深入浅析Android 项目中SQLite的数据表

import java.util.Arrays;import android.app.Activity;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class SecondActivity extends Activity {  public static final String TAG = "Debug Info";  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    ((Button)findViewById(R.id.btnQue)).setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {        MyDatabaseHelper dbhelper = new MyDatabaseHelper(SecondActivity.this, "BookStore.db", null, 1);        SQLiteDatabase db = dbhelper.getWritableDatabase();        //核心区        //读取系统表 sqlite_master        String sql = "select * from sqlite_master";        Cursor cursor = db.rawQuery(sql, null);        //打印表的所有列名        Log.i(TAG, Arrays.toString(cursor.getColumnNames()));        //打印当前数据库中的所有表        if (cursor.moveToFirst()) {          do {            String str = "";            for (String item : cursor.getColumnNames()) {              str += item + ": " + cursor.getString(cursor.getColumnIndex(item)) + "\n";            }            Log.i(TAG, str);          } while (cursor.moveToNext());        }      }    });  }}