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我正在尝试学习 SQLite，尝试基本的东西并且（如预期的那样）它并没有真正起作用。

我试图创建另一个数据库（不同的文件），但错误仍然存​​在。

03-05 17:20:18.989: D/myLogs(1323): --- Insert in mytable: ---
03-05 17:20:18.999: E/SQLiteLog(1323): (1) table mytable has no column named date
03-05 17:20:19.199: E/SQLiteDatabase(1323): Error inserting time=asd date=asd glucose=adf
03-05 17:20:19.199: E/SQLiteDatabase(1323): android.database.sqlite.SQLiteException: table mytable has no column named date (code 1): , while compiling: INSERT INTO mytable(time,date,glucose) VALUES (?,?,?)

这里是 LogCat 输出：http ://s15.postimage.org/soak9ifbf/androidlog.png （不能添加图片，必须给你一个链接）

基本上，它说，没有名为“日期”的列

这是代码：

package com.example.prototype2;



import android.os.Bundle;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
 import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.support.v4.app.NavUtils;

 public class AddGlucose extends Activity implements OnClickListener {

final String LOG_TAG = "myLogs";

Button btnAdd, btnRead, btnClear;
  EditText etGlucose, etTime, etDate;

  DBHelper dbHelper;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_glucose);
    // Show the Up button in the action bar.
    setupActionBar();

    btnAdd = (Button) findViewById(R.id.btnAdd);
    btnAdd.setOnClickListener(this);

    btnRead = (Button) findViewById(R.id.btnRead);
    btnRead.setOnClickListener(this);

    btnClear = (Button) findViewById(R.id.btnClear);
    btnClear.setOnClickListener(this);

    etGlucose = (EditText) findViewById(R.id.etGlucose);
    etTime = (EditText) findViewById(R.id.etTime);
    etDate = (EditText) findViewById(R.id.etDate);
    dbHelper = new DBHelper(this);
}

/**
 * Set up the {@link android.app.ActionBar}.
 */
private void setupActionBar() {

    getActionBar().setDisplayHomeAsUpEnabled(true);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.add_glucose, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
        // This ID represents the Home or Up button. In the case of this
        // activity, the Up button is shown. Use NavUtils to allow users
        // to navigate up one level in the application structure. For
        // more details, see the Navigation pattern on Android Design:
        //
        // http://developer.android.com/design/patterns/navigation.html#up-vs-back
        //
        NavUtils.navigateUpFromSameTask(this);
        return true;
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    ContentValues cv = new ContentValues();
    String glucose = etGlucose.getText().toString();
    String time = etTime.getText().toString();
    String date = etDate.getText().toString();

    SQLiteDatabase db = dbHelper.getWritableDatabase();

    switch (v.getId()) {
    case R.id.btnAdd:
      Log.d(LOG_TAG, "--- Insert in mytable: ---");

      cv.put("glucose", glucose);
      cv.put("time", time);
      cv.put("date", date);
    long rowID = db.insert("mytable", null, cv);
      Log.d(LOG_TAG, "row inserted, ID = " + rowID);
      break;

    case R.id.btnRead:
        Log.d(LOG_TAG, "--- Rows in mytable: ---");
        Cursor c = db.query("mytable", null, null, null, null, null, null, null);
        if (c.moveToFirst()) {
            int idColIndex = c.getColumnIndex("id");
            int glucoseColIndex = c.getColumnIndex("glucose");
            int timeColIndex = c.getColumnIndex("time");
            int dateColIndex = c.getColumnIndex("date");

            do {    

                Log.d(LOG_TAG,
                        "ID = " + c.getInt(idColIndex) + 
                        ", glucose = " + c.getString(glucoseColIndex) +
                        ", time = " + c.getString(timeColIndex) + ", date = " + c.getString(dateColIndex));
            } while (c.moveToNext());
        } else
            Log.d(LOG_TAG, "0 rows");
        c.close();
        break;

case R.id.btnClear:
      Log.d(LOG_TAG, "--- Clear mytable: ---");

      int clearCount = db.delete("mytable", null, null);
      Log.d(LOG_TAG, "deleted rows count = " + clearCount);
      break;
    }
    dbHelper.close();
  }

 class DBHelper extends SQLiteOpenHelper {

        public DBHelper(Context context) {

          super(context, "mytable", null, 1);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
          Log.d(LOG_TAG, "--- onCreate database ---");
          // создаем таблицу с полями
          db.execSQL("create table mytable ("
              + "id integer primary key autoincrement," 
              + "glucose text,"
              + "time text" + "date text" + ");");
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        }
      }

}
4

4 回答 4

6

错误只是说，该表mytable不包含请求的列date。除此之外没有魔法。

您应该再次删除并创建表，并确保它具有正确的列。请注意，您的onCreate方法包含错误。之后,缺少A。time text所以基本上你的数据库表甚至没有用这种方法创建，因为 SQL 是无效的。

尝试onCreate()使用以下代码创建表：

      db.execSQL("create table mytable ("
          + "id integer primary key autoincrement," 
          + "glucose text,"
          + "time text," // added a ','
          + "date text" + ");");
于 2013-03-05T17:54:44.487 回答
0

只有添加 a,才能解决问题create tablesql 无法创建表，因此它使用的是以前版本的表

于 2014-05-12T23:39:29.817 回答
0

当我 100% 确定我的表包含该列时，我遇到了这个错误。经过数小时的尝试后，我检查了表，发现它仍然有我在更改代码和这些列名时更改的旧列名与我的代码中的列名不匹配。我卸载了设备上的应用程序并重新安装，问题得到解决。

于 2014-12-28T21:37:10.403 回答
0

检查您的列是否与拼写匹配并插入到查询中。还要检查您的查询冒号和逗号 (,) 和 (") 是否正确插入。

于 2017-02-07T06:42:40.517 回答