ADD file via upload

Database.java

@@ -0,0 +1,52 @@
+package com.example.picture_share;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.widget.Toast;
+
+import androidx.annotation.Nullable;
+
+public class Database extends SQLiteOpenHelper {
+
+    private static final String dbname="mydb";
+
+    private Context mContext;
+   public Database(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) {
+
+        super(context, name, factory, version);
+        mContext=context;
+    }
+
+    public Database(Context context){
+        super(context,"mydb",null,1);
+        mContext=context;
+    }
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+
+        //创建一个用户表，包括所有用户，里面有id，密码，用户名和头像
+        db.execSQL("create table if not exists users"+
+                "(id text primary key," +
+                "password text not null,"+
+                "name text ,"+
+                "touxiang blob)");
+
+        //创建一个图片表，存储图片,图片的id，详细信息，以及发布的用户id和图片
+        db.execSQL("create table if not exists picturestable"+
+                "(idnum text ,"+
+                "details text,"+
+                "usrerid text,"+
+                "pictures blob)");
+        //创建一个收藏点赞表，存放图片id，个人账号
+        db.execSQL("create table if not exists personlikes"+
+                "(idnum text ,"+
+                "usrerid text)");
+        Toast.makeText(mContext,"数据库创建成功", Toast.LENGTH_SHORT).show();
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+
+    }
+}