Question

我尝试使用SQLite的MAX（）函数通过自定义ContentProvider的查询方法获取列的Max值，但是当我运行应用程序时崩溃，给我当前错误：

06-20 17：30：33.868 30109-30109 /？ E / AndroidRuntime：致命异常：主要处理：com.bpl.spart.bloodpressurelogbook，PID：30109 android.database.sqlite.SQLiteException：滥用聚合函数MAX（）（代码1）:,同时编译：SELECT _id，sistolica，diastolica，pulso FROM TablaTomasDePresion WHERE MAX（sistolica）在android.database.sqlite.SQLiteConnection.nativePrepareStatement（本机方法）在android.database.sqlite.SQLiteConnection.acquirePreparedStatement（SQLiteConnection.java:887）在android.database.sqlite.SQLiteConnection.prepare（SQLiteConnection.java:498）在android.database.sqlite.SQLiteSession.prepare（SQLiteSession.java:588）在android.database.sqlite.SQLiteProgram。（SQLiteProgram.java:58）在android.database.sqlite.SQLiteQuery。（SQLiteQuery.java:37）在android.database.sqlite.SQLiteDirectCursorDriver.query（SQLiteDirectCursorDriver.java:44）在android.database.sqlite.SQLiteDatabase.rawQueryWithFactory（SQLiteDatabase.java:1316）在android.database.sqlite.SQLiteDatabase.queryWithFactory（SQLiteDatabase.java:1163）在android.database.sqlite.SQLiteDatabase.query（SQLiteDatabase.java:1034）在android.database.sqlite.SQLiteDatabase.query（SQLiteDatabase.java:1202）在db.TomasProvider.query（TomasProvider.java:48）在android.content.ContentProvider.query（ContentProvider.java:1017）在android.content.ContentProvider $ Transport.query（ContentProvider.java:238）在android.content.ContentResolver.query（ContentResolver.java:491）在android.content.ContentResolver.query（ContentResolver.java:434）在com.bpl.spart.bloodpressurelogbook.pestanaGraficos $ 1.onItemSelected（pestanaGraficos.java:95）在android.widget.AdapterView.fireOnSelected（AdapterView.java:931）在android.widget.AdapterView.dispatchOnItemSelected（AdapterView.java:920）在android.widget.AdapterView.-wrap1（AdapterView.java）在android.widget.AdapterView $ SelectionNotifier.run（AdapterView.java:890）在android.os.Handler.handleCallback（Handler.java:746）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5459） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:728）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:618）

这是我调用方法的代码：

                   final String[] projection = {Contrato.Columnas._ID,Contrato.Columnas.SISTOLICA,Contrato.Columnas.DIASTOLICA,Contrato.Columnas.PULSO};
                    final String select  = "MAX(" + Contrato.Columnas.SISTOLICA + ")";

                    Cursor c = resolver.query(Contrato.URI_CONTENIDO_BASE,projection,select,null,null);

                    if(c.moveToNext()){
                        String sisq = c.getString(c.getColumnIndex(Contrato.Columnas.SISTOLICA));
                        sistolicaMAQ.setText(sisq);

                        String diaq = c.getString(c.getColumnIndex(Contrato.Columnas.DIASTOLICA));
                        diastolicaMAQ.setText(diaq);

                        String pulq = c.getString(c.getColumnIndex(Contrato.Columnas.PULSO));
                        pulsoMAQ.setText(pulq);
                    }

所以，问题是如何纠正这个错误？

滥用ContentResolver

0 个答案: