Derby数据库是一个纯用
Java实现的内存
数据库，属于Apache的一个开源项目。由于是用Java实现的，所以可以在任何平台上运行；另外一个特点是体积小，免安装，只需要几个小jar包就可以运行了。下面说下其安装及配置
安装
1).从apache下载Derby数据库(如db-derby-10.10.1.1-bin.zip)并解压到任意目录(如：D:\Derby\db-derby-10.10.1.1-bin)。
2).配置环境变量DERBY_HOME=D:\Derby\db-derby-10.10.1.1-bin
并添加到path和classpath环境变量(%DERBY_HOME%\bin;%DERBY_HOME%\lib\derbyrun.jar)
3).测试数据库安装 C:\>sysinfo
------------------ Java Information ------------------ Java Version: 1.7.0_40 Java Vendor: Oracle Corporation Java home: C:\Program Files\Java\jdk1.7.0_40\jre Java classpath: D:\Derby\db-derby-10.10.1.1-bin\bin;D:\Derby\db-derby-10.10.1.1-bin\lib\derbyrun.jar; OS architecture: amd64 OS version: 6.1 Java user name: qqqqq Java user home: D:\userdata\qqq Java user dir: C:\ java.specification.name: Java Platform API Specification java.specification.version: 1.7 java.runtime.version: 1.7.0_40-b43 --------- Derby Information -------- [D:\Derby\db-derby-10.10.1.1-bin\lib\derby.jar] 10.10.1.1 - (1458268) [D:\Derby\db-derby-10.10.1.1-bin\lib\derbytools.jar] 10.10.1.1 - (1458268) [D:\Derby\db-derby-10.10.1.1-bin\lib\derbynet.jar] 10.10.1.1 - (1458268) [D:\Derby\db-derby-10.10.1.1-bin\lib\derbyclient.jar] 10.10.1.1 - (1458268) |
连接
C:\>ij
ij 版本 10.10
ij> CONNECT 'jdbc:derby:D:\Project\derbyDB\testdb;create=true';（如果数据库testdb不存在，则创建改数据库）
ij> CONNECT 'jdbc:derby:D:\Project\derbyDB\testdb;'; （连接testdb数据库）
ij(CONNECTION1)> CREATE TABLE FIRSTTABLE(ID INT PRIMARY KEY,NAME VARCHAR(12));（创建表）
已插入/更新/删除 0 行
ij(CONNECTION1)> INSERT INTO FIRSTTABLE VALUES(10,'TEN'),(20,'TWENTY'),(30,'THIRTY');（插入数据）已插入/更新/删除 3 行
ij(CONNECTION1)> SELECT * FROM FIRSTTABLE;
ID |NAME
------------------------
10 |TEN
20 |TWENTY
30 |THIRTY
已选择 3 行
ij(CONNECTION1)>exit;（退出）
说明
1. sysinfo工具用于显示Java环境信息和Derby的版本信息。
2. ij工具来进行数据库交互，执行SQL脚本，如查询、增删改、创建表等
例子
下面是个完整的例子，如何程序中操作JavaDB
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import java.util.Properties; public class TestDerby { public static void main(String[] args) { try { Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance(); System.out.println("Load the embedded driver"); Connection conn = null; Properties props = new Properties(); props.put("user", "user1"); props.put("password", "user1"); conn=DriverManager.getConnection("jdbc:derby:C:\\Project\\derbyDB\\testdb;"); System.out.println("create and connect to testdb"); Statement s = conn.createStatement(); ResultSet rs = s.executeQuery("SELECT * FROM FIRSTTABLE"); System.out.println("name\t\tscore"); while(rs.next()) { StringBuilder builder = new StringBuilder(rs.getString(1)); builder.append("\t"); builder.append(rs.getInt(1)); System.out.println(builder.toString()); } } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); }catch (Exception e) { e.printStackTrace(); } } } |