Androidアプリケーション開発のContentProvider

  
  
  
  

   
   
   
   
package cn.class3g.db;  
   
   
   
   
   
   
   
   
   
import cn.class3g.service.DatabaseHelper;  
   
   
   
   
import android.content.ContentProvider;  
   
   
   
   
import android.content.ContentUris;  
   
   
   
   
import android.content.ContentValues;  
   
   
   
   
import android.content.UriMatcher;  
   
   
   
   
import android.database.Cursor;  
   
   
   
   
import android.database.sqlite.SQLiteDatabase;  
   
   
   
   
import android.net.Uri;  
   
   
   
   
   
   
   
   
   
public class PersonProvider extends ContentProvider {  
   
   
   
   
       private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);  
   
   
   
   
   
   
   
   
   
       private static final int PERSONS = 1;  
   
   
   
   
       private static final int PERSON = 2;  
   
   
   
   
   
   
   
   
   
       private DatabaseHelper dbHelper;  
   
   
   
   
   
   
   
   
   
       static {  
   
   
   
   
              matcher.addURI("cn.class3g.providers.personprovider", "person", PERSONS);  
   
   
   
   
              matcher.addURI("cn.class3g.providers.personprovider", "person/#",  
   
   
   
   
                            PERSON);  
   
   
   
   
       }  
   
   
   
   
   
   
   
   
   
       public boolean onCreate() {  
   
   
   
   
              dbHelper = new DatabaseHelper(this.getContext());  
   
   
   
   
              return true;  
   
   
   
   
       }  
   
   
   
   
   
   
   
   
   
       //  content://cn.itcast.provides.personprovider/person  
   
   
   
   
       public Uri insert(Uri uri, ContentValues values) {  
   
   
   
   
              SQLiteDatabase db = dbHelper.getWritableDatabase();  
   
   
   
   
              long rowId;  
   
   
   
   
   
   
   
   
   
              switch (matcher.match(uri)) {  
   
   
   
   
              case PERSONS: //                
   
   
   
   
                     rowId = db.insert("person", "personid", values);  
   
   
   
   
                     return ContentUris.withAppendedId(uri, rowId);  
   
   
   
   
              default:  
   
   
   
   
                     throw new IllegalArgumentException("Unknow Uri:" + uri);  
   
   
   
   
              }  
   
   
   
   
       }  
   
   
   
   
   
   
   
   
   
       public Cursor query(Uri uri, String[] projection, String selection,  
   
   
   
   
                     String[] selectionArgs, String sortOrder) {  
   
   
   
   
              SQLiteDatabase db = dbHelper.getReadableDatabase();  
   
   
   
   
              switch (matcher.match(uri)) {  
   
   
   
   
              case PERSONS:  
   
   
   
   
                     return db.query("person", projection, selection, selectionArgs, null, null, sortOrder);  
   
   
   
   
              case PERSON:  
   
   
   
   
                     long personid = ContentUris.parseId(uri);  
   
   
   
   
                     String where = "personid="+ personid;  
   
   
   
   
                     if(selection!=null && !"".equals(selection)){  
   
   
   
   
                            where = where + " and "+ selection;  
   
   
   
   
                     }  
   
   
   
   
                     return db.query("person", projection, where, selectionArgs, null, null, sortOrder);  
   
   
   
   
                      
   
   
   
   
              default:  
   
   
   
   
                     throw new IllegalArgumentException("Unknown Uri:"+ uri);  
   
   
   
   
              }  
   
   
   
   
       }  
   
   
   
   
   
   
   
   
   
       //  content://cn.itcast.provides.personprovider/person            
   
   
   
   
       //  content://cn.itcast.provides.personprovider/person/10       id     
   
   
   
   
       public int update(Uri uri, ContentValues values, String selection,  
   
   
   
   
                     String[] selectionArgs) {  
   
   
   
   
              SQLiteDatabase db = dbHelper.getWritableDatabase();  
   
   
   
   
              int num;  
   
   
   
   
              switch(matcher.match(uri)){  
   
   
   
   
              case PERSONS: //        
   
   
   
   
                     num = db.update("person", values, selection, selectionArgs);  
   
   
   
   
                     break;  
   
   
   
   
              case PERSON:  
   
   
   
   
                     long personid = ContentUris.parseId(uri);  
   
   
   
   
                     String where = "personid=" + personid;  
   
   
   
   
                     if(selection != null){  
   
   
   
   
                            where += " and " + selection;  
   
   
   
   
                     }  
   
   
   
   
                     num = db.update("person", values, where, selectionArgs);  
   
   
   
   
                     break;  
   
   
   
   
              default:  
   
   
   
   
                     throw new IllegalArgumentException("Unknow Uri"+uri);  
   
   
   
   
              }  
   
   
   
   
              return num;  
   
   
   
   
       }  
   
   
   
   
   
   
   
   
   
       public int delete(Uri uri, String selection, String[] selectionArgs) {  
   
   
   
   
              SQLiteDatabase db = dbHelper.getWritableDatabase();  
   
   
   
   
              int num = 0;  
   
   
   
   
              switch (matcher.match(uri)) {  
   
   
   
   
              case PERSONS:  
   
   
   
   
                     num = db.delete("person", selection, selectionArgs);  
   
   
   
   
                     break;  
   
   
   
   
              case PERSON:  
   
   
   
   
                     long personid = ContentUris.parseId(uri);  
   
   
   
   
                     String where = "personid="+ personid;  
   
   
   
   
                     if(selection!=null && !"".equals(selection)){  
   
   
   
   
                            where = where + " and "+ selection;  
   
   
   
   
                     }  
   
   
   
   
                     num = db.delete("person", where, selectionArgs);  
   
   
   
   
                     break;      
   
   
   
   
              default:  
   
   
   
   
                     throw new IllegalArgumentException("Unknown Uri:"+ uri);  
   
   
   
   
              }  
   
   
   
   
              return num;  
   
   
   
   
       }  
   
   
   
   
   
   
   
   
   
       public String getType(Uri uri) {  
   
   
   
   
              switch (matcher.match(uri)) {  
   
   
   
   
              case PERSONS:  
   
   
   
   
                     return "vnd.android.cursor.dir/person";  
   
   
   
   
              case PERSON:  
   
   
   
   
                     return "vnd.android.cursor.item/person";  
   
   
   
   
              default:  
   
   
   
   
                     throw new IllegalArgumentException("Unknown Uri:"+ uri);  
   
   
   
   
              }  
   
   
   
   
       }  
   
   
   
   
}