dbContentProvider

package com.example.contextprovider;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

public class dbContentProvider extends ContentProvider {

    public static final int TABLE1_DIR = 0; //访问表1的所有数据
      public static final int TABLE1_ITEM = 1; //访问表1的单条数据
      public static final int TABLE2_DIR = 2;
      public static final int TABLE2_ITEM = 3;

    static {
        UriMatcher uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
                 uriMatcher.addURI("com.example.app.provider","table1",TABLE1_DIR);
                 uriMatcher.addURI("com.example.app.provider","table1/#",TABLE1_ITEM);
                 uriMatcher.addURI("com.example.app.provider","table2",TABLE2_DIR);
                 uriMatcher.addURI("com.example.app.provider","table2/#",TABLE2_ITEM);
             }


    private static UriMatcher uriMatcher;
    public boolean onCreate() {
        return false;
    }

    @Nullable
    @Override
    public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection, @Nullable String[] selectionArgs, @Nullable String sortOrder) {
        switch(uriMatcher.match(uri)){
        case TABLE1_DIR:
            break;
            case TABLE1_ITEM:
                break;
                    case TABLE2_DIR:

                         break;
                   case TABLE2_ITEM:
                         //查询table2表中的单条数据
                         break;
                     default:
                         break;
               }
        return null;
    }

    @Nullable
    @Override
    public String getType(@NonNull Uri uri) {
        return null;
    }

    @Nullable
    @Override
    public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {
        return null;
    }

    @Override
    public int delete(@NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {
        return 0;
    }

    @Override
    public int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {
        return 0;
    }
}