在 Android Studio 中插入数据

Posted 2023-04-19

【中文标题】在 Android Studio 中插入数据

【英文标题】：data insert in Android Studio

【发布时间】：2021-11-28 01:13:36

【问题描述】：

我实际上正在研究 SQLite 数据库。我试图在我的数据库脚本中插入数据，以便稍后在 recyclerview 中显示它，而不是通过我在应用程序的前端输入它，而是直接在脚本中输入。我该怎么做？ 这是我的代码以便更好地理解

package com.example.tacoskingapp3;

import android.content.ClipData;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import androidx.annotation.Nullable;

public class ArticleManager extends SQLiteOpenHelper 

    public ArticleManager(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) 
        super(context, "Article.db", null, 1);
    

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) 
        String CreateTable = "CREATE TABLE articles (IdArticle INTEGER PRIMARY KEY  autoIncrement NOT NULL, NomArticle TEXT NOT NULL UNIQUE, TypeArticle TEXT NOT NULL, PrixArticle DECIMAL NOT NULL)";

        sqLiteDatabase.execSQL(CreateTable);
    

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVer, int newVer) 

    

【参考方案1】：

...但直接在脚本中...

您想使用单独的脚本将数据插入数据库吗？ （可能使用ADB命令来执行脚本之类的）

恐怕你做不到。 https://developer.android.com/training/data-storage/sqlite#DbHelper

关于您的描述，有一个简单的演示：click a button to insert data to DB，我重用了您的代码。看起来是这样的：

public class ArticleManager extends SQLiteOpenHelper 

    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "Article.db";
    public static final String TABLE_NAME = "articles";
    public static final String KEY_ID_ARTICLE = "IdArticle";
    public static final String KEY_NOM_ARTICLE = "NomArticle";
    public static final String KEY_TYPE_ARTICLE = "TypeArticle";
    public static final String KEY_PRIX_ARTICLE = "PrixArticle";

    private static final String SQL_CREATE_TABLE =
            "CREATE TABLE " + TABLE_NAME + " (" +
                    KEY_ID_ARTICLE + " INTEGER PRIMARY KEY  autoIncrement NOT NULL, " +
                    KEY_NOM_ARTICLE + " TEXT NOT NULL UNIQUE ," +
                    KEY_TYPE_ARTICLE + " TEXT NOT NULL ," +
                    KEY_PRIX_ARTICLE + " DECIMAL NOT NULL)";


    public ArticleManager(@Nullable Context context) 
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) 
        Log.d("ArticleManager", "TANCOLO===> SQL_CREATE_TABLE = " + SQL_CREATE_TABLE);
        sqLiteDatabase.execSQL(SQL_CREATE_TABLE);
    

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVer, int newVer) 
    

public class ArticleEntity 
    String NomArticle;
    String TypeArticle;
    double PrixArticle;

    ArticleEntity(String NomArticle, String TypeArticle, double PrixArticle) 
        this.NomArticle = NomArticle;
        this.TypeArticle = TypeArticle;
        this.PrixArticle = PrixArticle;
    

public class TestSqliteScript extends AppCompatActivity 

    private ArticleManager articleManager;
    private SQLiteDatabase db;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_sqlite_script);

        articleManager = new ArticleManager(this);
        db = articleManager.getWritableDatabase();

        findViewById(R.id.create_data_into_db).setOnClickListener( view ->
                createDataIntoDB()
        );
    

    private void createDataIntoDB() 
        //step 1, crate ArticleEntity list
        List<ArticleEntity> entities = new ArrayList();
        entities.add(new ArticleEntity("Nom article 01", "type 1", 100.0));
        entities.add(new ArticleEntity("Nom article 02", "type 2", 200.0));
        entities.add(new ArticleEntity("Nom article 03", "type 3", 300.0));
        entities.add(new ArticleEntity("Nom article 04", "type 4", 400.0));

        //step 2, insert the data to DB
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) 
            entities.forEach(entity -> 
                ContentValues values = new ContentValues();
                values.put(KEY_NOM_ARTICLE, entity.NomArticle);
                values.put(KEY_TYPE_ARTICLE, entity.TypeArticle);
                values.put(KEY_PRIX_ARTICLE, entity.PrixArticle);

                long newRowId = db.insert(TABLE_NAME, null, values);
                Log.d("TestSqliteScript", "TANCOLO===> newRowId = " + newRowId );
            );
        
    

    @Override
    protected void onDestroy() 
        db.close();

        super.onDestroy();
    

它有效：