可重用的 Hsqldb 启动、停止之 Ant 任务脚手架

可重用的 Hsqldb 启动、停止之 Ant 任务脚手架

在Eclipse里用Ant来启动Hsqldb

      <!-- Start the Hsqldb database server -->
      <targetname="dbstart"description="Start the Hsqldb database server">
            <javaclassname="org.hsqldb.Server"fork="yes"classpathref="hsqldb.classpath"failonerror="true">
                  <argvalue="-database.0"/>
                  <argvalue="file:${database.dir}/db"/>
            </java>
      </target>

此时如果要停止 Hsqldb ，即点击红色按钮来 Terminate 掉它，实现上，Hsqldb的Java线程还是在后台运行的，它并没有真正结束。

判断的方法有四种：
1、再次运行 ant startdb 任务，会发现 db.lck 还被使用，而 <delete dir="${database.dir}"/> 删除不了，被前一个实例 Lock 住了。
Buildfile: xxx\build.xml
startdb:
[delete] Deleting directory xxx\database

BUILD FAILED
xxx\build.xml:88: Unable to delete file xxx\database\db.lck

2、利用JDK 5.0以上的版本中的 jps 来查看，即：
%JAVA_HOME%/bin/jps -lvm
你可以看到其中有如下的信息显示
<pid> org.hsqldb.Server -database.0 file:database/db
即表明它还是在运行当中。

3、netstat -a | find "9001"
TCP XXX:9001 XXX:0 LISTENING
发现 Hsqldb 默认的服务端口 9001 还在监听中。

4、再次运行你的数据库连接程序，程序运行正常，还是可以连接上去，并可以完全正常进行你的数据操作。
由上面的方法可见它还是在正常运行中，Eclipse里的红色按钮并没有真正 Terminate 掉它。

那如何真正停止掉它呢？同样也有几种方法。
1、利用 Ant 本身提供的 sql 任务，如下发送 SHUTDOWN [COMPACT|IMMEDIATELY] 命令过去就可以了，如下：

      <!-- Shutdown the Hsqldb database server via Ant sql Task -->
      <targetname="dbshutdown"description="Shutdown the Hsqldb database server via Ant sql Task">
            <echomessage="Ignore the message:'java.sql.SQLException: Connection is broken: java.io.EOFException', Don't care about it."/>
            <sqldriver="org.hsqldb.jdbcDriver"url="jdbc:hsqldb:hsql://localhost/"userid="sa"password=""classpathref="hsqldb.classpath"onerror="stop"print="true"><![CDATA[
            shutdown;
            ]]></sql>
      </target>

但是虽然这个可以让 Hsqldb Server 停止掉了，但是会报错误，build出现错误我是不能接受的，不知道你是否接受？
shutdowndb:
[echo] Ignore the message:'java.sql.SQLException: Connection is broken: java.io.EOFException', Don't care about it.
[sql] Executing commands
[sql] 0 rows affected

BUILD FAILED
xxx\build.xml:124: java.sql.SQLException: Connection is broken: java.io.EOFException

打开 verbose 选项看一看更加详细的信息：
shutdowndb:
[echo] Ignore the message:'java.sql.SQLException: Connection is broken: java.io.EOFException', Don't care about it.
[sql] connecting to jdbc:hsqldb:hsql://localhost/
[sql] Loading org.hsqldb.jdbcDriver using AntClassLoader with classpath xxx\lib\hsqldb.jar

BUILD FAILED
java.sql.SQLException: socket creation error
at org.apache.tools.ant.taskdefs.JDBCTask.getConnection(JDBCTask.java:314)
at org.apache.tools.ant.taskdefs.SQLExec.execute(SQLExec.java:346)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: java.sql.SQLException: socket creation error
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.jdbcConnection.<init>(Unknown Source)
at org.hsqldb.jdbcDriver.getConnection(Unknown Source)
at org.hsqldb.jdbcDriver.connect(Unknown Source)
at org.apache.tools.ant.taskdefs.JDBCTask.getConnection(JDBCTask.java:304)
... 13 more
--- Nested Exception ---
java.sql.SQLException: socket creation error
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.jdbcConnection.<init>(Unknown Source)
at org.hsqldb.jdbcDriver.getConnection(Unknown Source)
at org.hsqldb.jdbcDriver.connect(Unknown Source)
at org.apache.tools.ant.taskdefs.JDBCTask.getConnection(JDBCTask.java:304)
at org.apache.tools.ant.taskdefs.SQLExec.execute(SQLExec.java:346)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)

也就是说在执行 SHUTDOWN 命令后，
org.apache.tools.ant.taskdefs.JDBCTask.getConnection(JDBCTask.java:314) 还去 getConnection，那肯定就出错了。

2、自己写个简单的 Ant 脚本来关闭它
ShutdownTask.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;

/**
 *ShutdownTask:AntTaskforshutdowntheHsqldbserver.
 *
 *@authorYuLimin
 */
publicclass ShutdownTask extends Task
{
      // Defaut Value
      private String msg = "ShutdownTask";
      private String driver = "org.hsqldb.jdbcDriver";
      private String url = "jdbc:hsqldb:hsql://localhost/";
      private String userid = "sa";
      private String password = "";
      private String sqlCommand = "SHUTDOWN";

      public ShutdownTask()
      {
            super();
      }

      /**
       *ForTest
       *
       *@paramargv
       *@throwsException
       */
      publicstaticvoid main(final String[] argv)
      {
            final ShutdownTask shutdownTask = new ShutdownTask();
            shutdownTask.shutdown();
      }

      /**
       *Themethodexecutingthetask
       */
      publicvoid execute() throws BuildException
      {
            System.out.println(msg + " Begin......");
            System.out.println("Driver=" + getDriver());
            System.out.println("URL=" + getUrl());
            System.out.println("Userid=" + getUserid());
            System.out.println("Password=" + getPassword());
            System.out.println("SqlCommand=" + getSqlCommand());
            shutdown();
            System.out.println(msg + " End......");
            System.out.println();
      }

      /**
       *Shutdownthedatabase
       */
      publicvoid shutdown()
      {
            Connection connection = null;
            Statement statement = null;
            try
            {
                  Class.forName(getDriver());
                  connection = DriverManager.getConnection(getUrl(),getUserid(),getPassword());
                  statement = connection.createStatement();
                  statement.execute(getSqlCommand());
                  statement.close();
                  connection.close();
            }
            catch(Exception e)
            {
                  e.printStackTrace();
                  thrownew RuntimeException(e);
            }
            finally
            {
                  if(statement != null)
                  {
                        try
                        {
                              statement.close();
                        }
                        catch(SQLException e)
                        {
                              thrownew RuntimeException(e);
                        }
                  }
                  if(connection != null)
                  {
                        try
                        {
                              connection.close();
                        }
                        catch(SQLException e)
                        {
                              thrownew RuntimeException(e);
                        }
                  }
            }
      }

      // More accessor method : setter & getter
      publicvoid setMsg(final String msg)
      {
            this.msg = msg;
      }

      publicvoid setDriver(final String driver)
      {
            this.driver = driver;
      }

      publicvoid setPassword(final String password)
      {
            this.password = password;
      }

      publicvoid setUrl(final String url)
      {
            this.url = url;
      }

      publicvoid setUserid(final String userid)
      {
            this.userid = userid;
      }

      publicvoid setSqlCommand(final String sqlCommand)
      {
            this.sqlCommand = sqlCommand;
      }

      public String getDriver()
      {
            returndriver;
      }

      public String getPassword()
      {
            returnpassword;
      }

      public String getUrl()
      {
            returnurl;
      }

      public String getUserid()
      {
            returnuserid;
      }

      public String getSqlCommand()
      {
            returnsqlCommand;
      }

      public String getMsg()
      {
            returnmsg;
      }
}

编译 javac -classpath %ANT_HOME%/lib/ant.jar ShutdownTask.java
打包 jar cvf ShutdownTask.jar *.*
把 ShutdownTask.jar 直接放到项目的lib目录下，下面的示例 classpath 我直接引入到 hsqldb.classpath中，可以根据需要放到项目的不同地方再进行调整引入使用等等。。。:)

build.xml里的调用示例，爱怎么用就怎么用，提供好几个示例。

      <!-- Classpath declaration -->
      <pathid="hsqldb.classpath">
            <filesetdir="${lib.dir}">
                  <includename="**/hsqldb.jar"/>
                  <includename="**/ShutdownTask.jar"/>
            </fileset>
      </path>

      <!-- Shutdown the Hsqldb database server via ShutdownTask -->
      <targetname="dbshutdownTask"description="Shutdown the Hsqldb database server via ShutdownTask">
            <!-- Define ShutdownTask -->
            <taskdefname="shutdownTask"classname="ShutdownTask"classpathref="hsqldb.classpath"/>
            <!-- Call ShutdownTask -->
            <!-- Default ShutdownTask, only like this -->
            <!-- <shutdownTask/> -->
            <!-- Sample MyShutdownTask -->
            <!-- <shutdownTask driver="org.hsqldb.jdbcDriver" url="jdbc:hsqldb:hsql://localhost/" userid="sa" password="" sqlCommand="SHUTDOWN" msg="MyShutdownTask"/> -->
            <!-- Sample MyShutdownTask SHUTDOWN COMPACT -->
            <!-- <shutdownTask driver="org.hsqldb.jdbcDriver" url="jdbc:hsqldb:hsql://localhost/" userid="sa" password="" sqlCommand="SHUTDOWN COMPACT" msg="MyShutdownTask"/> -->
            <!-- Sample MyShutdownTask SHUTDOWN IMMEDIATELY -->
            <shutdownTaskdriver="org.hsqldb.jdbcDriver"url="jdbc:hsqldb:hsql://localhost/"userid="sa"password=""sqlCommand="SHUTDOWN IMMEDIATELY"msg="MyShutdownTask"/>
      </target>

3、就在直接在命令行下运行 ant startdb ，然后 Ctrl + C 直接干掉它就可以。
如启动时的提示：From command line, use [Ctrl]+[C] to abort abruptly

补充
OS:Windows 2K Pro SP4 English
ant -version
Apache Ant version 1.6.5 compiled on June 2 2005

JDK 1.4.2 1.5.0 1.6.0 1.7.0都可以。。。

最后，如何使用它呢？
在其它项目中只要相应地 import 这个 build.xml 这个文件即可达到重用，如：新项目与这个项目并行，即

<?xml version="1.0" encoding="utf-8"?>
<projectname="JPA_OtherProject"default="compile"basedir=".">
      <import file="../Common/build.xml" />
    ......

也可以建立 build.properties 资源文件来配置一些信息等等。。。
附上完整的 build.xml 与 ShutdownTask.jar 以及 Eclipse项目文件，import 到 Eclipse 中，把 build.xml 拖到Ant视图里，直接就可以用了。

BTW:刚才从Word里拷贝过来提交，JavaEye的有BUG，现在重新修改了一下！！！

不错，呵呵，试了一下效果。
但是源码build.xml中凡是url的地方都没有指明数据库名，不知道是不是漏掉了，像是这样类似的定义：

<shutdownTask driver="org.hsqldb.jdbcDriver" url="jdbc:hsqldb:hsql://localhost/" userid="sa" password="" sqlCommand="SHUTDOWN IMMEDIATELY" msg="MyShutdownTask"/>

我自己加上之后跑就没有问题了。于是可能需要在dbstart任务里加上数据库别名：

<!-- Start the Hsqldb database server -->
<target name="dbstart" description="Start the Hsqldb database server">
   <java classname="org.hsqldb.Server" fork="yes" classpathref="hsqldb.classpath" failonerror="true">
	<arg value="-database.0"/>
	<arg value="file:${database.dir}/${db.name}"/>
         <!-- 这里加上数据库别名--> 
	<arg value="-dbname.0"/>
	<arg value="${db.name}"/>
   </java>
</target>

数据库别名是可加可不加的参数，因此我没有加上去：）