{"id":318,"date":"2007-10-17T00:00:00","date_gmt":"2007-10-17T00:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=318"},"modified":"2007-10-17T00:00:00","modified_gmt":"2007-10-17T00:00:00","slug":"J2ME : Store Database","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=318","title":{"rendered":"J2ME : Store Database"},"content":{"rendered":"

import <\/STRONG><\/FONT>java.io.*;<\/FONT>
import <\/B><\/FONT>javax.microedition.midlet.*;<\/FONT>
import <\/B><\/FONT>javax.microedition.rms.*;<\/FONT>
<\/FONT>
public class <\/B><\/FONT>TestStore <\/FONT>extends <\/B><\/FONT>MIDlet <\/FONT>{<\/FONT>
<\/FONT>
    <\/FONT>static final <\/B><\/FONT>String DBNAME = <\/FONT>“mydata”<\/FONT>;<\/FONT>
<\/FONT>
    <\/FONT>public <\/B><\/FONT>TestStore<\/FONT>() {<\/FONT>
<\/FONT>
        <\/FONT>RecordStore rs = <\/FONT>null<\/B><\/FONT>;<\/FONT>
<\/FONT>
        <\/FONT>\/\/ Data is persistent across MIDlet invocations.<\/FONT>
        <\/FONT>\/\/ So, first clear out the old record store…<\/FONT>
<\/FONT>
        <\/FONT>try <\/B><\/FONT>{<\/FONT>
            <\/FONT>RecordStore.deleteRecordStore<\/FONT>( <\/FONT>DBNAME <\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
        <\/FONT>catch<\/B><\/FONT>( <\/FONT>Exception e <\/FONT>){<\/FONT>
            <\/FONT>\/\/ ignore any errors…<\/FONT>
        <\/FONT>}<\/FONT>
<\/FONT>
        <\/FONT>\/\/ Now create a new one and dump<\/FONT>
        <\/FONT>\/\/ each element out….<\/FONT>
<\/FONT>
        <\/FONT>try <\/B><\/FONT>{<\/FONT>
            <\/FONT>rs = RecordStore.openRecordStore<\/FONT>( <\/FONT>DBNAME,<\/FONT>
                                              <\/FONT>true <\/B><\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
            <\/FONT>byte<\/B><\/FONT>[] <\/FONT>data1 = <\/FONT>“Here is the first record”<\/FONT>.getBytes<\/FONT>()<\/FONT>;<\/FONT>
            <\/FONT>byte<\/B><\/FONT>[] <\/FONT>data2 = <\/FONT>“And here is the second”<\/FONT>.getBytes<\/FONT>()<\/FONT>;<\/FONT>
            <\/FONT>byte<\/B><\/FONT>[] <\/FONT>data3 = <\/FONT>“And then the third”<\/FONT>.getBytes<\/FONT>()<\/FONT>;<\/FONT>
<\/FONT>
            <\/FONT>data3<\/FONT>[<\/FONT>0<\/FONT>] <\/FONT>= <\/FONT>0<\/FONT>;<\/FONT>
            <\/FONT>data3<\/FONT>[<\/FONT>data3.length-<\/FONT>1<\/FONT>] <\/FONT>= <\/FONT>(<\/FONT>byte<\/B><\/FONT>) <\/FONT>–<\/FONT>1<\/FONT>;<\/FONT>
<\/FONT>
            <\/FONT>rs.addRecord<\/FONT>( <\/FONT>data1, <\/FONT>0<\/FONT>, data1.length <\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>rs.addRecord<\/FONT>( <\/FONT>data2, <\/FONT>0<\/FONT>, data2.length <\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>rs.addRecord<\/FONT>( <\/FONT>data3, <\/FONT>0<\/FONT>, data3.length <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
            <\/FONT>dumpRecordStore<\/FONT>( <\/FONT>rs, System.out <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
<\/FONT>
            <\/FONT>rs.closeRecordStore<\/FONT>()<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
        <\/FONT>catch<\/B><\/FONT>( <\/FONT>RecordStoreException e <\/FONT>){<\/FONT>
            <\/FONT>System.out.println<\/FONT>( <\/FONT>e <\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
<\/FONT>
        <\/FONT>notifyDestroyed<\/FONT>()<\/FONT>;<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>dumpRecordStore<\/FONT>( <\/FONT>RecordStore rs,<\/FONT>
                                 <\/FONT>PrintStream out <\/FONT>)<\/FONT>
    <\/FONT>{<\/FONT>
        <\/FONT>if<\/B><\/FONT>( <\/FONT>rs == <\/FONT>null <\/B><\/FONT>) <\/FONT>return<\/B><\/FONT>;<\/FONT>
<\/FONT>
        <\/FONT>StringBuffer hexLine = <\/FONT>new <\/B><\/FONT>StringBuffer<\/FONT>()<\/FONT>;<\/FONT>
        <\/FONT>StringBuffer charLine = <\/FONT>new <\/B><\/FONT>StringBuffer<\/FONT>()<\/FONT>;<\/FONT>
<\/FONT>
        <\/FONT>try <\/B><\/FONT>{<\/FONT>
            <\/FONT>int    <\/B><\/FONT>lastID = rs.getNextRecordID<\/FONT>()<\/FONT>;<\/FONT>
            <\/FONT>byte<\/B><\/FONT>[] <\/FONT>data = <\/FONT>new <\/B><\/FONT>byte<\/B><\/FONT>[<\/FONT>100<\/FONT>]<\/FONT>;<\/FONT>
            <\/FONT>int    <\/B><\/FONT>size;<\/FONT>
<\/FONT>
            <\/FONT>for<\/B><\/FONT>( <\/FONT>int <\/B><\/FONT>i = <\/FONT>1<\/FONT>; i < lastID; ++i <\/FONT>){<\/FONT>
                <\/FONT>try <\/B><\/FONT>{<\/FONT>
                    <\/FONT>size = rs.getRecordSize<\/FONT>( <\/FONT>i <\/FONT>)<\/FONT>;<\/FONT>
                    <\/FONT>if<\/B><\/FONT>( <\/FONT>size > data.length <\/FONT>){<\/FONT>
                        <\/FONT>data = <\/FONT>new <\/B><\/FONT>byte<\/B><\/FONT>[ <\/FONT>size * <\/FONT>2 <\/FONT>]<\/FONT>;<\/FONT>
                    <\/FONT>}<\/FONT>
<\/FONT>
                    <\/FONT>out.println<\/FONT>( <\/FONT>“Record ” <\/FONT>+ i +<\/FONT>
                              <\/FONT>” of size ” <\/FONT>+ size <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
                    <\/FONT>rs.getRecord<\/FONT>( <\/FONT>i, data, <\/FONT>0 <\/FONT>)<\/FONT>;<\/FONT>
                    <\/FONT>dumpRecord<\/FONT>( <\/FONT>data, size, out,<\/FONT>
                           <\/FONT>hexLine, charLine, <\/FONT>16 <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
                    <\/FONT>out.println<\/FONT>( <\/FONT>“” <\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>}<\/FONT>
                <\/FONT>catch<\/B><\/FONT>( <\/FONT>InvalidRecordIDException e <\/FONT>){<\/FONT>
                    <\/FONT>continue<\/B><\/FONT>;<\/FONT>
                <\/FONT>}<\/FONT>
            <\/FONT>}<\/FONT>
        <\/FONT>}<\/FONT>
<\/FONT>
        <\/FONT>catch<\/B><\/FONT>( <\/FONT>RecordStoreException e <\/FONT>){<\/FONT>
            <\/FONT>out.println<\/FONT>( <\/FONT>“Exception reading record store: ” <\/FONT>+ e <\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>private <\/B><\/FONT>void <\/B><\/FONT>dumpRecord<\/FONT>( <\/FONT>byte<\/B><\/FONT>[] <\/FONT>data, <\/FONT>int <\/B><\/FONT>size,<\/FONT>
                             <\/FONT>PrintStream out,<\/FONT>
                             <\/FONT>StringBuffer hexLine,<\/FONT>
                             <\/FONT>StringBuffer charLine,<\/FONT>
                             <\/FONT>int <\/B><\/FONT>maxLen <\/FONT>)<\/FONT>
    <\/FONT>{<\/FONT>
        <\/FONT>if<\/B><\/FONT>( <\/FONT>size == <\/FONT>0 <\/FONT>) <\/FONT>return<\/B><\/FONT>;<\/FONT>
<\/FONT>
        <\/FONT>hexLine.setLength<\/FONT>( <\/FONT>0 <\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>charLine.setLength<\/FONT>( <\/FONT>0 <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
        <\/FONT>int <\/B><\/FONT>count = <\/FONT>0<\/FONT>;<\/FONT>
<\/FONT>
        <\/FONT>for<\/B><\/FONT>( <\/FONT>int <\/B><\/FONT>i = <\/FONT>0<\/FONT>; i < size; ++i <\/FONT>){<\/FONT>
            <\/FONT>char <\/B><\/FONT>b = <\/FONT>(<\/FONT>char<\/B><\/FONT>) ( <\/FONT>data<\/FONT>[<\/FONT>i<\/FONT>] <\/FONT>& <\/FONT>0xFF <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
            <\/FONT>if<\/B><\/FONT>( <\/FONT>b < <\/FONT>0x10 <\/FONT>){<\/FONT>
                <\/FONT>hexLine.append<\/FONT>( <\/FONT>‘0’ <\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>}<\/FONT>
<\/FONT>
            <\/FONT>hexLine.append<\/FONT>( <\/FONT>Integer.toHexString<\/FONT>( <\/FONT>b <\/FONT>) )<\/FONT>;<\/FONT>
            <\/FONT>hexLine.append<\/FONT>( <\/FONT>‘ ‘ <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
            <\/FONT>if<\/B><\/FONT>( ( <\/FONT>b >= <\/FONT>32 <\/FONT>&& b <= <\/FONT>127 <\/FONT>) <\/FONT>||<\/FONT>
                <\/FONT>Character.isDigit<\/FONT>( <\/FONT>b <\/FONT>) <\/FONT>||<\/FONT>
                <\/FONT>Character.isLowerCase<\/FONT>( <\/FONT>b <\/FONT>) <\/FONT>||<\/FONT>
                <\/FONT>Character.isUpperCase<\/FONT>( <\/FONT>b <\/FONT>) ){<\/FONT>
                <\/FONT>charLine.append<\/FONT>( (<\/FONT>char<\/B><\/FONT>) <\/FONT>b <\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>} <\/FONT>else <\/B><\/FONT>{<\/FONT>
                <\/FONT>charLine.append<\/FONT>( <\/FONT>‘.’ <\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>}<\/FONT>
<\/FONT>
            <\/FONT>if<\/B><\/FONT>( <\/FONT>++count >= maxLen || i == size-<\/FONT>1 <\/FONT>){<\/FONT>
                <\/FONT>while<\/B><\/FONT>( <\/FONT>count++ < maxLen <\/FONT>){<\/FONT>
                <\/FONT>hexLine.append<\/FONT>( <\/FONT>”   ” <\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>}<\/FONT>
<\/FONT>
                <\/FONT>hexLine.append<\/FONT>( <\/FONT>‘ ‘ <\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>hexLine.append<\/FONT>( <\/FONT>charLine.toString<\/FONT>() )<\/FONT>;<\/FONT>
<\/FONT>
                <\/FONT>out.println<\/FONT>( <\/FONT>hexLine.toString<\/FONT>() )<\/FONT>;<\/FONT>
 <\/FONT>
                <\/FONT>hexLine.setLength<\/FONT>( <\/FONT>0 <\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>charLine.setLength<\/FONT>( <\/FONT>0 <\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>count = <\/FONT>0<\/FONT>;<\/FONT>
            <\/FONT>}<\/FONT>
        <\/FONT>}<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>destroyApp<\/FONT>( <\/FONT>boolean <\/B><\/FONT>unconditional <\/FONT>) {<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>startApp<\/FONT>() {<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>pauseApp<\/FONT>() {<\/FONT>
    <\/FONT>}<\/FONT>
}<\/FONT><\/FONT>

\n

<\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"

import java.io.*;import javax.microedition.midlet.*;import javax.microedition.rms.*;public class TestStore extends MIDlet {    static final String DBNAME = “mydata”;    public TestStore() {        RecordStore rs = null;        \/\/ Data is persistent across MIDlet invocations.        \/\/ So, first clear out the old record store…        try {            RecordStore.deleteRecordStore( DBNAME );        }        catch( Exception e ){            \/\/ ignore any errors…        }        \/\/ Now create a new one and dump        \/\/ each element out….        try {            rs = RecordStore.openRecordStore( DBNAME,                                              true );            byte[] data1 = “Here is the first record”.getBytes();            byte[] data2 = “And here is the second”.getBytes();            byte[] data3 = “And then the third”.getBytes();            data3[0] = 0;            data3[data3.length-1] = (byte) –1;            rs.addRecord( data1, 0, data1.length );            rs.addRecord( data2, 0, data2.length );            rs.addRecord( data3, 0, data3.length );            dumpRecordStore( rs, System.out );            rs.closeRecordStore();        }        catch( RecordStoreException e ){            System.out.println( e );        }        notifyDestroyed();    }    public void dumpRecordStore( RecordStore rs,                                 PrintStream out )    {        if( rs == null ) return;        StringBuffer hexLine = new StringBuffer();        StringBuffer charLine = new StringBuffer();        try {            int    lastID = rs.getNextRecordID();            byte[] data = new byte[100];            int    size;            for( int i = 1; i < lastID; ++i ){                try {                    size = rs.getRecordSize( i );                    if( size > data.length ){                        data = new byte[ size * 2 ];                    }                    out.println( “Record ” + i +                              ” of size ” + size );                    rs.getRecord( i, data, 0 );                    dumpRecord( data, size, out,                           hexLine, charLine, 16 );                    out.println( “” );                }                catch( InvalidRecordIDException e ){                    continue;                }            }        }        catch( RecordStoreException e ){            out.println( “Exception reading record store: ” + e );        }    }    private void dumpRecord( byte[] data, int size,                             PrintStream out,                             StringBuffer hexLine,                             StringBuffer charLine,                             int maxLen )    {        if( size == 0 ) return;        hexLine.setLength( 0 );        charLine.setLength( 0 );        int count = 0;        for( int i = 0; i < size; ++i ){            char b = (char) ( data[i] & 0xFF );            if( b < 0x10 ){                hexLine.append( ‘0’ );            }            hexLine.append( Integer.toHexString( b ) );            hexLine.append( ‘ ‘ );            if( ( b >= 32 && b <= 127 ) ||                Character.isDigit( b ) ||                Character.isLowerCase( b ) ||                Character.isUpperCase( b ) ){                charLine.append( (char) b );            } else {                charLine.append( ‘.’ );            }            if( ++count >= maxLen || i == size-1 ){                while( count++ < maxLen ){                hexLine.append( ”   ” );                }                hexLine.append( ‘ ‘ );                hexLine.append( charLine.toString() );                out.println( hexLine.toString() );                 hexLine.setLength( 0 );                charLine.setLength( 0 );                count = 0;            }        }    }    public void destroyApp( boolean unconditional ) {    }    public void startApp() {    }    public void pauseApp() {    }}<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-318","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/318","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=318"}],"version-history":[{"count":0,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/318\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=318"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/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