java读取PI数据库测点值.docx

1、java读取PI数据库测点值Java读取PI数据库测点值最近公司组织培训PI数据库，在听课之余试验了一下java直接读取PI数据库。1. 安装数据库。安装osi，启动PIPerfMon_Basic.bat，使用process book 绘制一个趋势图，加入几个例子测点，如“CDT158”，如图：2. Piapi简介利用PIAPI直接操作PI，安装PI数据库后会有一个piapi32.dll，提供了.net读取的接口。3. Jnative简介JNative是一种能够使Java语言使调用DLL的一种技术，对JNI进行了封装。我们将下载的jnative.jar解压后，有一个jNativeCpp.dll

2、，将其拷入C:windowssystem32下，并将jnative.jar加载到我们项目中来。准备工作就绪。4. 程序读取。要点记录：1. 阅读API。打开PI System-about PI SDK-View Help，即可看到api文档。PI数据库的数据分别存储在Snapshot或者Archive中,一个是快照一个是档案文件,这样做是为了方便PI数据库对数据进行压缩.那么自然对数据库的读取也分为对Snapshot和Archive读取.snapshot和archive的值都是用PIValue的形式表示的， PIValue对象包括了数值和时间。其中Pi的api中，用到最多的函数组是time f

3、unctions、archive functions、snapshot functions。time functions包含很多对时间处理的函数； archive functions包含了对档案文件的读写的函数；snapshot functions包含了对快照的读取函数。2. 时间处理。.net调用piapi传入时间类型时，是将.net的Date类型转为int数组，并可以直接将int数组传入方法。Java使用时间类型稍微复杂一些，需要调用pitm_intsec方法，该方法帮助如下：PIVOID pitm_intsec(int32 PIPTR * timedate,int32 timearray

4、6 );ReturnsNoneArgumentstimedate (returned)PI time stamptimearray (passed)表示该方法2个参数，第一个是一个int型数组（指针），第二个参数是一个int型数组。第一个参数是返回参数，第二个参数是传入参数。注意，传入int32 timearray6参数时，必须使用Pointer模拟指针，并且，循环设置数组元素时，注意pointer.setIntAt(intoffset, intvalue)，offset的下标，比如第一个元素是0，第二个元素不是1，要看int占几个字节，int在。Net中占4个字节，所以第二个元素是4，第三个

5、元素是8。这是java调用.net时，传入和读取数组时需要注意的事项。3. Java与。Net类型匹配。Api里的除字符串外的指针类型，对应jnative的pointer。Api里的int、float等基本类型和String类型，在java中必须指定类型（Type.INT）Api里的date，是用int表示的，详见上条。4. 传值与返回值。Jnative对象调用invoke后会有返回，对照api，一般返回值是调用状态。如果要查询一个测点值，返回值是通过传入的pointer对象读取出来的。源代码如下：import java.text.ParseException;import java.text

6、.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.regex.Matcher;import java.util.regex.Pattern;import org.xvolks.jnative.JNative;import org.xvolks.jnative.Type;import org.xvolks.jnative.exceptions.NativeException;import org.xvolks.jnative.pointers.Pointer;import org.

7、xvolks.jnative.pointers.memory.HeapMemoryBlock;import org.xvolks.jnative.pointers.memory.MemoryBlock;import org.xvolks.jnative.pointers.memory.MemoryBlockFactory;/* * Java通过jnative调用pi实时数据库dll类库piapi32.dll获取tag标签数据 * */public class PIClientUtil private static PIClientUtil piClientUtil=new PIClientUt

8、il(); public static void main(String args) /PIClientUtil.getPIClientUtil().getTimeFromInt(); /PIClientUtil.getPIClientUtil().getTagValue(picompress_Compression Ratio_CALC); /PIClientUtil.getPIClientUtil().getTagValueByTime(CDT158,2012-05-17 11:11:11); /PIClientUtil.getPIClientUtil().getTagValuesByTi

9、meToTime(CDT158,2012-05-17 11:11:11,2012-05-17 18:00:00,2); PIClientUtil.getPIClientUtil().getTagMaxValue(CDT158,2012-05-17 11:11:11,2012-05-17 18:00:00); /PIClientUtil.getPIClientUtil().getTimeSecint(1); /PIClientUtil.getPIClientUtil().getPiTime(); /PIClientUtil.getPIClientUtil().getTimeIntSec(2012

10、-03-03 12:00:00); public static PIClientUtil getPIClientUtil() return piClientUtil; private PIClientUtil() try / *连接PI数据库*/ / */ JNative messageBox = new JNative(piapi32.dll, piut_setservernode); messageBox.setRetVal(Type.INT); messageBox.setParameter(0, Type.STRING, 127.0.0.1);/服务器ip messageBox.inv

11、oke();System.out.println(piut_setservernode:+messageBox.getRetValAsInt(); catch (NativeException e) / TODO Auto-generated catch block e.printStackTrace(); catch (IllegalAccessException e) / TODO Auto-generated catch block e.printStackTrace(); /* * 获取tag最新值 * param tagName * return */ public float ge

12、tTagValue(String tagName) try JNative messageBox = new JNative(piapi32.dll, pipt_findpoint); messageBox.setRetVal(Type.INT); messageBox.setParameter(0, Type.STRING, tagName); Pointer p=new Pointer(new HeapMemoryBlock(1024); messageBox.setParameter(1, p); messageBox.invoke(); int ptId=p.getAsInt(0);

13、if(0=messageBox.getRetValAsInt() System.out.println(测点id:+ptId); messageBox = new JNative(piapi32.dll, pisn_getsnapshot); messageBox.setRetVal(Type.INT); messageBox.setParameter(0, Type.INT, + ptId); Pointer pp=new Pointer(new HeapMemoryBlock(1024); messageBox.setParameter(1, pp); messageBox.setPara

14、meter(2, new Pointer(new HeapMemoryBlock(1024); /messageBox.setParameter(3, new Pointer(new HeapMemoryBlock(1024); /messageBox.setParameter(4, new Pointer(new HeapMemoryBlock(1024); messageBox.invoke(); if(0=messageBox.getRetValAsInt() System.out.println(tagName+测点值:+pp.getAsFloat(0); return pp.getA

15、sFloat(0); else System.out.println(查询测点失败); catch (NativeException e) / TODO Auto-generated catch block e.printStackTrace(); catch (IllegalAccessException e) / TODO Auto-generated catch block e.printStackTrace(); return 0F; /* * 获取测点制定时间点的值 * param tagName * return */ public float getTagValueByTime(

16、String tagName,String time) try JNative messageBox = new JNative(piapi32.dll, pipt_findpoint); messageBox.setRetVal(Type.INT); messageBox.setParameter(0, Type.STRING, tagName); Pointer p=new Pointer(new HeapMemoryBlock(8); messageBox.setParameter(1, p); messageBox.invoke(); int ptId=p.getAsInt(0); i

17、f(0=messageBox.getRetValAsInt() System.out.println(测点id:+ptId); messageBox = new JNative(piapi32.dll, piar_value); messageBox.setRetVal(Type.INT); messageBox.setParameter(0, Type.INT, + ptId); Pointer pp=new Pointer(new HeapMemoryBlock(1024); Pointer pp_status = new Pointer(new HeapMemoryBlock(1024)

18、; messageBox.setParameter(1,getTimeIntSec(time); messageBox.setParameter(2, Type.INT,3+); messageBox.setParameter(3, pp); messageBox.setParameter(4, pp_status); messageBox.invoke(); if(0=messageBox.getRetValAsInt() System.out.println(tagName+测点值:+pp.getAsFloat(0); System.out.println(tagName+status值:

19、+pp_status.getAsInt(0); return pp.getAsFloat(0); else System.out.println(tagName+查询返回值:+messageBox.getRetValAsInt(); else System.out.println(查询测点失败); catch (NativeException e) / TODO Auto-generated catch block e.printStackTrace(); catch (IllegalAccessException e) / TODO Auto-generated catch block e.

20、printStackTrace(); return 0F; /* * 查询测点某时间段内最小值 * param tagName * param time1 * param time2 */ public void getTagMinValue(String tagName,String time1,String time2) int code = 1; this.getTagValuesByTimeToTime(tagName, time1, time2, code); /* * 查询测点某时间段内最大值 * param tagName * param time1 * param time2

21、*/ public void getTagMaxValue(String tagName,String time1,String time2) int code = 2; this.getTagValuesByTimeToTime(tagName, time1, time2, code); /* * 查询测点某时间段内平均值 * param tagName * param time1 * param time2 */ public void getTagAvgValue(String tagName,String time1,String time2) int code = 5; this.g

22、etTagValuesByTimeToTime(tagName, time1, time2, code); /* * * param tagName * return */ public void getTagValuesByTimeToTime(String tagName,String time1,String time2, int code) try JNative messageBox = new JNative(piapi32.dll, pipt_findpoint); messageBox.setRetVal(Type.INT); messageBox.setParameter(0

23、, Type.STRING, tagName); Pointer p=new Pointer(new HeapMemoryBlock(1024); messageBox.setParameter(1, p); messageBox.invoke(); int ptId=p.getAsInt(0); if(0=messageBox.getRetValAsInt() System.out.println(测点id:+ptId); messageBox = new JNative(piapi32.dll, piar_summary); messageBox.setRetVal(Type.INT);

24、/下面开始设置参数 messageBox.setParameter(0, Type.INT, + ptId); Pointer p_startTime = this.getTimeIntSec(time1); Pointer p_endTime = this.getTimeIntSec(time2); Pointer p_retVal = new Pointer(new HeapMemoryBlock(8); Pointer p_pctGood = new Pointer(new HeapMemoryBlock(8); messageBox.setParameter(1, p_startTim

25、e); messageBox.setParameter(2, p_endTime); messageBox.setParameter(3, p_retVal); messageBox.setParameter(4, p_pctGood); messageBox.setParameter(5, Type.INT,code+); messageBox.invoke(); if(0=messageBox.getRetValAsInt() System.out.println(tagName+测点返回值:+p_retVal.getAsFloat(0); else System.out.println(

26、tagName+查询状态值:+messageBox.getRetValAsInt(); else System.out.println(查询测点失败); catch (NativeException e) e.printStackTrace(); catch (IllegalAccessException e) e.printStackTrace(); /* * 将时间串转换为int * 格式:11-Aug-17 18:00:00 * param time * return */ public int getPiTime(String time) / 获取时间点 try String tt =

27、 time; Pointer pointer = new Pointer(MemoryBlockFactory.createMemoryBlock(8); JNative messageBox = new JNative(piapi32.dll, pitm_parsetime); messageBox.setRetVal(Type.INT); messageBox.setParameter(0, Type.STRING, tt); messageBox.setParameter(1, Type.INT, 0); messageBox.setParameter(2, pointer); mess

28、ageBox.invoke(); if(0 = messageBox.getRetValAsInt() System.out.println(执行成功,getPiTime结果是:+ pointer.getAsInt(0); return pointer.getAsInt(0); else System.out.println(执行失败); return 0; catch (NativeException e) e.printStackTrace(); return 0; catch (IllegalAccessException e) e.printStackTrace(); return 0

29、; /* * 将整数转换为时间,同上方法互逆 * param time * return */ public String getTimeFromInt(int time) try Pointer pointer = new Pointer(MemoryBlockFactory.createMemoryBlock(8); JNative messageBox = new JNative(piapi32.dll, pitm_formtime); messageBox.setRetVal(Type.INT); messageBox.setParameter(0, Type.INT,this.getPiTime()+); messageBox.setParameter(1, pointer); messageBox.setParameter(2,19); messageBox.invoke(); System.out.println(结果是:+ pointer.getAsString(); return pointer.getAsString(); catch (NativeException e)