我正在开发一个 Android 数据库应用程序,并且已经触发了这样的查询
public Cursor strok(String holid, String gameId2) throws SQLException {
// TODO Auto-generated method stub
try{
abc = db.rawQuery("select MAX(strokeNo) from extended where "
+ " holeId = " + holid + " and " + " courseId = " + gameId2+";"
,null);
}
catch(Exception e)
{
Log.e("ERROR OF HOLE ID IS ", e.toString());
e.printStackTrace();
}
System.out.println("hello " + abc);
return abc;
}
并在这样的 Activity 中接收
Cursor cursor = db.strok(HoleIds.get(n),gameId);
System.out.println("after query ");
cursor.moveToFirst();
startManagingCursor(cursor);
System.out.println("the recived value is " +cursor);
String maxs = cursor.getString(cursor.getColumnIndex("strokeNo"));
System.out.println("the recived value is " +maxs);
but it is giving an error which i have not been able to find it out
日志猫是
03-20 11:43:43.396: E/CursorWindow(6138): Bad request for field slot 0,-1. numRows = 1, numColumns = 1
03-20 11:43:43.396: E/ERROR OF HOLE ID IS(6138): java.lang.IllegalStateException: get field slot from row 0 col -1 failed
03-20 11:43:43.396: W/System.err(6138): java.lang.IllegalStateException: get field slot from row 0 col -1 failed
03-20 11:43:43.526: W/System.err(6138): at android.database.CursorWindow.getString_native(Native Method)
03-20 11:43:43.526: W/System.err(6138): at android.database.CursorWindow.getString(CursorWindow.java:329)
03-20 11:43:43.526: W/System.err(6138): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:49)
03-20 11:43:43.526: W/System.err(6138): at golf.score.project.ExtendedScoreDisplay.onCreate(ExtendedScoreDisplay.java:123)
03-20 11:43:43.536: W/System.err(6138): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-20 11:43:43.556: W/System.err(6138): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
03-20 11:43:43.556: W/System.err(6138): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-20 11:43:43.556: W/System.err(6138): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-20 11:43:43.556: W/System.err(6138): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-20 11:43:43.567: W/System.err(6138): at android.os.Handler.dispatchMessage(Handler.java:99)
03-20 11:43:43.577: W/System.err(6138): at android.os.Looper.loop(Looper.java:123)
03-20 11:43:43.598: W/System.err(6138): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-20 11:43:43.598: W/System.err(6138): at java.lang.reflect.Method.invokeNative(Native Method)
03-20 11:43:43.606: W/System.err(6138): at java.lang.reflect.Method.invoke(Method.java:521)
03-20 11:43:43.606: W/System.err(6138): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-20 11:43:43.606: W/System.err(6138): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-20 11:43:43.606: W/System.err(6138): at dalvik.system.NativeStart.main(Native Method)
我想知道错误在哪里以及如何删除
最佳答案
abc = db.rawQuery("select MAX(strokeNo) from extended where "
+ " holeId = " + holid + " and " + " courseId = " + gameId2+";"
,null);
说到Sql中的where子句,你应该知道String必须被'包围。
abc = db.rawQuery("select MAX(strokeNo) from extended where "
+ " holeId = '" + holid + "' and " + " courseId = '" + gameId2+"';"
,null);
编辑:
就像在您的 sql 查询中一样,您只选择了一个字段,因此光标将只有一个字段
String maxs = cursor.getString(0);
关于android - 错误 字段槽 0、-1 的错误请求,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9782237/