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我的 SQLite 数据库似乎可以正常输入条目，但是我无法将它们拉回来查看它们，每次加载活动时，我的应用程序崩溃，更改数据库版本会引发 SQL 异常并强制关闭应用程序。

下面是处理 SQL 的类：

package com.uhi.fatfighter;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class Stats {

    public static final String KEY_ROWID = "_id";
    public static final String KEY_WEIGHT = "weight";
    public static final String KEY_WAIST = "waist";
    public static final String KEY_CHEST = "chest";
    public static final String KEY_LEGS = "legs";
    public static final String KEY_ARMS = "arms";

    private static final String DATABASE_NAME = "statsDB";
    private static final String DATABASE_TABLE = "personalStats";
    private static final int DATABASE_VERSION = 3;

    private DbHelper ffHelper;
    private final Context ffContext;
    private SQLiteDatabase ffDatabase;

    private static class DbHelper extends SQLiteOpenHelper {

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

        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
                    + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_WEIGHT
                    + " TEXT NOT NULL, " + KEY_WAIST + " TEXT NOT NULL, "
                    + KEY_CHEST + " TEXT NOT NULL, " + KEY_LEGS
                    + " TEXT NOT NULL, " + KEY_ARMS + " TEXT NOT NULL);");

        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXIST " + DATABASE_TABLE);
            onCreate(db);

        }
    }

    public Stats(Context c) {
        ffContext = c;
    }

    public Stats open() throws SQLException {
        ffHelper = new DbHelper(ffContext);
        ffDatabase = ffHelper.getWritableDatabase();
        return this;

    }

    public void close() {
        ffHelper.close();

    }

    public long createEntry(String weight, String waist, String chest, String legs, String arms) {
        ContentValues cv = new ContentValues();
        cv.put(KEY_WEIGHT, weight);
        cv.put(KEY_WAIST, waist);
        cv.put(KEY_CHEST, chest);
        cv.put(KEY_LEGS, legs);
        cv.put(KEY_ARMS, arms);
        return ffDatabase.insert(DATABASE_TABLE, null, cv);

    }

    public String getData() {
        String[] columns = new String[] { KEY_ROWID, KEY_WEIGHT, KEY_WAIST, KEY_CHEST, KEY_LEGS, KEY_ARMS };
        Cursor c = ffDatabase.query(DATABASE_TABLE, columns, null, null, null,
                null, null);
        String result = "";
        int iRow = c.getColumnIndex(KEY_ROWID);
        int iWeight = c.getColumnIndex(KEY_WEIGHT);
        int iWaist = c.getColumnIndex(KEY_WAIST);
        int iChest = c.getColumnIndex(KEY_CHEST);
        int iLegs = c.getColumnIndex(KEY_LEGS);
        int iArms = c.getColumnIndex(KEY_ARMS);
        for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
            result = result + c.getString(iRow) + " " + c.getString(iWeight)
                    + " " + c.getString(iWaist) 
                    + " " + c.getString(iChest) 
                    + " " + c.getString(iLegs) 
                    + " " + c.getString(iArms) + "\n";

        }

        return result;
    }
}

下面是调用SQL处理类的Activity：

package com.uhi.fatfighter;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.widget.TextView;


public class DBView extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.view_stats);
        TextView tv = (TextView) findViewById(R.id.tvDBInfo);
        Stats dbInfo = new Stats(this);
        dbInfo.open();

        String data = dbInfo.getData();
        dbInfo.close();
        if (!TextUtils.isEmpty(data)) {
            tv.setText(data);
        }


    }



}

正如我所说，在我添加一些额外的字段之前，这一切正常

日志猫：

05-09 13:44:32.761: E/Trace(7576): error opening trace file: No such file or directory (2)
05-09 13:44:32.894: E/InputDispatcher(1294): channel '415d5068 com.uhi.fatfighter/com.uhi.fatfighter.Splash (server)' ~ Channel is unrecoverably broken and will be disposed!
05-09 13:44:34.964: E/Trace(7593): error opening trace file: No such file or directory (2)
05-09 13:44:34.988: E/Trace(7598): error opening trace file: No such file or directory (2)
05-09 13:44:54.250: E/AndroidRuntime(7598): FATAL EXCEPTION: main
05-09 13:44:54.250: E/AndroidRuntime(7598): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.uhi.fatfighter/com.uhi.fatfighter.DBView}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.ActivityThread.access$600(ActivityThread.java:142)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.os.Looper.loop(Looper.java:137)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.ActivityThread.main(ActivityThread.java:4928)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at java.lang.reflect.Method.invokeNative(Native Method)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at java.lang.reflect.Method.invoke(Method.java:511)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at dalvik.system.NativeStart.main(Native Method)
05-09 13:44:54.250: E/AndroidRuntime(7598): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:747)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:256)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.Activity.setContentView(Activity.java:1867)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at com.uhi.fatfighter.DBView.onCreate(DBView.java:16)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.Activity.performCreate(Activity.java:5008)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
05-09 13:44:54.250: E/AndroidRuntime(7598):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2139)
05-09 13:44:54.250: E/AndroidRuntime(7598):     ... 11 more
05-09 13:44:56.765: E/Trace(7630): error opening trace file: No such file or directory (2)
05-09 13:45:10.125: E/Trace(7649): error opening trace file: No such file or directory (2)
05-09 13:45:10.433: E/Trace(7664): error opening trace file: No such file or directory (2)
05-09 13:45:11.183: E/Trace(7678): error opening trace file: No such file or directory (2)
05-09 13:45:12.203: E/Trace(7695): error opening trace file: No such file or directory (2)
05-09 13:45:14.187: E/AndroidRuntime(7630): FATAL EXCEPTION: main
05-09 13:45:14.187: E/AndroidRuntime(7630): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.uhi.fatfighter/com.uhi.fatfighter.DBView}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.ActivityThread.access$600(ActivityThread.java:142)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.os.Looper.loop(Looper.java:137)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.ActivityThread.main(ActivityThread.java:4928)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at java.lang.reflect.Method.invokeNative(Native Method)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at java.lang.reflect.Method.invoke(Method.java:511)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at dalvik.system.NativeStart.main(Native Method)
05-09 13:45:14.187: E/AndroidRuntime(7630): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:747)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:256)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.Activity.setContentView(Activity.java:1867)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at com.uhi.fatfighter.DBView.onCreate(DBView.java:16)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.Activity.performCreate(Activity.java:5008)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
05-09 13:45:14.187: E/AndroidRuntime(7630):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2139)
05-09 13:45:14.187: E/AndroidRuntime(7630):     ... 11 more
05-09 13:45:18.433: E/Trace(7722): error opening trace file: No such file or directory (2)
05-09 13:52:02.109: E/Trace(7767): error opening trace file: No such file or directory (2)
05-09 13:52:03.554: E/Trace(7781): error opening trace file: No such file or directory (2)
05-09 13:55:06.617: E/Trace(7807): error opening trace file: No such file or directory (2)
05-09 13:55:26.808: E/AndroidRuntime(7807): FATAL EXCEPTION: main
05-09 13:55:26.808: E/AndroidRuntime(7807): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.uhi.fatfighter/com.uhi.fatfighter.DBView}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.ActivityThread.access$600(ActivityThread.java:142)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.os.Looper.loop(Looper.java:137)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.ActivityThread.main(ActivityThread.java:4928)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at java.lang.reflect.Method.invokeNative(Native Method)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at java.lang.reflect.Method.invoke(Method.java:511)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at dalvik.system.NativeStart.main(Native Method)
05-09 13:55:26.808: E/AndroidRuntime(7807): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:747)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:256)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.Activity.setContentView(Activity.java:1867)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at com.uhi.fatfighter.DBView.onCreate(DBView.java:16)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.Activity.performCreate(Activity.java:5008)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
05-09 13:55:26.808: E/AndroidRuntime(7807):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2139)
05-09 13:55:26.808: E/AndroidRuntime(7807):     ... 11 more
05-09 13:58:40.242: E/Trace(7828): error opening trace file: No such file or directory (2)
05-09 13:58:40.500: E/Trace(7841): error opening trace file: No such file or directory (2)
05-09 13:58:40.937: E/PhotoDatabaseHelper(7828): query fail: empty cursor: android.database.sqlite.SQLiteCursor@415ae7e8
05-09 13:58:40.937: E/WidgetProvider(7828): cannot load widget: 5

我可以看到班级在转换 TextView 时遇到问题

4

3 回答 3

1 
DROP TABLE IF EXISTS

是正确的语法。

于 2013-05-09T12:39:41.623 回答
1

您的 drop 查询是错误的。EXIST 是一个错误的关键字。

它应该是 ：

db.execSQL("如果存在则删除表" + DATABASE_TABLE);

于 2013-05-09T12:37:39.700 回答
0

问题在于 SQLITE 视图的 XML 文件，我检查了我所有的 TextView 字段是否设置正确，但它们没有。这解决了这个问题。

于 2013-05-09T13:14:50.707 回答