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我有一个带有两个表的 SQLite 数据库，一个用于保存登录信息，例如电子邮件地址和密码，另一个用于保存用户的 GPS 坐标。我在 DBadapter 类“DatabaseHandler.class”的 OnCreate 方法中创建了两个表。登录表工作正常，但坐标表不能。当我尝试访问并在其上运行命令时，程序会抛出“不存在这样的表”。

日志猫 

01-22 12:42:06.769: E/AndroidRuntime(854): FATAL EXCEPTION: main
01-22 12:42:06.769: E/AndroidRuntime(854): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.androidbasic12/com.example.androidbasic12.map}: android.database.sqlite.SQLiteException: no such table: coord (code 1): , while compiling: SELECT * FROM coord WHERE name = name
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.os.Handler.dispatchMessage(Handler.java:99)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.os.Looper.loop(Looper.java:137)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.ActivityThread.main(ActivityThread.java:5039)
01-22 12:42:06.769: E/AndroidRuntime(854):  at java.lang.reflect.Method.invokeNative(Native Method)
01-22 12:42:06.769: E/AndroidRuntime(854):  at java.lang.reflect.Method.invoke(Method.java:511)
01-22 12:42:06.769: E/AndroidRuntime(854):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-22 12:42:06.769: E/AndroidRuntime(854):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-22 12:42:06.769: E/AndroidRuntime(854):  at dalvik.system.NativeStart.main(Native Method)
01-22 12:42:06.769: E/AndroidRuntime(854): Caused by: android.database.sqlite.SQLiteException: no such table: coord (code 1): , while compiling: SELECT * FROM coord WHERE name = name
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1253)
01-22 12:42:06.769: E/AndroidRuntime(854):  at com.example.androidbasic12.library.DatabaseHandler.getLatLng(DatabaseHandler.java:155)
01-22 12:42:06.769: E/AndroidRuntime(854):  at com.example.androidbasic12.library.UserFunctions.getCoords(UserFunctions.java:124)
01-22 12:42:06.769: E/AndroidRuntime(854):  at com.example.androidbasic12.map.onCreate(map.java:56)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.Activity.performCreate(Activity.java:5104)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
01-22 12:42:06.769: E/AndroidRuntime(854):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
01-22 12:42:06.769: E/AndroidRuntime(854):  ... 11 more

DatabaseHandler.class

public class DatabaseHandler extends SQLiteOpenHelper {

// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;

// Database Name
private static final String DATABASE_NAME = "android_api";

//Carcoord table name
private static final String TABLE_CARCOORD = "coord";
// carcoord table columns names
private static final String CAR_KEY_ID = "id";
private static final String CAR_KEY_NAME = "name";
private static final String CAR_KEY_LAT = "lat";
private static final String CAR_KEY_LNG = "lng";


// Login table name
private static final String TABLE_LOGIN = "login";
// Login Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_EMAIL = "email";
private static final String KEY_UID = "uid";
private static final String KEY_CREATED_AT = "created_at";

//Strings that handles create table querys
private static final String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_LOGIN + "("
        + KEY_ID + " INTEGER PRIMARY KEY," 
        + KEY_NAME + " TEXT,"
        + KEY_EMAIL + " TEXT UNIQUE,"
        + KEY_UID + " TEXT,"
        + KEY_CREATED_AT + " TEXT" + ")";
private static final String CREATE_CARCOORD_TABLE = "CREATE TABLE " + TABLE_CARCOORD + "("
        + CAR_KEY_ID + " INTEGER PRIMARY KEY,"
        + CAR_KEY_NAME + " TEXT,"
        + CAR_KEY_LAT + " TEXT,"
        + CAR_KEY_LNG + " TEXT" + ")";

//Constructor
public DatabaseHandler(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL(CREATE_LOGIN_TABLE);
    db.execSQL(CREATE_CARCOORD_TABLE);

}

// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // Drop older table if existed
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_CARCOORD);

    // Create tables again
    onCreate(db);
}

/**
 * Store coordinates in TABLEE_COORDS
 */
public void addCoord(String name, String lat, String lng){
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(KEY_NAME, name); // Name
    values.put(CAR_KEY_LAT, lat); // latitude
    values.put(CAR_KEY_LNG, lng); //Longitude

    // Inserting row
    db.insert(TABLE_CARCOORD, null, values);
    db.close(); // Closing writable database connection
}

/**
 * Storing user details in database
 * */
public void addUser(String name, String email, String uid, String created_at) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_NAME, name); // Name
    values.put(KEY_EMAIL, email); // Email
    values.put(KEY_UID, uid); // Email
    values.put(KEY_CREATED_AT, created_at); // Created At

    // Inserting Row
    db.insert(TABLE_LOGIN, null, values);
    db.close(); // Closing database connection
}

/**
 * Getting user data from database
 * */
public HashMap<String, String> getUserDetails(){
    HashMap<String,String> user = new HashMap<String,String>();
    String selectQuery = "SELECT  * FROM " + TABLE_LOGIN;

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);
    // Move to first row
    cursor.moveToFirst();
    if(cursor.getCount() > 0){
        user.put("name", cursor.getString(1));
        user.put("email", cursor.getString(2));
        user.put("uid", cursor.getString(3));
        user.put("created_at", cursor.getString(4));
    }
    cursor.close();
    db.close();
    // return user
    return user;
}


/**
 * Getting user login status
 * return true if rows are there in table
 * */
public int getRowCount() {
    String countQuery = "SELECT  * FROM " + TABLE_LOGIN;
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(countQuery, null);
    int rowCount = cursor.getCount();
    db.close();
    cursor.close();
    // return row count
    return rowCount;
    }
public Cursor getUsername(){
    SQLiteDatabase db = this.getReadableDatabase();
    String query = ("SELECT * FROM " + TABLE_LOGIN + " WHERE name = " + KEY_NAME);
    Cursor cursor = db.rawQuery(query, null);
    return cursor;
}

public Cursor getLatLng(){
    SQLiteDatabase db = this.getReadableDatabase();
    String query = ("SELECT * FROM " + TABLE_CARCOORD + " WHERE name = " + CAR_KEY_NAME);
    Cursor cursor = db.rawQuery(query, null);
    return cursor;

}


/**
 * reset table TABLE_CARCOORD
 */
public void resetCarcoord(){
    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(TABLE_CARCOORD, null, null);
    db.close();
}
/**
 * Re create database
 * Delete all tables and create them again
 * */
public void resetTables(){
    SQLiteDatabase db = this.getWritableDatabase();
    // Delete All Rows
    db.delete(TABLE_LOGIN, null, null);
    db.close();
}

}

来自 UserFunctions.class 的代码片段，我在其中使用表“coord”。

    /**
 * Get lat and lng from TABLE_CARCOORDS
 */
public ArrayList<String> getCoords(Context context, String lat, String lng) {
    DatabaseHandler db = new DatabaseHandler(context);
    Cursor cursor = db.getLatLng();
    ArrayList<String> cordarr = new ArrayList<String>();
    if (cursor.moveToFirst()){
        lat = cursor.getString(cursor.getColumnIndex("lat"));
        lng = cursor.getString(cursor.getColumnIndex("lng"));
        cordarr.add(lat);
        cordarr.add(lng);
    }
cursor.close();
db.close();
return cordarr;
}

修复后的 LogCats

第一个问题

01-22 14:15:07.080: E/SQLiteDatabase(20980): close() was never explicitly called on database '/data/data/com.example.androidbasic12/databases/android_api' 
01-22 14:15:07.080: E/SQLiteDatabase(20980): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:2072)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1126)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1083)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1170)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:844)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:228)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:231)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at com.example.androidbasic12.library.DatabaseHandler.getUsername(DatabaseHandler.java:146)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at com.example.androidbasic12.library.UserFunctions.getUname(UserFunctions.java:87)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at com.example.androidbasic12.DashboardActivity.onCreate(DashboardActivity.java:59)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.Activity.performCreate(Activity.java:4470)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.os.Looper.loop(Looper.java:137)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at android.app.ActivityThread.main(ActivityThread.java:4511)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at java.lang.reflect.Method.invokeNative(Native Method)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at java.lang.reflect.Method.invoke(Method.java:511)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
01-22 14:15:07.080: E/SQLiteDatabase(20980):    at dalvik.system.NativeStart.main(Native Method)
01-22 14:15:07.080: E/System(20980): Uncaught exception thrown by finalizer
01-22 14:15:07.085: E/System(20980): java.lang.IllegalStateException: Don't have database lock!
01-22 14:15:07.085: E/System(20980):    at android.database.sqlite.SQLiteDatabase.verifyLockOwner(SQLiteDatabase.java:2230)
01-22 14:15:07.085: E/System(20980):    at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2322)
01-22 14:15:07.085: E/System(20980):    at android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2318)
01-22 14:15:07.085: E/System(20980):    at android.util.LruCache.trimToSize(LruCache.java:197)
01-22 14:15:07.085: E/System(20980):    at android.util.LruCache.evictAll(LruCache.java:285)
01-22 14:15:07.085: E/System(20980):    at android.database.sqlite.SQLiteDatabase.deallocCachedSqlStatements(SQLiteDatabase.java:2283)
01-22 14:15:07.085: E/System(20980):    at android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:1255)
01-22 14:15:07.085: E/System(20980):    at android.database.sqlite.SQLiteDatabase.finalize(SQLiteDatabase.java:2043)
01-22 14:15:07.085: E/System(20980):    at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:185)
01-22 14:15:07.085: E/System(20980):    at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
01-22 14:15:07.085: E/System(20980):    at java.lang.Thread.run(Thread.java:856)

第二个错误

01-22 14:15:07.435: E/AndroidRuntime(20980): FATAL EXCEPTION: main
01-22 14:15:07.435: E/AndroidRuntime(20980): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.androidbasic12/com.example.androidbasic12.map}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.os.Looper.loop(Looper.java:137)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.ActivityThread.main(ActivityThread.java:4511)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at java.lang.reflect.Method.invokeNative(Native Method)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at java.lang.reflect.Method.invoke(Method.java:511)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at dalvik.system.NativeStart.main(Native Method)
01-22 14:15:07.435: E/AndroidRuntime(20980): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
01-22 14:15:07.435: E/AndroidRuntime(20980):    at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at java.util.ArrayList.get(ArrayList.java:304)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at com.example.androidbasic12.map.onCreate(map.java:57)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.Activity.performCreate(Activity.java:4470)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
01-22 14:15:07.435: E/AndroidRuntime(20980):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
01-22 14:15:07.435: E/AndroidRuntime(20980):    ... 11 more
4

1 回答 1

2

您是否在仅开始时添加了以下语句 db.execSQL(CREATE_CARCOORD_TABLE);（我的意思是两个表一起），或者您稍后在创建数据库后添加它。

我会建议您从手机/模拟器中完全删除/卸载该应用程序。并再次安装它，看看它在 execSQL 方法调用上说了什么。我认为如果您是上述情况，它可能应该有效。

这里的原因是在未创建数据库时调用一次 onCreate，因此如果在创建数据库时调用一次，稍后如果您添加另一个表，则不会调用 onCreate，因此不会创建添加的表。所以这里的解决方案是完全删除应用程序并再次安装它，所以 onCreate 现在会调用。或者增加我们的数据库版本并做一些处理。

于 2013-01-22T12:59:49.453 回答