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:
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 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"><!]></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:
Ignore the message:'java.sql.SQLException: Connection is broken: java.io.EOFException', Don't care about it.
Executing commands
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:
Ignore the message:'java.sql.SQLException: Connection is broken: java.io.EOFException', Don't care about it.
connecting to jdbc:hsqldb:hsql://localhost/
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 + 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！！！
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