在Android中的SQLite中获取行的ID [英] Getting id of a row in SQLite in android
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问题描述
在我的应用程序中,我想获取特定行的ID.我正在使用以下代码:
In my application I want to get the id of a particular row. I am using the following code:
public String getid(String heading) throws SQLException
{
System.out.println("ddbpos="+heading);
long recc=0;
String rec=null;
Cursor mCursor = db.rawQuery(
"SELECT id FROM savedstoriestable WHERE heading="+heading , null);
if (mCursor != null)
{
mCursor.moveToFirst();
recc=mCursor.getLong(0);
rec=String.valueOf(recc);
}
return rec;
}
我的数据库如下:
id heading Description
1 Congress countdown for 2014 polls: ghdfsfdghsdjfsdfhds
Possibility of UPA-III hinges on how other
但是它显示"Force to close
"错误:
我的Logcat如下:
My Logcat is as follows:
12-24 12:02:10.733: E/AndroidRuntime(22030): Uncaught handler: thread main exiting due to uncaught exception
12-24 12:02:10.804: E/AndroidRuntime(22030): android.database.sqlite.SQLiteException: near "countdown": syntax error: , while compiling: SELECT id FROM savedstoriestable WHERE heading=Congress countdown for 2014 polls: Possibility of UPA-III hinges on how other parties fare
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.database.sqlite.SQLiteProgram.native_compile(Native Method)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.database.sqlite.SQLiteProgram.compile(SQLiteProgram.java:110)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:49)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1221)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1194)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.newspaper.DBadapter.getid(DBadapter.java:104)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.newspaper.SavedStoriesActivity.onOptionsItemSelected(SavedStoriesActivity.java:72)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.app.Activity.onMenuItemSelected(Activity.java:2170)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:730)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:139)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:525)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.view.View.onTouchEvent(View.java:4179)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.widget.TextView.onTouchEvent(TextView.java:6541)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.view.View.dispatchTouchEvent(View.java:3709)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.os.Handler.dispatchMessage(Handler.java:99)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.os.Looper.loop(Looper.java:123)
12-24 12:02:10.804: E/AndroidRuntime(22030): at android.app.ActivityThread.main(ActivityThread.java:4363)
12-24 12:02:10.804: E/AndroidRuntime(22030): at java.lang.reflect.Method.invokeNative(Native Method)
12-24 12:02:10.804: E/AndroidRuntime(22030): at java.lang.reflect.Method.invoke(Method.java:521)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
12-24 12:02:10.804: E/AndroidRuntime(22030): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12-24 12:02:10.804: E/AndroidRuntime(22030): at dalvik.system.NativeStart.main(Native Method)
帮我解决这个问题.预先感谢.
Help me to solve this. Thanks in advance.
推荐答案
尝试一下:
Cursor mCursor = db.rawQuery(
"SELECT id FROM savedstoriestable WHERE heading= '"+heading+"'" , null);
标题是一个字符串.所以你必须把它放进''.
heading is a String. So you have to put it inside ''.
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