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Hi, I wanted to add a Password change function to my programm. For that i need to update the password column of the specific user. I researched about it and fount this and tried it:
UPDATE uprtable SET password = '"+password+"' WHERE username = '"+username+"';
I also found out that i need to select the row after it. So I did this too.
SELECT username, password FROM uprtable WHERE username '"+username+"';
The Problem is it doesnt update it and I dont get any Errors where I could get any Info about what is wrong.
Here is the Code direct from the Class:
public void changepw() throws Exception{
Connection con = getConnection();
String passwordID1 = String.valueOf((passwordfield.getPassword()));
String passwordID2 = String.valueOf((passwordfield2.getPassword()));
String passwordID3 = String.valueOf((passwordfield3.getPassword()));
if (passwordID1.equals(resultSet.getString("password"))) {
if (passwordID2.equals(passwordID3)) {
String userID = resultSet.getString("username");
try {
PreparedStatement statementpwchange = con.prepareStatement("UPDATE uprtable SET password = '"+passwordID2+"' WHERE username = '"+userID+"'");
PreparedStatement statementpwchangeconfirm = con.prepareStatement("SELECT username, password, rank FROM uprtable WHERE username = '"+userID+"'");
System.out.println("Updated");
frame.dispose();
}
catch(Exception e){
System.out.println(e);
}
}
else {
messageLabel.setForeground(Color.RED);
messageLabel.setText("The Passwords do not match");
}
}
}
If you need more Information about the Code, feel free to ask.
Thank you in advance!
You have prepared the statement but have not executed the statement. For reference: INSERT (as well as UPDATE and DELETE) statements should use executeUpdate().
SELECT statements should use executeQuery().
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I am trying to connect to SQL Server from an Android app and after days of struggling, I have finally figured it out. Now I have run into a much simpler problem. My select query only selects the last value from the table. The table only contains string values for now as it is a test table. Here is what I wrote in my code.
public void sqlButton(View view) {
if (connection != null) {
Statement statement = null;
try {
statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery("Select * from [dbo].[Table_1];");
while (resultSet.next()) {
textView.setText(resultSet.getString(1));
}
} catch (SQLException e) {
e.printStackTrace();
}
}
else {
textView.setText("Connection is null");
}
}
Your problem is probably that you're overwriting your output text each time.
Write this to a multiline text field, so you see all results:
textView.setText(textView.getText() + "\n" + resultSet.getString(1));
Actually, the select query returns all records in your table. However, the problem is in this part
while (resultSet.next()){ textView.setText(resultSet.getString(1));}
the text in the next loop will replace one in the previous. Therefore, you only see the last one.
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Closed 2 years ago.
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I started to work at my own Minecraft plugin. I need database connection to do so. I try to execute query and I get errors that I can't find solutions for.
Here is the code of function that I'm using:
public void checkIfUserExists(String login, Connection connection) {
String query = "SELECT login FROM edvault.users WHERE login = ?";
try {
PreparedStatement statement = connection.prepareStatement(query);
statement.setString(1, login);
ResultSet rs = statement.executeQuery();
if (!rs.next()){
String query2 = "INSERT INTO edvault.users (login) VALUES ?";
PreparedStatement statement2 = connection.prepareStatement(query2);
statement2.setString(1 , login);
int result = statement2.executeUpdate();
if (result != 1){
Bukkit.getConsoleSender().sendMessage(ChatColor.RED + "<DBINFO> ERROR OCCURRED WHILE INSERTING NEW USER" +
" TO DATABASE");
} else {
Bukkit.getConsoleSender().sendMessage(ChatColor.GREEN + "<DBINFO> ADDED NEW USER TO DATABASE : LOGIN - "+
login);
}
} else
Bukkit.getConsoleSender().sendMessage("<DBINFO> USER ALREADY EXISTS IN DATABASE");
} catch (SQLException e) {
e.printStackTrace();
}
}
And here is the exception that console returns to me (this is exception for the first query, where login is xEdziu):
[22:26:21] [Server thread/WARN]: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'xEdziu' in 'where clause'
Replace
INSERT INTO edvault.users (login) VALUES ?
with
INSERT INTO edvault.users (login) VALUES (?)
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Closed 5 years ago.
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I want to get some values from my database, but when I click button (void ButtonClick) my app crashes.
That's my code:
public void ButtonClick() throws Exception {
getConnection();
}
public Connection getConnection() throws Exception {
try {
String username = "*******";
String password = "*******";
String url = "jdbc:mysql://http://**.***.***.***:3306/UserDB";
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection conn = (Connection) DriverManager.getConnection(url,username,password);
Statement statement = (Statement) conn.createStatement();
String query = "SELECT * FROM TABLE 'UserDB'";
ResultSet result = statement.executeQuery(query);
while (result.next()) {
String name = result.getString("Username");
int id = result.getInt("ID");
int points = result.getInt("Points");
Toast.makeText(this, name + " " + id + " " + points, Toast.LENGTH_SHORT).show();
}
return conn;
} catch (Exception e) {
Toast.makeText(this, e.toString(), Toast.LENGTH_SHORT).show();
}
return null;
}
(I don't know what's the error because my AVD don't work)
Thanks for help!
Starting with Java 7, there is no need to use forName() method. You are creating a new instance in this way and in the same time you are trying to create a connection using DriverManager.getConnection().
So in order to solve this, just remove the instantiation of the driver using forName() method.
Seeing the screen-shot, please note that you can't access a MySQL database from Android natively. Actually you may be able to use JDBC, but it is not recommended. Please see this post
Hope it helps.
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Closed 7 years ago.
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I made a Java Forum and im trying to search my sql table, when i click the button to finally search it (the name of the person) it comes up with a "Invalid Operation at Current Cursor Position" error.
Here'e my code for the search button. Please help me figure this out.
private void firstSearchActionPerformed(java.awt.event.ActionEvent evt) {
try{
String fname = searchText.getText();
Connection connect = DriverManager.getConnection("jdbc:derby://localhost:1527/Employees",
"users", "admin");
PreparedStatement pState = connect.prepareStatement("select * from WORKERS where First_Name = ?");
pState.setString(1,fname);
ResultSet rSet;
rSet = pState.executeQuery();
if(rs.next()){
int id_col = rSet.getInt("Employee_ID");
String id = Integer.toString(id_col);
String first = rSet.getString("First_Name");
String last = rSet.getString("Last_Name");
String job = rSet.getString("Title");
String hireDate = rSet.getString("Hire_Date");
textID.setText(id);
textFirstName.setText(first);
textLastName.setText(last);
textTitle.setText(job);
textHireDate.setText(hireDate);
}else{
JOptionPane.showMessageDialog(null, "Not in Database");
}
}catch(SQLException err){
JOptionPane.showConfirmDialog(employees.this, err.getMessage());
}
}
ResultSet rSet;
rSet = pState.executeQuery();
instead of
if(rs.next()){
use
if(rSet.next()){
Here resultset object is rSet not rs
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Closed 8 years ago.
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I wrote some java code to insert data into SQL Server 2012's Database when the user presses a button. When I run the code, I get this error:
com.microsoft.sqlserver.jdbc.SQLServerException: Incorrect syntax near ','.
and it says that the sqlstatement.executeUpdate(); line caused the error. I know that this line is not a problem. The problem is my sql query but I cannot find how my query is wrong. Would you please help me?
Here the code
count++;
for(int count = 0; count < table_1.getRowCount(); count++){
try { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection dbconbt8 = DriverManager.getConnection("" +"jdbc:sqlserver://localhost;databaseName=Store;user=sa;password=XXXXXX");
String sqlQ = "INSERT INTO [dbo].[Transaction]([TransactionID],[ProductID]"+
",[TotalPrice]) VALUES ("+count+"','"+table_1.getValueAt(count, 0).toString()+"','"+sumprice+ "') ";
PreparedStatement sqlstatement = dbconbt8.prepareStatement(sqlQ);
sqlstatement.executeUpdate();
sqlstatement.close();
dbconbt8.close();
} catch (SQLException e1) {
e1.printStackTrace();
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
You are missing a single quote after VALUES ( - this should fix the problem:
String sqlQ = "INSERT INTO [dbo].[Transaction]([TransactionID],[ProductID]"+
",[TotalPrice]) VALUES ('"+count+"','"+table_1.getValueAt(count, 0).toString()+"','"+sumprice+ "') ";
-- ^
-- Here
However, this is a bad fix: you should rewrite your query with parameters, so that the problem of quoting the data becomes irrelevant altogether:
String sqlQ = "INSERT INTO [dbo].[Transaction]([TransactionID],[ProductID],[TotalPrice]) VALUES (?,?,?) ";
PreparedStatement sqlstatement = dbconbt8.prepareStatement(sqlQ);
sqlstatement.setInt(1, count);
sqlstatement.setString(2, table_1.getValueAt(count, 0).toString());
sqlstatement.setInt(3, sumprice);
sqlstatement.executeUpdate();