取決於數據庫信息是SQLite Android

Question

我爲學生開發了一個應用程序，允許他們訪問模塊的詳細信息，如時間和日期。

爲此，我有一個方法在我的DB.Java中查詢數據庫並選擇模塊的名稱和時間WHERE當天等於當天。像這樣：

public List<tableModules> getModuleTime(String module1, String module2, String module3, String day) { 
     List<tableModules> moduleList = new ArrayList<tableModules>(); 
     // Select All Query  
     SQLiteDatabase db = this.getWritableDatabase(); 
     Cursor cursor = db.rawQuery("SELECT modulename, modulelecturetime, moduleseminartime FROM " + Table2 + " WHERE modulename=? OR modulename=? OR modulename=? AND WHERE modulelecturedate=? OR moduleseminardate=?", new String[]{module1, module2, module3, day, day}); 
     // looping through all rows and adding to list 
     if (cursor.moveToFirst()) { 
      do { 
       tableModules module = new tableModules(); 
       module.modulename = cursor.getString(1); 
       module.modulelecturedate = cursor.getString(2); 
       module.moduleseminardate = cursor.getString(3); 
       moduleList.add(module); 
      } while (cursor.moveToNext()); 
     } 
     // return module times 
     return moduleList;  
    } 

我在MainActivity.Java稱之爲 - 所有我想要它做的是什麼顯示器講座/研討會的學生都有，這些模塊在學生表，然後他們用來匹配的發現數據庫確定什麼時間，然後顯示。 - 不幸的是程序停止，LogCat顯示在最下面。

List<tableStudents> studentModules = db.getStudentsModules(sessionName);    
      for (tableStudents session: studentModules) 
      { 
       //Save modules to string 
       String module1 = session.modules.toString(); 
       String module2 = session.modules1.toString(); 
       String module3 = session.modules2.toString();   
       String today = getCurrentDay().toString();   
        Toast.makeText(MainActivity.this, "Today is: " + today, Toast.LENGTH_LONG).show(); 
       TextView event1 = (TextView)findViewById(R.id.event1); 
       event1.setText(today + "'s Events:"); 
       List<tableModules> moduleDayList = db.getModuleTime(module1, module2, module3, today); 
        for (tableModules module: moduleDayList) {      

        if(!module.modulelecturedate.isEmpty()) 
        {      
          event1.setText("Your Lecture for" + module.modulename.toString() + "is at" + module.modulelecturetime.toString()); 
         }     
         if (!module.moduleseminardate.isEmpty()) 
         {     
          event1.setText("Your Seminar for" + module.modulename.toString() + "is at" + module.moduleseminartime.toString()); 
         } 

        } 

      } 

的logcat：

03-08 19:29:23.823: E/AndroidRuntime(1852):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
03-08 19:29:23.823: E/AndroidRuntime(1852): Caused by: android.database.sqlite.SQLiteException: near "WHERE": syntax error (code 1): , while compiling: SELECT modulename, modulelecturetime, moduleseminartime FROM Modules WHERE modulename=? OR modulename=? OR modulename=? AND WHERE modulelecturedate=? OR moduleseminardate=? 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1255) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at com.example.project.DB.getModuleTime(DB.java:134) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at com.example.project.MainActivity.onResume(MainActivity.java:111) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1257) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.app.Activity.performResume(Activity.java:6076) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2978) 
03-08 19:29:23.823: E/AndroidRuntime(1852):  ... 11 more 

Answer 1

你有一個SQL語句，這不是有效的SQL 2項WHERE條款。

之一，在WHERE modulename=? OR modulename=?....和另一AND WHERE modulelecturedate=? OR..........

我怎麼能解決這個在一個SQL語句？

如果您希望將其作爲單個SQL語句，請使用括號並刪除第二個WHERE子句。示例WHERE (modulename=? OR modulename=?....)AND (modulelecturedate=? OR..........)