Android 对字段插槽0的错误请求,-1
我正在开发一个android数据库应用程序,并启动了类似这样的查询Android 对字段插槽0的错误请求,-1,android,sqlite,error-handling,Android,Sqlite,Error Handling,我正在开发一个android数据库应用程序,并启动了类似这样的查询 public Cursor strok(String holid, String gameId2) throws SQLException { // TODO Auto-generated method stub try{ abc = db.rawQuery("select MAX(strokeNo) from extended where
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;
}
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
在这样的活动中接受
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;
}
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
原木猫是
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它
abc = db.rawQuery("select MAX(strokeNo) from extended where "
+ " holeId = " + holid + " and " + " courseId = " + gameId2+";"
,null);
当谈到Sql中的where子句时,您应该知道字符串必须用“.”包围
abc = db.rawQuery("select MAX(strokeNo) from extended where "
+ " holeId = '" + holid + "' and " + " courseId = '" + gameId2+"';"
,null);
编辑:
在sql查询中,您只选择了一个字段,所以游标将只有一个字段
String maxs = cursor.getString(0);
我想我已经在你的代码中发现了问题。您正在使用
abc=db.rawQuery(“从扩展位置选择最大值(strokeNo)”
+“holeId=“+holid+”和“+”courseId=“+gameId2+”
,空);
}
和使用
cursor.getString(cursor.getColumnIndex(“strokeNo”))
以检索该值。但是在结果游标中没有这样的列strokeNo
应该使用cursor.getString(0)代码>取而代之。这应该行得通
还有另一个解决办法。您可以将查询更改为
abc=db.rawQuery(“从扩展的where中选择MAX(strokeNo)作为maxstroke”
+“holeId=“+holid+”和“+”courseId=“+gameId2+”
,空);
}
在检索时使用cursor.getString(cursor.getColumnIndex(“maxstroke”))
。我想这会解决你的问题。你看到你要求在数据库中有记录的查询了吗?我在logcat中打印了这个查询,并在命令提示符下启动了它。它工作正常03-20 12:33:26.207:I/System.out(13719):从扩展的where holeId=1和courseId=1中选择MAX(strokeNo);我想问的是,是否有符合您条件的记录?可能不存在包含您传递的holeid和courseid的Strokeno。该表中的值包含我传递的holeid和courseid