i want to use the string input in textfield in JFrame form as a part of my sql query in java.
For example if i input a name in textfield, i want the sql query to use that name and give the relevant data and not the data of entire table. Like "select * from *table_name* where name = *textfield_input* ;"
following is the code that i'm using to get the data of the entire table.
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
DefaultTableModel model = (DefaultTableModel)p1.getModel();
try{
Class.forName("java.sql.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/ritick","root", "iit2012054");
Statement st = con.createStatement();
String query = "select * from student;";
ResultSet rs = st.executeQuery(query);
while(rs.next()){
String d1 = rs.getString("roll_no");
String d2 = rs.getString("name");
String d3 = rs.getString("dept");
String d4 = rs.getString("cgpa");
model.addRow(new Object[]{d1,d2,d3,d4});
}
rs.close();
st.close();
con.close();
}
catch (Exception e){
JOptionPane.showMessageDialog(this, "error in connectivity !");
}
// TODO add your handling code here:
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
DefaultTableModel model = (DefaultTableModel)p2.getModel();
try{
Class.forName("java.sql.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/ritick","root", "iit2012054");
Statement st = con.createStatement();
String query = "show databases;";
ResultSet rs = st.executeQuery(query);
while(rs.next()){
String d1 = rs.getString("database");
model.addRow(new Object[]{d1});
}
rs.close();
st.close();
con.close();
}
catch (Exception e){
JOptionPane.showMessageDialog(this, "error in connectivity !");
}
}
This might help Try to use the PreparedStatement so that
Query is "select * from student where name = ?"
From the statement setString(1, String)
Related
I am trying to check if a specific row exists in a table that includes two given parameters: record_id and modifiedDate. So far my code does not work.
public void doSomething(int RECORD_ID) {
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = new Date();
String modifiedDate = dateFormat.format(date);
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/db", "user", "pass");
Statement stmt = connection.createStatement();
String checkIfInDB = "select exists(select * from table where reference = ${RECORD_ID} and creation_date = '${modifiedDate}');"
ResultSet rs = stmt.executeQuery(checkIfInDB);
if(rs.next()) {
println "Query in db"
stmt.close();
connection.close();
return;
}
else {
String command = "INSERT INTO table(reference, creation_date) VALUES (${RECORD_ID}, '${modifiedDate}');"
stmt.executeUpdate(command)
println "Success"
stmt.close();
connection.close();
return;
}
}
If the user inserts a RECORD_ID and date that already exists, the program adds it to the table anyway, when it should print 'Query in db'.
I would appreciate any help to solve this issue.
Rather than listing what was wrong with the provided code I offer an example of a working example that could be used to help you along your journey...
public static void main(String[] args) {
int recordId = 1;
String jdbcSource = "jdbc:mysql://localhost:####/";
String user = "****";
String password = "****";
String checkIfInDB = "select count(*) as cnt from example_schema.example_table where example_table.reference = ? and example_table.creation_date = ?";
try (Connection connection = DriverManager.getConnection(jdbcSource, user, password)) {
PreparedStatement stmt = connection.prepareStatement(checkIfInDB);
stmt.setInt(1, recordId);
stmt.setDate(2, java.sql.Date.valueOf(LocalDate.now()));
ResultSet rs = stmt.executeQuery();
if (rs.next()) {
System.out.println("at least one row matched");
return;
} else {
// to-do implement insert statement
return;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
I have tried to use another proyect and the connection is succesfull but from this proyect I am only able to connect to localhost mysql. I want it to work only on lan.
I am getting "Access denied for user 'root'#'192.168.1.70' (using password: YES)"
Code sample from not working proyect:
Connection con = null;
Statement st = null;
ResultSet rs = null;
try{ con = (Connection) DriverManager.getConnection("jdbc:mysql://"+home.credentials[0],home.credentials[1],home.credentials[2]);
st = (Statement) con.createStatement();
String s = "SELECT * FROM meta";
rs = st.executeQuery(s);
ResultSetMetaData rsmt = rs.getMetaData();
while(rs.next()){
int meta = rs.getInt("meta");
goal.setText(Integer.toString(meta));
}
}catch(Exception e){}
finally{
try{ st.close();
rs.close();
con.close();
}
catch(Exception e){ JOptionPane.showMessageDialog(null, "Información no encontrada");
}
}
Code sample from another proyect which connects succesfully
try
{
// create our mysql database connection
String myDriver = "org.gjt.mm.mysql.Driver";
String myUrl = "jdbc:mysql://192.168.1.66:3306/jjeventoscore";
Class.forName(myDriver);
Connection conn = (Connection) DriverManager.getConnection(myUrl, "root", "");
// our SQL SELECT query.
// if you only need a few columns, specify them by name instead of using "*"
String query = "SELECT * FROM client";
// create the java statement
Statement st = (Statement) conn.createStatement();
// execute the query, and get a java resultset
ResultSet rs = st.executeQuery(query);
// iterate through the java resultset
while (rs.next()){
String name = rs.getString("name");
String last = rs.getString("last");
String h_phone = rs.getString("h_phone");
String m_phone = rs.getString("m_phone");
String of_phone = rs.getString("of_phone");
String ex_phone = rs.getString("ex_phone");
String email = rs.getString("email");
String medium = rs.getString("medium");
System.out.println(name+" "+last);
}
st.close();
}
catch (Exception e)
{
System.err.println("Got an exception! ");
System.err.println(e.getMessage());
}
}
You need to give privileges to the user on that Database and that Table.
With privileges, on your MySQL instance:
USE jjeventoscore;
GRANT ALL ON jjeventoscore.* TO 'root'#'192.168.1.70';
Or maybe try
GRANT ALL ON jjeventoscore.* TO 'root'#'192.168.1.70' IDENTIFIED BY '';
Since it says "Using password: YES"
Also, check the password on MySQL. It should match the parameter in this function
Connection conn = (Connection) DriverManager.getConnection(myUrl, "root", "");
Good day ,
While I am trying to update data after inserting new ones in the database,
This message is showing for me
can not issue executeupdate() for selects
I have checked tutorialspoint.com and codejava and the codes for both update and select are the same and the program is issuing the statement above
Here is my codes
String Sql="Select * from training where trainID=? ";
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/hr","root","MZaa8891#");
ps= con.prepareStatement(Sql);
ps.setString(1, jTextField1.getText());
rs =ps.executeQuery();
while (rs.next()){
jTextField2.setText(rs.getString("traTitle"));
}
}
catch (Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
String Sql="Select * from training where traTitle =? ";
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/hr","root","MZaa8891#");
ps= con.prepareStatement(Sql);
ps.setString(1, jTextField1.getText());
rs =ps.executeQuery();
while (rs.next()){
jTextField2.setText(rs.getString("trainID"));
}
}
catch (Exception e){
JOptionPane.showMessageDialog(null, e);
}
String Sql= "UPDATE training SET traTitle ='"+ jTextField2.getText()+"', Type = "+(String) jComboBox1.getSelectedItem()+"', SDate = '"+sqlDate+"', Edate = '"+sqlDate2+"', location = '"+jTextField3.getText()+"',provider = '"+(String) jComboBox1.getSelectedItem()+"',related = '"+jTextArea1.getText()+"',benefits = '"+jTextArea2.getText()+"'important = '"+jTextArea3.getText()+"' WHERE trainID = "+jTextField1.getText()+"";
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/hr","root","MZaa8891#");
Statement st = con.createStatement();
int i =ps.executeUpdate();
if (i>0)
{
JOptionPane.showMessageDialog(null, "Data is Saved");
}
else {
JOptionPane.showMessageDialog(null, "Data is not Saved");
}
}
catch (Exception e){
JOptionPane.showMessageDialog(this, e.getMessage());
JOptionPane.showMessageDialog(null, e);
}
Any Solution ?
Statement st = con.createStatement();
int i = ps.executeUpdate();
The problem is here. You are creating a new, unused, Statement, and then trying to call executeUpdate() on the previously prepared statement, which was a SELECT.
This would have been avoided by correctly scoping the variables concerned as method-local. None of them should be instance or static members.
I want to remove the data in database from jtable. I have 1 jTextField and 1 jButton. So when i click this selected row in table, the primary key wont set in my jTextField.
Is it possible to remove the data in database from jtable without jTextField and just a button?
Heres my code
try {
int row = table.getSelectedRow();
String id_ = (table.getModel().getValueAt(row, 1)).toString();
String sql ="SELECT id FROM 'mycredentials.sales' WHERE id= "+id_+"'";
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mycredentials?autoReconnect=true&useSSL=false", username, password);
PreparedStatement pst = (PreparedStatement) connection.prepareStatement(sql);
ResultSet rs = pst.executeQuery();
while (rs.next()) {
jFrame_removeP.setText(rs.getString("id"));
}
} catch (SQLException e1) {
System.err.println(e1);
}
Random id number appears in my jTextField. And my table code is:
String name = jFrame_pName.getText().trim();
String price = jFrame_pPrice.getText().trim();
String quantity = jFrame_quantity.getText().trim();
String total = jFrame_total.getText().trim();
String st[] = {name, price, quantity, total};
model.addRow(st);
jFrame_gTotal.setText(Integer.toString(getSum()));
try {
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mycredentials?autoReconnect=true&useSSL=false", username, password);
Statement s = (Statement) connection.createStatement();
String sql = "INSERT INTO mycredentials.sales (name, price, quantity, total) VALUES ('"+jFrame_pName.getText()+"', '" + jFrame_pPrice.getText() + "','"+jFrame_quantity.getText()+"','"+jFrame_total.getText()+"')";
s.executeUpdate(sql);
} catch (SQLException e1) {
System.err.println(e1);
}
And my remove button is:
DefaultTableModel model1 = (DefaultTableModel) table_1.getModel();
int selectedRowIndex = table_1.getSelectedRow();
model1.removeRow(selectedRowIndex);
try {
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mycredentials?autoReconnect=true&useSSL=false", username, password);
Statement ps = (Statement) connection.createStatement();
String sql = "DELETE from mycredentials.sales where id ='" + jFrame_removeP.getText() + "'";
ps.executeUpdate(sql);
} catch (Exception ex) {
System.err.println(ex);
}
Do you mean like this? I didn't get exactly what you needed. Hope this helps.
private void deleteBtnActionPerformed(java.awt.event.ActionEvent evt) {
String deleteQuery = "DELETE FROM SAMPLE WHERE USER_ID = ?";
try (Connection myCon = DBUtilities.getConnection(DBType.JDBC);
PreparedStatement myPs = myCon.prepareStatement(deleteQuery);){
myPs.setInt(1,userID);
myPs.executeUpdate();
JOptionPane.showMessageDialog(null,"Records deleted");
}//end of try
catch (SQLException ex) {
DBUtilities.processException(ex);
}//end of catch
}
After search a record. You just click a record in the Jtable you want to delete. And just hit the Delete Button simple as that.
Just use a refresh method here if you want to remove the selected row. Fix your statement much better if you use Prepared Statement than Statements to avoid SQL injection.
hi every one i have write program that connect to database i create jTextField and jTable my question is how i can use the jTextField to serch in database and view in jTable the code i try is below
try{
String host = "jdbc:derby://localhost:1527/PROCAT";
String uName = "zain";
String uPass = "zain";
Connection con = DriverManager.getConnection( host, uName, uPass);
String sql = "Select * from ITEMB where ITEM '"+asdf.getText()+"'";
stmt = con.createStatement();
rs = stmt.executeQuery(sql);
while (rs.next()) {
String pr = rs.getString("PRISE");
String it= rs.getString("ITEMNAME");
String itm = rs.getString("ITEM");
String[] data = {pr, it, itm};
tabMode.addRow(data);
double price = Double.parseDouble(rs.getString("prise"));
totalpay = price + totalpay;
++rowCount;
}
}
catch (Exception e) {
//ignore
}
jTextField3.setText(String.valueOf(totalpay));
}
Don't ignore the Exception. How to you expect to debug your SQL if you don't display error messages???
I would guess the problem is you are missing an "=" from your select statement (ie. "ITEM = asdf.getText()").
However, the better way to use SQL is to use a PreparedStatement so you don't have to worry about all the delimiters. So the SQL might be something like:
String sql = "Select * from ITEMB WHERE ITEM = ?";
PreparedStatement stmt = connection.prepareStatement(sql);
stmt.setString( 1, asdf.getText() );
stmt.executeQuery();
stmt.close();
It is much easier to read an maintain.