/* * dbapi.java * * Created on 2003年7月3日, 下午10:56 */package handenglish;/** * dbapi.java * * Created on 2002年10月8日, 下午10:37 */import javax.microedition.midlet.*;import javax.microedition.rms.*;import java.io.*;import java.util.*;import javax.microedition.lcdui.*;/** * * @author  Administrator * @version *//*class DriverStruct{  public    String certificate;  public    Image picture;  public    String  name;  public    Date birthday;  public    short classes;  public    short point;  public    String  punish;  public    short sex;  public    Date makedate;  public    Date enddate;  public    String  address;}*/public class DbApi {    public RecordStore myRecordStore;    public boolean dbOpenJug;            public DbApi(String dbName) {        dbOpenJug=false;        openDatabase(dbName);    }    public boolean openDatabase(String dbName) {        if (dbOpenJug) {            try {                myRecordStore.closeRecordStore();            }            catch(RecordStoreException e) {                return false;            }        }        try {            myRecordStore= RecordStore.openRecordStore(dbName,true);            dbOpenJug=true;        }        catch(RecordStoreException e) {            return false;        }        return true;    }        public byte[] readRecord(int nowRecordId) {        try {            if (myRecordStore.getNumRecords()>=nowRecordId) {                RecordEnumeration tempEnumRecord;                tempEnumRecord=getAllRecord();                for(int i=1;i<nowRecordId;i++)                    tempEnumRecord.nextRecord();                return tempEnumRecord.nextRecord();            }            else                return null;        }        catch(Exception e) {            return null;        }    }            public int addDatabase(byte[] dbInfo) {                if ((dbInfo.length>0)&&(dbOpenJug)) {            try {                return myRecordStore.addRecord(dbInfo,0,dbInfo.length);            }            catch(RecordStoreException e) {                return -1;            }        }        return -1;    }    public boolean closeDatabase() {                if (dbOpenJug) {            try {                myRecordStore.closeRecordStore();                dbOpenJug = false;                return true;            }            catch(RecordStoreException e) {            }        }        return false;    }        public int getRecordNum() {        int num;        if(dbOpenJug) {            try {                num=myRecordStore.getNumRecords();                return num;            }            catch(Exception e) {                return 0;            }        }        else            return 0;    }    public RecordEnumeration getAllRecord() {        try {            return myRecordStore.enumerateRecords(null,null,false);        }        catch(Exception e) {            return null;        }    }    public void recordIndex(Hashtable indexHash) {        byte[] tempB;        byte[] tempRecord = new byte[100];        int tLen,tId;        RecordEnumeration tempEnumRecord;        ByteArrayInputStream myByteStream=new ByteArrayInputStream(tempRecord);        DataInputStream myIn=new DataInputStream(myByteStream);        tempEnumRecord=getAllRecord();        try {            while(tempEnumRecord.hasNextElement()) {                tId = tempEnumRecord.nextRecordId();                tLen = myRecordStore.getRecordSize( tId );                if ( tLen > tempRecord.length )                    tempRecord = new byte[tLen+40];                //tempRecord=tempEnumRecord.nextRecord();                myRecordStore.getRecord( tId,tempRecord,0 );                myByteStream.reset();                int tempI=myIn.readInt();                String tempS=myIn.readUTF();                indexHash.put(tempS,new Integer(tempI));            }        }        catch (Exception e) {        }    }        public boolean deleteDatabase(String dbName) {        if (dbOpenJug) {            closeDatabase();        }        try {            RecordStore.deleteRecordStore(dbName);            return true;        }        catch (Exception e) {            return false;        }    }        public boolean deleteRecord(int recordId) {        try {            myRecordStore.deleteRecord(recordId);            return true;        }        catch(Exception e ) {            return false;        }    }        public void  deleteAll(){        if ( !dbOpenJug ) return;        try {            int tempId;            RecordEnumeration tempEnumRecord =getAllRecord();            while(tempEnumRecord.hasNextElement()) {                tempId=tempEnumRecord.nextRecordId();                deleteRecord( tempId );            }        }        catch (Exception e) {}    }/*    public void setID(int recordID){        byte[] t = {0};        try {            if ( getRecordNum() < 1 )                myRecordStore.setRecord( 1,t,0,t.length);        }catch (Exception e) {}    } */}