在我的应用程序中，我将保存数据保存到表簿，它将book_id和Intent返回给ThemesActivity.class。如果用户选择ThemeGridview中的主题（ThemesActivity中的布局）。我想检查它bofore将它们保存在Table Theme.now my解决方案是通过book_id来获取表主题中的数据主题。如果它返回null。我想sava一个单击Table Theme的ThemeName，但它是返回数据（id为book_id的数据行），我想检查点击的ThemeName Table Theme中的和themeName如果相等则不执行任何操作。但不等于我想要在新的themeName中更新列filepath中的数据。
这是我在BookDB中的代码（关于insert，getAll，getByID，Delete等的类操作）
public Object getthemeByID(int id){
//สร้าง array เพื่อรับค่าจากชุดกลุ่มใข้อมูลจาก cursor
Object imagepath = new ArrayList<ThemeEntry>();
// selectionArgs คือ เงื่อนไข
int bookID = id;
Cursor cursor = db.rawQuery("SELECT filepath FROM " + BooksDBHelper.TABLE_THEME + " WHERE bokID = ? ", new String[]{Integer.toString(bookID)});
cursor.moveToFirst();
if(cursor.getCount()!=0){
ThemeEntry theme = new ThemeEntry();
theme.setFilepath(cursor.getString(cursor.getColumnIndex(BooksDBHelper.KEY_fILEPATH)));
imagepath = theme;
}
return (imagepath);
}
这是我的活动
public class ChThemesActivity extends Activity{
private GridView myGrid;
private Context context;
private GridViewAdapter adapter;
private BooksDB db;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_themes);
context = this;
myGrid = (GridView) findViewById(R.id.gridView1);
myGrid.setAdapter(new GridViewAdapter(context));
//event
myGrid.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
adapter = new GridViewAdapter(context);
db = new BooksDB(context);
//get bokID
Intent intent = getIntent();
int bokID = intent.getIntExtra("id", 0);
//get image name
String imageName = getResources().getResourceEntryName(adapter.thumbimage[position]);
//save data to Theme table
//pass bokID to check value
Object imagepath = db.getthemeByID(bokID);
if(imagepath != null){
String value = imagepath.toString();
Toast.makeText(getApplicationContext(), "is"+value, Toast.LENGTH_SHORT).show();
}
Toast.makeText(getApplicationContext(), "book name"+imageName+","+"bokID is"+bokID+", Toast.LENGTH_SHORT).show();
}
});
}
这是BookDBHelper中的表主题
public static String THEME_CREATE_SQL = "CREATE TABLE IF NOT EXISTS " + TABLE_THEME + "(" +
""+KEY_ID+" INTEGER PRIMARY KEY AUTOINCREMENT," +
""+KEY_fILEPATH+" VACHAR(255)," +
""+KEY_BOK_ID+" INTEGER(11)," +
" FOREIGN KEY ("+KEY_BOK_ID+") REFERENCES "+TABLE_BOOK+" ("+KEY_ID+"));";
这是一个logcat错误
12-07 03:30:13.262: E/SQLiteLog(1513): (1) no such column: filepath
12-07 03:30:13.272: D/AndroidRuntime(1513): Shutting down VM
12-07 03:30:13.272: W/dalvikvm(1513): threadid=1: thread exiting with uncaught exception (group=0x41465700)
12-07 03:30:13.325: E/AndroidRuntime(1513): FATAL EXCEPTION: main
12-07 03:30:13.325: E/AndroidRuntime(1513): android.database.sqlite.SQLiteException: no such column: filepath (code 1): , while compiling: SELECT filepath FROMthemes WHERE bokID = ?
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1253)
12-07 03:30:13.325: E/AndroidRuntime(1513): at com.example.mutitablesql.db.BooksDB.getthemeByID(BooksDB.java:84)
12-07 03:30:13.325: E/AndroidRuntime(1513): at com.example.mutitablesql.ChThemesActivity$1.onItemClick(ChThemesActivity.java:49)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2788)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.widget.AbsListView$1.run(AbsListView.java:3463)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.os.Handler.handleCallback(Handler.java:730)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.os.Handler.dispatchMessage(Handler.java:92)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.os.Looper.loop(Looper.java:137)
12-07 03:30:13.325: E/AndroidRuntime(1513): at android.app.ActivityThread.main(ActivityThread.java:5103)
12-07 03:30:13.325: E/AndroidRuntime(1513): at java.lang.reflect.Method.invokeNative(Native Method)
12-07 03:30:13.325: E/AndroidRuntime(1513): at java.lang.reflect.Method.invoke(Method.java:525)
12-07 03:30:13.325: E/AndroidRuntime(1513): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
12-07 03:30:13.325: E/AndroidRuntime(1513): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-07 03:30:13.325: E/AndroidRuntime(1513): at dalvik.system.NativeStart.main(Native Method)
请帮忙，谢谢
答案 0 :(得分：0)
正确检查KEY_fILEPATH，异常清楚地表明列文件路径不存在。
答案 1 :(得分：0)
compiling: SELECT filepath FROMthemes WHERE bokID = ?
请注意这里。所以FROMthemes应该是FROM themes，就像这样，
选择查询：
Cursor cursor = db.rawQuery("SELECT filepath FROM" + BooksDBHelper.TABLE_THEME + " WHERE bokID = ? ", new String[]{Integer.toString(bookID)});
这应该是
Cursor cursor = db.rawQuery("SELECT filepath FROM " + BooksDBHelper.TABLE_THEME + " WHERE bokID = ? ", new String[]{Integer.toString(bookID)});
此处添加了空格 FROM“。
像这样。让我知道会发生什么。