Android开发数据库Sqlite1

大道之行，天下为公。这篇文章主要讲述Android开发数据库Sqlite1相关的知识，希望能为你提供帮助。
1.数据库的创建
DatabaseHelper.java

package com.xrj.databasedemo; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import androidx.annotation.Nullable; public class DatabaseHelper extends SQLiteOpenHelper {/* context 上下文 name 数据库名称 factory 游标工厂 version 版本号 */ public DatabaseHelper(@Nullable Context context) { super(context, Constants.DATABASE_NAME, null, Constants.VERSION_CODE); }@Override public void onCreate(SQLiteDatabase db) {}@Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {} }

Constants.java

package com.xrj.databasedemo; public class Constants { public static final String DATABASE_NAME = "first.db"; public static final int VERSION_CODE = 1; }

MainActivity.java

package com.xrj.databasedemo; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //创建数据库 DatabaseHelper helper = new DatabaseHelper(this); helper.getWritableDatabase(); } }

在monitor导出first.db，导入可视化