基于字符串名称的sqlite数据库查询

Question

我在我的应用程序中创建了 sqlite 数据库并尝试保存突出显示的文本，保存工作正常，甚至检索所有突出显示也工作正常，但是当我根据书名查询突出显示时出现错误。

这是我到目前为止尝试过的 - 这是我的 oncreate sqlite 数据库：

@Override
public void onCreate(SQLiteDatabase db) {

    String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_HIGHLIGHTS + "("  
            + KEY_ID + " INTEGER PRIMARY KEY," +KEY_BOOKNAME +" TEXT," + KEY_HIGHLIGHT+" TEXT,"   + KEY_TEXTSIZE + " INTEGER,"  
            + KEY_PAGENO + " INTEGER" + ")";  
    db.execSQL(CREATE_CONTACTS_TABLE);  
}

这工作正常

  public List<HighlightSave> getAllHighlights() {

    List<HighlightSave> saveAllHighlights=new ArrayList<HighlightSave>();

    String selectQuery="SELECT * FROM "+TABLE_HIGHLIGHTS;

    SQLiteDatabase db=this.getWritableDatabase();

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

    if(cursor.moveToFirst()) { 
        do {
            HighlightSave hs=new HighlightSave();
            hs.setBookName(cursor.getString(1));
            hs.setHighlightedText(cursor.getString(2));

            hs.setTextSize(Integer.parseInt(cursor.getString(3)));
            hs.setPageno(Integer.parseInt(cursor.getString(4)));

            saveAllHighlights.add(hs);
        } while(cursor.moveToNext());
    }

    cursor.close();
    db.close();

    return saveAllHighlights;
}

问题是当我尝试使用如下的书名进行查询时

 public List<HighlightSave> getBookHighlights(String bookname) {

    SQLiteDatabase db= this.getReadableDatabase();

    List<HighlightSave> AllHighlightsOfBook= new ArrayList<HighlightSave>();

       Cursor cursor = db.query(TABLE_HIGHLIGHTS, new String[] {KEY_BOOKNAME,KEY_HIGHLIGHT,KEY_TEXTSIZE,KEY_PAGENO}, KEY_BOOKNAME + "=?", new String[] { bookname }, null, null, null, null);

    if(cursor.moveToFirst()){

        do{
            HighlightSave hs=new HighlightSave();
            hs.setBookName(cursor.getString(1));
            hs.setHighlightedText(cursor.getString(2));

            hs.setTextSize(Integer.parseInt(cursor.getString(3)));
            hs.setPageno(Integer.parseInt(cursor.getString(4)));

            AllHighlightsOfBook.add(hs);
        } while(cursor.moveToNext());
    }

    cursor.close();
    db.close();

    return AllHighlightsOfBook; 
}

我收到这个错误

12-05 11:03:48.025: E/AndroidRuntime(8811): FATAL EXCEPTION: main
12-05 11:03:48.025: E/AndroidRuntime(8811): Process: com.wowio.ebookreader, PID: 8811
12-05 11:03:48.025: E/AndroidRuntime(8811): java.lang.IllegalStateException: Couldn't read row 0, col 4 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.

12-05 11:03:48.025: E/AndroidRuntime(8811): at android.database.CursorWindow.nativeGetString(Native Method) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.database.CursorWindow.getString(CursorWindow.java:438) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51) 12-05 11:03:48.025: E/AndroidRuntime(8811): at com.eminosoft.epubreader.HighlightDatabase.getBookHighlights(HighlightDatabase.java:160) 12-05 11:03:48.025: E/AndroidRuntime(8811): at com.eminosoft.epubreader.HighlightFragment.onActivityCreated(HighlightFragment.java:66) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1508) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:958) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.support.v4.app.FragmentManagerImpl.run(FragmentManager.java:446) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.os.Handler.handleCallback(Handler.java:739) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.os.Handler.dispatchMessage(Handler.java:95) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.os.Looper.loop(Looper.java:148) 12-05 11:03:48.025: E/AndroidRuntime(8811): at android.app.ActivityThread.main(ActivityThread.java:5422) 12-05 11:03:48.025: E/AndroidRuntime(8811): at java.lang.reflect.Method.invoke(Native Method) 12-05 11:03:48.025: E/AndroidRuntime(8811): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 12-05 11:03:48.025: E/AndroidRuntime(8811): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

所以我认为光标有问题所以在 getBookHighlights() 中以这种方式初始化它

String query = "Select * from "+TABLE_HIGHLIGHTS+ " Where " +KEY_BOOKNAME + " = " + bookname ;
    Cursor cursor=  db.rawQuery(query,null);

然后我收到这个错误

12-05 11:20:06.514: E/AndroidRuntime(12305): FATAL EXCEPTION: main
12-05 11:20:06.514: E/AndroidRuntime(12305): Process: com.wowio.ebookreader, PID: 12305
12-05 11:20:06.514: E/AndroidRuntime(12305): android.database.sqlite.SQLiteException: near "Raven": syntax error (code 1): , while compiling: Select * from highlights Where book_Name = The Raven
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1255)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at com.eminosoft.epubreader.HighlightDatabase.getBookHighlights(HighlightDatabase.java:146)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at com.eminosoft.epubreader.HighlightFragment.onActivityCreated(HighlightFragment.java:66)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1508)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:958)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.support.v4.app.FragmentManagerImpl.run(FragmentManager.java:446)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.os.Handler.handleCallback(Handler.java:739)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.os.Handler.dispatchMessage(Handler.java:95)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.os.Looper.loop(Looper.java:148)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at android.app.ActivityThread.main(ActivityThread.java:5422)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at java.lang.reflect.Method.invoke(Native Method)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
12-05 11:20:06.514: E/AndroidRuntime(12305):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我做错了什么？（我在每次运行之前卸载了应用程序，所以以前的数据库不会有任何问题）

Answer 1

首先纠正您的SELECT查询

 String query = "SELECT * FROM " + TABLE_HIGHLIGHTS+ " WHERE " + KEY_BOOKNAME + " = '" + bookname + "'";

然后卸载旧应用程序并运行再次。

Answer 2

    String query="select * from "+TABLE_HIGHLIGHTS+" where "+KEY_BOOKNAME+"='"+bookname+"'";

Answer 3

有关获取列值的错误。

列索引从 Sqlite 游标中的零开始。

java.lang.IllegalStateException: Couldn't read row 0, col 4 from CursorWindow.

所以上一行的意思是4列在游标对象中不可用

你用0到3试试，我觉得应该可以解决。

基于字符串名称的sqlite数据库查询

Sqlite database query based on a string name

android

android-sqlite

sqliteopenhelper