SQLiteException:即使有表没有这样的表 [英] SQLiteException: No such table even if there is table

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问题描述

当试图从SQLite的读取值20dB此错误传来: -

 二月七日至15日:49:33.040:E / SQLiteLog(1770):(1)没有这样的表:collegelist
2月7日至15日:49:33.040:D / AndroidRuntime(1770):关闭VM
2月7日至15日:49:33.050:W / dalvikvm(1770):主题ID = 1:螺纹未捕获的异常(组= 0xb2acaba8)退出
2月7日至15日:49:33.050:E / AndroidRuntime(1770):致命异常:主要
2月7日至15日:49:33.050:E / AndroidRuntime(1770):工艺:com.existingsqlitedatabase,PID:1770
2月7日至15日:49:33.050:E / AndroidRuntime(1770):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.existingsqlitedatabase / com.existingsqlitedatabase.MainActivity}:android.database.sqlite.SQLiteException:没有这样的表:collegelist(code 1),在编译:SELECT * FROM collegelist
2月7日至15日:49:33.050:E / AndroidRuntime(1770):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
2月7日至15日:49:33.050:E / AndroidRuntime(1770):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
2月7日至15日:49:33.050:E / AndroidRuntime(1770):在android.app.ActivityThread.access $ 800(ActivityThread.java:135)
2月7日至15日:49:33.050:E / AndroidRuntime(1770):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1196)
2月7日至15日:49:33.050:E / AndroidRuntime(1770):在android.os.Handler.dispatchMessage(Handler.java:102)

我在我的数据库(学院)检查表(collegelist),它是有,但我不知道为什么它不读它。我也曾在这里检查一些与此相关的帖子较早,但他们并没有帮助。

这是我的DatabaseHelper类: -

 公共类DataBaseHelper扩展SQLiteOpenHelper
{
私有静态字符串标记=DataBaseHelper; //标签只是为了LogCat中窗口
//我们的目标设备上的数据库路径(位置)
私人静态字符串DB_PATH =;
私人静态字符串DB_NAME =学院; //数据库名称
私人SQLiteDatabase mDataBase;
私人最终上下文mContext;公共DataBaseHelper(上下文的背景下)
{
超(背景下,DB_NAME,NULL,1); // 1?它的数据库版本
DB_PATH = context.getApplicationInfo()DATADIR +/数据库/。
this.mContext =背景;
}公共无效的CreateDatabase()抛出IOException异常
{
//如果数据库不存在从资产复制布尔mDataBaseExist = checkDataBase();
如果(!mDataBaseExist)
{
    this.getReadableDatabase();
    this.close();
    尝试
    {
        //复制从资产产生数据库
        copyDataBase();
        Log.e(TAG的CreateDatabase数据库中创建);
    }
    赶上(IOException异常mIOException)
    {
        抛出新的错误(ErrorCopyingDataBase);
    }
  }
}
//检查数据库存在这里:/数据/数据​​/软件包/数据库/ DA名称
私人布尔checkDataBase()
{
    文件DBFILE =新的文件(DB_PATH + DB_NAME);
    //Log.v(\"dbFile,DBFILE ++ dbFile.exists());
    返回dbFile.exists();
}//复制从资产数据库
私人无效copyDataBase()抛出IOException异常
{
    InputStream的mInput = mContext.getAssets()开(DB_NAME)。
    字符串outFileName = DB_PATH + DB_NAME;
    的OutputStream mOutput =新的FileOutputStream(outFileName);
    字节[] = mBuffer新的字节[1024];
    INT mLength;
    而((mLength = mInput.read(mBuffer))大于0)
    {
        mOutput.write(mBuffer,0,mLength);
    }
    mOutput.flush();
    mOutput.close();
    mInput.close();
}//打开数据库,所以我们可以查询它
公共布尔的openDatabase()抛出的SQLException
{
    字符串的mpath = DB_PATH + DB_NAME;
    //Log.v(\"mPath的mpath);
    mDataBase = SQLiteDatabase.openDatabase(的mpath,空,SQLiteDatabase.CREATE_IF_NECESSARY);
    // mDataBase = SQLiteDatabase.openDatabase(的mpath,空,SQLiteDatabase.NO_LOCALIZED_COLLATORS);
    返回mDataBase!= NULL;
}@覆盖
公共同步无效的close()
{
    如果(mDataBase!= NULL)
        mDataBase.close();
    super.close();
}@覆盖
公共无效的onCreate(SQLiteDatabase为arg0){
    // TODO自动生成方法存根}@覆盖
公共无效onUpgrade(SQLiteDatabase分贝,INT oldVersion,诠释静态网页){
    // TODO自动生成方法存根} / **
 *让所有标签
 *返回标签列表
 * * /
公开名单<串GT; getAllLabels(){
    清单<串GT;标签=新的ArrayList<串GT;();    //选择所有查询
    字符串selectQuery =SELECT * FROM collegelist    SQLiteDatabase分贝= this.getReadableDatabase();
    光标光标= db.rawQuery(selectQuery,NULL);    //通过所有行循环,并增加列表
    如果(cursor.moveToFirst()){
        做{
            labels.add(cursor.getString(1));
        }而(cursor.moveToNext());
    }    //关闭连接
    cursor.close();
    db.close();    //返回标贴
    返回标签;
   }
}

请帮忙。


解决方案

  

从资源文件夹加载databaese


 公共类DataHelper扩展SQLiteOpenHelper {公共SQLiteDatabase数据库= NULL;
公共文件databaseFile;
公共静态字符串的databaseName =MYDB;
公共字符串databasePath =;
上下文mContext;公共DataHelper(上下文paramContext){    超(paramContext,的databaseName,空,1);
    this.mContext = paramContext;
    this.databasePath =(数据/数据​​/+ paramContext.getPackageName()+/数据库/+的databaseName);
    //this.databasePath =(数据/数据​​/+ paramContext.getPackageName()+/data.sqlite);
    this.databaseFile =新的文件(this.databasePath);
    如果(!this.databaseFile.exists())
        尝试{
            deployDataBase(DataHelper.databaseName,this.databasePath);
            返回;
        }赶上(IOException异常localIOException){
            localIOException.printStackTrace();
        }
}私人无效deployDataBase(DBNAME字符串,字符串DBPATH)
        抛出IOException
    InputStream的localInputStream = this.mContext.getAssets()开(数据库)。
    FileOutputStream中localFileOutputStream =新的FileOutputStream(DBPATH);
    字节[] = arrayOfByte新的字节[1024];
    而(真){
        INT I = localInputStream.read(arrayOfByte);
        如果(ⅰ&下; = 0){
            localFileOutputStream.flush();
            localFileOutputStream.close();
            localInputStream.close();
            返回;
        }
        localFileOutputStream.write(arrayOfByte,0,I);
    }
}@覆盖
公共同步无效的close(){    如果(数据库!= NULL)
        database.close();    super.close();}
@覆盖
公共无效的onCreate(SQLiteDatabase DB){
    // TODO自动生成方法存根}@覆盖
公共无效onUpgrade(SQLiteDatabase分贝,INT oldVersion,诠释静态网页){
    // TODO自动生成方法存根}}

While trying to fetch the values from SQLite db this error came:-

07-15 02:49:33.040: E/SQLiteLog(1770): (1) no such table: collegelist
07-15 02:49:33.040: D/AndroidRuntime(1770): Shutting down VM
07-15 02:49:33.050: W/dalvikvm(1770): threadid=1: thread exiting with uncaught exception (group=0xb2acaba8)
07-15 02:49:33.050: E/AndroidRuntime(1770): FATAL EXCEPTION: main
07-15 02:49:33.050: E/AndroidRuntime(1770): Process: com.existingsqlitedatabase, PID: 1770
07-15 02:49:33.050: E/AndroidRuntime(1770): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.existingsqlitedatabase/com.existingsqlitedatabase.MainActivity}: android.database.sqlite.SQLiteException: no such table: collegelist (code 1): , while compiling: SELECT * FROM collegelist
07-15 02:49:33.050: E/AndroidRuntime(1770):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
07-15 02:49:33.050: E/AndroidRuntime(1770):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-15 02:49:33.050: E/AndroidRuntime(1770):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-15 02:49:33.050: E/AndroidRuntime(1770):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-15 02:49:33.050: E/AndroidRuntime(1770):     at android.os.Handler.dispatchMessage(Handler.java:102)

I have checked the table(collegelist) in my database(colleges) and it is there but I don't know why it's not reading it. I have also checked here few earlier posts related to it but they didn't helped.

This is my DatabaseHelper class:-

public class DataBaseHelper extends SQLiteOpenHelper 
{ 
private static String TAG = "DataBaseHelper"; // Tag just for the LogCat window 
//destination path (location) of our database on device 
private static String DB_PATH = "";  
private static String DB_NAME ="colleges";// Database name 
private SQLiteDatabase mDataBase;  
private final Context mContext; 

public DataBaseHelper(Context context)  
{ 
super(context, DB_NAME, null, 1);// 1? its Database Version 
DB_PATH = context.getApplicationInfo().dataDir + "/databases/"; 
this.mContext = context; 
}    

public void createDataBase() throws IOException 
{ 
//If database not exists copy it from the assets 

boolean mDataBaseExist = checkDataBase(); 
if(!mDataBaseExist) 
{ 
    this.getReadableDatabase(); 
    this.close(); 
    try  
    { 
        //Copy the database from assests 
        copyDataBase(); 
        Log.e(TAG, "createDatabase database created"); 
    }  
    catch (IOException mIOException)  
    { 
        throw new Error("ErrorCopyingDataBase"); 
    } 
  } 
} 
//Check that the database exists here: /data/data/your package/databases/Da Name 
private boolean checkDataBase() 
{ 
    File dbFile = new File(DB_PATH + DB_NAME); 
    //Log.v("dbFile", dbFile + "   "+ dbFile.exists()); 
    return dbFile.exists(); 
} 

//Copy the database from assets 
private void copyDataBase() throws IOException 
{ 
    InputStream mInput = mContext.getAssets().open(DB_NAME); 
    String outFileName = DB_PATH + DB_NAME; 
    OutputStream mOutput = new FileOutputStream(outFileName); 
    byte[] mBuffer = new byte[1024]; 
    int mLength; 
    while ((mLength = mInput.read(mBuffer))>0) 
    { 
        mOutput.write(mBuffer, 0, mLength); 
    } 
    mOutput.flush(); 
    mOutput.close(); 
    mInput.close(); 
} 

//Open the database, so we can query it 
public boolean openDataBase() throws SQLException 
{ 
    String mPath = DB_PATH + DB_NAME; 
    //Log.v("mPath", mPath); 
    mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.CREATE_IF_NECESSARY); 
    //mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS); 
    return mDataBase != null; 
} 

@Override 
public synchronized void close()  
{ 
    if(mDataBase != null) 
        mDataBase.close(); 
    super.close(); 
}

@Override
public void onCreate(SQLiteDatabase arg0) {
    // TODO Auto-generated method stub

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub

} 

 /**
 * Getting all labels
 * returns list of labels
 * */
public List<String> getAllLabels(){
    List<String> labels = new ArrayList<String>();

    // Select All Query
    String selectQuery = "SELECT * FROM collegelist";

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
        do {
            labels.add(cursor.getString(1));
        } while (cursor.moveToNext());
    }

    // closing connection
    cursor.close();
    db.close();

    // returning lables
    return labels;
   }
} 

Please help.

解决方案

Load databaese from asset folder

public class DataHelper extends SQLiteOpenHelper {

public SQLiteDatabase database = null;
public File databaseFile;
public static String databaseName = "myDb";
public String databasePath = "";
Context mContext;

public DataHelper(Context paramContext) {

    super(paramContext, databaseName, null, 1);
    this.mContext = paramContext;


    this.databasePath = ("data/data/" + paramContext.getPackageName()+"/databases/"+databaseName);
    //this.databasePath = ("data/data/" + paramContext.getPackageName() + "/data.sqlite");
    this.databaseFile = new File(this.databasePath);
    if (!this.databaseFile.exists())
        try {
            deployDataBase(DataHelper.databaseName, this.databasePath);
            return;
        } catch (IOException localIOException) {
            localIOException.printStackTrace();
        }
}

private void deployDataBase(String dbNAme, String dbPath)
        throws IOException {
    InputStream localInputStream = this.mContext.getAssets().open(dbNAme);
    FileOutputStream localFileOutputStream = new FileOutputStream(dbPath);
    byte[] arrayOfByte = new byte[1024];
    while (true) {
        int i = localInputStream.read(arrayOfByte);
        if (i <= 0) {
            localFileOutputStream.flush();
            localFileOutputStream.close();
            localInputStream.close();
            return;
        }
        localFileOutputStream.write(arrayOfByte, 0, i);
    }
}

@Override
public synchronized void close() {

    if (database != null)
        database.close();

    super.close();

}
@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub

}

}

这篇关于SQLiteException:即使有表没有这样的表的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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