Question

在我的应用程序中，我有一个ID_CLI NAME_CLI WHERE_CLI 2345 IGOR LVIV 4566 OLEG KIEV 1234 GIAN REGGIO，其中包含以下结构和数据

（这只是一个例子）

MainActivity

现在我的EditText我有一个Button和一个EditText 2345，所以如果我输入Button，我会按TextView我那将在2345 IGOR LVIV中打印public class DataBaseHandler extends SQLiteOpenHelper { private static DataBaseHandler sInstance; private static final String DATABASE_NAME = "Clienti.db"; private static final String TABLE_CLIENTS = "clienti_table"; private static final String ID_CLI = "ID_CLI"; private static final String COD_CLI = "COD_CLI"; private static final String RS1_CLI = "RS1_CLI"; public static synchronized DataBaseHandler getInstance(Context context) { // Per inizializzare il db in altre activities inserire : // DataBaseHandler myDB; // myDB = DataBaseHandler.getInstance(this); if (sInstance == null) { sInstance = new DataBaseHandler(context.getApplicationContext()); } return sInstance; } private DataBaseHandler(Context context) { super(context, DATABASE_NAME, null, 1); } @Override public void onCreate(SQLiteDatabase db) { String CREATE_TABLE_CLIENTS = "CREATE TABLE IF NOT EXISTS " + TABLE_CLIENTS + " (ID_CLI TEXT,COD_CLI TEXT,RS1 TEXT)"; db.execSQL(CREATE_TABLE_CLIENTS); } @Override public void onUpgrade(SQLiteDatabase db, int i, int i1) { db.execSQL("DROP TABLE IF EXISTS " + TABLE_CLIENTS); onCreate(db); } public void insertCLI(String ID,String COD,String RS1){ SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(ID_CLI,ID); values.put(COD_CLI,COD); values.put(RS1_CLI,RS1); db.insertWithOnConflict(TABLE_CLIENTI, null, values, SQLiteDatabase.CONFLICT_REPLACE); } public Cursor getDataTable() { SQLiteDatabase db = this.getWritableDatabase(); return db.rawQuery("SELECT * FROM " + TABLE_CLIENTS); } }

实际上我还在网上搜索过类似的东西，但还没找到任何可以解决我问题的东西。

您对我该怎么办有任何建议吗？

这是我的数据库

public override void OnCreate()
{
    // your code
    base.OnCreate();
}

Answer 1

在数据库处理程序类

中添加此方法

public static String dbRawSearch(String id) {
   String dbString = "";
   SQLiteDatabase db = this.getWritableDatabase();
   String query = "SELECT * FROM " + TABLE_CLIENTS + " WHERE ID_CLI = " + id";
   //Cursor points to a location in your results
   Cursor c = db.rawQuery(query, null);
   //Move to the first row in your results
   c.moveToFirst();
   //Position after the last row means the end of the results
   while (!c.isAfterLast()) {
       if (c.getString(c.getColumnIndex("ID_CLI")) != null) {
           dbString += c.getString(c.getColumnIndex("ID_CLI")) + "   " + c.getString(c.getColumnIndex("NAME_CLI")) + "   " + c.getString(c.getColumnIndex("WHERE_CLI"));
           dbString += "\n";
       }
       c.moveToNext();
   }
   db.close();
   return dbString;
}

然后转到您的活动，在初始化editText，button和textView之后，执行以下操作：

DataBaseHandler dbHandler = new DataBaseHandler(this);
String searchKeyword = "";
String result = "";
yourButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(!TextUtils.isEmpty(yourEditText.getText().toString())) {
             searchKeyWord = yourEditText.getText().toString();
             result = dbHandler.dbRawSearch(searchKeyWord );
             if(result != null){
              yourTextView.setText(result);
             }
           }
        }
    });

Answer 2

在DataBaseHandler班级

中添加方法

public Cursor getRowByIdCli(String idCli){

   SQLiteDatabase db = this.getWritableDatabase();
   return db.rawQuery("SELECT * FROM " + TABLE_CLIENTS + " WHERE ID_CLI = ? ", new String[]{idCli} );
}

如何检查字符串是否等于SQlite中的一行并打印整行？

2 个答案: