JAVADB数据库范例

关于javaDB的介绍就不说了，直接上例子。

首先将derby.jar添加到classpath下面(IDE的话直接引入)

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import java.sql.*;   import java.util.*;   import java.io.*;   public class Test   {         public static void main(String[] args) throws Exception{           DBHelper db = new DBHelper();           db.createUserTable();   db.insertUser(1,"zhangsan2","123");           db.insertUser(1,"zhangsan3","1233");           db.insertUser(1,"zhangsan4","1234");           db.insertUser(1,"zhangsan5","12345");           ResultSet rs = db.query();           while(rs.next()){               int id = rs.getInt("id");               String name = rs.getString("name");               String pwd = rs.getString("password");               System.out.println("id->" + id + "\tname->" + name + "\tpassword->" + pwd);           }           rs.close();       }   }     /**  *   数据库工具类  */  class DBHelper   {          private Connection con = null ;         //连接         public DBHelper(){           //loadDriver("org.apache.derby.jdbc.EmbeddedDriver");     //load driver jdk6可以省略加载驱动这一步        getConnection();                                        //init Connection                  }                //load driver class       private void loadDriver(String driveName){           try{               Class.forName(driveName);           }catch(Exception e){               e.printStackTrace();               System.out.println("load driver failure");           }       }                //get Connection       private void getConnection(){           try{               //con = DriverManager.getConnection("jdbc:derby:userDB;create=true;user=test;password=test");//userDB创建在class运行目录//con = DriverManager.getConnection("jdbc:derby:a/b/userDB;create=true;user=test;password=test");//userDB创建在class下面的a/b文件夹下面，con = DriverManager.getConnection("jdbc:derby:d:/a/b/userDB;create=true;user=test;password=test");//userDB创建在d盘下面的a/b文件夹下面，        }catch(Exception e){               e.printStackTrace();           }       }              //create simple table for test       public void createUserTable(){           try{               Statement stat = con.createStatement();               String sql_create = "create table tb_user(id int,name varchar(20),password varchar(20))";               stat.execute(sql_create);               stat.close();           }catch(Exception e){               e.printStackTrace();           }                  }              //insert user info       public void insertUser(int id,String name,String pwd){           String sql_insert = "insert into tb_user values (?,?,?)";           try{               PreparedStatement pst = con.prepareStatement(sql_insert);               pst.setInt(1,id);               pst.setString(2,name);               pst.setString(3,pwd);               int i = pst.executeUpdate();           }catch(Exception e){               e.printStackTrace();           }       }              //query user info       public ResultSet query(){           String sql_insert = "select * from tb_user";           try{               PreparedStatement pst = con.prepareStatement(sql_insert);               return pst.executeQuery();           }catch(Exception e){               e.printStackTrace();           }           return null;       }   }  

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?result:

---------- 直接运行 ----------
id->1?name->zhangsan2?password->123
id->1?name->zhangsan3?password->1233
id->1?name->zhangsan4?password->1234
id->1?name->zhangsan5?password->12345

Output completed (7 sec consumed) - Normal Termination

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