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Reading database data from more than two tables into a Swing table but the frame hangs indefinitely


Reading database data from more than two tables into a Swing table but the frame hangs indefinitely

By : woodenleaf
Date : November 18 2020, 03:49 PM
wish of those help Am trying to read database data into a Swing table from two database tables but the frame hands indefinitely. , try this code.I hope this working.
code :
PreparedStatement ps1 = c11.createConnection().prepareStatement("SELECT staff_id FROM staff");
ResultSet rst=ps1.executeQuery();
rst.last()
{
 stafid= rst.getString("staff_id");
}while(rst.previous());


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How to resize table of database in swing frame?

How to resize table of database in swing frame?


By : Krista Haldenwang
Date : March 29 2020, 07:55 AM
I wish this help you
But I want the size of the whole table to become approximately equal to the size of frame.
code :
JTable table = ...;
JFrame frame = ...;
JPanel contentPane = new JPanel( new BorderLayout() );
contentPane.add( new JScrollPane( table ), BorderLayout.CENTER );
frame.setContentPane( contentPane );
scipy.interpolate.LinearNDInterpolator hangs indefinitely on large data sets

scipy.interpolate.LinearNDInterpolator hangs indefinitely on large data sets


By : Chris F
Date : March 29 2020, 07:55 AM
To fix this issue The problem is most likely that your data set is simply too large, so that computing its Delaunay triangulation does not finish in an reasonable time. Check the time scaling of scipy.spatial.Delaunay using smaller data subsets randomly picked from your full data set, to estimate whether the full data set computation finishes before the universe ends.
If your original data is on a rectangular grid, such as
code :
v[i,j,k,l] = f(x[i], y[j], z[k], u[l])
import numpy as np
from scipy.interpolate import interp1d

def interp3(x, y, z, v, xi, yi, zi, method='cubic'):
    """Interpolation on 3-D. x, y, xi, yi should be 1-D
    and z.shape == (len(x), len(y), len(z))"""
    q = (x, y, z)
    qi = (xi, yi, zi)
    for j in range(3):
        v = interp1d(q[j], v, axis=j, kind=method)(qi[j])
    return v

def somefunc(x, y, z):
    return x**2 + y**2 - z**2 + x*y*z

# some input data
x = np.linspace(0, 1, 5)
y = np.linspace(0, 2, 6)
z = np.linspace(0, 3, 7)
v = somefunc(x[:,None,None], y[None,:,None], z[None,None,:])

# interpolate
xi = np.linspace(0, 1, 45)
yi = np.linspace(0, 2, 46)
zi = np.linspace(0, 3, 47)
vi = interp3(x, y, z, v, xi, yi, zi)

import matplotlib.pyplot as plt
plt.subplot(121)
plt.pcolor(xi, yi, vi[:,:,12])
plt.title('interpolated')
plt.subplot(122)
plt.pcolor(xi, yi, somefunc(xi[:,None], yi[None,:], zi[12]))
plt.title('exact')
plt.show()
How to insert data into swing table whose columns are dynamically defined (data from a mysql database)?

How to insert data into swing table whose columns are dynamically defined (data from a mysql database)?


By : Sharon
Date : March 29 2020, 07:55 AM
Hope this helps The problem is that getColumnCount will still return 0, despite that you added some rows. Just call setColumnCount as well.
You can verify this in the source code, or just perform a quick test, e.g.
code :
import javax.swing.table.DefaultTableModel;

public class DefaultTableModelDemo {
  public static void main( String[] args ) {
    DefaultTableModel defaultTableModel = new DefaultTableModel();
    defaultTableModel.addRow( new Object[]{"Test", "Test"} );
    System.out.println( "defaultTableModel.getRowCount() = " + 
       defaultTableModel.getRowCount() );
    System.out.println( "defaultTableModel.getColumnCount() = " + 
       defaultTableModel.getColumnCount() );
  }
}
defaultTableModel.getRowCount() = 1
defaultTableModel.getColumnCount() = 0
Swing based loading frame hangs on DB query

Swing based loading frame hangs on DB query


By : P.Tony
Date : March 29 2020, 07:55 AM
I wish this help you Don't put time-consuming operations on the same thread with Swing UI operations. All Swing UI operations take place on the "event dispatch thread", and it is up to you to keep time-consuming operations off of it.
Look at javax.swing.SwingWorker for a class that makes it easy to put time-consuming operations on a different thread.
Python - querying tables from database and having conditions in data frame

Python - querying tables from database and having conditions in data frame


By : thistle_fr
Date : March 29 2020, 07:55 AM
seems to work fine This should work, I've converted the list to a tuple so that it has round brackets to match the SQL syntax for an array instead of square brackets of a Python list:
code :
import pandas as pd
query = "Select * from customer where Customer in {}".format(tuple(customerlist))    
df = pd.read_sql(query, conn)
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