Question

我继续收到此错误，说我的数据库中的表不存在，但表已声明。

所以，我有这个类在数据库中创建约会，即：

package com.example.calendar;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CalendarView;
import android.widget.EditText;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.example.calendar.Appointment;
import static com.example.calendar.Constants.KEY_DATE;
import static com.example.calendar.Constants.KEY_DETAILS;
import static com.example.calendar.Constants.KEY_ID;
import static com.example.calendar.Constants.KEY_TIME;
import static com.example.calendar.Constants.KEY_TITLE;
import static com.example.calendar.Constants.TABLE_APP;


public class CreateAppointment extends Activity implements OnClickListener{

    EditText titleTextBox, timeTextBox, detailsTextBox;
    int[] dateSelected = new int[3];

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.create);

        titleTextBox = (EditText) findViewById(R.id.apptTitle);
        timeTextBox = (EditText) findViewById(R.id.apptTime);
        detailsTextBox = (EditText) findViewById(R.id.apptDetails);

        View createButton = (Button) findViewById(R.id.apptSave);
        String dateToPass = null;
        Bundle getExtraFromMain = getIntent().getExtras();
        if(getExtraFromMain != null){
            dateSelected = getExtraFromMain.getIntArray(dateToPass);
        }

        createButton.setOnClickListener(this);

    }



    private Cursor cursor(){
        DBHandler appointment = new DBHandler(this);
        SQLiteDatabase db = appointment.getReadableDatabase();
        String[] getValueFrom = {KEY_DATE, KEY_TITLE, KEY_TIME, KEY_DETAILS};
        Cursor cursor = db.query(TABLE_APP, getValueFrom, null, null, null, null, KEY_DATE + " ASC");
        return cursor;
    }

    private void save(){
        String getTime = timeTextBox.getText().toString();
        String getTitle = titleTextBox.getText().toString();
        String getDetails = detailsTextBox.getText().toString();
        DBHandler appointment = new DBHandler(this);
        SQLiteDatabase db = appointment.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(KEY_TITLE, getTitle);
        values.put(KEY_TIME, getTime);
        values.put(KEY_DETAILS, getDetails);
        values.put(KEY_DATE, dateSelected[0] + "/" + dateSelected[1] + "/" + dateSelected[2]);
        db.insertOrThrow(TABLE_APP, null, values);
        appointment.close();
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch(v.getId()){

        case R.id.apptSave:
            save();
            finish();
            break;

        }

    }

}

当然，我的经纪人：

package com.example.calendar;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import static com.example.calendar.Constants.KEY_DATE;
import static com.example.calendar.Constants.KEY_DETAILS;
import static com.example.calendar.Constants.KEY_ID;
import static com.example.calendar.Constants.KEY_TIME;
import static com.example.calendar.Constants.KEY_TITLE;
import static com.example.calendar.Constants.TABLE_APP;

public class DBHandler extends SQLiteOpenHelper {

    //Variables needed
    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "appts.db";// database name

    public DBHandler(Context context){
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override//create table
    public void onCreate(SQLiteDatabase db){
        String CREATE_APPOINTMENTS_TABLE = "CREATE TABLE " + TABLE_APP + " ("
                + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_DATE + " TEXT NOT NULL,"
                + KEY_TITLE + " TEXT NOT NULL, " + KEY_TIME + " TEXT NOT NULL, " + KEY_DETAILS + " TEXT NOT NULL" + ");";
        db.execSQL(CREATE_APPOINTMENTS_TABLE);
    }

    @Override//when upgraded, trigger
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_APP);//delete table from older version
        onCreate(db);//create new table
    }


}

此外，声明表名的接口：

package com.example.calendar;

import android.provider.BaseColumns;

public interface Constants extends BaseColumns{

    public static final String TABLE_APP = "appointments";// table name
    public static final String KEY_ID = "id";
    public static final String KEY_DATE = "date";
    public static final String KEY_TITLE = "title";
    public static final String KEY_TIME = "time";
    public static final String KEY_DETAILS = "details";

}

当我点击Activity上的按钮时，Logcat给了我这个：

03-24 02:18:28.134: E/AndroidRuntime(800): android.database.sqlite.SQLiteException: no such table: appointments: , while compiling: INSERT INTO appointments(time,title,date,details) VALUES (?,?,?,?)
03-24 02:18:28.134: E/AndroidRuntime(800):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
03-24 02:18:28.134: E/AndroidRuntime(800):  at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
03-24 02:18:28.134: E/AndroidRuntime(800):  at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:112)
03-24 02:18:28.134: E/AndroidRuntime(800):  at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1718)
03-24 02:18:28.134: E/AndroidRuntime(800):  at android.database.sqlite.SQLiteDatabase.insertOrThrow(SQLiteDatabase.java:1617)
03-24 02:18:28.134: E/AndroidRuntime(800):  at com.example.calendar.CreateAppointment.save(CreateAppointment.java:69)
03-24 02:18:28.134: E/AndroidRuntime(800):  at com.example.calendar.CreateAppointment.onClick(CreateAppointment.java:80)

注意：第69和80行是：

69：

db.insertOrThrow(TABLE_APP, null, values);

80：

save();//from switch statement

有人可以帮助我吗？

Answer 1

您的代码看起来很好，因此将DATABASE_VERSION = 1更改为DATABASE_VERSION = 2可能会有所帮助。

原因是onCreate()和onUpgrade()只运行一次！因此，如果您在调用它们之后对其进行了任何更改，则更改将不会生效。因此，更改数据库的版本或清除设备/模拟器中的应用程序数据可能会触发再次运行onCreate()和onUpgrade()。

因此，每当您更改onCreate()和onUpgrade()内的任何内容时，都会增加数据库版本。

Sqlite android：找不到表

1 个答案: