DB2和Java。通过GUI将数据添加到数据库。 [英] DB2 and Java. Adding data to database through GUI.
问题描述
首先,我在我的程序中创建一个搜索功能,我实现了相同的逻辑添加数据到数据库,但搜索功能工作,而添加函数没有(SQLException)。我从 DB2 创建了一个名为名称的表格,只有一列 FullName 。您是否仍需要创建一个新查询以将数据添加到表中?或不?我想通过GUI将数据添加到数据库。
First I create a search function in my program and I implemented the same logic in adding data into the database but the search function works and the add function didn't (SQLException). I created a table from DB2 named Names with only one column FullName. Do you still need to create a new query to add data into the table? or not? I want to add data into the database through GUI.
这是我的Java代码:
Here is my Java Code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class ConnectAndSearchDB extends JFrame implements ActionListener
{
private JTextField fieldSearch,fieldAdd;
private JButton searchB,addB;
private Connection connection;
private String name;
private ResultSet rs,rs1;
public ConnectAndSearchDB() throws SQLException,ClassNotFoundException
{
setLocationRelativeTo(null);
setDefaultCloseOperation(this.EXIT_ON_CLOSE);
setLayout(new GridLayout(2,2));
fieldSearch = new JTextField(20);
searchB = new JButton("Search");
fieldAdd = new JTextField(20);
addB = new JButton("Add");
add(searchB);
add(fieldSearch);
add(addB);
add(fieldAdd);
searchB.addActionListener(this);
addB.addActionListener(this);
establishConnection();
pack();
setResizable(false);
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
Object act = e.getSource();
if(act.equals(searchB))
{
name = fieldSearch.getText();
searchData();
}else if(act.equals(addB))
{
try {
addData();
} catch (ClassNotFoundException e1)
{
e1.printStackTrace();
System.out.println("ClassNotFound");
} catch (SQLException e1)
{
e1.printStackTrace();
System.out.println("SQLError");
}
}
}
public void establishConnection() throws SQLException , ClassNotFoundException
{
Class.forName("com.ibm.db2.jcc.DB2Driver");
connection = DriverManager.getConnection("jdbc:db2://localhost:50000/COLINN", "Colinn","ezioauditore");
}
private void searchData()
{
try
{
PreparedStatement s = null;
String query;
query = "SELECT * from NAMES";
s=connection.prepareStatement(query);
rs = s.executeQuery();
boolean matchfound = false;
while(rs.next())
{
if(rs.getString(1).equals(name))
{
matchfound = true;
System.out.println("The name "+name+" is found in the Database");
break;
}
}
if(matchfound == false)
{
System.out.println("Match Not Found");
}
}
catch(SQLException e)
{
e.printStackTrace();
}
}
public void addData() throws ClassNotFoundException,SQLException
{
PreparedStatement ps = null;
String query;
query = "INSERT INTO NAMES VALUES('"+fieldAdd.getText()+"')";
ps = connection.prepareStatement(query);
rs1 = ps.executeQuery();
System.out.println("Written Successfully");
}
public static void main (String args[]) throws SQLException,ClassNotFoundException
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
new ConnectAndSearchDB();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}
这是Names表:
推荐答案
我高度怀疑使用 rs1 = ps.executeQuery();
插入/更新数据库是课程您应该使用 int count = ps.executeUpdate();
I highly suspect that using rs1 = ps.executeQuery();
to insert/update the database is the course of your issue, you should be using int count = ps.executeUpdate();
请参阅 PreparedStatement#executeUpdate
了解更多详情
See PreparedStatement#executeUpdate
for more details
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