從SQLITE DB獲取值時出錯

我有一個SQLite數據庫，我需要從中獲取一些值。我需要獲取經緯度來在地圖上放置一個地理點，但是我收到了一個錯誤。這是我的logcat：從SQLITE DB獲取值時出錯

05-07 14:17:52.811 10811-10811/? E/AndroidRuntime: FATAL EXCEPTION: main 
Process: com.disasternew, PID: 10811 
android.database.sqlite.SQLiteException: near "SELECT": syntax error (code 1): , while compiling: SELECT shelter_id, title, desc, lat, long, route, capacity, current_load FROM Shelter WHERE SELECT title,desc,lat,long,route,capacity,current_load from Shelter 
     at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
     at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:898) 
     at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:509) 
     at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
     at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
     at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37) 
     at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44) 
     at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1346) 
     at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1193) 
     at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1064) 
     at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1270) 
     at com.disasternew.MainActivity.doSearch(MainActivity.java:117) 
     at com.disasternew.MainActivity$1.onClick(MainActivity.java:93) 
     at android.view.View.performClick(View.java:4848) 
     at android.view.View$PerformClick.run(View.java:20262) 
     at android.os.Handler.handleCallback(Handler.java:815) 
     at android.os.Handler.dispatchMessage(Handler.java:104) 
     at android.os.Looper.loop(Looper.java:194) 
     at android.app.ActivityThread.main(ActivityThread.java:5637) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

查詢代碼：

String querySelect = "SELECT title,desc,lat,long,route,capacity,current_load from Shelter"; 
Log.e("test", "-----" + querySelect); 
Cursor locationCursor = database.query("Shelter", new String[]{"shelter_id","title", "desc", "lat", "long","route","capacity","current_load"},querySelect, null, null, 
     null, null, null); 
locationCursor.moveToFirst(); 
Log.e("test", querySelect); 
while (locationCursor.moveToNext()) { 
    String title = locationCursor.getString(locationCursor.getColumnIndex("title")); 
    String desc = locationCursor.getString(locationCursor.getColumnIndex("desc")); 
    lattitude_shelter = (int) (locationCursor.getFloat(locationCursor.getColumnIndex("lat")) * 1E6); 
    longitude_shelter = (int) (locationCursor.getFloat(locationCursor.getColumnIndex("long")) * 1E6); 
}

創建表：

public void onCreate(SQLiteDatabase db) { 
    String CREATE_SHELTER_TABLE = "Create table Shelter("+ 
      " shelter_id INTEGER AUTO INCREMENT PRIMARY KEY, "+ 
      " title TEXT ,"+ 
      " desc TEXT, "+ 
      " lat Float,"+ 
      " long Float ,"+ 
      " route TEXT ,"+ 
      " capacity INT,"+ 
      " current_load INT)"; 

    db.execSQL(CREATE_SHELTER_TABLE); 
    db.execSQL(" INSERT INTO Shelter VALUES(1,'College More','Salt Lake',22.57,88.43,'Open',10,5);"); 
    db.execSQL(" INSERT INTO Shelter VALUES(2,'Salt Lake Stadium','Salt Lake',22.56,88.40,'Open',10,8);"); 
    db.execSQL(" INSERT INTO Shelter VALUES(3,'College More','Salt Lake',22.56,88.40,'Full',10,10);"); 
}

來源

2017-05-07 Payal Garg

我猜你的'querySelect'是錯誤的。 query方法的第三個參數必須是WHERE子句（沒有WHERE本身），在那裏你定義了哪些行應該返回以及爲什麼。例如，你說：給我所有標題爲College More的行。然後它是這樣的：'String whereClause =「title =？」'然後在args中傳遞你正在搜索的值：'String [] whereArgs = new String [] { 「College More」} – Opiatefuchs

@Opiatefuchs我沒有在這裏使用where子句。我希望所有的行沒有任何過濾，並且從內置的SQLITEDatabase.class中使用的方法是public Cursor query（String table，String [] columns，String selection，String [] selectionArgs ，String groupBy，String having，String orderBy，String limit）{newThreadEvent（「Stub！」）; } –

@Opiatefuchs我也試過rawquery，然後顯示「android.database.sqlite.SQLiteException：沒有這樣的列：拉特（代碼1）：，而編譯：SELECT title，desc，lat，long，route，capacity，current_load FROM Shelter「 –

這是你的問題，如果第一線，你選擇「的稱號，遞減，緯度，經度，路線，容量，current_load「，但在查詢中添加」shelter_id「：

String querySelect = "SELECT title,desc,lat,long,route,capacity,current_load from Shelter"; 

    Log.e("test", "-----" + querySelect); 
    Cursor locationCursor = database.query("Shelter", new String[]{"shelter_id","title", "desc", "lat", "long","route","capacity","current_load"},querySelect, null, null,

所以請將「shelter_id」添加到querySelect並重試！ :)

快樂編碼！ :)

來源

2017-05-07 09:25:55 MilanNz

大家好。感謝您的幫助，但我已經對問題進行了排序。我所做的只是打破了不同字符串中的select語句，也許是一些括號或逗號問題。感謝大家 –

@PayalGarg很好！祝你今天愉快：） – MilanNz

感謝烏拉圭回合的幫助，但我已經排序的issue.What我所做的是剛剛突破不同串中的select語句和concatening它worked.Maybe是一些支架或逗號issue.Thanks大家

來源

2017-05-09 16:42:07

從SQLITE DB獲取值時出錯

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