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JComboBox usage example which is filling JComboBox from database, connection is passed to ComboBox.
java code
/*
* MyComboBox.java
*

*/

package connectingdatabase.Search;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JComboBox;

/**
*
* @author sami
*/
class MyComboBox extends JComboBox
{
public MyComboBox(Connection conn,String TableName)
{
if(conn==null) {
return;
}
Statement stat;
try {
stat = conn.createStatement();
ResultSet rs=stat.executeQuery("Select * from "+TableName+"; ");
ResultSetMetaData rsmd= rs.getMetaData();
int size=rsmd.getColumnCount();
for(int i=0;i<size;i++)
{
addItem(rsmd.getColumnName(i+1));
}
} catch (SQLException ex) {
ex.printStackTrace();
}

}
}





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