刚刚开始在Android上,我试图创建一个简单的应用程序,它具有用于收集姓名和联系人号码的SQLite数据库。我创建了一个视图活动,它将使用simpleCursorAdapter在列表视图中显示内容(是的,它的折旧,但我还没有涉及使用自定义适配器。无论如何,到目前为止,代码编译就好了。当我点击按钮开始视图活动我得到一个SQLiteException没有这样的表
SQLite的例外:没有这样的表:clientTable(代码1):在编译:选择_id,姓名,手机FROM clientTable
下面是我的数据库类的代码。
package com.example.ideahutquizz;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class ClientDatabase extends SQLiteOpenHelper {
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "name";
public static final String KEY_MOBILE = "mobile";
public static final String DATABASE_NAME = "clientDatabase";
public static final String TABLE_NAME = "clientTable";
public static final int DATABASE_VERSION = 1;
String CREATE_TABLE = "create table"
+ TABLE_NAME + "("
+ KEY_ROWID + "INTEGER PRIMARY KEY AUTOINCREMENT,"
+ KEY_NAME + "TEXT NOT NULL,"
+ KEY_MOBILE + "TEXT NOT NULL" + ")";
public ClientDatabase(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(CREATE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
这里是视图活动的代码
package com.example.ideahutquizz;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class ViewDataActivity extends ActionBarActivity {
Button back;
ListView clientList;
SQLController clientDB;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_data);
clientList = (ListView)findViewById(R.id.listView1);
back = (Button)findViewById(R.id.button1);
clientDB = new SQLController(this);
clientDB.open();
Cursor cursor = clientDB.readData();
String[] from = new String[]{ClientDatabase.KEY_ROWID, ClientDatabase.KEY_NAME, ClientDatabase.KEY_MOBILE};
int[] to = new int[]{R.id.textView_id, R.id.textView_name, R.id.textView_mobile};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.listview_item_row, cursor, from, to);
adapter.notifyDataSetChanged();
clientList.setAdapter(adapter);
back.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
clientDB.close();
Intent back = new Intent(ViewDataActivity.this, ControlPanel.class);
startActivity(back);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.view_data, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
任何帮助,非常感谢。
更新....
我改变了create table语句如下,但我仍然得到...
private static final String CREATE_TABLE =
"create table " + TABLE_NAME + "("
+ KEY_ROWID + " integer primary key autoincrement,"
+ KEY_NAME + " text not null,"
+ KEY_MOBILE + " text not null" + ")";
还要卸载您的应用程序,以便在重新创建数据库时'onCreate()'中的问题变得明显。 http://stackoverflow.com/questions/21881992/when-is-sqliteopenhelper-oncreate-onupgrade-run – laalto 2014-09-02 19:25:09
我在eclipse模拟器上运行这个。我仍然需要卸载吗? – 2014-09-03 01:51:14
是的,在设备或模拟器上运行并没有什么区别。 – laalto 2014-09-03 04:48:16