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how to get data from result set by selecting multiple table record using JDBC?

I am trying to get data using result set from multiple tables which throw exception.
java.sql.SQLException: Invalid column name.
public void test(String code) {
String sql = "select * from table1 ,table2 where table1.code = table2.code and table.code='" + code + "'";
try (PreparedStatement pst = conn.prepareStatement(sql); ResultSet rs = pst.executeQuery()) {
while (rs.next()) {
System.out.println(rs.getString("table1.code"));
}
} catch (SQLException ex) {
Logger.getLogger(FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex);
}
}
using this statement it's work find but it's take more time to every individual column and it's bad practice.
select table1.code as code,table1.name as name ....,table2.code as
tbl2Code,... where table1.code=table2.code;

How to remove data in database from jTable?

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.

Getting all data between 2 days in MySql Java

I want to select all data from database table between given 2 specific dates and add that data to a jtable.
Below is my code to retrieve data from the database; But all the data is not shown by this code .. What is the error I done here?
private void updateTable(){
String fday = ((JTextField)day_chooser.getDateEditor().getUiComponent()).getText();
String tday = ((JTextField)day_chooser.getDateEditor().getUiComponent()).getText();
try {
String sql = "SELECT * FROM saleinfo WHERE SaleDate BETWEEN '"+fday+"' AND '"+tday+"'";
pst=conn.prepareStatement(sql);
rs=pst.executeQuery();
tbl.setModel(DbUtils.resultSetToTableModel(rs));
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "Error : "+ex);
}
}

Leverage the JDBC drive and it's ability to map between data types from Java to the database, leverage the power of the PreparedStatement
I'm using prepared statements pst is the prepare statement
BUT, you're not using it properly, see Using Prepared Statements for more details.
Start by getting the Date value from the date picker (I'm guessing here, but I assume they have some kind of getDate method) and then bind the values to the wildcard columns of the query, for example...
Date fday = day_chooser.getDate();
Date tday = day_chooser.getDate();
try {
String sql = "SELECT * FROM saleinfo WHERE SaleDate BETWEEN ? AND ?";
try (PreparedStatement pst = conn.prepareStatement(sql)) {
pst.setDate(1, new java.sql.Date(fday.getTime()));
pst.setDate(2, new java.sql.Date(tday.getTime()));
try (ResultSet rs = pst.executeQuery()) {
tbl.setModel(DbUtils.resultSetToTableModel(rs));
}
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "Error : " + ex);
ex.printStackTrace();
}
Don't assume anything about the format, this will just cause you no end of grieve if you ever have to change databases

Updating database from a dynamic jtable

I am trying to update a database from a dynamic JTable. Here is my code
try {
//open connection...
conn = javaConnect.ConnectDb();
//select the qualifications table row for the selected staffID
String sql2 = "select * from QualificationsTable where qualID =" + theRowID;
pStmt = conn.prepareStatement(sql2);
ResultSet rs2 = pStmt.executeQuery();
//check if QualificationsTable has content on that row...
if (rs2.next()) {
//it has content update...
//get the model for the qual table...
DefaultTableModel tModel = (DefaultTableModel) qualTable.getModel();
for (int i = 0; i < tModel.getRowCount(); i++) {
//get inputs from the tables
String qualification = tModel.getValueAt(i, 0).toString();
String yearAttained = tModel.getValueAt(i, 1).toString();
//sql query for updating qualifications table...
String sql3 = "update QualificationsTable set qualifications = ?, yearAttained = ? where qualID = ?";
pStmt = conn.prepareStatement(sql3);
//set the pareameters...
pStmt.setString(1, qualification);
pStmt.setString(2, yearAttained);
pStmt.setInt(3, theRowID);
//execute the prepared statement...
pStmt.execute();
// dbStatement.executeUpdate("INSERT INTO tableName VALUES('"+item+"','"+quant+"','"+unit+"','"+tot+"')");
}
//close connection
conn.close();
JOptionPane.showMessageDialog(null, "Qualifications updated successfully!", "Success", INFORMATION_MESSAGE);
} else {
//it doesnt have content insert...
//get the model for the qual table...
DefaultTableModel tModel = (DefaultTableModel) qualTable.getModel();
for (int i = 0; i < tModel.getRowCount(); i++) {
//System.out.println(tModel.getSelectedColumn()+tModel.getSelectedRow());
//get inputs from the tables
String qualification = tModel.getValueAt(i, 0).toString();
String yearAttained = tModel.getValueAt(i, 1).toString();
//sql query for storing into QualificationsTable
String sql3 = "insert into QualificationsTable (qualifications,yearAttained,qualID) "
+ "values (?,?,?)";
pStmt = conn.prepareStatement(sql3);
//set the parameters...
pStmt.setString(1, qualification);
pStmt.setString(2, yearAttained);
pStmt.setInt(3, theRowID);
//execute the prepared statement...
pStmt.execute();
}
//close connection
conn.close();
JOptionPane.showMessageDialog(null, "Qualifications saved successfully!", "Success", INFORMATION_MESSAGE);
}
} catch (SQLException ex) {
Logger.getLogger(StoreInfo.class.getName()).log(Level.SEVERE, null, ex);
} catch(NullPointerException nfe){
JOptionPane.showMessageDialog(infoParentTab, "Please, always hit the Enter button to effect your changes on the table", "USER ERROR!", ERROR_MESSAGE);
}
} else {
JOptionPane.showMessageDialog(infoParentTab, "You must select a Staff from the Browser...", "USER ERROR!", ERROR_MESSAGE);
}
} catch (SQLException e) {
JOptionPane.showMessageDialog(null, e);
e.printStackTrace();
}
what i am actually trying to do is to use a table linked to a database to store qualifications of staff in a company. now each entry in the qualifications database is referenced to the staffID in the staffs database through qualID.
so when i store the qualification on the table, it also records the staff that has the qualification. this should enable me retrieve a particular staff's qualifications from the database when need.
the segment for inserting into the database if empty works fine (i.e. the else... segment). but the update segment (i.e. the if... segment) is faulty in the sense that the code uses the last row on the JTable to populate all the rows in the database table instead of replicating all the new changes into the database table when update is need.
i have tried everything i could to no avail. please i need much help in this...time is not on my side. tnx guys in advance

The best way to do this is to use a CachedRowSet to back up the JTable's model. You'll be able to view, insert and update data easily.
Here's the tutorial: Using JDBC with GUI API

Inserting email in SQLite database using JDBC

I am trying to insert an email ID to a table in my SQLite3 Database. In my case it successfully creates the table but gives an error while inserting a record in it - "near "#gmail": syntax error". How can i resolve this ? Here is the code -
public void insertData(String emailId, double gtse, long receivedDate) throws ClassNotFoundException, SQLException{
Class.forName("org.sqlite.JDBC");
Connection connection = null;
try
{
// create a database connection
connection = DriverManager.getConnection("jdbc:sqlite:testdb.sqlite");
Statement statement = connection.createStatement();
statement.setQueryTimeout(30); // set timeout to 30 sec.
ResultSet result = statement.executeQuery("SELECT name FROM sqlite_master WHERE type='table' AND name='T1'");
if(!result.next()){
statement.executeUpdate("create table T1 (email TEXT, gtse REAL, receiveddate DATE)");
statement.executeUpdate("insert into T1 values(" + emailId + ", "+ gtse +", "+ receivedDate +")");
}
else{
}
}
catch(SQLException e)
{
// if the error message is "out of memory",
// it probably means no database file is found
System.err.println(e.getMessage());
}
finally
{
try
{
if(connection != null)
connection.close();
}
catch(SQLException e)
{
// connection close failed.
System.err.println(e);
}
}
}

Your core error is that for the insert query you are not enclosing the values to be inserted, in quotes. Your query, after construction, looks something like this:
insert into T1 values(whatever#gmail.com, emailtexthere, 04-07-2013)
When it should be something like this:
insert into T1 values('whatever#gmail.com', 'emailtexthere', '04-07-2013')
The SQL parser chokes while trying to parse your current query, because the syntax is incorrect. The solution to this problem is not simply to enclose the values in quotes though, but rather to use prepared statements. This is because the way you are constructing your query right now is vulnerable to SQL injection attacks. Here is an example of using a prepared statement:
PreparedStatement pStmt = conn.prepareStatement(
"INSERT INTO T1 VALUES(?, ?, ?)");
pStmt.setString(1, emailId);
pStmt.setString(2, gtse);
pStmt.setDate(3, receivedDate);
pStmt.execute();