连接 Derby数据库

Derby数据库有两种运行模式（Derby的jar包都在%JAVA_HOME%/db/lib)

一、嵌入式数据库

public class EmbeddedDerbyTester {
    public static void main(String[] args) {
        String driver = "org.apache.derby.jdbc.EmbeddedDriver";//在derby.jar里面
        String dbName="EmbeddedDB";
        String dbURL = "jdbc:derby:"+dbName+";create=true";//create=true表示当数据库不存在时就创建它
        try {           
            Class.forName(driver);
            Connection conn = DriverManager.getConnection(dbURL);//启动嵌入式数据库
            Statement st = conn.createStatement();
            st.execute("create table foo (FOOID INT NOT NULL,FOONAME VARCHAR(30) NOT NULL)");//创建foo表
            st.executeUpdate("insert into foo(FOOID,FOONAME) values (1,'chinajash')");//插入一条数据
            ResultSet rs = st.executeQuery("select * from foo");//读取刚插入的数据
            while(rs.next()){
                int id = rs.getInt(1);
                String name = rs.getString(2);
                System.out.println("id="+id+";name="+name);
            }
        } catch(Exception e){
            e.printStackTrace();
        }
    }
}

运行上面程序后,会在当前目录生成名为EmbeddedDB的文件夹,既是EmbeddedDB数据库的数据文件存放的地方,控制台将输出

id=1;name=chinajash

 

 

二、网络数据库

public class NetworkServerDerbyTester {
    public static void main(String[] args) {
        String driver = "org.apache.derby.jdbc.ClientDriver";//在derbyclient.jar里面
        String dbName="NetworkDB";
        String connectionURL = "jdbc:derby://localhost:1527/" + dbName + ";create=true";
        try {
            /*
             创建Derby网络服务器,默认端口是1527,也可以通过运行
             <Derby_Home>/frameworks/NetworkServer/bin/startNetworkServer.bat
             来创建并启动Derby网络服务器,如果是Unix,用startNetworkServer.ksh
            */
            NetworkServerControl derbyServer = new NetworkServerControl();//NetworkServerControl类在derbynet.jar里面
            PrintWriter pw = new PrintWriter(System.out);//用系统输出作为Derby数据库的输出
            derbyServer.start(pw);//启动Derby服务器
            Class.forName(driver);
            DriverManager.getConnection(connectionURL);
            //do something
            derbyServer.shutdown();//关闭Derby服务器
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

运行上面程序后,会在当前目录生成名为NetworkDB的文件夹