Derby JDBC database connection URL
Derby JDBC database connection URL
A Java application using the JDBC API establishes a connection
to a database by obtaining a Connection object.
The standard way to obtain a Connection object
is to call the method DriverManager.getConnection,
which takes a String containing a connection URL (uniform resource locator).
A JDBC connection URL provides a way of identifying a database. It also allows
you to perform a number of high-level tasks, such as creating a database or
shutting down the system.
An application in an embedded environment uses a different connection URL
from that used by applications using the Derby Network
Server in a client/server environment. See the Derby Server and Administration Guide for
more information on the Network Server.
However, all versions of the connection URL (which you can use for tasks
besides connecting to a database) have common features:
you can specify the name of the database you want to connect to
you can specify a number of attributes and values that allow you to accomplish
tasks. For more information about what you can specify with the Derby connection
URL, see .
The connection URL syntax is as follows:
jdbc:derby:[subsubprotocol:][databaseName][;attribute=value]*
Subsubprotocol, which is not typically specified, determines
how Derby looks for a database:
in a directory, in memory, in a class path, or in a jar file. Subsubprotocol is one of
the following:
directory: The default. Specify this explicitly only to distinguish
a database that might be ambiguous with one on the class path.
memory: Databases exist only in main memory and are not written to
disk. An in-memory database may be useful when there is no need to persist the
database -- for example, in some testing situations.
classpath: Databases are treated as read-only databases, and all databaseNames must
begin with at least a slash, because you specify them "relative" to the classpath
directory. See
for details.
jar: Databases are treated as read-only databases. DatabaseNames might
require a leading slash, because you specify them "relative" to the jar file.
for details.
jar requires an additional element immediately before the
database name:
(pathToArchive)
pathToArchive is the path to the jar or zip file that holds
the database.
For detailed reference about connection URL attributes and values, see
"Setting attributes for the database connection URL" in the
Derby Reference Manual.
The following example shows the use of the connection URL:
Connection conn = DriverManager.getConnection("jdbc:derby:sample");
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数据库（9）
公司的项目牵扯到的数据库有mysql，sqlserver，oracle，每一个都开启一个客户端，非常麻烦！&
&&&& 同事介绍了一款小软件 DbVisualizer，可以连接多种数据库，操作起来很是方便啊！&
&&&& 今天就用连接oracle演示一遍吧!&
&&&& 安装文件15M，传不上来，但是网上随处可以找到！下下来就好了&
&&&& 我用的版本是 DbVisualizer free 6.5.7 免费版的&
&&&& 安装好后，直接打开找到 Driver Manager&
&&&&打开新窗口，刚开始，Oracle Thin 不是绿色钩，而是红色X，需要加载好驱动.jar包ojdbc14.jar,然后Name，URL
Format,Driver Class 都设置好，连接成功，Oracle Thin会自动变成绿色钩&
&&&& 如图&
&&&&&然后如图，打开&
&&&&&在新窗口输入名字,可以是你的数据名&
&&&&&下一步,选中刚刚你设置好的 Oracle Thin&
&&&&&&再下一步,测试下是否连接到数据库了&
&&&&&&最后打开数据库了，你会看见自己建立的数据库&
参考知识库
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数据库（9）
DbVisualizer是一个完全基于JDBC的跨平台数据库管理工具。它允许通过JDBC的驱动同时连接各种不同的数据库；立刻指向并浏览数据库结构，观看数据库对象的详细特征，图解桌面数据、任意的SQL声明或SQL脚本，利用逆向工程图示出primary/foreign的键值，并以先进的图表方式显示出来，友好的图形界面接口与各种特色的独特组合，足以值得您去收藏一份。
使用版本9.1 破解版（破解补丁自己google下）
安装后会自带一些常用数据库的JDBC驱动程序，如DB2 LUW（linux unix windows）。点击 Tools——Driver Manager 如图所示：
可以看到左边列表中打钩的都表示已经是驱动安装好的，这里我们来安装Frontbase驱动，首先自己去frontbase官网下载jdbc驱动，将下载好解压后的文件夹放入到，DBvisualizer 安装包的jdbc文件夹中。
点击Driver Manager 页面 右下角的文件夹图标，如上图所示（添加驱动路径，路径为刚才放到的jdbc文件夹中），找到frontbasejdbc驱动jar包。添加完如下图所示：
可以看到，左边Frontbase已经打钩，表示安装完成。
另外两个常用工具：
1、自动提示编译（在输入sql语句时自动提示，破解版才有该功能）
Tools——Tool Properties——SQL Commander ——Auto Completion 将右边的选项都勾上如图所示：
2、获取错误消息
用该软件连接DB2时，如果执行某语句出错，不会自动返回错误消息。
Connection下 找到db2的连接，双击，在右边界面中点击Properties，下面到Drive Properties. 右边下面有一个变量是&retrieveMessagesFromServerOnGetMessage（jdbc连接的一个选项,指示JDBC 驱动程序从DB2 服务器获取可读的错误消息）的Parameter，将其值设为true,重新连接到数据库，这样就可以看到提示错误。如图所示：
官网在线使用示例：，看完它们，基本功能就熟悉了。
&SQL 处理器&
&表数据编辑&
&外键向导&
&查询设计器（以图形化的操作界面设计SQL语句，对于我们来说，用的机会不会太多）
想要了解更多，就去官网看看吧。
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