導出數據庫文件爲文本或xml在android中

Question

您好我一直在尋找如何將我的數據庫導出爲XML或文本文件，但似乎無法找到我在找什麼。我遇到的所有教程和代碼snipets似乎都不能解釋我在找什麼。有沒有人知道任何教程或網站，說明我應該如何在這個時尚出口？

Answer 1

檢查以下

http://mgmblog.com/2009/02/06/export-an-android-sqlite-db-to-an-xml-file-on-the-sd-card/

Export sqlite database file into XML and then into Excel spreadsheet

Exporting a SQLite database to an XML file in Android

http://ashwinrayaprolu.wordpress.com/2011/03/15/android-database-example-database-usage-asynctask-database-export/

http://www.screaming-penguin.com/node/7749

Answer 2

public class DataXmlExporter extends DataBaseDemoActivity { 

    static final String DATASUBDIRECTORY = "bookwormdata"; 

    // private final SQLiteDatabase db; 
    private XmlBuilder xmlBuilder; 
    Button butt; 

    /* public DataXmlExporter(final SQLiteDatabase db) { 
     this.db = db; 

    }*/ 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main7); 


    butt=(Button)findViewById(R.id.exportxml); 
    String exportFileNamePrefix=exportxml; 
    // public void export(final String dbName, final String exportFileNamePrefix) throws IOException { 
     Log.i(Constants._COUNT, "exporting database - " + dbname + " exportFileNamePrefix=" + exportFileNamePrefix); 

     try { 
     xmlBuilder = new XmlBuilder(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
     xmlBuilder.start(dbname); 

     // get the tables 
     String sql = "select * from dept"; 
     Cursor c = db.rawQuery(sql, new String[0]); 

     if (c.moveToFirst()) { 

      //while (c.moveToNext()) { 
      String tableName ="dept";//c.getString(c.getColumnIndex("dep_id")); 

      // skip metadata, sequence, and uidx (unique indexes) 
      if (!tableName.equals("android_metadata") && !tableName.equals("sqlite_sequence") 
        && !tableName.startsWith("uidx")) { 
       try { 
       exportTable(tableName); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      } 
     // } 
     } 
     String xmlString = null; 
    try { 
     xmlString = xmlBuilder.end(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
     try { 
     writeToFile(xmlString, exportFileNamePrefix + ".xml"); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
     Log.i(Constants._COUNT, "exporting database complete"); 
     Toast.makeText(DataXmlExporter.this, "DB xml backup Successfully", 2000).show(); 

     butt.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       Intent intent = new Intent(DataXmlExporter.this, DataBaseDemoActivity.class); 
       startActivity(intent); 
         } 
     }); 
    } 

    private void exportTable(final String tableName) throws IOException { 
     xmlBuilder.openTable(tableName); 
     String sql = "select * from " + tableName; 
     Cursor c = db.rawQuery(sql, new String[0]); 
     if (c.moveToFirst()) { 
     int cols = c.getColumnCount(); 
     do { 
      xmlBuilder.openRow(); 
      for (int i = 0; i < cols; i++) { 
       /*if(i==6) 
       { 
        //String id = c.getString(c.getColumnIndex("photo")); 
        String str = new String(image); 
        xmlBuilder.addColumn(c.getColumnName(i), str); 
       }*/ 
       xmlBuilder.addColumn(c.getColumnName(i), c.getString(i)); 
      } 
      xmlBuilder.closeRow(); 
     } while (c.moveToNext()); 
     } 
     c.close(); 
     xmlBuilder.closeTable(); 
    } 

    private void writeToFile(final String xmlString, final String exportFileName) throws IOException { 
     File dir = new File(Environment.getExternalStorageDirectory(), DataXmlExporter.DATASUBDIRECTORY); 
     if (!dir.exists()) { 
     dir.mkdirs(); 
     } 
     File file = new File(dir, exportFileName); 
     file.createNewFile(); 

     ByteBuffer buff = ByteBuffer.wrap(xmlString.getBytes()); 
     FileChannel channel = new FileOutputStream(file).getChannel(); 
     try { 
     channel.write(buff); 
     } finally { 
     if (channel != null) { 
      channel.close(); 
     } 
     } 
    } 

    /** 
    * XmlBuilder is used to write XML tags (open and close, and a few attributes) 
    * to a StringBuilder. Here we have nothing to do with IO or SQL, just a fancy StringBuilder. 
    * 
    * @author ccollins 
    * 
    */ 
    static class XmlBuilder { 
     private static final String OPEN_XML_STANZA = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"; 
     private static final String CLOSE_WITH_TICK = "'>"; 
     private static final String DB_OPEN = "<database name='"; 
     private static final String DB_CLOSE = "</database>"; 
     private static final String TABLE_OPEN = "<table name='"; 
     private static final String TABLE_CLOSE = "</table>"; 
     private static final String ROW_OPEN = "<row>"; 
     private static final String ROW_CLOSE = "</row>"; 
     private static final String COL_OPEN = "<col name='"; 
     private static final String COL_CLOSE = "</col>"; 

     private final StringBuilder sb; 

     public XmlBuilder() throws IOException { 
     sb = new StringBuilder(); 
     } 

     void start(final String dbName) { 
     sb.append(XmlBuilder.OPEN_XML_STANZA); 
     sb.append(XmlBuilder.DB_OPEN + dbName + XmlBuilder.CLOSE_WITH_TICK); 
     } 

     String end() throws IOException { 
     sb.append(XmlBuilder.DB_CLOSE); 
     return sb.toString(); 
     } 

     void openTable(final String tableName) { 
     sb.append(XmlBuilder.TABLE_OPEN + tableName + XmlBuilder.CLOSE_WITH_TICK); 
     } 

     void closeTable() { 
     sb.append(XmlBuilder.TABLE_CLOSE); 
     } 

     void openRow() { 
     sb.append(XmlBuilder.ROW_OPEN); 
     } 

     void closeRow() { 
     sb.append(XmlBuilder.ROW_CLOSE); 
     } 

     void addColumn(final String name, final String val) throws IOException { 
     sb.append(XmlBuilder.COL_OPEN + name + XmlBuilder.CLOSE_WITH_TICK + val + XmlBuilder.COL_CLOSE); 
     } 
    } 

} 

試試這個。這對我有用。