
usersList[i] = resultSet.getString(1);
i++;
}
}catch(SQLException e) {}
numberOfUsers = i;
return usersList;
}
/*public boolean isRegistered(String login) {
try {
statement.executeQuery(query);
}catch(SQLException e) {}
}
public boolean isAuthentificationOk(String login, String password) {
try {
statement.executeUpdate(query);
}catch(SQLException e) {}
}*/
public String getLogin() {
return login;
}
public String getPassword() {
return password;
}
public int getNumberOfUsers() {
return numberOfUsers;
}
public void addChatRoom(String chatRoom) {
query = "INSERT INTO " + tableName + " VALUES ('" + chatRoom + "')";
try {
statement.executeUpdate(query);
}catch(SQLException e) {}
}
public void deleteChatRoom(String chatRoom) {
query = "DELETE FROM " + tableName + " WHERE chatRoom='" + chatRoom + "'";
try {
statement.executeUpdate(query);
}catch(SQLException e) {}
}
/*public String[] getChatRoomList() {
}
public boolean isExisting(String chatRoom) {
try {
statement.executeUpdate(query);
}catch(SQLException e) {}
}*/
public String getChatRoom() {
return chatRoom;
}
public void closeStatement() {
try {
statement.close();
}catch(SQLException e) {}
}
public void closeConnection() {
try {
connection.close();
}catch(SQLException e) {}
}
public static void main(String[] args) throws Exception {
DataBase dataBase = new DataBase("com.mysql.jdbc.Driver", "jdbc:mysql://localhost/chat", "chat", "azerty");
dataBase.useTable("users");
String users[] = dataBase.getUsersList();
for(int i = 0; i < dataBase.getNumberOfUsers(); i++) {
System.out.println(users[i]);
}
dataBase.closeStatement();
dataBase.closeConnection();
}
} |
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