标签:alt 驱动程序 block select dialog code 帮助 -o port
JDBC驱动程序分为四类:
1)JDBC-ODBC桥驱动;
2)JDBA本地驱动;
3)JDBC网络驱动;
4)本地协议纯JDBC驱动;
JDBC的连接地址实际上是由以下的3个部分组成。
(1)jabc 协议:JDBC URL 中的协议总是 jdbc。
(2)子协议:驱动程序名或数据库连接机制(这种机制可由一个或多个驱动程序支持)的名称,如
MySQL。
(3)子名称: 种标识数据库的方法。必须遵循“//主机名:端口/子协议”的标准URL 命名约定,
如//localhost:3306/mldn
加载驱动程序:
Class.forName(driverClass)
//加载MySql驱动
Class.forName("com.mysql.jdbc.Driver")
//加载Oracle驱动
Class.forName("oracle.jdbc.driver.OracleDriver")
1、增加数据
insert into 表名称[(字段1,字段2,....字段n)]values(值1,值2.....值n);
2、删除数据
delete 表名称[删除条件];
3、更新数据
update 表名称 set 字段1=值1......字段n=值1[where 更新条件];
4查询数据
select{*|column alias}
from 表名称 别名
[where condition(s)]; //设置查询条件
实验代码
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.EventObject;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import junit.framework.Test;
public class jishiben implements ActionListener{
JFrame frame;
JMenu q,w,e,r,t;
JTextArea wb;
JMenuBar bar;
JMenuItem one,two,theer,four,five,one1,two1,theer1;
JFileChooser open;
File file;
public jishiben() {
frame=new JFrame("记事本");
bar=new JMenuBar();
q=new JMenu("文件(F)");
w=new JMenu("编辑(E)");
e=new JMenu("格式(O)");
r=new JMenu("查看(V)");
t=new JMenu("帮助(H)");
wb=new JTextArea();
one=new JMenuItem("新建(N)");
two=new JMenuItem("打开(O)");
theer=new JMenuItem("保存(S)");
four=new JMenuItem("另存为(A)");
five=new JMenuItem("退出(X)");
one1=new JMenuItem("撤销(U)");
two1=new JMenuItem("复制(C)");
theer1=new JMenuItem("粘贴(P)");
q.setMnemonic('F');
w.setMnemonic('E');
e.setMnemonic('O');
r.setMnemonic('V');
t.setMnemonic('H');
one1.setMnemonic('U');
two1.setMnemonic('C');
theer1.setMnemonic('P');
one.setMnemonic('N');
two.setMnemonic('O');
theer.setMnemonic('s');
four.setMnemonic('A');
five.setMnemonic('X');
//q.setAccelerator(KeyStroke.getKeyStroke('F',java.awt.Event.ALT_MASK));
one.setAccelerator(KeyStroke.getKeyStroke('N',java.awt.Event.CTRL_MASK));
two.setAccelerator(KeyStroke.getKeyStroke('O',java.awt.Event.CTRL_MASK));
theer.setAccelerator(KeyStroke.getKeyStroke('S',java.awt.Event.CTRL_MASK));
four.setAccelerator(KeyStroke.getKeyStroke('A',java.awt.Event.CTRL_MASK));
five.setAccelerator(KeyStroke.getKeyStroke('X',java.awt.Event.CTRL_MASK));
one1.setAccelerator(KeyStroke.getKeyStroke('U',java.awt.Event.CTRL_MASK));
two1.setAccelerator(KeyStroke.getKeyStroke('C',java.awt.Event.CTRL_MASK));
theer1.setAccelerator(KeyStroke.getKeyStroke('P',java.awt.Event.CTRL_MASK));
one.addActionListener(this);
two.addActionListener(this);
theer.addActionListener(this);
four.addActionListener(this);
five.addActionListener(this);
q.add(one);
q.add(two);
q.add(theer);
q.add(four);
q.addSeparator();
q.add(five);
w.add(one1);
w.add(two1);
w.add(theer1);
bar.add(q);
bar.add(w);
bar.add(e);
bar.add(r);
bar.add(t);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent arg0) {
System.exit(1);
}
});
frame.add(wb);
frame.setJMenuBar(bar);
frame.setVisible(true);
frame.pack();
frame.setLocation(300,300);
}
@Override
public void actionPerformed(ActionEvent event) {
Object obj=event.getSource();
if(obj instanceof JMenuItem) {
JMenuItem item=(JMenuItem) obj;
if(item==one) {
new jishiben();
}
else if(item == two){
open=new JFileChooser();
open.showOpenDialog(null);
file = open.getSelectedFile();
try {
FileInputStream fis=new FileInputStream(file);
byte[] b=new byte[fis.available()];
fis.read(b);
wb.append(new String(b));
fis.close();
}catch(FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else if(item == theer) {
}
else if(item ==four) {
open=new JFileChooser();
open.showSaveDialog(null);
file = open.getSelectedFile();
try {
if(!file.exists()) {
file.createNewFile();
}
FileOutputStream fos=new FileOutputStream(file);
byte[] b = wb.getText().getBytes();
fos.write(b);
fos.close();
}catch(IOException c) {
c.printStackTrace();
}
}else if(item== five) {
System.exit(1);
}
}
}
}
测试代码:
public class jishibenTest {
public static void main(String[] args) {
new jishiben();
}
}
标签:alt 驱动程序 block select dialog code 帮助 -o port
原文地址:https://www.cnblogs.com/hhl296738954/p/11960516.html