Question

MainActivity.java：

public class MainActivity extends ActionBarActivity {

 private static final String SAMPLE_DB_NAME = "JBook";
 private static final String SAMPLE_TABLE_NAME = "Info";

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

     SQLiteDatabase sampleDB =  this.openOrCreateDatabase(SAMPLE_DB_NAME, MODE_PRIVATE, null);
        sampleDB.execSQL("CREATE TABLE IF NOT EXISTS " +
                SAMPLE_TABLE_NAME +
                " (LastName VARCHAR, FirstName VARCHAR," +
                " Rank VARCHAR);");
        sampleDB.execSQL("INSERT INTO " +
                SAMPLE_TABLE_NAME +
                " Values ('Kirk','James, T','Captain');");
        sampleDB.close();
        Toast.makeText(this, "DB Created!", Toast.LENGTH_LONG).show();}

这个程序没有错误。我想在点击按钮的同时通过textview（“krick，james，Captain”）显示值。使用简单的程序并进行注释.Plese提供简单的代码。

Answer 1

阅读本文： How to retrieve the data from my SQLite database and display them to a textView

希望这会对你有所帮助。

SQLiteDatabase sampleDB =  this.openOrCreateDatabase(SAMPLE_DB_NAME, MODE_PRIVATE, null);
Cursor returnCursor = sampleDB.rawQuery("select * from " + SAMPLE_TABLE_NAME, null);

if(returnCursor != null && returnCursor.moveToFirst()){
String txt1 = returnCursor.getString(0);
String txt2 = returnCursor.getString(1);
String txt3 = returnCursor.getString(2);
returnCursor.close(); 
}

我没有尝试过代码，可能会出现语法错误。

Android从sqlite获取数据

1 个答案: